Chemistry Flashcards
(397 cards)
1
Q
What particles are found in the nuclues of an atom?
A
Proton and neutrons
2
Q
What is the negatively chraged particles of an atom?
A
Electron
3
Q
What is the charge of an electron in charge unit?
A
1-
4
Q
What is the charge of an electron in coulomb?
A
-1.602176462x10^-19
5
Q
What is the unit for a charge of a particle?
A
Charge unit
6
Q
What is the common unit used to indicate the mass of a particle?
A
Atomic mass unit (amu)
7
Q
The discovery of radioactivity further confirms the existence of subatomic prticles. Who discovered radioactivity?
A
Henri Becquerel
8
Q
How does Joseph John Thomson call his model of the atom?
A
Plum-pudding model
9
Q
Who revised the atomic thery by replacing the hard, indestructible spheres imagined by Dalton and proposed the “raisin bread model”of the atom?
A
Joseph John Thomson
10
Q
Who formulated the atomic theory?
A
John Dalton
11
Q
“The masses of elements in a pure compound are always in the same proportion.” This statement is known as.
A
Law of definite proportion
12
Q
“When two or more elements form more than one compound, the ratio of the masses of one element that combine with a given mass of another element in the different compounds is a ratio of small whole numbers.” This statement is known as:
A
Law of multiple proportion
13
Q
Which of the following is NOT an extensive property of a material?
Length; Volume; Density; Weight
A
Density
14
Q
Which of the following is NOT an intensive property of a material?
Color;Surface area;Melting point; Taste
A
Surface area
15
Q
The properties of a material that do not change when the amount of substance changes is called _____ properties.
A
Intensive
16
Q
The properties of a material that also change when the amount of subtance changes is called _______ properties.
A
Extensive
17
Q
A material is said to be ________ if its composition and properties are not uniform throughout.
A
Heterogeneous
18
Q
A material is said to be _________ if its composition and properties are uniform throughout.
A
Homogeneous
19
Q
What is another term for “chemical change”?
A
Chemical reaction
20
Q
What occurs when a substance changes in appearance without changing its compositions?
A
Physical change
21
Q
What occurs when a substance is transformed into onther substance with a totally different composition and properties?
A
Chemical change
22
Q
Table salt or sodium chloride may be formed by the reaction of:
A
Hydrochloric acid and sodium hydroxide
23
Q
What acid is added to carbonated drinks to produce a tart test?
A
Phosphoric acid
24
Q
Vinegar is a solution of water and what kind of acid?
A
Acetic acid
25
An acid can react with base to produce a
Salt
26
Which of the following is NOT a property of bases?
Fell slippery on the skin.; Turn litmus paper to blue.; taste bitter.; Dissolve metals producing various slats and hydrogen gas.
Dissolve metals producing various slats and hydrogen gas.
27
Which of the following is NOT a property of acids?
Taste sour.; Feel slippery on the skin.; Turn litmus paper to red.; Dissolve metals producing various salts and hydrogen gas.
Feel slippery on the skin
28
What are elements that have properties intermediate between metals and nonmetals?
Metalloids
29
Which of the following is NOT a property of metals?
Metals are neither malleable nor ductile; Metals have high thermal conductivity.; Metals have high electrical conductivity.; Metals have more luster
Metals are neither malleable nor ductile.
30
What is the property of metals that makes them reflect the light that strikes their surfaces, making them appear shiny?
Luster
31
What is the property that allows metal to be rolled without breaking?
Malleability
32
Compounds are mostly classified as:
Acids and Bases
33
What are the three states of matter?
Solid, Liquid and Gas
34
How are elements classified?
Metals, Nonmetals or metalloids
35
The particles of sugar dispered in water are so small that a clear homogeneous mixture is formed. What is this homogeneous mixture called?
Solution
35
A very fine particles of soil when mixed to water will form a cloudy mixture
Colloid
36
The mixture of soil and water is an example of what classificaton of a mixture?
Suspension
37
How are mixtures classified?
Suspension,Colloids or Solution
38
What is the result from the combination, in definte proportion of mass, of two or more elements?
Compound
39
What is a substance that cannot be broken down into simpler substances?
Element
40
How are substances classified?
Elements or Compounds
41
All forms of matter are composed of the same building blocks called?
Atoms
42
What is anything occupies space and has mass?
Matter
43
Who discovered the neutron?
James Chadwick
44
Who discovered the proton?
Ernest Ruther ford
45
Who was the fisrt person to propose that atoms have weights?
John dalton
46
The word "atom" comes from Greek "atomos" which means what?
Indivisible
47
What is the particle of an atom that has no electrical chrage?
Neutron
48
What is the positively chraged particle of an atom?
Proton
49
What is the charge of a proton in coulombs?
+1.602176462x10^-19
50
What is the chrage of a proton in charge unit?
1+
51
What is the mass of an electron in gram?
9.109387x10^-28
52
What is the mass of an electron in amu?
5.485799x10^-4
53
What is the mass of a proton in gram?
1.672623x10^-24
54
What is the mass of proton in amu?
1.0072765
55
What is the mass of a neutron in grams?
1.67495x10^-24
56
What is the mass of a neutron in amu?
1.00866
57
The protons and neutrons are not considered are fundamental particles because they consist of a smaller particles called
Quarks
58
The atomic number of an element is:
The number of protons in the nucleus
59
Atoms of the same element which have different masses are called
isotopes
60
What is an atom of specific isotopes called?
Ion
61
The number of _______ in an atom defines what element the atom is.
Protons
62
The number of ______ in an atom defines the isotopes of an elements.
Neutrons
63
If electrons are removed from or added to a neutral atom, a charged particle of the same element, called ______ is formed.
ion
64
A negativelu charged ion which results when an electron is added to an atom called
anion
65
A postively charged ion which results when an electron is removed from an atom is called
cation
66
What is "identity number" of an atom?
Atomic number
67
The ______ of an atom is the sum of the number of protons and neutrons in the nucleus of an atom.
mass number
68
"When the elements are arranged in the order of increasing atomic number elemnets with similar properties appear at periodic intervals." This statement is known as
The periodic law
69
Who are the two chemists creadited for the discovery of the periodic law?
Juluis lother meyer and Demitri vanovich mendeleev
70
The elements with similar properties are placed in columns of the periodic table. These columns are common called
Groups or families
71
What are the rows in the periodic table called?
Periods
72
Elements in Group 1A in the periodic table are
Akali metals
73
Elements in Group IIA in the periodic table are
Alkaline earth metals
74
The boron group is what group in the periodic table?
GroupIIIA
75
What group in the periodic table is the carbon group?
Group IVA
76
What group in the periodic table is the nitrogen group?
Group VA
77
The chalcogens are elements in what group in the periodic table?
Group VIA
78
Halogens belong to what group in the periodic table?
Group VIIA
79
The elements, germanium and silicon, which are commonly used for semiconductors belongs what group of elements?
Carbon group
80
What group in the periodic table are the noble gases?
Group 0 or VIII A
81
Which of the following is NOT a noble gas?
Antimony
82
What is the atomic number for oxgen?
8
83
What is the atomic number of carbon?
6
84
Which alkaline earth metal has the smallest atomic number?
Beryllium
85
Which noble gas has the smallest atomic number?
Helium
86
What is the most abundant element in terms of the number of atoms?
Oxygen
87
What is the most abundant element in the human body?
Oxygen
88
What is the second most abundant element in the human body?
Carbon
89
Which of the following is NOT a metalloid?
Magnesium
90
Caustic soda is used in making soap, textiles and paper. What is another term for caustic soda?
Sodium hydroxide
91
What is used for the manufacture of explosives and fireworks?
Potassium perchlorate
92
All alkaline metals will tarnish in air except?
Beryllium
93
What is element is used as a coatin for iron to make galvanized iron a corrosion-resistant material?
Zinc
93
What element is used as electric power source for pacemakers and atrificial hearts?
Promethium
94
What element is commonly used in making lasers?
Neodymium
95
What is regarded as the most unique element in the periodic table?
Carbon
96
What is the most abundant element in the atmosphere?
Nitrogen
97
What is the only gas in Group VIA in the periodic table?
Oxygen
98
What is the second most abundant element in the atmosphere?
Oxygen
99
what element is used in advetising signs?
neon
100
What principle states about the fundamental limitation that, for a particle as small as the electron, one cannot know exactly where it is and at the same time know its energy or how it is moving?
Uncertainty principle
101
Who discovered the uncertainty principle?
Werner Karl heisenberg
102
what principle states that the electron full the orbitals, one at a time starting with the lowest orbital then proceeding to the one with higher energy?
Aufbau principle
103
What principle states that no two electrons in the same atom can have the same set of four quantum numbers?
Pauli exclusion principle
104
What describes how the electrons and distributed among the orbitals?
Electron configuration of an atom
105
The _________ of the atom describes the atom as having a cuvleus at the center around which electrons move?
Quantum mechanical model
106
What are the main energy levels where the valence electrons belong called?
Valence shells
107
The elements of groups IA,IIA,IIIA,IVA,VA,VIA.VIIA, and VIIIA are called main group elements or
Representatives
108
For the representative elements, the number of valence electrons is the same as the
The rightmost digit of the group number of the element
109
For transition elements, the number of valence electron is the same as
the group number
110
The size of the atom is dependent on which of the following:
The region of space occupied by its electrons
111
What happens to the atomic size of the elements in a group when you go from top to bottom of the grooup? It
increases
112
Who first predicted the bose-Einstein condensate (BEC) in 1924?
Albert einstein
113
The ionzation energy is ________ to the atomic size of atom.
Inversely proportional
114
What refers to the measure of the atom's tendency to attract an additional electron?
Electron affinity
115
The process of aining or losin an electron results to the formation of a charged atom or molecule called
ion
116
Aside from liquid,gas and solid, there are two other state of matter.
Plasma and Bose-einstein Condensate
117
Who fist identified plasma in 1879?
William crookes
118
Who coined the term plasma in 1928
Irving langmuir
119
What is made of gas atoms that have been cooled to near absolute zero at which temperature the atoms slow down, combine and forms a single entity known called a superatom?
Bose-Einstein condensate (BEC)
120
The fifth state of matter, the BEC(Bose-Einstein condensate) was first created in what year?
1995
121
What is a high-energy,electrically charged gas produced by heatin the gas unit the electrons in the outer orbitals of the atoms separte, leaving the atoms with a positive charge?
Plasma
122
Water has bigger density when it is in what state?
Liquid
123
What is the temperature of water in solid state of 1 atm?
O degree celcuis
124
The density of water is the largest at what temperature?
4 degree celcuis
125
What element has a very high melting point and ideal for filaments of light bulbs?
Tungsten
126
Metals can be drawn into wires. This illustrates what property of metals
ductility
127
Steel is the widely used construction material because of its high tensile strength. It is a combination of what element?
Iron and carbon
128
What refers to the electro static attraction that holds together the oppositly charged ions, the carbons and anions, in the solid compound?
Ionic bond
129
What states that atoms tend to gain, lose or share electrons until they are surrounded by eight valence electrons?
Octet rule
130
What indicated the number of valence electrons to the atom represented by dots scattered on four sides of the atomic symbol?
Electron dot structure or lewis structure
130
What is formed by sharing of electrons between atom?
Covalent bond
131
What is the distance between the nuclei of two bonded atoms called?
Bond length
132
The overall shape of a molecule os described by which two properties?
Bond distance and bond angle
133
What is an angle made by the lines joining the nuclei of the atoms in the molecule?
Bond angle
134
"The best arrangement of a given number of shared and unshared electrons is the one hat mnimizes the repulsion among them". This is known as
Valence-shell electron-pair repulsion theory
135
"A covalent bond is formed by the overlap of atomic orbitals." This statement is the basic idea of which theory?
Valence bond theory
136
What refers to the ability of an atom in a molecule to attract shared electrons?
Electronegativity
137
What type of bond occurs when the difference in electronegativity is greater than or equal to 2?
Ionic
138
When can we say that a molecule is polar?
When the center of positive and negative charge do not coincide
139
Nobpolar covalent bond occurs if the difference in electronegativity ranges from:
.50 to 1.90
140
What is the sum of the masses of the atoms in the molecule of the substance called?
Molecular mass
141
What refers to the number of atoms in exactly 12 grmas of carbon-12?
Avogdro's number
142
Which one is the avogadro's number?
6.02x0^23
143
What is defined as the amount of substance that contains 6.02x10^23 particles of that substance?
Mole
144
What refers to the mass in grams of one mole of a substance?
Molar mass
145
What is the unit of molar mass?
Grams per mole
146
The total pressure of a mixture of gasses equals the sum of the partial pressures of each of the gasses in the mixture".
This statement is known as
Dalton's law of partial pressure
147
The dry air is composed of how many percent nitrogen?
78.1%
147
The dry air is composed of how many oxgen?
20.9%
148
How much carbon dioxide is present in dry air?
0.03%
148
What is the mixing of gases due to molecular motion called?
Diffusion
149
What refers to the passage of molecules of a gas from one container to another through a tiny opening between the containers?
Effusion
150
The rate of effusion of a gas is inversely proportional to the square root of its molar mass. Who discovered this?
Thomas Graham
151
What law states that the rate of effusion of a gas, which is the amount of gas that through the hole in a given amount of time, is inversely proportional to the square root of its molar mass?
Graham's law of effusion
152
What is a poisonous gas generated mostly by motor vehicles?
Carbon monoxide
153
What is considered as one of the pollutants responsible for smog and acid rain?
Nitrogen dioxide
154
What refers to the forces of attraction that exist between molecules in a compound?
Intermolecular forces
155
All are basic types of van der waals forces except one. Which one?
Dipole-dipole interaction; London dispersion forces; Heat bonding; Hydrogen bonding
Heat Bonding
156
The three types of intermolecular forces exist in neutral molecules are collectively known as van der Waals forces. This named after
Diderick van der waals
157
A dipole has how many electrically charged pole(s)?
2
158
Compounds containgin hydrogen and other element are known as
Hydrides
159
What is a special kind of dipole-dipole interaction formed when a hydrogen atom bonded toa highlyy electronegative atom is attracted to the lone pair of a nearby electronegative atom?
Hydrogen bond
160
What is the process of changing from gas state to liquid state?
Condensation
161
What is the process of changing from liquid state to solid state?
Freezing
162
What is the process of changing from solid state to gas state?
Sublimation
163
What is the process of changing from gas state to solid state?
Deposition
164
What is the process of changing from solid state to liquid state?
Melting
165
What refers to the amount of heat absorbed by one mole of substance to change from solid to liquid?
Molar heat of fusion
166
What refers to the amount of heat absorbed by one mole of substance to change from liquid to solid?
Molar heat of fusion
167
What refers to the amount of heat required by one mole of a substance to change from liquid to gas?
Molar heat of vaporization
168
What refers to the amount of heat required by one mole of a substance to change from gas to liquid?
Molar heat of condensation
169
Liquid that vaporizes easily are called _______ liquids.
Volatile
170
What refers to the temperature above which a gas cannot be liquefied by an increase in pressure?
Critical temperature
171
What is a homogeneous mixture made of particles that exist as individual molecules or ions?
Solution
172
What is the component of a solution that is dissolved?
solute
173
What is the component of the solution in which the solute is dissolved?
Solvent
174
Bronze is a solid solution of copper and tin. which of the following is true?
Tin is a solvent; Copper is a solute; Copper is the solvent; The solution is called aqueous solution
Copper is the solvent
175
When the solvent of the solution is water, it is a/an ________ solution.
Aqueous
176
What is the most common solvent in medicines?
ethanol
177
What is the term generally used to describe the combination of solute molecules or ions with solvent molecules?
Solvation
178
What is the term used to describe the maximum amount of solute that a siven solvent can dissolve to give a stable solution at a given temperature?
Solubility
179
When the maximum amount of solute is dissolved in the given solvent at a stated temperature, this solution formed is
Saturated
180
When the maximum amount of solute is dissolved in the given solvent at a stated temperature, this solution formed is
Saturated
181
When the solution contains less solute particles than the maximum amount the solvent can dissolve at that temperature, the solution is
unsaturated
182
When the solution contains more solute particles than the solvent can normally hold, the solution is
Supersaturated
183
What is the most common solution on earth?
Seawater
184
Solution composed of two or more metals are called
alloys
185
The solubility of a substance in another substance is affected by the following factors except
Volume
186
Liquids that do not mix are said to be
immiscible
187
How will an increase in temperature in solids affect the solubility?
It will cause an increase in solubility
188
How will an increase in temperature of gases dissolving in liquids affect the solubility?
It will cause a decrease in solubility
189
How does pressure affects the solubility of gases in liquids?
IT increases solubility
190
How does pressure affect the solubility in liquids or of liquids in another liquids?
It slightly affects solubility
190
How does pressure affect the solubility in liquids or of liquids in another liquids?
It slightly affects solubility
191
The Solubility of a gas in liquid is directly proportional to the partial pressure of the gas above the solution"
This is known as
Henry's law
192
Who discover the electron
Joseph john thomson
193
What refers to the measure of how fast a substance dissolves?
Rate of dissilution
194
How can the rate of dissolution be increased?
Reduce particles size; Agitaion; Application of heat
All of the above
195
________ means there is only a little amount of solute dissolved in a solution.
Dilute
196
________ means there is a large amount of solute dissolved in the solution.
Concentrated
197
What is the ratio of the number of moles of one component of a solution to the total number of moles of all the components?
Mole fraction
198
What is the ratio of the number of moles of solute to the volume of the solution in liter?
Molarity
199
What is the ratio of the number of moles of solute per kilogram of solvent?
Molality
200
What is the process of makin a solution less concentrated as in the addition of more solvent?
Dilution
201
What is the process of changing liquid to gas that is usually accompanied by the production of the bubbles of vapor in the liquid?
Boiling
202
What is the temperature at which the vapor pressure of the liquid equals the prevailing atomospheric pressure?
Boiling point
203
What is the temperature at which liquid and solid are in equilibrium?
Freezing point
204
What refers to the decrease in the freezing point of a pure liquid when another substance is dissolved in the liquid?
Freezing point depression
205
If two solutions have the same concentration of solute, they are
isotonic
206
If one of the two solutions has a bigger concentration of solute particles than the other, the one with the higher concentration is described as
Hypertonic
207
IF one of the two solutions has a bigger concentration of solute particles than the other, the one with the lower concentration is described as
Hypotonic
208
The movement of solvent particles through a semi-permeable membrane from the region lower solute concentration to the region of higher solute concentration is called
Osmosis
209
The term "colloid" comes from the GReek "kolla" and "oidos" which means
Glue appearance
210
What are suspensions of liquid or solid particles in a gas called?
Aerosols
211
What is some aerosol products that can cause harm to the atomsphere?
Chlorofluorocarbons (CFC)
212
What are colloidal dispersion of gas bubbles in liquids or solids?
Foams
212
What is colloidal dispersion of a liquid in either a liquid or a solid?
Emulsions
213
What is a solid dispersed in either a solid or a liquid?
Sols
214
What is a colloidal system in which the dispersed phase consists of fibrous interwoven particles called fibrils which exert a marked effect on the physical properties of the dispersing medium
Gels
215
Most cosmetics and ointments and creams used in medicines are
Emulsions
216
The substance usually used in cleaning toilets bowls and tiles is muriatic acid. What is another term for this?
Hydrochloric acid
217
"Upon dissociation in water, acids yield hydrogen ions while gases yield hydroxide ions." What is this statement commonly called?
Arrhenius theory
218
What is defined as a substance which, upon reaction with water causes an increase in the concentration of the solvent cation, H3O+
Arrhenius acid
219
What is the dissolution constant of water at 25 degree celcuis
1.8x10^-16
220
What theory states that an acid in any substance that donates a proton to anothe substance, and a base is any substance that can accept a proton from any other substance
Bronsted-Lowry theory
221
What theory states that an acid is a substance that can accept a lone pair from another molecule, and a base is a substance that has a lone pari of electrons
Lewis theory
222
An acid described as an electron pair acceptor is the ______ acid.
Lewis
223
The Bronsted-Lowry acid is:
A proton donor
224
The Bronsted-lowry base is:
Proton acceptor
225
According to Gilbert Lewis, an acid-base reaction as the sharing of an electron pair will form what type of bond?
Coordinate covalent bond
226
What is the type of covalent bond in which the shared electrons are donated by one, not both, of the involved?
Coordinated covalent bond
227
What is the term used for the product of a Lewis acid-base reaction?
Adduct
228
Acids composed of only two element;hydrogen and nonmetal are called?
Binary acids
229
What is added to hydrochloride to form hydrochloric acid?
Water
230
Acid consist of three elements; hydrogen nad two nonmetals are called
Ternary acids
231
AIF one of the two nonmetals of a ternary acid is oxygen, the acid called
Oxyacid
232
Which of the following is the formula of suluric acid?
H2SO4
233
Which of the following is the formula of nitric acid?
HNO3
234
What acid is usually used in vinegars?
Acetic acid
235
What acid is used in glass itching?
hydrochloric acid
236
What acid is usually present in some fruit?
Citric acid
237
What acid is used in carbonated drinks?
Carbonic acid
238
What acid usually used to reduce pain nad inflammation such as aspirin and other pain relievers?
Acetylsalicylic acid
239
What acid is usually used in the manufaacture of fertilizers?
Phosphoric acid
240
What acid is usully used in the manufacture of explosive?
Nitric acid
241
What is the atomic number of germanium
32
242
What alkali metal is usually used for x-ray apparatus because of its ability to allow x-rays to pass through with minimumbabsorption
Beryllium
243
What acid is used in the batteries of cars or automobiles
Sulfuric acid
244
Bases are compounds consisting of:
metal and hydroxide ion
245
Which base is used to remove carbon dioxide from air?
Lithium hydroxide
246
What base is used as an antacid with no dosage restriction?
Magnesium hydoxide
247
Magnesium hydroxide is a base used as antacid if consumed in small amounts and laxative if consumed in large dosage.What is common term for magnesium hydroxide?
Milk of Magnesia
248
What is the most convenient way of expressing hydronium ion concentration?
pH scale
249
What is the most convenient way of expressing hydronium ion concentration?
pH scale
250
Who proposed the pH scale in 1909?
Soren Sorensen
251
What does the symbol pH stand for?
The power of the hydrogen ion
252
What is the pH of pure water
7
253
Which two substance have the same pH, which is 6.5?
Saliva and Milk
254
Which is the best description of strong acids?
They dossociate or ionize completely in water
255
Which is the best description of weak acids?
They don't dissociate or ionize completely in water
256
What is a measure of the H3O+ concentration of a solution?
pH
257
What is a measure of the OH- concentration of a solution?
pOH
258
What is the pH of a neutral solution?
7
259
Which of the following pH is the most basic?
pH 13
260
What is the substance that changes color at a certain pH range?
Indicator
261
What refers to the reaction between an acid and a base forming slat and water?
Neutralization
262
What is the process of measuring the concentration of an acid or base in one solution by adding a base or acid solution of known concentration until the acid or base in the solution of unknown ocncentration is fully neutralized?
Titration
263
What refers to the point at which the added base or aacid solution in titration is enough to fully neutralize the acid or base?
Equivalence point
264
What refers to the reaction between the ions of a slat and the ions of water?
Salt buffering
265
What is a solution consisting of a weak acid and its conjugate base, or of a weak base and its conjugate aid?
Buffer
266
What is the most common chemical raecntion, which is the reaction of material with oxygen accompanied by the giving off of energy in the form of heat
Combustion
267
What is the area of chemistry that concerns with the rate at which chemical reaction occur?
Chemical kinetics
268
What is the minimum amount of energy need for a chemical reaction to occur called?
Activation energy
269
If the energy is released as the reaction occurs, it is a ______ reaction.
Exothermic
270
If the energy is absorbed during the reaction, it is a _________ reaction.
Endothermic
271
What is a substance that, when added to a reaction mixture, increases the rate of the reaction but is itself unchanged after the reaction is done?
Catalyst
272
What is a susbstance that slows down a chemical reaction?
Inhibitors
273
How are catalysts classified?
Homogeneous and heterogeneous
274
What type of catalyst exists in the same phase as the reactants in a reaction mixture?
Homogeneous catalyst
275
What type of catalyst exists in separate phase as the reactant in the reaction mixture?
Heterogeneous catalyst
276
Most heterogeneous catalyst are
solids
277
Which one is a factor that affects the rate of chemical reactions?
Temperature; Concentration and surface area of reactants; presence of catalyst
All of the above
278
What refers to the state at which the rates of the forward and backward reaction are equal?
Chemical equilibrium
279
What is the ratio of the equilibrium concentration of the products to the equilibrium concentration reactants with each species concenttration raised to the corresponding stoichiometric coefficient found in the balanced reactio?
Equilibrium constant
280
What term is used as a qualitative description of the extent of a chemical reaction?
Equilibrium position
281
What quantity is used to determine how far from equilibrium the chemical reaction is?
Reaction quotient
282
What states that if a change in conditions is imposed on a system at equilibrium, the quilibrium position will shift in the direction that tends to reduce the effects of that change?
Le chatelier's principle
283
What refers to the reaction of oxygen with an element or compound?
Oxidation
284
The gain of electron by a substance is known as
Reduction
285
What represents the charge that the atom would have if the electrons in each bond belonged entirely to the more electronegative atom?
Oxidation number
286
A reduced susbtance is waht type of agent?
Oxidizing agent
287
The oxidized substance is what type agent?
Reducing agent
288
What reaction does not involve any change in oxidation number?
Nonredox reaction
289
What is an apparatus that uses a spontaneous redox reaction to generates electricity?
Voltaic cell
290
Whaat is a branch of chemistry whihc is the study of carbon-containing molecules known as organic compounds?
Organic chemistry
291
Which of the following is a crystalline form of carbon?
Diamond; Graphite; Fullerenes
All of the above
292
What crystalline crabon is soft,black slippery that possess metallic luster and conduct electricity
Graphite
293
What is formed when hydrocarbons such as methane are heated in the presence of very little oxygen?
Carbon black
294
What type of carbon is produced when wood is heated intensely in the absence of air?
Charcaol
295
What type of carbon is used to remove undesirable odors from air?
Charcoal
296
What type of carbon is used to remove undesirable odors from air?
Charcoal
297
What carbon is produced when coal is strongly heated in the absence of air?
Coke
298
What type of carbon is used in the manufacture of car tires?
Carbon black
299
Which of the following is NOT a property of inorganic compounds?
Usually flammable and combustible
300
Organic compounds:
Are generally soluble in non-polar system
Are usually flammable and combustible
Have presence of covalent bond
301
Inorganic compunds:
Are generally soluble in non-polar solvents
Are generally non flammble
Have presence of ionic bond
302
The organic compounds are related to each other by a common feature involving a certain arrangement of atoms called
Functional groups
303
What is the simplest and most commonly encountered class of organic compounds?
Hydrocarbons
304
Based on the type of bond existing between two carbon atoms, how are hydrocarbons classified?
Saturated and unsaturated
305
What hydrocarbons contain only single bonds?
Alkanes
306
WHen hydrocarbon consists of carbon links that form a long, straight or branched chain, it is classified as ______ type.
Chain
307
When hydrocarbon consists of carbon links that form a ring, it is classified a _______ type.
Cyclic
308
The aromatic hydrocarbons contain the structural unit called?
Benzene
309
What is a six-carbon ring with three alternating double bonds, or closely related rings or rings of similar nature where nitrogen replaces carbon in one or more ring positions?
Benzene
310
What is another term for "Alkanes"?
Paraffins
311
What is the simplest alkane which is a major component of nature gas?
Methane
312
What are hydrocarbons that contain one or more double bonds?
Alkene
313
What is another term for "alkenes"?
Olefins
314
What is the simplest alkene, which is a plant hormone that plays important role in sed germination and ripening of fruits?
Ethene
315
What are hydrocarbons that contain one or more triple bonds?
Alkyne
316
What is the simplest alkyne which is a highly reactive molecule?
Acetylene or Ethyne
317
The compunds, benzene, naphthalene and anthracene are examples of what hydrocarbon?
Aromatic hydrocarbon
318
What aromatic hydrocarbon is used as a component of mothballs?
Naphthalene
319
In 1956, the International Union of Pure and Applied Chemistry (UIPAC) devised a systematic way of naming organic compounds. What is this called
System of Nomenclature
320
In naming of hydrocarbons, what refers to a side chain that is formed by removing a hydrogen atom from an alkene?
Alkyl group
321
Compounds that contain halogens are called?
Halides
322
The organic compounds that contains oxygen but not in the carbonyl group are called?
Alcohols and ethers
323
What organic compunds contain the hydroxyl as the fuctional group and are considered derivatives of water?
Alcohols
324
What organic compounds contain nitrogen?
Amines and Amides
325
What organic compunds in which two hydrocarbon groups that can be aliphatic or aromatic are attached to one oxygen atom?
Ethers
326
Which of the following gases is usually used as a refrigerant?
Dimethyl ether
327
Which of the following statements regarding organic substances is FALSE?
Organic substances generally dissolve in high concentration acids
All organic matter contains carbon
Organic matter is generally stable at very high temperatures
Organic substances generally do not dissolve in water
Organic matter is generally stable at very high temperatures
328
A susbtance that disociates in solutions to produce postive and negative ions is called?
Electrolyte
329
Which of the following is most likely to prove that a substance is inorganic
The substance evaporates in room temperature and pressure
The substance is heated together with copper oxide and the resulting gases are found to gave no effect on limestone
Analysis shows that the substance contains hydrogen
The substance floats in water
The substance is heated together with copper oxide and the resulting gases are found to gave no effect on limestone
330
Which of the following elements and compunds is unstable in its pure form?
Sodium
331
What element is known as the lightest metal?
Lithium
332
What refers to the attraction between like molecules?
Cohesion
333
Which of the following is the strongest type of bonds?
Covalent
334
When all of the atoms of a molecule are the same, the substance is called a/an?
Compound
335
Reactions generally proceed faster at high temperatures because of which of the follwing?
The molecules are less energetic
The molecules collide more frequently
The activation energy is less
The molecules collide more frequently and the activation energy is less
The molecules collide more frequently and the activation energy is less
336
The condition of a liquid electrolyte is measured in terms of its:
Specific Gravity
337
An element maybe defined as a substance with all atoms of which have the same?
Atomic number
338
The device which measures the acid content of the cell is called?
Hydrometer
339
Incopper atom, the valence ring contains how many electron?
One electron
340
A______ is a cell designed to produc electri current and can be recharged.
Secondary cell
341
Which of the following statement is FALSE?
In general, as reaction products are formed, they ract with each other reform reactants
At equilibrium, the net reaction rate is zero
The different rate is the mathematical expression that shows how the rate of a reaction depends on volume
The net rate at which a reaction proceeds from left to right is equal to the forward rate minus the reverse rate
The different rate is the mathematical expression that shows how the rate of a reaction depends on volume
342
What is the opposite of alkali?
Acid
343
The amount of electricity a battery can produce is controlled by the
Strength of the acid
344
What represents the number of protons in the nuclues of an atom?
Atomic number
345
The electrilyte is a solution of water and
Sulfuric acid
346
What is deuteron?
A nucleus containing a neutron and a proton
347
Which of the following elements is NOT radioactive?
Cobalt
348
The formula for Dinitrogen Pentoxide is:
N2O5
349
One of the following statement is wrong. Which one is it?
Electron is an elementary quantity of negative electricity
Proton is an elementary quantity of positive electricity
An atom is composed of a central nucleus and orbital electrons
The mass of an electron is heavier than that of a proton
The mass of an electron is heavier than that of a proton
350
What are compounds with the same molecular formula bur with different structural formula?
Isomers
351
What is formed when a carboxylic acid and an alcohol react, with water as a by-product?
Ester
352
What common carboxylic acid is found in yogurt?
Lactic acid
353
What carboxylic acid is found in grapes?
Tartaric acid
354
What carboxlic acid is found in coconut oil?
Lauric acid
355
What do you call the distance pattern in space which the atoms of metal arranged themselves whem they combine to produce a substance of recognizable size?
Space-lattice
356
When a solid has crustalline structure, the atoms arranged in repeating structures called?
Unit cell
357
What refers to a crystal imperfection charavterized by regions of severe atomic misfit where atoms are not properly surrounded by neighbor atoms?
Dislocation
358
What is the process of putting back the lost electrons to convert the ion back to a metal?
Reduction
359
Oxidation in an electrochemical cell always takes place where?
At the anode
360
Reduction in an electrochemical cell always takes place where?
At the cathode
361
What is equal to the fraction of the isotopes in a naturally occurring sample of the element?
The relative abundance of the isotope
362
What refers to salts of weak bases dissolving in water to form acidic solution?
Hydrolysis
363
Which of the following elements has the highest atomic number?
Plutonium
364
All are properties of gaseous state except one. Which one?
May be expanded or may be compressed
Have low desities
Indefinite shape
Mixed uniformly when soluble in one another
Mixed uniformly when soluble in one another
365
All are properties of liquid state except one. Which one?
Do not expand nor compress to any degree
Usually flow readily
Indefinite shape but fixed volume
Do not mix by diffusion
Do not mix by diffusion
366
What type of hydrocarbons do not contain the benzene group or the benzene rin?
Aliphatic hydrocarbon
367
What is an organic compound that contains the hydroxyl group?
Alcohol
368
What is a reaction in which one molecule adds to another?
Additional reaction
369
Oxygen comprises what percent in mass in the earth's crust?
49.5
370
What percent of the human body is carbon?
18%
371
What refers to how closely individual measurments agree with each other?
Precission
372
What is the physical appearance of sodium?
Silver metal
373
What is the physcial appearance of chlorine?
Yellowish gas
374
What is the physical appearnce of sodium chloride?
White crystal
375
Who proposed the quatum theory in 1900?
Max planck
376
What is a general term that refers to an allowed energy state for an electron in the atom?
Quantum energy level
377
What is general term that refers to an allowed energy state for an electron in the atom?
Quantum energy level
378
Who performed an experiment in 1887 that yielded the charge-to-mass electron in the atom?
J.J. Thompson
379
What is an alloy of mercury with another metal or metals?
Amalgam
380
What is an alloy of mercury with another metal or metals?
Amalgam,,
381
A compound that contains at least one amino group and least one carboxyl group is called?
Amino acid
382
A molecular orbit that is of higher energy aand lower stavility than the atomic orbitals from which it was formed is called?
Antibonding molecular orbital
383
A molecular orbit that is of lower energy and greater stability than the atomic orbitals from which it was formed is called?
Bonding molecular orbital
384
An ion containing a central metal cation bonded to one or more molecules or ions called?
Complex ion
385
Compounds containing CN- ion are called
Cyanides
386
A molecule that does not possess a dipole moment is called?
Nonpolar molecule
387
What refers to a substance that when dissolved in water, gives a solution that is notelectrically conducting?
Non-electrolyte
388
What refers to a chemical formula that shows how atoms are bonded to one another in a molecule?
Structual formula
389
What refers to ions that are not involed in the overall reaction?
Spectator ions
390
A compound distinguised by a high molar mass, ranging into thousands and millions of grams, and made up of amny repaeting cells is called?
Polymer
