Exam questions Flashcards
(135 cards)
1
Q
Choose the item that represents the total number of protons and neutrons in the nucleus of an atom.
a. atomic number
b. mass number
c. ionic character
d. isotope
A
b
2
Q
Select the group that makes a -3 anion.
a. 3
b. 4
c. 5
d. 6
A
c
3
Q
Choose they type of element that tends to lose electrons to form cations.
a. metals
b. non-metals
c. noble gases
d. group 4 elements
A
a
4
Q
Determine which statement is an accurate trend as you go from the left to right across a period.
a. ionization energy decreases
b. atomic radius increases
c. electron affinity increases
d. electronegativity decreases
A
c
5
Q
Determine the compound that is not covalent.
a. C6H12O6
b. CF4
c. KCIO4
d. PH3
A
c
6
Q
The compound with both a correct name and formula is;
a. MgO2 magnesium dioxide
b. MgO magnesium (II) oxide
c. MgO2 magnesium (IV) oxide
d. MgO magnesium oxide
A
d
7
Q
Select the compound that contains a non-polar covalent bond.
a. F2
b. NaCl
c. BeO
d. CO
A
a
8
Q
Determine the formula which represents sulfuric acid.
a. H2S(aq)
b. H2SO4 (aq)
c. H2S(g)
d. H2SO3 (aq)
A
b
9
Q
The elements phosphorus, sulfur, and chlorine are listed below. These elements listed in order of decreasing atomic radius are;
a. phosphorus, sulfur, chlorine
b. sulfur, phosphorus, chlorine
c. chlorine, sulfur, phosphorus
d. phosphorus, chlorine, sulfur
A
a
10
Q
The atomic number of element Z is 2. The atomic number of another element with similar chemical properties is;
a. 8
b. 16
c. 18
d. 20
A
c
11
Q
The ion/atom that has the electronic configuration most similar to the chloride is;
a. sulfide
b. nitride
c. silicon
d. magnesuim
A
a
12
Q
When oxygen atoms form compounds with metals, they tend to;
a. lose electrons
b. gain electrons
c. share electrons
d. oxygen is unreactive
A
b
13
Q
Choose the substance that is a binary compound.
a. potassium chlorite
b. ammonium chloride
c. potassium chloride
d. potassium chlorate
A
c
14
Q
Choose the correct formula for carbonic acid
a. H2CO3 (aq)
b. HCO3 (aq)
c. HC (aq)
d. H3CO4 (aq)
A
a
15
Q
Choose the correct formula for the compound stannous phosphate is;
a. T3(PO4)4
b. T3(PO4)2
c. Sn3(PO4)2
d. Sn3(PO4)4
A
c
16
Q
An element is soft, silver-coloured solid. It reacts violently and forms a basic solution when it is dropped into water. The element is most likely a member of which of the following groups?
a. Halogens
b. Alkali Metals
c. Alkaline Earth Metals
d. Noble gases
A
b
17
Q
Determine which statement is an accurate trend as you go down a group in the periodic table.
a. ionization energy increases
b. atomic radius decreases
c. electron affinity increases
d. electronegativity decreases
A
d
18
Q
Choose the statement about a neutral atom that is incorrect
a. the number of protons equals the number of electrons
b. the number of electrons is equal to the number of neutrons
c. the atomic number is equal to the number of protons
d. the number of protons cannot change
A
b
19
Q
The difference in electronegativity between two bonded atoms determines what type of bond forms. Which electronegativity difference indicates the presence of an ionic bond
a. 0
b. 1.7
A
d
20
Q
What is the name for the attraction that exists between molecules?
a. Covalent bond
b. Ionic bond
c. Intermolecular force
d. Electrical attraction
A
c
21
Q
When exposed to oxygen, iron metal oxidizes and iron (III) oxide appears on the surface. Which of the following substances is a product in the chemical reaction?
a. O2(g)
b. Fe2O3(g)
c. Fe(s)
d. Fe2O3(s)
A
d
22
Q
Choose the reaction that represents a single displacement
a. 2Ba(s) + O2(g)> 2BaO(s)
b. 2HgO(s)> 2 Hg(s)+ O2(g)
c. 2Al(s) + 3Fe(NO3)2(aq)> 3Fe(s) + 2Al(NO3)3(aq)
d. Pb(NO3)2(aq) + 2KI(aq)> PbI2(s)+ KNO2(aq)
A
c
23
Q
Determine which reaction will not occur.
a. NaF + Cl2
b. NaI+Cl2
c. NaI+Br2
d. NaBr+ F2
A
a
24
Q
Determine which metal will react with water.
a. gold
b. lead
c. calcium
d. mercury
A
c
25
Select the compound that is insoluble
a. lead nitrate
b. potassium sulfide
c. sodium carbonate
d. silver acetate
d
26
The combination of atoms that forms a basic oxide is;
a. Na and O
b. N and O
c. Na and OH
d. N and OH
a
27
The combination of solutions that will produce a precipitate is:
a. potassium hydroxide and sodium chloride
b. sodium hydroxide and barium nitrate
c. iron (III) chloride and sodium sulfide
d. ammonium nitrate and magnesium chloride
c
28
Which of the following is not an acidic oxide?
a. NO2
b. SO3
c. MgO
d. CO2
c
29
Which of the following is not balanced?
a. C2H4+ O2> CO2 + 2H2O
b. P + Cl2> PCl5
c. Zn + 2HCl > ZnCl2+ H2
d. FE+ O2> Fe2O3
c
30
What would be the products of the decomposition of Ni2O3
a. Ni +O2
b. N+O
c. N+I2+O
d. Ni2+O2
a
31
Why is hydrogen included in the metal activity series
a. It forms a positive ion
b. It forms a negative ion
c. It cannot react with other elements
d. All of the above
a
32
A__________ is a homogenous mixture of a solute dissolved in a solvent.
a. Precipitate
b. Catalyst
c. Solution
d. Cation
c
33
4Na+O2> 2Na2O is what type of reaction
a. synthesis
b. Decomposition
c. Single displacement
d. double displacement
a
34
Organic compounds are so names because they contain what types of bonds
a. carbon- halogen bonds
b. carbon - hydrogen bonds
c. hydrogen bonds
d. carbon- oxygen bonds
b
35
the conversion of carbonic acid producing a hydrogen atom is what type of reaction
a. synthesis
b. single displacement
c. combustion
d. decomposition
d
36
H2SO4 +CaCO3> H2CO3+ CaSO4 is an example of:
a. double displacement reaction
b. a neutralization reaction
c. both a and b
d. a synthesis reaction
c
37
Chemical equations must be balanced because of ___________
a. The Rate Law
b. The Law of Conservation of Mass
c. The Law of Decomposition
d. Combustion of Organic Compounds
b
38
_________ involves the burning of a hydrocarbon to produce water and carbon dioxide.
a. Incomplete Combustion
b. Neutralization
c. Complete Combustion
d. Composition
c
39
Which of the following statements correctly describes a decomposition reaction
a. a compound breaks down into smaller compounds or elements
b. two compounds combine to make a larger compound
c. two elements switch places between compounds
d. a compound changes state
a
40
Which equation most accurately represents the synthesis reaction between lithium and oxygen
a. Li+O2> LiO2
b. 2LiO> 2Li+ O2
c. 6Li +O2> 2Li3O
d. 4Li +O2> 2Li2O
d
41
Which is the formula of the hydrocarbon shown in the chemical equation: 2CxHy(g) + 9O2(g)> 6CO2(g) + 6H2O(g)
a. C2H4
b. C2H6
c. C3H4
d. C3H6
d
42
If a car's exhaust system has a hole that allows exhaust fumes to leak into the passenger compartment, the biggest danger when the car running would be;
a. carbon monoxide
b. unburned hydrocarbons
c. soot
d. carbon dioxide
a
43
Which shows the general equation for a neutralization reaction that involves a hydroxide compound
a. acid+ ionic compound> water +base
b. water+ ionic compound> acid+ base
c. acid + base > water + ionic compound
d. water+ base > acid + ionic compound
c
44
Which of the following metals may displace sodium in a displacement reaction
a. magnesium
b. hydrogen
c. lithium
d. silver
c
45
Which type of reaction occurs when sulfuric acid is heated to produce water, oxygen, and sulfur dioxide
a. synthesis
b. decomposition
c. single displacement
d. double displacement
b
46
You have 42.04g of a sample of carbon. Calculate the number of moles of carbon in the sample
a. 3.5
b. 505.9
c. 1.752
d. 12.01
a
47
If you have 4.257 mol of Ca(OH)2, the number of molecules you have is:
a. 1.79x10 25
b. 332.1
c. 2.56x10 24
d. 2.56x10 22
c
48
If glucose has a formula of C6H12O6, its empirical formula is
a. C2H4O2
b. C3H6O3
c. C12H24O12
d. CH2O
d
49
the molar mass of calcium hydroxide, in g/mol, is
a. 74.09
b. 57.09
c. 56.08
d. 42.09
a
50
In mining, companies remove an impure iron ore from Earth (iron(III) oxide) and react it with carbon in a blast furnace to obtain pure iron and a carbon dioxide by-product. Choose the correct balanced chemical equation for this reaction
a. 2Fe2O(s)+ CO2(g)> 4Fe(s) + C(s) +O2(g)
b. 2FeO(s) +C(s)> 2Fe(s) + CO2 (g)
c. 2Fe2O(s) +3C(s)> 4Fe(s) +CO2(g)
d. 2Fe2O3(s)+ 3C(s)> 4Fe(s) + 3CO2(g)
d
51
Potassium reacts with chlorine to form potassium chloride according to the equation: 2K+ Cl2> 2KCl. If 2 mol of Cl2 reacts with unlimited potassium, how many moles of potassium chloride are produced
a. 2
b. 4
c. 6
d. 8
b
52
Determine the ration of moles of carbon monoxide that react wit oxygen gas to produce carbon dioxide in the following reaction; CO+ O2> CO2
a. 1:1
b. 2:2
c. 1:2
d. 2:1
d
53
If a compound is 25% nitrogen and 75% oxygen by mass, identify the empirical formula of the compound;
a. NO
b. N2O
c. NO2
d. NO3
d
54
In an experiment, 3.48g of methane (CH4) gas reacted with oxygen and produced 8.44g of carbon dioxide, as described in the following equation; CH4+ 2O2> CO2+ 2H2O. Identify the correct percent yield of carbon dioxide:
a. 96.3%
b. 75.3%
c. 81.4%
d. 88.2%
d
55
Pyrite, FeS2, reacts with oxygen as shown below; 4FeS2+ 11O2> 2Fe2O3 + 8SO2. Identify which quantity represents the number of moles of O2 that have reacted of 3.25 mol of SO2 are produced
a. 3.58 mol
b. 0.25 mol
c. 4.47 mol
d. 0.406 mol
c
56
How many oxygen atoms are in 49g of H2SO4
a. 2.4x10 24
b. 6.02x10 23
c. 3.01x10 23
d. 1.2x10 24
d
57
The mass of 3.75mol of KF is
a. 3.75g
b. 58.1g
c. 217.8g
d. 108.9 g
c
58
The empirical formula of a compound is CH2. Its molar mass is 42g/mol. what is its molecular formula?
a. CH
b. C3H6
c. C12H12
d. C2H6
b
59
If 236.1g of tin (II) chloride is the actual yield obtained in a reaction for which the theoretical yield is 288g, the percentage yield is;
a. 71.15%
b. 78.51%
c. 81.98%
d. 84.11%
c
60
The Law of Definite Proportions states that;
a. Substances can be made up of only one type of element
b. all substances contain hydrogen and carbon
c. a compound contains elements in certain fixed proportions
d. the proportions of elements in a compound can change
c
61
One drop of water weights 0.06g. How many molecules of water are there in this one drop
a. 1.33x10 21
b. 2.0x10 21
c. 3.9x10 23
d. 1.16x10 25
b
62
What unknown value(?) is required to balance the following equation: C3H8 +?O2> 3CO2 +4H2O
a. 2
b. 3
c. 4
d. 5
d
63
Which of the following samples contains the same number of atoms as 40.00g of Neon?
a. 4.00g of He
b. 40.00g of C
c. 24.00g of Mg
d. 80.00g of Ar
d
64
Identify which one of the following particles is the unknown product in this nuclear equation: 60/25 Mn> 4/2He +?
a. 56/27 Co
b. 58/24 Cr
c. 55/26 Fe
d. none of the above
d
65
what is the percentage by mass of silver in silver sulfide (Ag2S)
a. 33.3%
b. 77.1%
c. 66.7%
d. 87.1%
d
66
True/False: One mole of magnesium hydroxide contains 6.02x10 23 ions of magnesium
T
67
True/False: if the percentage, by mass, of hydrogen in ammonia, NH3, is 17.6%, then 100g of ammonia contains 85.6g of nitrogen
F
68
True/False: the molecular formula of a compound is the formula that yield the simplest ratio between the atoms of the elements in a compound
F
69
True/ False: the isotopes of an element differ by the number of protons in the nucleus
F
70
True/ False: competing side reactions and impurities can lead to a large percent error
T
71
True/ False: In most chemical reactions, the actual yield will be less than or equal to the theoretical yield
T
72
True/ False: the amount of excess reagent determines the amount of product formed in a chemical reaction
F
73
True/ False: If the molar mass of an ionic compound is 9.02g/mol, then 18.04g of the compound has 6.02x10 23 molecules in it.
F
74
true/ false: gamma particles have the strongest penetration when compared to alpha and beta particles
T
75
true/ false: the law of conservation of mass indicates that what goes into a reaction must come out
T
76
salt water is an example of which solution combination (solute-solvent)
a. solid-solid
b. solid- liquid
c. liquid-solid
d. liquid- liquid
b
77
The solubility of a gas in water always
a. increases with increases temperature
b. decreases with increased temperature
c. remains the same when the temperature changes
d. depends on the gas
b
78
identify the spectator ions for the reaction of an aqueous solution of sodium acetate with an aqueous solution of silver nitrate
a. Ag+(aq) + CH3COO-(aq)
b. Na+ (aq) + NO3-(aq)
c. Na+(aq) + CH3COO-(aq)
d. Ag+(aq) + NO3-(aq)
b
79
Identify the correct net ionic equation for the reaction of an aqueous solution of sodium sulfate with an aqueous solution of barium chloride
a. 2Na(aq) + 2Cl(aq)> 2NaCl(aq)
b. SO4(aq) + Ba(aq)> BaSO4(s)
c. Na2SO4(aq) +BaCl2(aq) > BaSO4(s) + 2NaCla(aq)
d. Na2SO4(aq) +BaCl2(aq)> BaSO4(aq) +2NaCl (s)
b
80
A strong base:
a. is more harmful then a strong acid
b. ionizes completely
c. reacts with very few substances
d. is a concentrated base
b
81
Aqueous sodium chloride contains 3.66g solute dissolved in 250 mL of solution. Given the molar mass of NaCl = 58.5g/mol, what is the amount concentration of the solution
a. 0.1 mol/L
b. 0.25 mol/L
c. 0.4 mol/L
d. 1.46 mol/L
b
82
Identify which equation shows how magnesium nitrate ionizes in water;
a. Mg(NO3)2(s)> Mg+(aq) +2NO3-(aq)
b. Mg(NO3)2(s)> Mg+2(aq) + 2NO3-(aq)
c. Mg(NO3)2(s)> Mg+2(aq) +NO3-(aq)
d. Mg(NO3)2(s)> Mg+3(aq) + 2NO3-(aq)
b
83
Identify which unit does not express concentration
a. mol/L
b. g/mol
c. ppm
d. mass or volume%
b
84
Identify the ions formed when calcium fluoride dissolves in water
a. Ca2+, 2F-
b. Ca2+, F2-
c. 2Ca+, F2-
d. Ca+, F-
a
85
You require 5L of 0.0125mol/L sodium carbonate solution. Determine which of the following represents the mass of sodium carbonate required to make this solution.
a. 6.625g
b. 3.325g
c. 2.165g
d. 9.256g
a
86
```
Identify which substances are solutions
I. Tin II. Alloys III. Air IV. Tea
a. IV only
b. III and IV only
c. II, III and IV only
d. all of the above
```
c
87
A conductivity apparatus and some blue litmus are placed in an unknown solution. The light glows brightly and the blue litmus turns red. Determine which solution could be the unknown.
I. Hydrochloric acid, HCl II. Vinegar, CH3COOH III. Sodium hydroxide, NaOH IV. aqueous ammonia NH3
a. I
b. III
c. I and II
d. III and IV
a
88
What is the ppb concentration of oxygen in Lake Ontario of a 3g sample of water contains 1.5x10 -7 of oxygen in 750mL of water
a. 0.2
b. 2
c. 0.0002
d. 20
a
89
when treating water, what type of material causes small particles in the water to clump together
a. Floc
b. chlorine
c. coagulant
d. disinfection
c
90
which of the following contaminants is an example of a chemical contaminant in water
a. virus
b. twig
c. pesticide
d. protozoa
c
91
true/ false: a strong acid will strongly conduct electronegativity
T
92
true/false: hard water has a low concentration of calcium ions
F
93
True/ false: lithium is a biological contaminant
F
94
true/ false: an immiscible solution will show one substance floating on top of another
T
95
true/ false: 5% of all water on earth is fresh water
F
96
true/ false: dilution is the process of adding water to a solution in order to increase its concentration
F
97
true/ false: magnesium can be used to precipitate hydroxide in qualitative analysis
T
98
true/ false: carbonic acid is created when rain reacts with carbon dioxide in the atmosphere
T
99
true/ false: medications like birth control pills are being discovered lingering in treated drinking water
T
100
true/ false: E.coli can never be removed from a natural water source
T
101
true/ false: the endpoint of a titration of sodium hydroxide by sulfuric acid will result in phenolphthalein turning pink
F
102
true/ false; a vinegar sample with a pH of 6 is 1000 times more acidic than another sample with a pH of 10
F
103
true/ false: increased phosphate and nitrate ions in rivers can be caused by agricultural run-off
T
104
true/ false: thermal pollution increases water temperature, and causes a decreased oxygen concentration
T
105
true/ false: in the neutralization of nitric acid by potassium hydroxide, the salt is formed is potassium nitrate
T
106
when the temperature of a gas in a closed container is increased, determine which of the following is true
a. pressure of the gas decreases
b. volume of the gas increases
c. volume of the as decreases
d. both a and b
b
107
determine the conditions at SATP
a. 101.3kPa and 273K
b. 1 atm and 0C
c. 725 mmHg and 25C
d. 100 kPa and 298 K
d
108
When considering Boyle's law, the density of a gas would tend to _________ when the pressure is increased (Hint: density =mass/volume)
a. decrease
b. increase
c. stay the same
d. fluctuate
b
109
Compared to 3 mol of He gas at SATP, 3 mol of H2 gas at SATP:
a. has equal volume but unequal mass
b. has equal volume and equal mass
c. has unequal volume and unequal mass
d. has unequal volume and equal mass
a
110
a 22g sample of an unknown gas occupies 6.2L at SATP. the molar mass of this gas in g/mol is:
a. 11
b. 22
c. 44
d. 88
d
111
if you were to boil water at the top of a mountain in the Rockies, the temperature of the water would be:
a. less than 100C
b. more than 100C
c. equal to 100C
d. not enough information given to answer this question
a
112
the following reaction takes place in a closed vessel at SATP. Determine the ratio of moles of oxygen reacted to moles of carbon dioxide produced. 2CO+ O2> 2CO2
a. 1:1
b. 2:1
c. 1:2
d. 2:2
c
113
a sample fo N2 gas has a volume of 12L at SATP. if the temperature remains constant and the pressure is increased to 162.6 kPa, the final volume of the gas is
a. 3.69L
b. 7.38L
c. 39L
d. 3.74L
b
114
Glucose reacts with oxygen in the body as shown in the following equation. How may litres of carbon dioxide would be produced if 98.3g of glucose completely reacted with oxygen at SATP? C6H12O6+ 6O2> 6CO2+ 6H2O
a. 51.25L
b. 81.25L
c. 102.5L
d. 25.63L
b
115
the volume of a mixture of 0.065 mol of nitrogen and 0.067 mol of oxygen at STP is
a. 2.96L
b. 0.74L
c. 1.48L
d. 1.64L
a
116
the pressure exerted by 8 moles of a gas in a 500 mL container at 25C is
a. 10.8MPa
b. 39.6MPa
c. 19.8MPa
d. 9.91MPa
b
117
At SATP, 58g of methane (CH4) will occupy a volume of
a. 100.75L
b. 200.50L
c. 91L
d. 182L
c
118
if a sample of krypton gas and a sample of bromine gas are at the same temperature, the average velocity of the krypton molecules will be;
a. slower than bromine gas
b. faster than bromine gas
c. the same as the bromine gas
d. the answer depends on the pressure of each sample
b
119
the solubility of a gas in water increases with
a. an increase in pressure and a decrease in temperature
b. a decrease in pressure and a increase in temperature
c. an increase in both pressure and temperature
d. a decrease in both pressure and temperature
a
120
for any mixture of gases, the total pressure is equal to;
a. the sum of the partial pressures of the component gases
b. the product of the partial pressures of the component gases
c. the pressure of the gas present in the highest proportion
d. the pressure of the gas with the highest kinetic energy
a
121
the temperature of a fixed mass of gas is doubled while its volume is halved. The gas pressure will
a. quadruple
b. double
c. stay the same
d. decrease by a factor of 4
c
122
if the total pressure of a mixture of two gases A and B is 43kPa, and the mole fraction of gas A is 0.74, then the pressure due to gas B is about
a. 11.18kPa
b. 33kPa
c. 24.42kPa
d. none of the above
a
123
which of the following reactions properly describes a reaction that occurs to create acid rain
a. CO + H2O> H2CO2
b. CO2+ H2O> 2HCO3
c. CO+ H2O> H2CO3
d. CO2+ H2O> H2CO3
d
124
identify which of the following is not a significant component of the ozone cycle
a. O-(g)+ O2(g)> O3(g)
b. 2O(g)->O2(g)
c. O3(g)> O2(g) +O-(g)
d. O2(g)> 2O-(g)
b
125
Hydrogen gas reacts with oxygen at 120C, according to the equation 2H2(g)+O2(g)> 2H2O(g). If 52 mL of hydrogen gas are reacted with 52mL of oxygen gas at the same temperature and pressure, the volume of the water produced will be:
a. 52mL
b. 78mL
c. 26mL
d. 39mL
a
126
true/ false: the solubility of a gas in a liquid increases as the temperature increases
F
127
true/ false: Phytoremediation is a biological method of carbon sequestration
T
128
true/ false: ozone is a pollutant at ground level but is not considered one in the stratosphere
T
129
true/ false: radon is an inert gas that is found in basements
F
130
true / false: at SATP the molar volume of any gas is 24.8L/mol
T
131
true/false: the stratosphere has a much lower pressure than the troposphere
T
132
true/ false: kraft dinner cooks faster on top of a mountain than at sea level
F
133
true/ false: polar bears are the face of global warming
T
134
true / false: 760 mmHg is the same as 1 atm
T
135
true/ false: temperature and pressure generally increase as we move upwards through out atmosphere
F
