Questions Flashcards
1
Q
Carbon atoms usually… (electrons)
A
Form 4 covalent bonds
2
Q
Coke is produced from bituminous coal by…
A
Destructive distillation
3
Q
The usual method for preparing CO2 in the laboratory is…
A
Reacting an acid & a carbonate
4
Q
What is the precipitate formed when CO2 is bubbled into limewater?
A
CaCO3
5
Q
What is the “lead” in the pencil?
A
Graphite & clay
6
Q
What is the first & simplest alkane?
A
Methane
7
Q
What does a slight oxidation of a primary alcohol give?
A
An aldehyde
8
Q
What is the characteristic group of an organic ester?
A
-COO-
9
Q
What is the organic acid that can be made from ethanol?
A
Acetic acid
10
Q
What reaction can an ester be prepared by?
A
An alcohol & an organic acid
11
Q
What compounds that have the same composition but differ in their structural formulas called?
A
Isomers
12
Q
Ethene is the first member of…
A
Alkene series
Unsaturated hydrocarbons
13
Q
What is the most active nonmetallic element?
A
Fluorine
14
Q
What is the order of decreasing activity of the halogens?
A
F, Cl, Br, I
15
Q
What formula does a light-sensitive substance used on photographic film have
A
AgBr
16
Q
Sulfur dioxide is the anhydride of
A
Sulfurous acid
17
Q
The charring action of sulfuric acid is due to it being…
A
A dehydrating agent
18
Q
Ammonia is prepared commercially by the…
A
Combining of hydrogen & nitrogen gases
Haber process
19
Q
A nitrogen that has a color is…
A
Nitrogen dioxide
20
Q
If a student heats a mixture of ammonium chloride & calcium hydroxide in a test tube, he will detect
A
The odor of ammonia
21
Q
The difference between ammonia & the ammonium ion is…
A
A proton
22
Q
An important ore of iron
A
Hematite
23
Q
A reducing agent used in the blast furnace
A
CO
Carbon monoxide
24
Q
The metal with the electron shell configuration of [Ar]3d(10)4s(1)
A
Cu, copper
25
Reaction type that can be viewed as redox often involving hydrocarbon fuels & oxygen releasing heat & light
Combustion
26
Reaction type that can be viewed as redox involving an element & a compound becoming a new element & a new compound
Single Replacement
27
Reaction type that does not generally involve the transfer of electrons & is NOT viewed as a redox reaction
Acid/base
28
Reaction type that could possibly be viewed as a redox reaction in which only one substance is present in the reactants
Decomposition
29
Oxidation state for S in Na2SO3
+4
30
Oxidation state for P in PO4 (3-)
+5
31
Oxidation state for Ca in CaCO3
+2
32
Oxidation state for S in SO2
+4
33
Oxidation state for Cr in K2CrO4
+6
34
Reducing agents are substances that
Contain elements that are oxidized
35
When elemental bromine (Br2) reacts with a solution of sodium iodide (NaI)
Bromine will be reduced
36
The difference between HCl & HC2H3O2 as acids is
The first is highly ionized
37
The hydronium ion is represented as
H3O (+)
38
H2SO4 is a strong acid because it is
Highly ionized
39
The common ionic reaction if an acid with a base involves ions of...
Hydrogen & hydroxide
40
The pH of a solution with a hydrogen ion concentration 1*10^-3 is
+3
41
What is an acid according to the Bronsted-Lowry Theory
A proton donor
42
What does a buffer solution do
Resists changes in pH
43
What is the point at which a titration is complete called?
End point
44
The concentrations in an expression of the equilibrium constant are given in...
mol/L
45
The equilibrium constant of water at 298K is equal to
1*10^-7
46
The pH of a solution that has a hydroxide ion concentration of 1*10^-4 mole/liter is
10
47
The pH of a solution that has a hydrogen ion concentration of 1*10^-4 mole/liter is
4
48
A small value for K, the equilibrium constant indicates that...
The concentration of the un-ionized molecules must be relatively large compared with the ion concentration
49
In the Haber process for making ammonia, an increase in pressure favors
The forward reaction
50
A change in which of these conditions will change the K of an equilibrium given as a starting point?
Temperature
51
If Ca(OH)2 is dissolved in a solution of NaOH, its solubility, compared with that in pure water is
Decreased
52
When enthalpy is negative & entropy is positive, the free energy...
Is always negative
53
When enthalpy is positive & entropy is positive, the free energy...
Is negative at high temperatures
54
When enthalpy is negative & entropy is negative, the free energy...
Is negative at lower temperatures
55
When enthalpy is positive & entropy is negative, the free energy...
Is never negative
56
When free energy is zero, the system...
Is at equilibrium & there is no net reaction
57
List 5 factors that affect the rate of a reaction
```
Nature of reactants
Surface area exposed
Concentrations
Catalyst presence
Temperature
```
58
What does the addition of a catalyst to a reaction do...
It changes the activation energy
59
An increase in concentration is related to...
The number of collisions directly
60
At the beginning of a reaction, the reaction rate for the reactants is...
Largest, then decreasing
61
A synthesis will occur spontaneously after the activation energy is provided if the heat of formation of the product is...
Large & negative
62
The reaction of aluminium with dilute H2SO4 can be classified as
Single replacement
63
For a metal atom to replace another kind of metallic ion in a solution, the metal atom must be...
Higher in the activity series than the metal in solution
64
One reason for a double displacement reaction to go to completion is that
A product is given off as gas
65
A salt is derived from a strong base & a weak acid will undergo hydrolysis & give a solution that will be
Basic
66
Enthalpy is an expression for the
Heat content
67
The heat of formation of a reaction is recorded for
298 K
68
The property of being able to add enthalpies is based on the
First Law of Thermodynamcis
69
Distillation of water cannot remove
Volatile liquids like alcohol
70
The ratio in water of hydrogen to oxygen by mass is
1 : 8
71
Decomposing water by an electric current will give a ratio of hydrogen to oxygen by volume equal to
2 : 1
72
If 10g of ice melts at ) degrees, the total quantity of heat absorbed is
3,340 J
73
To heat 10g of water from 4 degrees to 14 degrees requires
418 J
74
The abnormally high boiling point of water in comparison to similar compounds is due primarily to
Hydrogen bonding
75
A metallic oxide placed in water would most likely yield
A base
76
A solution can be both...
Supersaturated & saturated
77
The solubility of a solute must indicate
T of solution
Quantity of solute
Quantity of solvent
78
A foam is an example of
A gas dispersed in a liquid
79
When another crystal was added to a water solution of the same substance, the crystal seemed to remain unchanged.
Its particles were...
Exchanging places with others in the solution
80
Zinc + sulfuric acid ->
zinc sulfate + hydrogen
81
Magnesium + oxygen ->
magnesium oxide
82
Potassium + water ->
potassium hydroxide + hydrogen
83
In the graphic representation of the energy contents of the reactants & the resulting products in an exothermic reaction, the energy content would be
Higher for the reactants
84
The process of separating components of a mixture by making use of the difference in their boiling points is called...
Fractional distillation
85
When oxygen combines with an element to form a compound, the resulting compound is called
An oxide
86
According to the activity charts of metals, which metal would react most vigorously in a dilute acid solution?
Magnesium
87
Graham's Law refers to
Gaseous diffusion
88
When 200mL of a gas at constant pressure is heated, its volume...
Increases
89
When 200mL of a gas at constant pressure is heated from ) to 100 C, the volume must be multiplied by...
373/273
90
When the level of mercury inside a gas tube is higher than the level in the reservoir, you find the correct pressure inside the tube by taking the outside pressure reading and -----?----- the difference in the height of mercury
Subtracting
91
When a gas is collected over water, the pressure is corrected by
Subtracting the water vapor pressure of water at that temperature
92
AgCl
Silver Chloride
93
CaSO4
Calcium sulfate
94
Al2(SO4)3
Aluminum sulfate
95
NH4NO3
Ammonium nitrate
96
FeSO4
Iron (2) sulfate
