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Duplicate of AP Chemistry Big Idea #3 Flashcards | StudBud
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Duplicate of AP Chemistry Big Idea #3
Duplicate of AP Chemistry Big Idea #3
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APChem big topic #3 review... have fun? (impossible)
Flashcards
43 cards
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Questions
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Answers
1
When the following equation is balanced, the coefficient of Al is __________.
1
4
3
2
2
Which of the following represents the reaction that occurs at the cathode in the cell below?
Pb2+ + 2e- -> Pb
Ag -> Ag+ + e-
Pb -> Pb2+ + 2e-
Ag+ + e- -> Ag
3
Combustion reactions are ______.
Endothermic
Exothermic
4
What is the pOH of a solution at 25.0 °C that contains 1.94 x 10
-10
M hydronium ions.
3.63
1.94
6.34
4.29
5
What is the oxidation number of manganese in the permanganate ion, MnO4
-
?
+7
+1
+2
+4
6
True or false, photosynthesis is an endothermic reaction.
False
True
7
The half-reaction occurring at the cathode during the electrolysis of molten sodium bromide is?
Br2 + 2e- -> 2Br-
Na -> Na+ + e-
2Br- -> Br2 + 2e-
Na+ + e- -> Na
8
Which of the following is an example of a chemical change?
Evaporating milk
Melting wax
Mixing Kool Aid packet in water
Rusting nail
9
What are the spectator ions in the reaction between KOH (aq) and HNO3 (aq)?
K+ and NO3-
H+ and NO3-
H+ and OH-
K+ and H+
10
A Bronsted-Lowry acid is defined as a substance that _________________.
Acts as an electron donor
Acts as a proton acceptor
Increases the Ka value when in water
Acts as a proton donor
11
An endothermic reaction ____ the temperature of the surroundings.
Raises
Lowers
12
The net ionic equation for the reaction between aqueous solutions of HF and KOH is __________.
HF + KOH → H2O + K+ + F-
HF + OH- → H2O + F-
H+ + OH- → H2O
HF + K+ + OH- → H2O + KF
13
What is the pH of an aqueous solution at 25.0 °C in which [H+] is 0.0025 M?
2.25
2.6
3.4
4
14
In a voltaic cell, electrons flow from the _____________ to the ____________.
Anode, Cathode
Cathode, Anode
Anode, Salt bridge
Cathode, Salt bridge
15
The balanced net ionic equation for precipitation of CaCO
3
when aqueous solutions of...
2 Na+ (aq) + CO32- (aq) → Na2CO3 (aq)
2 Na+ (aq) + 2Cl- (aq) → 2NaCl (aq)
Na+ (aq) + Cl- (aq) → NaCl (aq)
Ca2+ (aq) + CO32- (aq) → CaCO3 (s)
16
Which one of the following types of element is most likely to be a good oxidizing agent?
Alkali metals
Halogens
Alkaline earth elements
Transition elements
17
The gain of electrons by an element is called ___________.
Disproportionation
Reduction
Oxidation
Sublimation
18
There are __________ mol of carbon atoms in 4 mol of dimethylsulfoxide (C
2
H
6
SO).
2
4
8
6
19
In a titration of 35.00 mL of 0.737M H
2
SO
4
...
35.0
25.8
39.3
62.4
20
What is the pOH of a 0.0150 M solution of barium hydroxide? (Ba(OH)
2
)
1.52
12.5
1.82
12.2
21
Nitric acid is a strong acid. This means that ______.
HNO3 dissociates completely to H+(aq) and NO3-(aq) in water.
HNO3 does not dissociate at all when dissolved in water.
NO3 produces a gaseous product when it is neutralized.
HNO3 cannot be neutralized by a weak base.
22
The balanced half-reaction in which sulfate ion is reduced to sulfite ion is a _______ process.
One-electron
Four-electron
Three-electron
Two-electron
23
True or false, an endothermic reaction releases heat.
True
False
24
A strong electrolyte is one that can _____ completely in a solution.
Ionize
Associate
React
Dissapear
25
Which of the following is a synthesis reaction:
A + B → AB
AB + CD→ CB + AD
AB → A + B
C + AB → CB
26
The base-dissociation constant, Kb, for pyridine, C
5
H
5
N, is 1.4 x 10
-9
. What is its Ka?
3.8 x 10-4
7.1 x 10-6
1.0 x 102
4.0 x 10-7
27
What is the K
a
of HZ for the following information?
1.2 x 10-5
2.8 x 10-12
1.4 x 10-10
6.9 x 10-9
28
When the following equation is balanced, the coefficients are __________.
1, 3, 1, 2
2, 3, 2, 3
4, 7, 4, 6
4, 3, 4, 3
29
Based on the Ka values, which is the strongest acid?
1.8 x10-4
6.8 x 10-4
1.8x10-5
3.0 x 10-8
30
Of the following, which is the strongest acid?
HClO
HClO3
HClO4
HIO
31
The combustion of ammonia in the presence of excess oxygen yields NO
2
and H
2
O:
119
178
0.954
2.58
32
Which of the following is an example of a chemical change?
Slicing a loaf of bread
Chopping wood
Cutting a cookie
Boiling an egg
33
An exothermic reaction _____ heat, which causes the temperature of the surroundings to ____.
Release, increase
Release, decrease
Absorb, increase
Absorb, decrease
34
Which of the following is an example of a chemical change?
Ripping paper
Sublimation of iodine
Applying hydrogen peroxide to a cut
Dissolving sugar in water
35
A substance that is capable of acting as both an acid and as a base is ________.
Amazing
Amphoteric
Who is Chemistry?
Mr. Carmody himself!
36
Which of the following is an example of a chemical change?
Mixing paints
Digesting food
Bending metal
Mixing iron and sand
37
What is the pH of a 0.35 M aqueous solution of HF? ...
3.25
2.54
3.64
1.81
38
Which of the following is not a strong acid?
HNO3
H2SO4
HNO2
HCL
39
A 17.5 mL sample of an acetic acid (CH
3
CO
2
H) solution required...
0.158
0.423
6.88
0.214
40
The acid of the conjugate base HSO4
-
is...
H2SO4
(SO4)2-
HSO4+
HSO3+
41
Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide:
2.61
2.50
0.41
2.09
42
Under appropriate conditions, nitrogen and hydrogen undergo a combo reaction to yield ammonia:
0.76
1.5
1.2
0.51
43
The purpose of the salt bridge in an electrochemical cell is to ____________.
Maintain electrical neutrality via migration of ions.
Provide a source of ions to react at the anode and cathode.
Allow electrons to travel from the anode to the cathode.
Allow electrons to travel from the cathode to the anode.
