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AP Chemistry End of Year Review

Total questions: 51

Worksheet time: 44mins

Name
Class
Date
1.

What is the oxidation number of F in OF2?

a)

+1

b)

-1

c)

+2

d)

-2

2.

The first five ionization energies of an element are listed in the table above. Which of the following correctly identifies the element and best explains the data in the table?

a)

Al, because it has five core electrons

b)

Al, because it has three valence electrons

c)

P, because it has five valence electrons

d)

P, because it has three electrons in the p sublevel

3.

Which of the following chemical reactions below represents a precipitation reaction?

a)

HC2H3O2 (aq) + NH3 (aq) → C2H3O2- (aq) + NH4 +(aq)

b)

Ba2+ (aq) + SO42- (aq) → BaSO4 (s)

c)

Zn(OH)2 (s) + 2 OH- (aq) → [Zn(OH)4] 2- (aq)

d)

2 K(s) + Br2 (l) → 2 KBr(s)

e)

N2O4 (g) → 2 NO2(g)

4.

Which of the following identifies the slowest gas and provides the proper justification

a)

O2: oxygen gas has a higher molar mass, so it is a slower moving gas

b)

O2 : oxygen gas has a higher electronegativity, so it is slower

c)

H2: hydrogen gas has the smallest molar mass, so it is the slowest moving gas

d)

H2: hydrogen gas is the most ideal gas, so it is the slowest

5.

Which of the following is soluble in water?

a)

KNO3

b)

AgCl

c)

BaSO4

d)

Fe(OH)3

6.

What type of glassware is the most accurate for measuring out amounts of liquids?

a)

graduated cylinder

b)

buret

c)

volumetric flask

d)

beaker

e)

erlenmeyer flask

7.

What type of glassware should be used to prepare a solution?

a)

erlenmeyer flask

b)

beaker

c)

volumetric flask

d)

graduated cylinder

8.

Which of the following could be the identity of a white crystalline solid that exhibits the following properties?


It melts at 320° C.

It does not conduct electricity as a solid.

It conducts electricity in an aqueous solution.

a)

C6H12O6

b)

CaF2

c)

Fe

d)

CO2

9.

Which of the following is expected to have the highest boiling point?

a)

Br2

b)

Cl2

c)

N2

d)

O2

10.

Which of the following has the largest second ionization energy?

a)

P

b)

Al

c)

Mg

d)

Na

e)

Si

11.

What happens when you add more electrons to the ionic radius ?

a)

Bigger

b)

smaller

c)

no change

12.

What type of elements form an ionic bond?

a)

metal and nonmetal

b)

nonmetal and nonmetal

c)

metal and metal

13.

What type of intermolecular force is only found in polar molecules?

a)

London Dispersion Force

b)

Dipole-dipole force

c)

hydrogen bond

14.

Will this molecule be polar or nonpolar?

a)

polar

b)

nonpolar

15.

Choose the correct shape for this molecule:

a)

Bent

b)

Trigonal pyramidal

c)

Trigonal planar

d)

Linear

e)

Tetrahedral

16.

Choose the correct shape for this molecule:

a)

Trigonal planar

b)

Trigonal pyramidal

c)

Bent

d)

Linear

e)

Tetrahedral

17.

Reduction is...

a)

loss of electrons

b)

loss of protons

c)

gain of electrons

d)

gain of protons

18.

What is happening in terms of entropy?

8 ZnO (s) + S8 (s) → 8 ZnS (s) + 4 O2 (g)

a)

increasing, +ΔS

b)

increasing, -ΔS

c)

decreasing, +ΔS

d)

decreasing, -ΔS

19.

What is happening in term of enthalpy?

KBr (s) → KBr (l)

a)

endothermic, +ΔH

b)

exothermic, +ΔH

c)

endothermic, -ΔH

d)

exothermic, -ΔH

20.

Which of the following would form a molecular solid?

a)

Ne

b)

CO2

c)

NaCl

d)

Au

21.

Which gas would behave more ideally?

a)

N2

b)

H2

c)

CH4

d)

Cl2

22.

Which of the following would have the highest boiling point?

a)

CH3CH3

b)

CH3CH2OH

c)

CH4

d)

CH3CH2CH3

23.

What types of intermolecular forces are present in NH3? Check all that apply

a)

London dispersion

b)

dipole-dipole

c)

Hydrogen bonds

d)

ionic interactions

24.

2 SO2 (g) + O2 (g) ↔ 2 SO3 (g)

Removing O2 (g) will

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase pressure

d)

have no change

25.
If the equilibrium constant is much greater than one (K >> 1) then
a)
Equilibrium is not established.
b)
Equilibrium lies to the right (products are favored)
c)
Equilibrium lies to the left (reactants are favored)
d)
Neither products or reactants are favored.
26.
Define chemical equilibrium.
a)
A reaction is reversible.
b)
The concentration of the reactants is equal to the concentration of the products.
c)
The rate of a forward reaction is equal to the rate of the reverse reaction.
d)
The reaction stops and no further change in concentration occurs.
27.
Adding a catalyst to a chemical reaction changes the rate of reaction by causing
a)
a decrease in the activation energy
b)
an increase in the activation energy
c)
a decrease in the heat of reaction
d)
an increase in the heat of reaction
28.

What would be my the overall order of this rate law?

Rate=k[A]2[B]1

a)

0 Order

b)

1st Order

c)

2nd Order

d)

3rd Order

29.

step 1: O3 → O2 + O

step 2: O3 + O → 2 O2


The oxygen atom (O) is considered to be a(n)...

a)

reactant

b)

catalyst

c)

intermediate

d)

activated complex

30.

Which of the following shows the correct reaction for BaCl2 dissolving?

a)

Ba 2+(aq) + Cl2-(aq) → BaCl2(s)

b)

BaCl2(aq) → Ba 2+(aq) + 2Cl-(aq)

c)

BaCl2(s) → Ba 2+(aq) + 2Cl-(aq)

d)

Ba 2+(aq) + 2Cl-(aq) → BaCl2(s)

31.
The pH at the equivalence point of the titration of a strong acid with a strong base is:
a)
3.9
b)
4.5
c)
7.0
d)
8.2
32.
Which of the following is a conjugate acid/base pair?
a)
HCl/OCl-
b)
H2SO4/SO42-
c)
NH4+/NH3
d)
H3O+/OH-
33.

Consider the reaction X → Y +Z

Which of the following is a possible rate law?

a)

Rate = k[X]

b)

Rate = k[Y]

c)

Rate = k[Y][Z]

d)

Rate = k[X][Y]

e)

Rate = k[Z]

34.

The rate expression for a particular reaction is rate = k[A][B]2. If the initial concentration of B is increased from 1 M to 3 M, the initial rate will increase by which of the following factors?

a)

2

b)

6

c)

12

d)

3

e)

9

35.

Which expression correctly describes the equilibrium constant for the following reaction?

4NH3(g) + 5O2(g) ⇆ 4NO(g) + 6H2O(g)

a)
b)
c)
d)
e)
36.

What is the rate law of the proposed reaction mechanism above?

a)

Rate = k [NO2] [F2]

b)

Rate = k [NO2] [F]

c)

Rate = k [NO2]2 [F2]

d)

Rate = k [NO2F]2 [F2]

37.

What is the pKa of the acid in this titration

a)

12

b)

17

c)

8

d)

3

38.

Given their standard reduction potentials, which of the species is going to be oxidized?

Cu2+/Cu = 0.34V

Zn2+/Zn = -0.76V

a)

Cu

b)

Zn

c)

CuSO4

d)

ZnSO4

39.
Oxidation happens at the
a)
Anode
b)
Cathode
c)
Salt bridge
d)
Voltmeter
40.
What atom matches this electron configuration?
1s2 2s2 2p6 3s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
41.

What is the noble gas notation for sulfur?

a)

[Ar] 3p4

b)

[He] 3s23p4

c)

[Ne] 3s23p4

d)

[Na] 3s23p4

42.

What is the identity of element Z?

a)

Boron

b)

Carbon

c)

Neon

d)

Magnesium

43.

Which of the following shows a hydrogen bond within DNA?

a)
b)
c)
d)
44.

Which of the following would have the highest boiling point?

a)

CH3CH3

b)

CH3CH2OH

c)

CH4

d)

CH3CH2CH3

45.

Which gas would behave more ideally?

a)

N2

b)

H2

c)

CH4

d)

Cl2

46.

What happens in term of ΔH?

PCl3(g) + Cl2(g) ↔ PCl5(g) where ΔG° = −92.50

a)

endothermic, +ΔH

b)

endothermic, -ΔH

c)

exothermic, +ΔH

d)

exothermic, -ΔH

47.

NaOH + Cr(OH)3 + Br2 → Na2CrO4 + H2O + NaBr


Atoms or ions of which element are oxidized in the reaction above?

a)

Cr: each ion loses 3 electrons

b)

Na: each ion loses 1 electron

c)

Br: each atom loses 1 electron

d)

H: each ion gains 1 electron

48.
In a voltaic cell, the salt bridge is necessary for
a)
the movement of electrons to create a current
b)
the movement of ions to create a current
c)
the movement of electrons to maintain the neutrality of solution
d)
the movement of ions to maintain the neutrality of solution
49.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
50.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
51.
What element always has an oxidation number of -1?
a)
Hydrogen
b)
Fluorine
c)
Chlorine
d)
Iodine

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