Download 1 1. Classify the following reaction?

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1. Classify the following reaction?
Mg(CN)2(s) + H2SO4(aq)
a)
b)
c)
d)
e)
→
MgSO4(aq) + 2 HCN(g)
Single-Replacement Reaction
Double-Replacement Reaction
Redox Reaction
Combination Reaction
Neutralization Reaction
2. Which of the following reactions is a neutralization reaction?
a) WO3
b) ZnCl2
+
3H2
→
+ H2SO4
c) Na2SO3 + 2 HNO3
d) CaCO3
+
2 HCl
e) 2 CsOH + H2SO4
W + 3H2O
→
ZnSO4
+
2 HCl
→
2 NaNO3 +
→
CaCl2 +
→
H2O + SO2
H2O
+ CO2
Cs2SO4 + 2 H2O
3. Lead chromate is insoluble in water. Using this fact, what is the net ionic equation for the
expected reaction when solutions of lead nitrate and potassium chromate are mixed.
a) Pb2+ + 2 NO3- + 2 K+ + CrO42-
→
PbCrO4 + 2 K+ + 2 NO3-
b) Pb2+ + 2 NO3- + 2 K+ + CrO42-
→
PbCrO4
d) Pb(NO3)2 (aq) + K2CrO4 (aq)
→
PbCrO4 (s)
e) Pb(NO3)2 (aq) + K2CrO4 (aq)
→
N.R.
c) Pb2+ + CrO42-
→
PbCrO4
+
K2CrO4 (aq)
4. For the reaction in Question 3, which of the following is called a spectator ion?
a) K+
b) PbCrO4
c) Pb2+
d) CrO42-
e) none
5. Balance the following equation. What is the sum of the coefficients of the reactants and
products?
__ AgNO3
a) 3
+
__ Fe
b) 4
→
c) 5
__ Fe(NO3)2 + __ Ag
d) 6
e) 7
2
6. What is the oxidation number of sulfur in sulfuric acid?
a) -6
b) -4
c) -2
d) +4
e) +6
7. Which of the halogens is the strongest oxidizing agent?
b) Cl2
a) F2
c) Br2
d) I2
8. Identify the reducing agent in the following reaction.
2 NaCl (aq) + F2 (g)
a) Na+
b) Cl-
c) Cl2
→
2 NaF (aq) + Cl2 (g)
d) NaF
e) F2
9. Which of the following reactions is an oxidation?
a) H – C ≡ C – H
O
║
b) CH3 – C – H
→
→
c) CH3 – CH2 – OH
d) CH2 ═ CH2
→
O
║
e) CH3 – C – H
→
CH2 ═ CH2
O
║
CH3 – C – OH
→
CH3 – CH3
CH3 – CH3
CH3 – CH2 – OH
10. What is the percent of carbon in C2H6F4?
a) 5.71
b) 11.3
c) 17.9
d) 22.6
e) 71.6
11. Which of the following acids decomposes to form a gas?
a) H2CO3
b) HNO3
c) HCl
d) H3PO4
e) H2SO4
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12. A cigarette is found to contain 1.1 x 10-5 g of nickel. What number of atoms does this
represent? Avogadro’s Number = 6.02 x 1023
a) 3.1 x 10-31 b) 4.5 x 1016 c) 1.1 x 1017 d) 2.3 x 1017
e) 6.0 x 1020
13. How many moles of NaCl are contained in a 40 mg sample?
a) 6.84 x 10-3 b) 6.8 x 10-2
c) 0.68 x 10-2
d) 6.8 x 10-4 e) 0.68
14. Aspirin contains 60.00% C, 4.44% H, and 35.56% O. What is the empirical formula of
aspirin?
a) C4H5O
b) C2H2O
c) C5H4O d) C9H8O4
15. What is the empirical formula of hexane,
a) C6H14
b) C4H10
c) C3H7
e) C9H8O2
?
d) C6H12
e) C3H6
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16. Which of the following setups is correct to calculate the number of grams of CO2 produced
from 2 moles of C4H8 according to the following equation? (CO2 = 44 amu)
C4H8 + 6 O2
→
4 CO2 + 4 H2O
a)
2 moles C4H8
x
1 mole C4H8
4 moles CO2
x
44 g CO2
1 mole CO2
b)
2 moles C4H8
x
1 mole C4H8
4 moles CO2
x
1 mole CO2
44 g CO2
c)
2 moles C4H8
x
4 moles CO2
1 mole C4H8
x
44 g CO2
1 mole CO2
d)
2 moles C4H8
x
4 moles CO2
1 mole C4H8
x
1 mole CO2
44g CO2
17. Catabolism of glucose is one source of energy in the human body. How much heat energy is
generated from the reaction of 25.0 g of glucose? (Mw C6H12O6 = 180 amu)
C6H12O6
a) 95.3 kcal
+
6 O2
→
b) 15.9 kcal
6 CO2
+
c) 9.53 x 104 kcal
6 H2O
+ 686 kcal
d) 59.3 kcal
e) 95.3 cal
18. The reaction of 0.68 g of ammonia with excess oxygen according to the following reaction
yields 0.96 g of NO. What is the percent yield?
4 NH3 + 5 O2
a) 78%
→
b) 74%
4 NO +
c) 86%
6 H2O
d) 80%
e) 82%
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19. How many moles of water will be produced from the reaction of 1.5 moles of hydrogen and
0.50 moles of oxygen? (Hint: one reagent is limiting)
2 H2 + O2
a) 0.75
b) 1.0
→
2 H2O
c) 1.5
d) 0.5
e) 3.0
20. A reaction that requires heat is termed _______________.
a)
b)
c)
d)
e)
hysteric
endemic
endothermic
exotropic
exothermic
21. Which of the following statements is incorrect for a monoatomic ideal gas obeying all
assumptions of the molecular kinetic theory?
a)
b)
c)
d)
e)
There are no attractive forces between the atoms.
The atoms are widely separated from one another.
The atoms move rapidly and randomly in straight lines.
Individual atoms of a gas move at different speeds.
Collisions gradually decrease the total energy of the gas.
22. Which conversion of units for pressure is correct?
a) 380 mm Hg = 0.050 atm
b) 1.2 atm
= 8.1 x 102 torr
c) 0.400 atm = 304 mm Hg
d) 480 torr
= 48 mm Hg
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23. A 10 ml bubble of swamp gas is released from the bottom of a swamp where the temperature
is 10 oC and the pressure is 2.5 atm. What will be the volume of the bubble at the surface at
1.0 atm and 28 oC?
a) 24 ml
b) 156 ml
c) 70 ml
d) 27 ml
e) 270 ml
24. An adult human breathes 0.50 L of air at 1.0 atm with each breath. If a 10 L air tank at 200
atm is available, how many breaths will the tank provide?
a) 4.0 x 103
b) 2.0 x 103
c) 1.0 x 103
d) 5.0 x 103
e) 5.0 x 104
25. A scuba diver at a depth of 30 ft in the ocean breathes air at 2.0 atm. The air is about 20%
oxygen and 80 % nitrogen by volume. What is the partial pressure of oxygen?
a) 1.8 atm
b) 1.6 atm
c) 1.0 atm
d) 0.80 atm
e) 0.40 atm
26. The boiling point of CS2 is 46.5 ˚C at 1 atm. If the pressure is decreased to 0.5 atm, what
happens to the boiling point?
a)
b)
c)
d)
It remains unchanged.
It is decreased.
It is increased.
It is exactly doubled.
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27. Which of the following molecules has the highest boiling point?
a) CH3 – CH2 – CH2 – CH3
b) CH3 – CH2 – CH2 – OH
c) CH3 – CH2– OH
d) CH3 – O – CH2 – CH3
CH3
‫׀‬
e) CH3 – CH – CH3
28. In which of the compounds of question 27 would hydrogen bonding be observed?
a) In all of them.
b) In none of them.
c) In b and c.
d) In d only.
e) In a and e.
29. The volume of a neon sign is 1250 ml. It is filled at 25 oC to a pressure of 1.6 mm Hg. How
many moles of neon are in the sign? R = 0.0821 L atm mole-1 K-1
a) 1.1 x 10-4
b) 1.3 x 10-3
c) 8.8 x 10-6
d) 0.11
e) 1.3
30. Which of the following can be used as a "sacrificial" metal to protect an outboard motor
from corrosion?
a) all of the above
b) none of the above
c) Ag
d) Na
e) Zn