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Ch 7 Practice Quiz (Bank)

Total questions: 97

Worksheet time: 1hrs 3mins

Name
Class
Date
1.

The substances that undergo change in a chemical reaction are called

(a)  

2.

A solution of silver nitrate, AgNO3, is added to a solution of sodium chloride, NaCl. After the reaction is complete, solid AgCl (silver chloride) and NaNO3 (sodium nitrate) remain as precipitates. What are the products of this chemical reaction?

a)

AgNo3 and NaCl

b)

AgNO3 and AgCl

c)

AgCl and NaNO3

d)

NaCl and NaNO3

3.

What does the ARROW in a chemical equation mean?

(a)  

4.

Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?

a)

Na + Br2 --> NaBr

b)

2Na + Br2 --> NaBr

c)

Na + Br2 --> 2NaBr

d)

2Na + Br2 --> 2NaBr

5.

The coefficients in a balanced chemical equation always express the ratio of

a)

moles of reactants and products

b)

volume of reactants and products

c)

atoms of reactants and products

d)

mass of reactants and products

6.

A (a)   is the number that appears before a formula in a chemical equation.

7.

A (a)   is a representation of a chemical reaction in which the reactants and products are expressed as formulas.

8.

A (a)   is an amount of a substance that contains approximately 6.02 x 1023 particles of that substance.

9.

How many atoms are present in 3 moles of silicon?

a)

6.02 x 1023 atoms

b)

1.80 x 1023 atoms

c)

28.086 atoms

d)

3 x (6.02 x 1023) atoms

10.

The molar mass of carbon is (a)   g.

11.

How many grams of CO2 are there in 3.2 mol of the compound?

a)

140.8 g

b)

6.02 x 1023 g

c)

13.75 g

d)

38.4 g

12.

The molar mass of NaCl is 58.5 g. A sample of NaCl contains 188g of the compound. The sample contains _____ of NaCl.

a)

3.21 mol

b)

58.5 mol

c)

6.02 x 1023 mol

d)

10998 mol

13.

A + B ---> AB

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

14.

AB ---> A + B

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

15.

A + BC ---> B + AC

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

16.

AB + CD ---> AD + CB

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

17.

A reaction in which a substance reacts rapidly with oxygen, often producing heat and light. Products always include H2O and CO2.

(a)  

18.

The process in which an element loses electrons during a chemical reaction is called (a)   .

19.

The process in which an element gains electrons during a chemical reaction is called (a)   .

20.

Zn + CuCl2 ---> Cu + ZnCl2

a)

synthesis

b)

single replacement

c)

combustion

d)

double replacement

21.

CaO + H2O ---> Ca(OH)2

a)

synthesis

b)

single replacement

c)

combustion

d)

double replacement

22.

2C2H6 + 7O2 ---> 4CO2 + 6H2O

a)

synthesis

b)

single replacement

c)

combustion

d)

double replacement

23.

Energy stored in the chemical bonds of a substance is called (a)   energy.

24.

Chemical reactions involve the _____ of chemical bonds in the reactants, and the _____ of chemical bonds in the products.

a)

breaking, formation

b)

formation, breaking

c)

gaining, losing

d)

losing, gaining

25.

Breaking chemical bonds _____ energy.

a)

requires

b)

releases

c)

destroys

d)

creates

26.

The formation of chemical bonds _____ energy.

a)

requires

b)

releases

c)

destroys

d)

creates

27.

A chemical reaction that releases energy to its surroundings is called an (a)   reaction.

28.

A chemical reaction that absorbs energy from its surroundings is called an (a)   reaction.

29.

2HgO + heat ---> 2Hg + O2

a)

endothermic reaction

b)

exothermic reaction

30.

C3H8 + 5O2 ---> 3CO2 + 4H2O + heat

a)

endothermic reaction

b)

exothermic reaction

31.

A (a)   is the rate at which reactants change into products over time.

32.

An decrease in temperature will _____ the reaction rate.

a)

increase

b)

decrease

c)

not affect

33.

An increase in surface area will _____ the reaction rate.

a)

increase

b)

decrease

c)

not affect

34.

Stirring the reactants will generally _____ the reaction rate.

a)

increase

b)

decrease

c)

not affect

35.

A (a)   is a substance that affects the reaction rate without being used up in the reaction.

36.

Increasing the concentration of a reactant will _____ the reaction.

a)

increase

b)

decrease

c)

not affect

37.

Chemical reactions involve collisions between particles of reactants. If these collisions occur more frequently, then the reaction rate will _____.

a)

increase

b)

decrease

c)

not change

38.

When a catalyst is used in a chemical reaction, the catalyst is written

a)

above the arrow

b)

in the reactants

c)

in the products

d)

in parentheses

39.

When you add baking soda to vinegar, the mixture fizzes as CO2 gas is produced. If you added water to the vinegar before you mixed it with the baking soda, what effect would this have on the rate of CO2 production?

a)

in would increase

b)

it would decrease

c)

it wouldn't change

40.

Which of the following does NOT affect the reaction rate of chemical reactions?

a)

temperature

b)

surface area

c)

stirring

d)

size of container

41.

In a chemical reaction that is at equilibrium, which of the following is true?

a)

All of the reactants have been converted to products.

b)

The reaction stops even though some reactants remain.

c)

Forward and reverse reactions occur at the same rate.

d)

All of the products are gases.

42.

In the chemical reaction shown, how could you shift the equilibrium toward water?

a)

increase the temperature

b)

increase the pressure

c)

decrease the amount of oxygen

d)

add steam to the mixture

43.

A _____ reaction is a reaction in which the conversion of reactants into products and the conversion of products into reactants can happen simultaneously.

a)

reversible

b)

chemical

c)

exothermic

d)

single replacement

44.

During chemical equilibrium, the reactants change into products just as fast as the products change back into reactants.

a)

true

b)

false

45.

When a change is introduced to a system in equilibrium, the equilibrium shifts in the direction that relieves the change.

a)

true

b)

false

46.

According to Le Châtelier’s principle, if you added heat to the system, the equilibrium would shift in the direction that _____heat from the system.

a)

adds

b)

removes

47.

According to Le Châtelier’s principle, if you increased the pressure, the equilibrium would shift in the direction that _____the pressure of the system.

a)

increases

b)

decreases

48.

Le Châtelier’s principle tells you that if you decreased the ammonia concentration by removing ammonia from the system, the equilibrium would shift in the direction that _____ammonia.

a)

removes

b)

produces

49.

The synthesis of ammonia is

a)

endothermic

b)

exothermic

50.

The decomposition of ammonia is

a)

endothermic

b)

exothermic

51.

If we added heat to this system, equilibrium would shift to _____.

a)

remove heat

b)

add heat

52.

If we added heat to this system, equilibrium would shift to _____.

a)

increase the amount of ammonia

b)

decrease the amount of ammonia

53.

How many atoms of O in NH4OH?

a)

4

b)

1

c)

5

d)

3

54.

How many atoms of N in NH4OH?

a)

4

b)

1

c)

5

d)

3

55.

How many atoms of H in NH4OH?

a)

4

b)

1

c)

5

d)

3

56.

How many atoms of H in Ca(OH)2?

a)

1

b)

2

c)

3

d)

0

57.

How many atoms of O in Ca(OH)2?

a)

1

b)

2

c)

3

d)

0

58.

How many atoms of Ca in Ca(OH)2?

a)

1

b)

2

c)

3

d)

0

59.

How many atoms of C in 2C2H6?

a)

2

b)

1

c)

4

d)

12

60.

How many atoms of H in 2C2H6?

a)

2

b)

6

c)

8

d)

12

61.

How many atoms of H in 3Mg(OH)2?

a)

1

b)

2

c)

5

d)

6

e)

3

62.

How many atoms of Mg in 3Mg(OH)2?

a)

1

b)

2

c)

5

d)

6

e)

3

63.

How many atoms of O in 3Mg(OH)2?

a)

1

b)

2

c)

5

d)

6

e)

3

64.

How many atoms of O in the reactants?

HCl + NaOH --> NaCl + H2O

(a)  

65.

How many atoms of O in the products?

HCl + NaOH --> NaCl + H2O

(a)  

66.

How many atoms of H in the reactants?

HCl + NaOH --> NaCl + H2O

(a)  

67.

How many atoms of H in the products?

HCl + NaOH --> NaCl + H2O

(a)  

68.

Is this equation balanced?

HCl + NaOH --> NaCl + H2O

a)

yes

b)

no

69.

How many atoms of H in the reactants?

H3PO4 + KOH --> K3PO4 + H2O

(a)  

70.

How many atoms of O in the reactants?

H3PO4 + KOH --> K3PO4 + H2O

(a)  

71.

Is this equation balanced?

H3PO4 + KOH --> K3PO4 + H2O

a)

yes

b)

no

72.

How many atoms of each element in the REACTANTS?

2H3PO4 + 3Mg(OH)2 --> Mg3(PO4)2 + 6H2O

a)

3

1.

Mg

b)

2

2.

P

c)

14

3.

O

d)

12

4.

H

73.

What type of reaction?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

74.
H2 + MgCl2 --> 2 HCl + Mg
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
75.
Na + Cl2 --> 2 NaCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
76.

4Si + S8 --> 2Si2S4

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

77.

3Ca + 2AlCl3 --> 3CaCl2 + 2Al

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

78.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
79.

2Pb(NO3)2 --> 2PbO + 4NO2 + O2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

80.
3Mg + N2 --> Mg3N2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
81.

2NO2 --> N2 + 2O2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

82.
2Fe + 3H2SO4 --> Fe2(SO4)3 + 2H2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
83.

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

84.

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

85.

AB + CD --> CB + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

86.

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

87.

Which shows a single replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

88.

Which shows a synthesis reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

89.

Which shows a double replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

90.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

91.

What type of reaction is the following:
C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

92.

What type of reaction is the following:
2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

93.

What type of reaction is the following:
2NaHCO3−> Na2CO3+CO2+H2O2NaHCO_3->\ Na_2CO_3+CO_2+H_2O  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

94.

What type of reaction is the following:
Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

95.

What type of reaction is the following:
3CuS +2Al −> Al2S3+3Cu3CuS\ +2Al\ ->\ Al_2S_3+3Cu

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

96.

What type of reaction is the following:
2C4H10 +13O2 −> 8CO2+10H2O2C_4H_{10}\ +13O_2\ ->\ 8CO_2+10H_2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

97.

What type of reaction is the following:
Na2S +2HCl −> H2S+2NaClNa_2S\ +2HCl\ ->\ H_2S+2NaCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

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