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Unit 7- Chemical Reactions Review

Total questions: 100

Worksheet time: 3hrs 42mins

Name
Class
Date
1.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

2.

What type of reaction involves 2 substances combining to form 1 new compound?

a)

Decomposition Reaction

b)

Single Displacement Reaction

c)

Double Displacement Reaction

d)

Synthesis Reaction

3.

What type of reaction involves one element replacing another element in a compound?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

4.

What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

5.

What type of reaction involves one element replacing another element in a compound?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

6.

What are the reactants in the chemical equation pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

7.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

8.

What type of chemical reaction is this one?

Al(OH)3 --> Al2O3 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

9.

What type of chemical reaction is this one?

CuO + CO2 --> CuCO3

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

10.

What type of chemical reaction is this one?

Ca + MgCl2 --> CaCl2 + Mg

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

11.

What type of reaction is illustrated below?

2HI --> H2 + I2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

12.

What type of reaction is illustrated below?

Zn + H2S --> ZnS + H2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

13.

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

14.

2Na +S → Na2S

a)

Double Replacement

b)

Decomposition

c)

Combustion

d)

Synthesis

15.

2 NO2 ---> 2 O2 + N2

a)

Synthesis

b)

Single Replacement

c)

Decomposition

d)

Combustion

16.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

17.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

18.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

19.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

20.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

21.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

22.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

23.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

24.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

25.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

26.

What type of reaction is the following:
Ag3N + 3HBr−>3AgBr+H3NAg_3N\ +\ 3HBr->3AgBr+H_3N

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

27.
KOH + H3PO4 --> K3PO4 + H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
28.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
29.
The following reaction is an example of what reaction type? 
CoCO3 → CoO + CO2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
30.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
31.

What type of reaction is shown in all four models?

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

32.

Ca + AlCl3→ CaCl2 + Al

a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
33.
Si + S8 →Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
34.
Mg + N2 →Mg3N2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
35.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
36.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

37.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

38.

a different way to say Law of Conservation of Matter

a)

Law of Conservation of Volume

b)

Law of Conservation of Energy

c)

Law of Conservation of Mass

d)

Law of Conservation of Environment

39.

a way to describe a chemical reaction using chemical formulas and other symbols

a)

mathematical formula

b)

mathematical equation

c)

chemical formula

d)

chemical equation

40.

a substance that takes part in and undergoes change during a reaction

a)

coefficient

b)

subscript

c)

reactant

d)

product

41.

a new material formed in a chemical reaction

a)

coefficient

b)

subscript

c)

reactant

d)

product

42.

Suppose you have 15g of baking soda and mix it with 15g of vinegar. When they are combined they bubble and fizz a lot. The final solution has a mass of 25g. What happened to the "lost" 5g?

a)

it dissappears

b)

it is still there just not weighted

c)

it is in the gas that is formed

d)

nothing happened

43.

Balance this equation:

MgCl2 --> Mg4 + Cl2

a)

It's already balanced.

b)

4 MgCl2 --> Mg4 + 4 Cl2

c)

4 MgCl2 --> Mg4 + 5 Cl2

44.

How many atoms of aluminum are on each side of the following equation?

4Al + 3O2 --> 2Al2 O3

a)

2

b)

6

c)

4

d)

1

45.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
46.

The Law of Conservation of Mass States

a)

Energy cannot be created nor destroyed, it can only change form.

b)

Mass cannot be created nor destroyed, it can only change form.

c)

Mass can be created or destroyed, it cannot change form.

47.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
48.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

49.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

50.

A student pours hydrochloric acid (HCl) into an open beaker that contains a piece of magnesium (Mg). A chemical reaction occurs, and the data for the reaction is shown in the image. Which of the following answer choices best identifies a possible explanation for the change in mass? SELECT TWO.

a)

There was a increase in mass.

b)

There was a decrease in mass.

c)

There was no change in mass.

d)

Because the reaction occurred in an open container, a gas that was produced was able to escape

e)

Because the reaction occurred in an open container, a gas in the air was able to react with the other chemicals

51.

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

a)

The heat caused the chemical to become less dense.

b)

The reaction gave off more heat than was added.

c)

Some of the lighter particles were destroyed.

d)

Some of the particles escaped as a gas formed.

52.

A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?

a)

The heat caused the compound to become more dense.

b)

The reaction gave off less heat than was added.

c)

Some of the heavier particles multiplied inside the nail.

d)

Extra particles from the air were added to the nail during burning.

53.

How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

2

b)

3

c)

5

d)

6

54.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
55.
Is this equation balanced or unbalanced? 
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
56.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Reactant

c)

Product

d)

Produce

57.
Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?
a)
4.75 grams
b)
5.0 grams
c)
5.25 grams
d)
7.5 grams
58.

What coefficients are needed to balance the equation?

__ SiCl4 + __ H2O → __ H4SiO4 + __ HCl



(a)  

59.

What coefficients are needed to balance the equation?

__ Al + __ HCl → __ AlCl3 + __ H2



(a)  

60.

__ KClO3 → __ KClO4 + __ KCl

(a)  

61.

__ H2SO4 + __ HI → __ H2S + __ I2 + __ H2O

(a)  

62.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

63.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

64.

What is the total number of atoms present in 5Na3PO4?

a)

5

b)

55

c)

40

d)

8

65.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

66.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

67.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

6CO2 + 6H2O ---> C6H12O6 + 6O2

68.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

69.
Which problem is balanced?
a)
PbO2 + 2H2
b)

SO2 + H2O --> H2SO4

c)
2Na + 2H2O --> 2NaOH + H2
70.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
71.

Balance this equation
__ Zn+ __ HCl--> __ ZnCl2 + __ H2

(a)  

72.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)

1, 2, 1

b)
already balanced
c)
2,1,1
d)
1,1,2
73.

Balance this equation
__P4 + __O2 --> __P2O3

(a)  

74.

Fill in the blanks with coefficient:

PCl5+_ H2O→_ HCl+H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

75.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
76.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

77.

Select all of the reactants in the following reaction:

Hydrogen + Oxygen --> Water

a)

Hydrogen

b)

Oxygen

c)

Water

78.

Select all of the reactants in the following reaction:

Barium carbonate + Nitric acid --> Barium nitrate + Water + Carbon dioxide

a)

Barium carbonate

b)

Nitric acid

c)

Barium nitrate

d)

Water

e)

Carbon dioxide

79.

Select all of the reactants in the following reaction:

Sodium hydroxide + Hydrochloric acid --> Sodium chloride + Water

a)

Sodium hydroxide

b)

Hydrochloric acid

c)

Sodium chloride

d)

Water

80.
Magnesium can be burned in air to produce solid magnesium oxide.
a)
2Mg(s) + O2(g)→ 2MgO(s)
b)
Mg(s) + O(g) → MgO(s)
c)
2Mg(s) + CO2(g) → 2MgO(s) + C(s)
d)
2Mg(s) + O2(g) → Mg2O2(s)
81.
Sodium reacts with chlorine to produce sodium chloride.
a)
NaCl(s) → Cl(g) + Na(s)
b)
Na(s) + CO2(g) → NaCO2(s)
c)
2Na(s) + Cl2(g) → 2NaCl(s)
d)
Na(s) + Cl(g) → NaCl
82.

When hydrogen reacts with sulfur, a smelly gas, dihydrogen monosulfide, is produced.

a)

H2 + S → HS

b)

H2 + S → H2S

c)

H + S→ HS

d)

H + S→ H2S

83.

Hydrogen gas and nitrogen monoxide gas forms water and nitrogen gas.

a)

H2 + NO --> H2O + N2

b)

H + NO --> H2O + N

c)

H2 + N2O3 --> H2O + N2

d)

H + NO --> H2O + N2

84.

Aluminum bromide and chlorine gas produce aluminum chloride and bromine gas.

a)

AlBr3 + Cl2 --> AlCl3 + Br2

b)

AlBr3 + Cl --> AlCl3 + Br

c)

Al3Br + Cl --> Al3Cl + Br2

d)

AlBr3 + Cl2 --> AlCl3 + Br

85.

Hydrogen gas and chlorine gas produce hydrogen chloride

a)

H2 + Cl2 --> HCl

b)

H + Cl --> HCl

c)

H2 + Cl2 --> H2Cl2

d)

H + Cl --> H2Cl

86.

Aluminum and oxygen produces aluminum oxide

a)

Al + O2 --> Al2O3

b)

Al + O --> Al2O3

c)

Al3 + O2 --> Al2O3

d)

Al + O --> AlO

87.

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

a)

20 g

b)

15 g

c)

10 g

d)

3 g

88.

Why does this picture demonstrate the Law of Conservation of Matter?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Matter

89.

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

a)

the mass would decrease

b)

the mass would increase

c)

the mass would stay the same

d)

it depends on the type of reaction

90.

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

a)

the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

b)

the mass would increase because mass was created

c)

the measurable mass would stay the same because nothing would be able to leave the system.

d)

it depends on the type of reaction

91.

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

a)
b)
c)
d)
92.

In a reaction A + B ----> C.

Reactant A has 5g and product C has 9g.

How many grams does reactant B should have?

a)

4g

b)

5g

c)

9g

d)

14g

93.

In a chemical equation, is it true that -

a)

the reactant side and product side can have different numbers of atoms for each element

b)

there can be different elements on the reactant side and the product side

c)

the reaction must always take place in a closed system in order for it to work

d)

the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made

94.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

95.

When heated, mercuric oxide decomposes to form liquid mercury and oxygen. A scientist heated 10 grams (g) of mercuric oxide and formed 9.3 grams of liquid mercury. How many grams of oxygen were formed?

a)

0.7 g

b)

9.3 g

c)

10.0 g

d)

19.3 g

96.

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown. Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

a)

The mass of the reactants is the same as the mass of the products.

b)

The products have a greater mass because matter was created during the reaction.

c)

The reactants have a greater mass because some of the mass was converted to heat.

d)

The reactants have a greater mass because some matter was destroyed by the reaction.

97.

When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs. What happens to the total mass of the contents of the test tube?

a)

The total mass increases.

b)

The total mass decreases.

c)

The total mass remains the same.

d)

Part of the mass is changed to heat energy.

98.

Based on the Law of Conservation of Matter, predict the minimum amount of magnesium that will react with all 22.1 grams of oxygen to produce 40.3 grams of magnesium oxide. 

a)

18.2

b)

62.4

c)

22.1

d)

40.3

99.

 A lab group reacts Na2O with HCl to produce NaCl and H2O. When writing their lab report, they came up with the following equation to represent the reaction:

Na2O + HCl → NaCl  +  H2O

Does this equation satisfy the Law of Conservation of Matter? Why or why not?

a)

Yes, since there are 5 reactant atoms and 5 product atoms

b)

Yes, since there is a subscript of 2 on both sides of the equation.

c)

No, since there are two sodium atoms as reactants, but only one sodium atom as a product.

d)

No, since there is a liquid and a solid as reactants, but a gas and a solid as a product

100.

 A flask with vinegar in it has a mass of 160 grams. A balloon with baking soda in it has a mass of 40 grams. The balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. The balloon inflates to a large volume. What will the total mass of the balloon and flask be after the balloon inflates and why?

a)

Less than 200 grams because the solid baking soda disappears

b)

200 grams, because all the atoms remain in the balloon or flask.

c)

More than 200 grams because the size of the balloon is so much larger 

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