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Unit 7: Chemical Reactions

Total questions: 30

Worksheet time: 3600secs

Name
Class
Date
1.

____Al + ____O2 --> ____Al2O3


When the reaction is balanced, what is the correct coefficient for O2

a)

1

b)

2

c)

3

d)

4

2.

Identify the type of reaction below

2 Mg + TiO2 --> Ti + 2 MgO

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

3.

Magnesium metal reacts with HNO3 to produce hydrogen gas and magnesium nitrate.


Which of the following is the correct balanced equation from the word equation above?

a)

Mg + HNO3 --> H + MgNO3

b)

Mg + 2HNO3 --> H2 + Mg(NO3)2

c)

Mg + HNO3 --> H2 + Mg(NO3)2

d)

Mg + 2HNO3 --> 2H + Mg(NO3)2

4.

Identify the type of reaction below

2CuCl --> 2Cu + Cl2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

5.

Iron burns in oxygen to form a black solid, iron (III) oxide.


Which of the following is the correct balanced equation from the word equation above?

a)

Fe + O --> Fe3O

b)

6 Fe + O2 --> 2 Fe3O

c)

4 Fe + 3 O2 --> 2 Fe2O3

d)

4 Fe + 6 O --> 2 Fe2O3

6.

What is the missing product in the following equation?


____Zn + ____H2SO4 --> ____ZnSO4 + ____?

a)

H2S

b)

H2

c)

H2O

d)

H

7.

The following is what type of reaction:

PbCl2 + AgNO3 → Pb(NO3)2 + AgCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

8.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
9.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
10.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
11.

Classify the following reaction.

2KClO3 → 2KCl + 3O2

a)

Synthesis

b)

Combustion

c)

Decomposition

d)

Single Replacement

12.
A chemical change is different than a physical change because in a chemical change
a)
Chemicals are used
b)
Molecules do not physically touch
c)
A new substance is formed and in a physical change no new substance is formed
d)
The change can be seen but in a physical change it cannot
13.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated in the sun and half of it evaporates.
14.
A chemical reaction that absorbs heat
a)
Single replacement
b)
Exothermic
c)
Endothermic
d)
Decomposition
15.

Which of the following is NOT a sign of a chemical reaction?

a)

Color changes

b)

Cutting into fourths

c)

Temperature goes up

d)

Gas is formed

16.

What usually happens to TEMPERATURE in an ENDOthermic reaction?

a)

Increases

b)

Decreases

c)

Stays the same

17.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
18.

If an element is diatomic it should have a subscript of___

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

19.

The symbol for a substance dissolved in solution is ______

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

20.

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO3 → Ag + _____

a)

Cu(NO3)2

b)

No reaction

c)

CuAg

d)

Cu

21.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

22.

Predict the products for the this Single Replacement reaction:

Mg + CuCl →

a)

MgCl2 + Cu

b)

No reaction

c)

MgCu + Cl2

d)

MgCl + Cu2

23.

According to the activity series, which of the following single replacement reactions can occur?

a)

Ca + Al2(SO4)3

b)

Fe + NaOH

c)

Ni + MgSO4

d)

Al + KOH

24.

Based on the activity series, which metal could X represent in the reaction below?

X + Ca (NO3)2 --> Ca + X (NO3)2

a)

Sr

b)

Na

c)

Mg

d)

Zn

25.

When predicting a double replacement reaction we use the__________ ________ to help us determine if a solid is produced or not

a)

Activity series

b)

Solubility Chart

c)

Periodic Table

26.

To predict if a single replacement reaction will take place you should use the____________ __________

a)

Activity series

b)

Solubility Chart

c)

Periodic Table

27.

What is the name for the solid formed during a reaction?

a)

Precipitate

b)

Rocks

c)

Aqueous

28.

Is the following substance soluble or insoluble?

NaNO3

a)

Soluble

b)

Insoluble

29.

Is the following substance Soluble or insoluble?

AlPO4

a)

Soluble

b)

insoluble

30.

The equation H3PO4 + 3KOH --> K3PO4 + 3H2O is an example of which type of reaction?

a)

combustion

b)

decomposition

c)

single replacement

d)

double replacement

e)

synthesis

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