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Unit 5 Chemical Reactions Review

Total questions: 25

Worksheet time: 26mins

Name
Class
Date
1.

Which is NOT an indication of a chemical change?

a)

Unexpected temperature Change

b)

Shape Change

c)

Formation of a precipitate

d)

Unexpected production of gas

2.

What is the left part of a chemical equation called?

2H2 + O2 --> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

3.

What is the right part of a chemical equation called...

2H2 + O2 --> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

4.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
5.
__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF
a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
6.
__C6H12O6 + __O2 --> __H2O + __CO2
a)
1,6,6,6
b)
already balanced
c)
1,6,1,6
d)
2,12,12,12
7.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
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?
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
10.

Why must chemical equations be balanced?

a)

So that the equation doesn't explode

b)

The reaction won't happen until it is balanced

c)

Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

d)

Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e

11.
How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?
a)
H-6, S-4, O-4
b)
H-1, S-2, O-8
c)
H-2, S-1, O-4
d)
H-2, S-4, O-4
12.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
13.
Which of the following could indicate a chemical change? 
a)
All of the answers could indicate Chemical Change 
b)
a color change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
14.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
15.

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

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Combustion

16.

What type of chemical reaction has the following configuration?


Ionic Compound(aq) + Ionic Compound(aq) --> Compound(s) + Compound(aq)


AB(aq) + XY(aq) --> AY(s) + XB(aq)

a)

Composition/Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

17.

What type of chemical reaction has the following configuration?


Compound --> Substance + Substance


AB --> A + B

a)

Composition/Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

18.

Identify the type of chemical reaction picture above

a)

Composition/Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

19.

Balance this equation ​ (a)   N2 + ​ (b)   H2 --> ​ (c)   NH3

Choose from the below words
1
3
2
20.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
21.
Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?
a)
investigation 1
b)
investigation 2
c)
investigation 3
d)
investigation 4
22.

Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?

a)

Number 1

b)

Number 2

c)

Number 3

d)

Number 4

23.

In the lab, students mixed substances together and made observations. They wrote the following equations for their the experiment. Which of the following conclusions is valid?

a)

Result (i) indicates a chemical change because a change in color occurred

b)

Result (ii) indicates a chemical change because the products were in aqueous solution

c)

Result (ii) indicates a chemical change because of the formation of a precipitate

d)

Result (i) indicates a chemical change because a gas is one of the products

24.

In the equation 2Mg+O2 → 2MgO2Mg+O_2\ \rightarrow\ 2MgO   which are the reactants?

a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
25.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and 2 H2O

d)

O2 and H2O

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