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Chemical Reactions Review Part 1

Total questions: 20

Worksheet time: 40mins

Name
Class
Date
1.

(NH4)2Cr2O7 How many H are in this atom?

a)

2

b)

4

c)

6

d)

8

2.

Cu +HNO3 --> Cu(NO3)2 + H2O + NO. How many Oxygen in product?

a)

5

b)

6

c)

7

d)

8

3.

Which option is correctly balanced?

a)

Fe + H2O --> Fe3O4 + H2

b)

3 Fe + H2O --> Fe3O4 + H2

c)

3 Fe + 4 H2O --> Fe3O4 + 4 H2

d)

3 Fe + 2 H2O --> Fe3O4 + H2

4.

Which Option is Correctly Balanced?

a)

Hg + O2 --> Hg2O2

b)

2 Hg + 2O2 --> Hg2O2

c)

2 Hg + O2 --> Hg2O2

d)

Hg + 2 O2 --> Hg2O2

5.
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
6.

Balance the following chemical equation:

____KClO3 → ____KCl + ____O2

a)

2KClO3 → 4KCl + O2

b)

4KClO3 → 2KCl + 3O2

c)

2KClO3 → 2KCl + 3O2

7.

Which reaction type is the following:

C5H10 + O2 --> CO2 + H2O

a)

Decomposition

b)

Synthesis

c)

Complete Combustion

d)

Double Replacement

8.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
9.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
10.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
11.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
12.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product 
13.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
14.
What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
15.
What coefficients are needed to correctly balance the equation?
_Bi   +   _O2   >   _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
16.

A + B > AB

What type of chemical reaction is this?

a)
single
b)
double
c)
synthesis
d)
decomposition
17.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
18.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
19.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Combination
b)
Decomposition
c)
Single replacement
d)
Double replacement
20.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

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