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WorksheetsChemical Reactions
Total questions: 15
Worksheet time: 23mins
Name
Class
Date
1.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
a)
true
b)
false
2.
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
3.
The left side of the equation below is called
a)
Products
b)
Reactants
4.
The right side of the equation below is called the
a)
products
b)
reactants
5.
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.
6.
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
7.
A chemical reaction that absorbs heat
a)
Single replacement
b)
Exothermic
c)
Endothermic
d)
Decomposition
8.
Which of the following is NOT a sign of a chemical reaction?
a)
Color changes
b)
Cutting into fourths
c)
Light is produced
d)
Gas is formed
9.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
10.
What type of reaction is illustrated below?
FeS + Hal --> H2S + FeCl
FeS + Hal --> H2S + FeCl
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
11.
Which of the following answers will balance the equation below?
__K + __Br2 --> __KBr
__K + __Br2 --> __KBr
a)
2, 1, 1
b)
2, 3, 2
c)
2, 1, 2
d)
1, 2, 3
12.
If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be
a)
4CO₂ + 3H₂O
b)
3CO₂ + 4H₂O
c)
2CO₂ + 3H₂O
d)
3CO + 4H₂O
13.
Which of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO3
__HNO2 + __O2 --> __HNO3
a)
4, 1, 4
b)
1, 2, 1
c)
1, 2, 1
d)
2, 1, 2
14.
What type of reaction is illustrated below?
2HI --> H2 + I2
2HI --> H2 + I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
15.
What type of reaction is illustrated below?
Zn + H2S --> ZnS + H2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
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