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WorksheetsChemical Reactions
Total questions: 17
Worksheet time: 12mins
Name
Class
Date
1.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
2.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
3.
According to the law of conservation of mass...
a)
sometimes atoms are lost
b)
sometimes atoms are gained
c)
atoms are never lost nor gained
d)
atoms are lost and gained
4.
The force that holds 2 atoms together is called a ________________.
a)
Chemical Reaction
b)
Chemical Bond
c)
Diatomic Chemical
d)
Glue
5.
Which of the following is a chemical change?
a)
water freezes to form ice
b)
sugar dissolves in water
c)
gasoline burns in a car engine
d)
a piece of metal expands when it is heated
6.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
7.
A change in the shape of an object is an example of _________________.
a)
a chemical change
b)
energy
c)
an endothermic change
d)
a physical change
8.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
9.
Increasing the concentration of a reactant in a chemical reaction will _____________.
a)
decrease the rate of the reaction
b)
stop the reaction from happening
c)
increase the rate of the reaction
d)
have no effect on the rate of the reacion
10.
Which of the following represents a chemical change?
a)
cutting a piece of paper with scissors
b)
cooling a mixture of air and kerosene vapor to obtain liquid kerosene
c)
burning a piece of notebook paper in the presence of oxygen
d)
heating water over a flame to its boiling point
11.
Which of the following is an example of a physical change?
a)
souring milk
b)
mixing baking soda and vinegar
c)
rusting metal
d)
mixing oil and vinegar
12.
Which of the following is a chemical change?
a)
the rusting of iron
b)
dissolving salt in water
c)
melting an ice cube
d)
bending a copper wire
13.
Which of the following is an example of a chemical change?
a)
rusting of a bicycle
b)
painting a house
c)
washing a dog
d)
tearing up a newspaper
14.
Which is an example of a physical change?
a)
sodium and chlorine form salt
b)
a copper ring turns white and green
c)
a log burns in a fire
d)
using sand and water to build a sand castle on a beach
15.
Which of the following is an example of a physical change?
a)
wood burning
b)
ice melting
c)
food digesting
d)
iron rusting
16.
Raising the temperature of a chemical reaction would make the reaction __________________.
a)
happen slower
b)
happen faster
c)
stop completely
d)
proceed as normal
17.
Your mother used pancake mix, eggs, and milk to make pancakes. Which of these is the product?
a)
the pancake mix
b)
the eggs
c)
the milk
d)
the pancakes
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