What is the main difference between physical and chemical changes?

Physical and Chemical Changes

Quiz
•
Others
•
7th Grade
•
Hard
Rohini Sankar
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Physical changes involve a change in the form or appearance of a substance, while chemical changes involve a change in the chemical composition of a substance.
Physical changes involve a change in size, while chemical changes involve a change in weight.
Physical changes involve a change in state, while chemical changes involve a change in texture.
Physical changes involve a change in color, while chemical changes involve a change in temperature.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Give an example of a physical change.
Melting ice
Rusting iron
Burning wood
Boiling water
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Give an example of a chemical change.
Burning of wood
Cutting paper
Mixing salt and water
Melting ice
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the role of energy in physical and chemical changes.
Energy has no role in physical and chemical changes
Energy only affects the color of the substances involved
Energy provides activation energy and influences the speed and direction of the change.
Energy is only important in physical changes, not chemical changes
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you reverse a physical change?
By ignoring the change and leaving it as it is
By applying the same conditions or forces that caused the change
By adding more of the substance that caused the change
By applying opposite conditions or forces that caused the change
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you reverse a chemical change?
By using a chemical reaction that can reverse the original reaction.
By heating the substance even more
By adding more of the original chemicals
By diluting the substance with water
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the composition of a substance during a physical change?
It turns into a completely different substance
It remains the same
It becomes a gas
It becomes a solid
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