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Chemical Physical Change
Test Description: Review
Instructions: Answer all questions to get your test result.
1) A change in size or shape but no new substance created
A
Chemical Reaction
B
Physical Change
C
Chemical Change
D
Catalyst
2) A change is a substance that results in the formation of a brand new substance with new properties
A
Mixture
B
Catalyst
C
Physical change
D
Chemical Change
3) The Law of Conservation of Mass says
A
Matter can be created, but not destroyed during a chemical change
B
Matter is not created or destroyed in a chemical or physical change
C
After a chemical or physical change occurs, mass is lost
D
A chemical change results in the formation of new elements after the reaction occurs
4) An Exothermic reaction is
A
A reaction that results in a release of energy. Produces warmth
B
A reaction that results in new atoms being created
C
A reaction that results in energy being absorbed. The reaction feels cold.
D
A reaction that results in existing atoms being destroyed
5) An example of an endothermic reaction would be
A
A cold pack for a sports injury
B
Hand warmers
C
Glow stick
D
Elephant Toothpaste reaction
6) Which is NOT evidence of a chemical change
A
Aroma change
B
Fizzing
C
Bending
D
Color change
7) Which of the following is a chemical change
A
dissolving sugar in water
B
boiling water
C
a glow stick glowing
D
adding red food coloring to water
8) What happens to a substance during a physical change?
A
The molecules stay the same and their properties stay the same.
B
The molecules get smaller and the properties change
C
Molecules are broken and the elements are rearranged into new molecules
D
Molecules are destroyed and new molecules are formed
9) Two solutions are added together and the new solution becomes cold. This tells you that
A
A gas is being produced
B
Molecules are being broken apart
C
An endothermic reaction is taking place
D
An exothermic reaction is taking place
10) A pot of water is heated over a flame until bubbles form. This is an example of a
A
catalyst
B
chemical change
C
physical change
D
chemical reaction
11) Approximately how many elements are known to scientist today
A
10
B
1000000
C
100
D
1000
12) Sodium is an explosive metal and Chlorine is a toxic gas. Why are they safe to eat when they combine to make salt?
A
When the atoms join, new atoms are made that are differnent than sodium and chlorine
B
When they become a solid, they are no longer dangerous
C
The chemical reaction creates a new substance (salt) with new properties
D
Salt is toxic and will explode if you not careful
*select an answer for all questions
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