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Chemical Changes
Test Description: Unit 8
Instructions: Answer all questions to get your test result.
1) When a new substance is formed
A
Chemical change
B
Fireworks
C
Energy
D
Physical change
2) An example of a chemical change
A
Physical change
B
Energy
C
Chemical change
D
Fireworks
3) This can be released during a chemical change
A
Physical change
B
Energy
C
Fireworks
D
Chemical change
4) To make different without changing what the material is made of, such as cutting, folding, or melting
A
Chemical change
B
Fireworks
C
Energy
D
Physical change
5) A _______________________ causes the formation of a new substance.
A
density
B
metal
C
chemical reaction
D
color
6) Rain can cause ________ to form on a metal swing set.
A
rust
B
metal
C
density
D
color
7) Rust occurs because of the _________ being exposed to moisture over a long period of time
A
rust
B
density
C
chemical reaction
D
metal
8) Question 2 Two items are combined inside a balloon. The balloon is tied shut. What observation would indicate that mixing the chemical produced a gas?
A
The balloon can hold a liquid.
B
The balloon increases in volume.
C
The balloon was tied shut.
D
The balloon becomes cold.
9) Students heat a white solid in a test tube over a flame. What observation would tell the students that the solid has become a new substance?
A
The solid begins to melt within the test tube.
B
The solid is in the form of crystals.
C
The color of the solid changes to amber.
D
the temperature of the solid increases.
10) A liquid and a solid are combined to form a mixture. Which procedure would most likely produce evidence that a chemical change occurs?
A
Record the temperature of the substances before and after mixing.
B
Observe the color both of the liquid and the solid before mixing.
C
Measure the volume of the mixture after the components were combined.
D
Determine the time it took for the liquids to combine completely.
11) Two clear substances are combined inside a plastic bag. The plastic bag is tightly sealed. What observation would indicate that mixing the chemical produced a new substance?
A
the bag is transparent.
B
The substances are clear.
C
The substance in the bag becomes warm.
D
The bag can hold a liquid.
*select an answer for all questions
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