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- 1. Multiple Choice
Metals are useful materials in that they are good conductors of heat and electricity. Metals that can be changed to meet specific needs. All of the following changes to a metal are physical changes except -
bending
melting
rusting
polishing
- 2. Multiple Choice
An older bicycle shows wear and tear. Which of the following signs show that a chemical change has occurred to the bicycle?
rust on the wheel
broken light
torn seat cover
bent handle bar
- 3. Multiple Choice
In the laboratory, a blue liquid is mixed with a yellow liquid. What would be the best evidence that a chemical change took place as the liquids were mixed?
The new liquid is green.
The yellow liquid floats on top of the blue.
The formation of a gas.
No change in the temperature of the new solution.
- 4. Multiple Choice
Which of the following is an example of a chemical change?
grinding salt crystals to a powder
the evaporation of water from a mud puddle
ice melting in a glass
burning wood in a campfire
- 5. Multiple Choice
All of the following are evidences of a chemical change except -
a change in temperature
the production of a gas
a change in state of matter
an odor being given off
- 6. Multiple Choice
Every chemical change results in -
a change in temperature.
the formation of a new substance.
a color change.
the formation of a precipitate.
- 7. Multiple Choice
The precipitate formed in the reaction is evidence of a chemical change because -
a new substance has been formed.
a change in the state of matter has occurred.
a color change has taken place.
a change in temperature has taken place.
- 8. Multiple Choice
During digestion the body uses both physical and chemical changes to move and process food. Which of the following is an example of a physical change?
Teeth breaking food down into smaller pieces.
Protein breaking down into amino acids in the stomach.
Enzymes breaking down carbohydrates into simple sugars.
Hydrochloric acid breaking down fats in the stomach.
- 9. Multiple Choice
Evidence of a chemical change can be observed when -
a solid melts into a liquid.
cookies are crumbled.
a drink is poured from a can to a cup.
a banana turns brown after being cut.
- 10. Multiple Choice
Which of the following is NOT evidence of a chemical change?
the temperature changes
a gas forms
a precipitate forms
a state of matter change happens
- 11. Multiple Choice
Which of the following is an example of both a physical and a chemical change?
chopping vegetables with a knife
burning a candle
dissolving hot cocoa mix in water
pouring cold water on a hot object
- 12. Multiple Choice
When two liquids are mixed, the container feels cold to the touch. This is evidence of what?
physical change
chemical change
state of matter change
no change
- 13. Multiple Choice
Which of the following would indicate the formation of a new substance?
A liquid turns to a solid.
A sample of metal melts.
Bubbles and fizzing occur.
A solid dissolves in a liquid.
- 14. Multiple Choice
Which of the following is an example of a physical change?
an explosion
a solid stays a solid
a piece of paper is crumpled
two liquids are mixed and it warms up
- 15. Multiple Choice
Which of the following is an example of a physical change in your home?
frying an egg
lighting a birthday candle
cooking a pizza in the oven
a light bulb is hot after being on for a while
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