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自然科學
國小五六年級
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1
Which of the following is an example of a physical change?
A
Rusting of an iron nail
B
Burning a piece of paper
C
Baking a cake
D
Melting an ice cube
2
When a solid changes to a liquid, how does the arrangement of particles change?
A
Particles become less tightly packed and can move past each other
B
Particles become more tightly packed and ordered
C
Particles combine to form new substances
D
Particles break apart into smaller particles
3
Which statement best distinguishes a physical change from a chemical change?
A
A physical change is reversible, while a chemical change is not.
B
A physical change does not produce a new substance, while a chemical change does.
C
A physical change always involves a change in state, while a chemical change does not.
D
A physical change releases energy, while a chemical change absorbs energy.
4
A student observes that when a white powder is added to water, it dissolves and the water becomes clear. After stirring, no new substance is formed. How should this change be classified?
A
Chemical change, because the water became clear
B
Chemical change, because the powder disappeared
C
Physical change, because no new substance is formed
D
Physical change, because the powder dissolved
5
A student claims that burning a candle is a physical change because the candle wax melts. Which evidence would best justify that burning is actually a chemical change?
A
New substances like carbon dioxide and water vapor are produced.
B
The candle gets shorter as it burns.
C
The candle gives off heat and light.
D
The candle wax changes from solid to liquid.