Ciências Anos 5–6

Gr8-W5-L3

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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

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

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.

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

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.

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