Physical and Chemical Changes

What is one chemical property of chlorine?

• has a density of 3.2 g/l

• it is a gas at room temperature

• it is yellowish

• It reacts with sodium

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112.35.c.4.A

A chemist is in a lab and mixes two substances in a test tube. He notices that a precipitate forms. What kind of change has occured?

• nuclear

• chemical

• physical

• atomic

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112.35.c.4.A

What is a physical change?

• a change in appearance or form but no new substance is created

• a change in which there is a change inside the nucleus

• a change in which there is a loss or gain of electrons

• a change in which a new substance is formed

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112.35.c.4.A

What is a chemical change?

• a change in appearance or form but no new substance has been created

• a change in which the chemical composition of matter has not changed

• a change in which a new substance is formed

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112.35.c.4.A

You are making rice and need to heat water. After a while, you notice the water has started to boil and there is water vapor. What kind of change has taken place?

• physical

• chemical

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112.35.c.4.A

Which is NOT a sign of a chemical change?

• change in color

• odor production

• gas/bubbles begin to appear

• precipitate has formed

• change in shape

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112.35.c.4.A

A solid that forms when two substances are mixed is known as what?

• precipitate

• vapor

• aqueous

• plasma

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112.35.c.4.A

Which of these observations would likely be a sign of a chemical change?

• a change in volume as a substance is heated

• a change in odor when two substances mix

• the disappearance of a liquid as it boils

• A liquid has frozen into a solid

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112.35.c.4.A

A student got a haircut before the homecoming football game. What kind of change took place?

• physical

• chemical

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112.35.c.4.A

A chain has rusted. What kind of change has taken place?

• chemical

• physical

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112.35.c.4.A