Understanding Chemical and Physical Changes

What is a chemical change?

• A change where no new substance is made

• A change where a new substance is made

• A change that can be easily reversed

• A change that involves only physical properties.

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What question can scientists ask to determine if a chemical change has occurred?

• Was the substance formed present before?

• Did the temperature change?

• Is the change reversible?

• Did the color change?

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Which of the following is an example of a chemical change?

• Water turning to ice

• Burning a candle

• Melting chocolate

• Breaking a glass

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Which of the following is NOT a characteristic of a chemical change?

• A) New substance is formed

• B) Change in color

• C) Easily reversible

• D) Production of gas

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Fill in the blank: If you notice bubbles being formed, there is a good chance a ______ change has taken place.

• A) physical

• B) chemical

• C) reversible

• D) temporary

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NGSS.MS-PS1-2

Which of the following is a sign of a chemical change?

• Change in shape

• Change in temperature

• Change in size

• Change in state

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NGSS.MS-PS1-2

Fill in the blank: Since chemical changes make new substances, most of them cannot easily be ______.

• observed

• reversed

• started

• measured

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Fill in the blank: When you burn wood, you can't really turn the gases back into a ______ very easily.

• liquid

• log

• metal

• powder

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What is an example of a chemical change that is difficult to spot?

• Water freezing

• A nail rusting

• Chocolate melting

• Glass shattering

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NGSS.MS-PS1-2

What happens when sugar is dissolved in water and then the water is evaporated?

• Sugar disappears

• Sugar crystals are left behind

• Water turns into sugar

• Sugar turns into water

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