Chemical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

Front

What are some signs of a chemical change?

Back

Signs include temperature change, formation of a gas, color change, and formation of a precipitate.

Front

What is a precipitate?

Back

A solid that forms when two liquids react together.

Front

What indicates a chemical change?

Back

A temperature change is one of the indicators of a chemical change.

Front

What is NOT evidence of a chemical change?

Back

Melting is not evidence of a chemical change; it is a physical change.

Front

What happens during a chemical reaction?

Back

New substances are formed, and the original substances may change in appearance and properties.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

Can a chemical change be reversed?

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Most chemical changes are not easily reversible, unlike physical changes.

Front

What is an example of a chemical change?

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Burning wood is a chemical change because it produces ash, smoke, and gases.

Front

What is the role of energy in chemical changes?

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Energy is often absorbed or released during a chemical change, affecting temperature and reaction rates.