Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and breaking.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the composition of the original substance. Examples include burning, rusting, and frying an egg.

Front

Is melting ice cream a physical or chemical change?

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Melting ice cream is a physical change because it changes from solid to liquid without changing its chemical composition.

Front

Is frying an egg a physical or chemical change?

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Frying an egg is a chemical change because it involves a chemical reaction that changes the egg's composition.

Front

What happens during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What is an example of a physical change?

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An example of a physical change is glass breaking. The glass changes shape but remains glass.

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What is an example of a chemical change?

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An example of a chemical change is corroding metal, which forms rust and changes the metal's composition.

Front

What are some indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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Can a physical change be reversed?

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Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible.

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Can a chemical change be reversed?

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Chemical changes are often not reversible by simple physical means, as they result in new substances.