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 ice or tearing paper.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or burning wood.

Front

Can you name an example of a physical change?

Back

An example of a physical change is freezing water to make ice.

Front

Can you name an example of a chemical change?

Back

An example of a chemical change is baking a cake.

Front

What happens to the substance in a physical change?

Back

In a physical change, the substance remains the same at the molecular level, even though its form may change.

Front

What happens to the substance in a chemical change?

Back

In a chemical change, the original substance is transformed into one or more new substances with different properties.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change because it produces ash, smoke, and gases, which are different substances.

Front

What is an indicator of a chemical change?

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An indicator of a chemical change can include color change, temperature change, gas production, or the formation of a precipitate.

Front

What is an example of a reversible physical change?

Back

An example of a reversible physical change is melting and freezing water.