8.1.3 Chemical and Physical Changes

Front

What is a physical change?

Back

A physical change is a change in an item's properties like its shape, size, or density.

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What is reactivity in chemistry?

Back

Reactivity is the tendency of a substance to undergo a chemical reaction.

Front

How can you tell a chemical reaction has occurred when mixing substances?

Back

You can tell a chemical reaction has occurred by observing changes such as the formation of gas, color change, or temperature change.

Front

What is an example of a physical change?

Back

Dissolving sugar in water is an example of a physical change.

Front

What are the three states of matter?

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The three states of matter are solids, liquids, and gases.

Front

What happens to the properties of a substance during a physical change?

Back

The properties of a substance may change in terms of shape, size, or state, but its chemical composition remains the same.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the reaction between vinegar and baking soda, which produces carbon dioxide gas.

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

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A physical change affects the form of a substance, while a chemical change alters the substance's chemical composition.

Front

What is an indicator of a chemical reaction?

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

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.