Review of Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same. Examples include melting, freezing, and dissolving.

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 cooking.

Front

What happens to particles during a physical change?

Back

During a physical change, the particles may change their arrangement or state (solid, liquid, gas) but do not change their chemical structure.

Front

What happens to particles during a chemical change?

Back

During a chemical change, the particles rearrange to form new substances with different properties.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake, where ingredients react to form a new substance.

Front

How can you tell if a chemical change has occurred?

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Signs of a chemical change include color change, temperature change, gas production (bubbles), and the formation of a precipitate (solid).

Front

What is the role of heat in chemical changes?

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Heat can provide the energy needed for a chemical reaction to occur, often resulting in a temperature change.

Front

What happens to water particles when they are heated?

Back

When water is heated, its particles gain energy, move faster, and spread further apart, transitioning from liquid to gas.

Front

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

Back

A physical change alters the form of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.