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 freezing, melting, and dissolving.

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances with different properties. Examples include burning, rusting, and cooking.

Front

Is freezing juice a physical or chemical change?

Back

Freezing juice is a physical change.

Front

What happens during a chemical change?

Back

During a chemical change, the molecules of one substance are rearranged to form a different substance.

Front

Which of the following is a chemical change: bending, burning, freezing, or shredding?

Back

Burning is a chemical change.

Front

What is a sign of a chemical change?

Back

A change in color or smell is a sign of a chemical change.

Front

What happens to wood when it burns?

Back

When wood burns, it undergoes a chemical change, producing heat and ashes.

Front

How do chefs use physical changes in cooking?

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Chefs use physical changes, such as rolling out a pie crust, which alters the shape but not the chemical composition of the ingredients.

Front

What is an example of a physical change in the kitchen?

Back

An example of a physical change in the kitchen is chopping vegetables.

Front

What is an example of a chemical change in cooking?

Back

An example of a chemical change in cooking is baking bread, where ingredients react to form new substances.