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 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 chemical composition of the substance. Examples include frying an egg and rusting iron.

Front

Is frying an egg a physical or chemical change?

Back

Frying an egg is a chemical change because it involves a chemical reaction that transforms the egg into a different substance.

Front

Is making Kool-Aid a physical or chemical change?

Back

Making Kool-Aid is a physical change because it involves mixing water and powder without changing the chemical composition of the substances.

Front

Is melting an ice cube a physical or chemical change?

Back

Melting an ice cube is a physical change because it changes the state of water from solid to liquid without altering its chemical composition.

Front

Is melting butter for popcorn a physical or chemical change?

Back

Melting butter for popcorn is a physical change because it changes the state of butter from solid to liquid without changing its chemical composition.

Front

Is mixing paint a physical or chemical change?

Back

Mixing paint is a physical change because it combines different colors without creating new chemical substances.

Front

What are some indicators of a chemical change?

Back

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

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules are rearranged to form new substances with different properties.