Chemical vs Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more new substances are formed, often accompanied by energy 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.

Front

Is burning wood a physical or chemical change?

Back

Chemical change.

Front

Is melting ice a physical or chemical change?

Back

Physical change.

Front

What happens to the substances in a chemical change?

Back

The original substances are transformed into new substances with different properties.

Front

What is an example of a chemical change?

Back

Rust forming on iron.

Front

What is an example of a physical change?

Back

Dissolving sugar in water.

Front

How can you tell a chemical change has occurred?

Back

Signs include color change, gas production, temperature change, and formation of a precipitate.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

Is cooking an egg a physical or chemical change?

Back

Chemical change.