Chemical and Physical 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. Examples include baking a cake, rusting of iron, and burning wood.

Front

What happens to molecules in a solid?

Back

In a solid, molecules are closely packed together and vibrate in place, which gives solids a definite shape and volume.

Front

What happens to molecules in a liquid?

Back

In a liquid, molecules are close together but can move past one another, allowing liquids to take the shape of their container while maintaining a definite volume.

Front

What happens to molecules in a gas?

Back

In a gas, molecules are far apart and move freely and rapidly, filling the entire space of their container.

Front

Give an example of a physical change.

Back

An example of a physical change is splitting a chocolate bar.

Front

Give an example of a chemical change.

Back

An example of a chemical change is baking a cake.

Front

What is the state of matter where molecules are barely moving?

Back

The state of matter where molecules are barely moving is a solid.

Front

What is the state of matter where molecules move in a crazy, no patterned way?

Back

The state of matter where molecules move in a crazy, no patterned way is a gas.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.