Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change in the state or appearance of a substance without altering its chemical composition. Examples include melting ice or breaking a glass.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or burning wood.

Front

What happens to the particles in a solid when it melts?

Back

When a solid melts, its particles gain thermal energy, move faster, and begin to break free from their fixed positions, turning into a liquid.

Front

What is thermal energy?

Back

Thermal energy is the energy that comes from the temperature of matter. It is the total energy of the particles in a substance.

Front

What state of matter has a definite shape and volume?

Back

Solid.

Front

What state of matter has a definite volume but takes the shape of its container?

Back

Liquid.

Front

What state of matter has no definite shape or volume?

Back

Gas.

Front

What is an example of a physical change?

Back

An example of a physical change is freezing water to make ice.

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 product.

Front

What happens to sugar when it dissolves in water?

Back

When sugar dissolves in water, its particles separate and spread out evenly throughout the water, forming a solution.