Science physical and chemical change

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 burning, rusting, and cooking.

Front

What happens to chocolate when it melts?

Back

Melting chocolate is a physical change because the chocolate retains its chemical composition.

Front

What is the direction of heat transfer?

Back

Heat moves from hot to cold.

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids and gases) caused by differences in temperature.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves, such as sunlight.

Front

What happens when wood burns?

Back

When wood burns, a chemical change takes place, resulting in ash, smoke, and gases.

Front

What is an example of convection in water?

Back

Hot water rises and cold water sinks, creating a convection current.

Front

What is an example of conduction in cooking?

Back

Using a metal spoon to stir hot soup is an example of conduction.