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. Examples include rusting, burning, and cooking.

Front

What happens to the thermal energy during freezing?

Back

During freezing, thermal energy is removed from the liquid, causing it to change into a solid.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust).

Front

What is an example of a liquid turning into a gas?

Back

An example of a liquid turning into a gas is water evaporating into steam.

Front

Why is ice melting considered a physical change?

Back

Ice melting is considered a physical change because it changes from solid to liquid without creating a new substance.

Front

What is the process of dissolving?

Back

Dissolving is the process where a solute (like sugar) mixes with a solvent (like water) to form a solution.

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

Back

A physical change does not create a new substance, while a chemical change does.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but their chemical structure remains the same.