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 changes in shape, size, or state of matter.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the chemical properties of the substance. Examples include rusting, burning, and cooking.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid without changing its chemical composition.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change because it transforms the wood into ash and smoke, creating new substances.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement or state (like solid to liquid) but remain the same substance.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules break apart and rearrange to form new substances with different properties.

Front

Give an example of a physical change in nature.

Back

An example of a physical change in nature is the water cycle, where water evaporates, condenses, and precipitates without changing its chemical structure.

Front

Give an example of a chemical change in cooking.

Back

An example of a chemical change in cooking is baking a cake, where the ingredients undergo a chemical reaction to form a new product.

Front

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

Back

The main difference is that a physical change does not create new substances, while a chemical change does.

Front

Is cutting paper a physical or chemical change?

Back

Cutting paper is a physical change because the paper's composition remains the same despite its size changing.