Physical vs 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. It involves a chemical reaction and includes processes like burning, rusting, and digestion.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes the formation of a new substance, color change, gas production, temperature change, and precipitate formation.

Front

Is breaking a pencil a chemical change?

Back

No, breaking a pencil is a physical change because it does not change the chemical composition of the pencil.

Front

What happens during a chemical reaction?

Back

During a chemical reaction, reactants are transformed into products, resulting in the formation of new substances with different properties.

Front

What is an example of a physical change?

Back

Examples of physical changes include crumpling paper, melting ice, and sharpening a pencil.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include burning wood, rusting iron, and souring milk.

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.

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.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.