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

Front

What happens to iron when it rusts?

Back

When iron rusts, it undergoes a chemical reaction with oxygen and moisture in the air, forming iron oxide, which is commonly known as rust.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What is an example of a chemical change?

Back

Lighting a match is an example of a chemical change because it produces new substances such as ash and gases.

Front

What occurs during a candle burning?

Back

During a candle burning, a chemical change occurs as the wax reacts with oxygen to produce heat, light, carbon dioxide, and water.

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 an example of a physical change?

Back

Cutting a piece of paper is an example of a physical change because the paper's chemical composition remains the same.

Front

What is rusting?

Back

Rusting is a specific type of chemical change that occurs when iron reacts with oxygen and moisture, leading to the formation of rust.

Front

What happens when wood is burned?

Back

When wood is burned, it undergoes a chemical change, producing ash, smoke, and gases, which are different substances from the original wood.