Physical and Chemical Changes

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different chemical properties.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical structure.

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change, as it involves a reaction with oxygen to form iron oxide.

Front

What happens to the temperature of a substance during a physical change?

Back

The temperature may change during a physical change, but the substance's chemical identity remains the same.

Front

What happens to the temperature of a substance during a chemical change?

Back

The temperature may change during a chemical change, and new substances with different properties are formed.

Front

What is condensation in terms of physical changes?

Back

Condensation is the process where water vapor in the air cools and changes into liquid water, demonstrating a physical change.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

What is the role of energy in chemical changes?

Back

Energy is often absorbed or released during a chemical change, which can affect the temperature and state of the substances involved.

Front

How can burning paper be classified?

Back

Burning paper is classified as a chemical change because it produces new substances (ash, smoke, gases) and involves a chemical reaction.

Front

What is the significance of the law of conservation of mass in chemical changes?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.