Physical vs 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 are some indicators of a chemical change?

Back

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

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change.

Front

What is an example of a physical change?

Back

Dissolving sugar in water is an example of a physical change.

Front

How does temperature change relate to chemical changes?

Back

A temperature change can indicate a chemical change, as energy is either absorbed or released during the breaking or forming of chemical bonds.

Front

What happens to chemical bonds during a chemical change?

Back

During a chemical change, chemical bonds are broken and new bonds are formed, resulting in the creation of new substances.

Front

Can a physical change be reversed?

Back

Many physical changes are reversible, such as freezing and melting, but some may not be easily reversible.

Front

What is the law of conservation of mass in relation to 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.

Front

What is a precipitate, and how does it indicate a chemical change?

Back

A precipitate is a solid that forms from a solution during a chemical reaction, indicating that a chemical change has occurred.

Front

What role does energy play in chemical changes?

Back

Energy is involved in chemical changes as it is required to break bonds and is released when new bonds form.