Chemical vs. Physical Changes

Front

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

Back

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

Front

What is an example of a physical change?

Back

Blending fruits together is an example of a physical change.

Front

What is an example of a chemical change?

Back

The spoiling of milk is an example of a chemical change.

Front

How can you identify hydrogen gas during a flame test?

Back

Hydrogen gas can be identified by a characteristic 'pop' sound when ignited.

Front

What happens to gallium when it is heated?

Back

Gallium melts into a puddle of liquid metal, demonstrating a physical change.

Front

What is a common indicator of a chemical change?

Back

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

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?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is an example of a physical change that involves a state change?

Back

Melting ice into water is an example of a physical change involving a state change.

Front

What is the role of energy in chemical changes?

Back

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