Front

What is a controlled variable in an experiment?

Back

A controlled variable is a factor that is kept constant to ensure that the results of an experiment are valid.

Front

What does pH measure?

Back

pH measures the acidity or basicity of a solution, with lower values being more acidic and higher values being more basic.

Front

What is the boiling point of a substance?

Back

The boiling point is the temperature at which a substance changes from a liquid to a gas.

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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

How many electrons can fit in the first energy level of an atom?

Back

The first energy level can hold a maximum of 2 electrons.

Front

What is the difference between a solid, liquid, and gas?

Back

Solids have a fixed shape and volume, liquids have a fixed volume but take the shape of their container, and gases have neither fixed shape nor volume.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

What happens during condensation?

Back

During condensation, a gas changes into a liquid as it cools.