G Chem Practice Flashcard Matter

Front

What is water vapor?

Back

Water vapor is a gas.

Front

What is the temperature at which a solid begins to liquefy?

Back

The temperature at which a solid begins to liquefy is called the melting point.

Front

What is the amount of energy needed to change a substance from solid to liquid?

Back

The amount of energy needed to change a substance from solid to liquid is called the heat of fusion.

Front

How do particle movements change over time in a substance?

Back

As time goes on, the particles in a substance move faster.

Front

Is sharpening a pencil a physical or chemical change?

Back

Sharpening a pencil is a physical change.

Front

What is the boiling point?

Back

The boiling point is the temperature at which a liquid turns into a gas.

Front

What is the freezing point?

Back

The freezing point is the temperature at which a liquid turns into a solid.

Front

What is heat of vaporization?

Back

Heat of vaporization is the amount of energy required to convert a liquid into a gas at its boiling point.

Front

What is the difference between physical and chemical changes?

Back

Physical changes alter the form of a substance but not its chemical composition, while chemical changes result in the formation of new substances.

Front

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

Back

The temperature of a substance remains constant during a phase change.