Phase Changes and Conceptual Gas Laws

Front

What is melting?

Back

Melting is the phase change from solid to liquid that occurs when a substance absorbs heat energy.

Front

Where does melting occur?

Back

Melting occurs at the melting point of a substance, where solid and liquid phases coexist.

Front

What happens to air molecules in a tire when it is warmed up?

Back

Air molecules speed up and collide with the tire walls more often, increasing the pressure.

Front

What is required for all phase changes?

Back

All phase changes require energy to be added or taken away.

Front

What is Boyle's Law?

Back

Boyle's Law states that the pressure of a gas is inversely proportional to its volume at constant temperature.

Front

What happens to pressure when volume increases in a gas?

Back

When volume increases, pressure decreases, according to Boyle's Law.

Front

What are the characteristics of gases?

Back

Gases have no definite shape or volume; they expand to fill their container.

Front

What is the relationship between temperature and gas pressure?

Back

As temperature increases, the pressure of a gas also increases if the volume is held constant.

Front

What is the definition of a phase change?

Back

A phase change is a transition of matter from one state to another, such as solid, liquid, or gas.

Front

What is the significance of the melting point?

Back

The melting point is the temperature at which a solid becomes a liquid.