U3M1L1: Particles in Motion

Front

What is the purpose of expansion joints in highway bridges?

Back

To allow the highway to expand or contract with temperature changes without damaging the bridge.

Front

Which state of matter is characterized by closely packed particles that vibrate in place?

Back

Solid.

Front

What happens to a liquid in a thermometer when it is warmed?

Back

The liquid expands.

Front

What is the process called when substances move from an area of higher concentration to an area of lower concentration?

Back

Diffusion.

Front

What type of change occurs when water bubbles form throughout the liquid and rise to the top on a hot stove?

Back

Boiling.

Front

What is kinetic energy?

Back

The energy of motion, which is present in moving particles.

Front

What is the difference between evaporation and boiling?

Back

Evaporation occurs at the surface of a liquid at any temperature, while boiling occurs throughout the liquid at a specific temperature.

Front

What is the definition of temperature?

Back

A measure of the average kinetic energy of the particles in a substance.

Front

What happens to the particles in a gas when it is cooled?

Back

The particles move closer together and slow down.

Front

What is condensation?

Back

The process by which a gas turns into a liquid.