8th Grade Unit #3 Molecules in Motion

Front

What is the main difference between solids and liquids?

Back

Solids have a definite shape, while liquids do not.

Front

What determines the temperature of a substance?

Back

The speed of the molecules determines the temperature.

Front

What happens to the particles in a solid when it is heated?

Back

The particles move faster.

Front

Does air have mass?

Back

Yes, air has mass.

Front

What causes food coloring to spread in water?

Back

Water molecules are in motion.

Front

Define 'molecule'.

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties.

Front

What is the state of matter with a definite volume but no definite shape?

Back

Liquid.

Front

What happens to the density of a substance when it is heated?

Back

Generally, the density decreases as the substance expands.

Front

What is the term for the movement of molecules from an area of high concentration to an area of low concentration?

Back

Diffusion.

Front

What is the relationship between temperature and molecular motion?

Back

As temperature increases, molecular motion increases.