CHEM: Lesson 6

Matter is made up of particles that are constantly moving.

• True

• False

The temperature of a substance is a measure of the average kinetic energy of the particles.

• True

• False

A change in phase may occur when the energy of the particles is left unchanged.

• True

• False

Answer explanation

A change in phase may occur when the energy of the particles is changed.

There are spaces between particles of matter. The average amount of empty space between molecules gets progressively larger as a sample of matter moves from the solid to the liquid and gas phases.

• True

• False

There are attractive forces between atoms/molecules, and these become stronger as the particles move away from each other. These attractive forces are called intermolecular forces.

• True

• False

Answer explanation

There are attractive forces between atoms/molecules, and these become stronger as the particles move closer together. These attractive forces are called intermolecular forces.

All particles have energy, but the energy varies depending on the temperature the sample of matter is in. This in turn determines whether the substance exists in the solid, liquid, or gaseous state. Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy.

• True

• False

• Its particles possess only a small amount of kinetic energy. 

• Solids

• Liquids

• Diffusion

• The particles are always in motion, however, the motion will be so minuscule that we can say that they are simply vibrating in position.

• Solids

• Liquids

• Diffusion

• Thus, Its particles will have a very ordered structure. 

• They have a definite shape, a definite volume and are not easily compressed.

• Solids

• Liquids

• Diffusion

• Its particles possess a greater amount of kinetic energy than the particles of a solid.

• Solids

• Liquids

• Diffusion