Topic 3 - Particle Model of Matter

Question 1

Change in Thermal Energy

Answer 1

The product of the mass, specific heat capacity and
temperature change of a substance.

Question 2

Chemical Changes

Answer 2

Changes to the chemical structure of a substance. The
substance does not usually restore its original properties when the changes are
reversed.

Question 3

Internal Energy

Answer 3

The energy stored by the atoms and molecules that make up a
system. It is equal to the sum of the total kinetic and potential energies of the
particles in the system.

Question 4

Latent Heat

Answer 4

The energy required for a substance to change state.

Question 5

Pascals

Answer 5

The unit of pressure, equal to a force of one Newton acting
perpendicular to an area of one metre squared.

Question 6

Sublimation

Answer 6

The direct changing of a substance from a solid state to a vapour
state, without passing through the liquid phase.

Question 7

Physical Changes

Answer 7

Changes to the physical properties of a substance which can
be reversed. Changes of state are physical changes since substances can restore
their original properties when the changes are reversed.