Topic P3 - Particle Model Of Matter

Question 1

What is density?

Answer 1

Density is a measure of the ‘compactness’ of a substance.

Question 2

What is the units of density?

Answer 2

The units of density are kg/m cubed. (The mass is in kg and the volume is in m cubed)

Question 3

What does the density of an object depend on?

Answer 3

It depends on what it is made of and how the particles are arranged

Question 4

What is internal energy?

Answer 4

Internal energy is the energy stored by the particles that make up a system

Question 5

Where is energy in a particle

Answer 5

The energy is in their kinetic energy stores

Question 6

What is the internal energy of a system?

Answer 6

The internal energy of a system is the total energy that its particles have in their kinetic and potential energy stores

Question 7

What does heating the system do?

Answer 7

By heating the system it transfers energy to its particles (they gain energy in their particle stores and move faster), increasing the internal energy

Question 8

What is specific latent heat?

Answer 8

Specific latent heat is the energy needed to change the state of a 1kg mass

Question 9

What is the specific latent heat of a substance?

Answer 9

Specific latent heat of a substance is the amount of energy needed to change the state of a 1kg mass