Topic 3 - Particle Model Of Matter Flashcards
Density =
Mass/volume
What are the three states of matter?
Solid, liquid, gas
What are the forces of attraction like in solids?
Strong
What are the forces of attraction like in liquids?
Weak
What are the forces of attraction like in gases?
Almost non-existent
Which state of matter generally has the highest density?
Solids
What is internal energy?
The energy stored by particles in a system
What types of energy can internal energy be?
Kinetic and potential
Solid to liquid
Melting
Liquid to solid
Freezing
Liquid to gas
Boiling/ evaporating
Gas to liquid
Condensing
Solid to gas
Sublimation
Is changing state a physical or chemical change?
Physical
Does mass chance in change of state?
No
Do the number of particles change in change of state
No
On a time temperature graph of a substance, what do the gradients represent?
Heating up
On a time temperature graph of a substance, what do the flat parts represent?
Melting and boiling points
Why does the temperature temporarily stop rising when the substance reaches its melting or boiling point?
Because the energy is going into breaking the intermolecular bonds rather than into changing the temperature
What is latent heat?
The energy needed to change the state of a substance
What is the specific latent heat of a substance?
The amount of energy needed to change the state for 1kg
The specific latent heat for changing between solid and liquid is called…
Specific latent heat of fusion
The specific latent heat for changing between liquid and gas is called…
Specific latent heat of vaporisation
Specific latent heat =
Energy/mass
