P3: Particle Model

Question 1

Define density
Equation

Answer 1

Mass per unit volume (an object )
P= m/v
Measured in kg/m3 cubed

Question 2

Changes of state( physical changes)

Answer 2

Melting = solid to liquid
Evaporation= liquid to gas
Condensation = gas to liquid

Question 3

States of matter

Answer 3

Solid= most density, neatly arranged, vibrate at fixed positions , least ke
Liquid= can flow over eachother
Gases= particles move freely, random, lowest density, most ke

Question 4

Changes of state
Define internal energy

Answer 4

Total kinetic and potential energy of particles in system

Question 5

Changes of state
Chemical changes
Physical changes

Answer 5

Chemical changes= not reversible
Physical changes= if reversed the materials properties can be recovered

Question 6

Define sublimation

Answer 6

When solid changes to gas without becoming liquid

Question 7

Heating curves

Answer 7

Heating increases energy of particles
Increasing their internal energy
Results in :
Raises temp of system
Or change in state

Question 8

Specific heat capacity
Define

Answer 8

Amount of Energy required to raise temp of 1kg of substance to 1C (Celsius)

Question 9

Specific heat latent
Define
Equation

Answer 9

Energy needed to change state of 1kg of substance without change of state
E= mass x slh
E= m x l

Question 10

Gas pressure

Answer 10

Force acting perpendicular to a surface, per unit area

Question 11

Gas pressure
Work done
Bike pump

Answer 11

Doing work on gas transfers energy to it
Pump is compressed, work done on gas so temp increases

Question 12

Gas pressure
Equation

Answer 12

pV= constant