P14 P15

Question 1

Describe the 3 states of matters in terms of movement and arrangement of particles and densities

Answer 1

Solids are packed as tight as possible and in a regular arrangement , particles vibrate on their fixed position –highest density

In liquids the particles are randomly arranged and the particles slowly move past each other

In gasses there are no arrangement in particles and the particles move quickly and randomly with loads of energy - lowest density

Question 2

What is specific heat capacity and what is specific latent heat

Answer 2

Specific heat capacity - Amount of Energy required to increase the temperature of 1KG of substance by 1 degree Celsius

Specific latent heat - Amount of energy required to change the state of 1kg of substance with no temperature change

Question 3

Formula for change in thermal energy

Answer 3

Q = M x C x change in temp

Change in thermal energy = mass x Specific heat capacity x change in temperature

Question 4

Formula for thermal energy for a change of state

Answer 4

Q = M x L

Thermal energy for a change of state = mass x specific latent heat

Question 5

Effect on changing temperature of gas in terms of velocity of particles

Answer 5

The higher the temperature , the higher the kinetic energy so the particles will move faster and collide into each other with more force

Question 6

What is absolute zero

Answer 6

it is -273 degree Celsius

there is no movement of particles as they have no more energy left to loose

Question 7

Convert from degrees to kelvin

Answer 7

If we want to get to kelvin we add 273

if we want to get t degrees we subtract 273

Question 8

What effect does changing volume of gas have on the pressure

Answer 8

If the volume is decreased the pressure will increase because the particles will collide more frequently in a smaller volume - vice versa