t3 test

Question 1

density equation

Answer 1

density = mass / volume

Question 2

mass, volume, density

Answer 2

kg
m^3
kg/m^3

Question 3

The internal energy of the air increases as the tyre is
inflated.

explain why

Answer 3

work is done in the
tyre

so the temperature
increases

Question 4

If the gas is compressed too
quickly the temperature of the gas increases.

Explain how the temperature
increase would affect the
pressure exerted by the gas.

Answer 4

a temperature increase would increase the pressure in the tube

higher temperature
would mean higher kinetic energy of particles

Question 5

polystryene

Answer 5

solid, low density, very open structure and is full of air spaces

small mass for its volume

Question 6

specific heat capacity

Answer 6

amount of energy required to raise the temp of 1kg of a substance by 1C

Question 7

change in energy

Answer 7

Change in energy (J) = mass (kg) x SHC (J/kgC) x change in temperature (C)

Question 8

specific latent heat

Answer 8

energy needed to change the state of 1kg of a substance

Question 9

energy equation

Answer 9

Energy (j) = mass (kg) x specific latent heat (J/kg)

Question 10

specific latent heat of fusion

Answer 10

energy required to change 1kg of a substance from solid to liquid with no change in temp

Question 11

energy for change of state

Answer 11

= mass x SLH

Question 12

solids

Answer 12

• particles are very close together
• arranged in a regular pattern
• vibrate but don’t move place to place
• v high density as particles are packed closely, lot of mass for their volume

Question 13

liquids

Answer 13

• close together
• can move around each other
• high density since particles are close together, lot of mass for their volume

Question 14

gases

Answer 14

• particles very far apart
• not arranged in any pattern
• in constant random motion
• low density as particles are very far apart so have a small mass for their volume

Question 15

displacement reaction

Answer 15

• fill a eureka can with water
• place object into water, water becomes displaced and flows out of the can through the spout
• measure the volume of water displaced
• volume is the same as the volume of the object

Question 16

internal energy

Answer 16

energy stored in a system by the particles

Question 17

what does internal energy include

Answer 17

KE of particles and potential energy of the particles

Question 18

work

Answer 18

transfer of energy by a force

Question 19

why physical changes

Answer 19

reversing changes makes the material recover original properties