Shit with temperature

Question 1

Specific heat capacity

Answer 1

Tells us amount of energy needed to raise temp of 1kg of a material by 1°C

Question 2

Unit for specific heat capacity

Answer 2

J/Kg°C

Question 3

How to find the change in thermal energy of a material?

Answer 3

Mass (kg) x specific heat capacity x temperature change (°C)

Question 4

What practical fits with this topic?

Answer 4

Measuring the specific heat capacity of a metrical eg vegetable oil

Question 5

Step 1 of specific heat capacity practical

Answer 5

Place beaker on a balance and press 0

Question 6

Step 2

Answer 6

Add oil to beaker + record mass of the material

Question 7

Step 3

Answer 7

Place thermometer and immersion heater into the oil

Question 8

Step 4

Answer 8

Measure starting temp of the oil

Question 9

Step 5

Answer 9

Wrap beaker in insulating foam to reduce thermal energy transfer to surroundings

Question 10

Step 6

Answer 10

Connect joule meter to immersion heater with a powerpack to see how many joules of electrons pass into the heater

Question 11

Step 7

Answer 11

Leave set up for 30 mins

Question 12

Step 8

Answer 12

Read final temperature of the oil and final number of joules passed into immersion heater

Question 13

Step 9

Answer 13

Calculate specific heat capacity using equation:
Change in thermal energy / (mass x temp change)

Question 14

Sources of inaccuracy for the practical

Answer 14

Thermal energy could pass out of beaker into air = not accurate reading of energy
Not all thermal energy passing into oil
Incorrect reading temp
Thermal energy not spreading through the oil

Question 15

How to lessen inaccuracies in the practical

Answer 15

Use insulator such as plastic for lower thermal conductivity
Ensure heater is fully submerged
Use elec temp probe not regulate thermometer
Stir oil regularly

Question 16

Internal energy

Answer 16

Energy stored in a system by the particles
Includes kinetic energy and potential energy

Question 17

Does temp increase when it’s changing state?

Answer 17

NO because the energy we are putting in is using to break the forces of attraction between particles

Question 18

Latent heat

Answer 18

Energy required to change state of 1kg of the substance BUT with NO change in temperature

Question 19

Specific latent heat of fusion

Answer 19

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

Question 20

Specific latent heat of vaporisation

Answer 20

The energy required to change 1kg of a substance from liquid to vapour/gas with no change in temp

Question 21

How to find specific latent heat?

Answer 21

Energy for a change of state
——————————————
Mass