Conduction, Convection and Radiation

Question 1

Poor conductors are called/ used for

Answer 1

insulating

Question 2

What’s good at conducting

Answer 2

Meatal

Question 3

Is air a good or poor conductor of heat

Answer 3

It’s a poor conductor

Question 4

How does conduction happen?

Answer 4

When the substance is heated the atoms start to vibrate and bump into other particles.
They share that energy and the other particles heat up and so on

Question 5

What is convection?

Answer 5

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy

Question 6

Can convection happen is solids?

Answer 6

NO

Question 7

Convection (how to)

Answer 7

Place a beaker with water and potassium permanganate crystals over heat
The crystals will dissolve
You’ll see that the purple will go up and to the sides (like a rip current)
Eventually it’ll all be purple

Question 8

The only way heat can travel through a vacuum is_______

Answer 8

Thermal radiation

Question 9

What colour does to thermal radiation

Answer 9

Black - good absorber- good emitter
Dull/dark - reasonable absorber - reasonable emitter
White - poor absorber - poor emitter
Shiny - very poor absorber - very poor emitter
(reflects it)

Question 10

Demonstrating radiation

Answer 10

1. Take 2 conical flasks one painted silver and one black, place thermometers and bungs in them
2. Measure and record their initial temp
3. Place the 2 flasks an equal distance away from an incandescent light bulb switch it on
4. After a few mins (2-5) switch the bulb off and record the new temp
5. black will be higher

Question 11

Demonstrating emission of thermal radiation

Answer 11

1. Take 1 black and 1 shiny beaker
2. Fill each one with boiling water
3. Once each beaker reach’s a set temp (e.g. 90°C) start a stopwatch and allow it to cool for a set amount of time (e.g. 10mins)
4. After the time record the new temp
5. The black will be cooler than the shiny one