P2: Energy Transfers By Heating

Question 1

What practical can be done to figure out how well certain materials conduct heat?

Answer 1

A practical in which different material rods are placed with one end over the bunsen burner and the other end with vaseline and a pin on.

Whichever material conducts heat from one side of the rod to the other fastests will melt the vaseline first and therefore the pin will drop first.

Question 2

What is thermal conductivity?

Answer 2

Thermal conductivity of a material refers to the rate at which it transfers energy.

Question 3

What is insulation?

Answer 3

Insulation means to reduce the amount of energy transfer across a material

Question 4

What are the 2 main factors which affect the rate of heat transfer across a material?

Answer 4

• How thick the material is
• The type of material (if it is a good or bad conductor of heat)

Question 5

What is the difference between heat and temprature?

Answer 5

Heat is the amount of energy stored in an object or substance,

temprature is the measure of how hot or cold something is due to the amount of energy stored in a substance.

Question 6

What is infared radiation?

Answer 6

A type of electromagnetic wave which transfers heat energy.

Question 7

What is specific heat capacity?

Answer 7

A property of a material that determines how much energy is required to raise the temprature of 1kg of material by 1°C

Question 8

What is a heat insulator?

Answer 8

Insulators are poor conductors of heat so this means that the heat isn’t easily transferred away. An insulator doesn’t transfer heat very well, which means it stays where it is for longer.

Question 9

What are 2 different ways of insulation a home?

Answer 9

• Cavity wall and loft insulation
• Double window glazing