B2 Energy transfer by heating

Question 1

What material is the best conductor of energy

Answer 1

Metal

Question 2

Name 2 examples of non - metal materials that are great for insulating

Answer 2

Wool, fiberglass

Question 3

If a material has a higher thermal conductivity, would the rate of energy transfer through it be higher or lower?

Answer 3

Higher

Question 4

If an insulating material was thicker, would it have a higher or lower rate of energy transfer through it?

Answer 4

Lower

Question 5

What is specific heat capacity?

Answer 5

The amount of energy needed to change the temperature of 1kg of the substance by 1 degree celcius.

Question 6

What is the formula to find the amount of energy needed to raise the temp of 1kg of a material by 1 degree celcius?

Answer 6

`Energy = Mass X Specific heat capacity X Change in temperature (E = M X C X Ø)

Question 7

If an object has a greater mass, does the temperature increase quicker or slower when heated?

Answer 7

Slower

Question 8

What is the formula to find the specific heat capacity of a substance?

Answer 8

Specific heat capacity = Change in thermal energy ÷ Mass X Change in temperature
C = ΔΕ
———
mc ΔØ

Question 9

State 4 ways that the rate of energy transfer from houses be reduced.

Answer 9

Loft insulation, cavity wall insulation, double-glazed windows, aluminium foil behind windows.

Question 10

What is cavity wall insulation?

Answer 10

Insulation material that is used to fill the cavity between the two brick layers of an external house wall.