1. All matter emits different amounts of energy.
a) Draw below how the particles of a solid and a liquid are arranged.
b) Give two properties of a gas:
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c) Complete the paragraph below using the words provided.
conduction convection insulators conductors cold radiation metals gases hot
Heat moves through solids by _____________. Heat travels from the ___________ to the __________ part of the solid. Metals are good ______________. Gases are good ____________ .
2. A family has just moved into an old house. It has no double glazing.
a) How could not having double glazing lose the family money?
b) They decide to put in double glazing. The installation costs them £2,700 but they’re told that they can save £135 per year on their energy bill. How long will their payback take?
c) They’re now considering installing solar panels. Provide one advantage and one disadvantage of solar panels.
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ANSWERS

1.

a) The particles for the solid should be tightly packed in a pattern. The particles for the liquid should be a little further apart and not in a regular pattern.
b) Gases can flow into containers and completely fill them.
Their particles are moving all over the place in every direction
Gases can be squashed and compressed.
Their particles have extra space to move into as they’re so far apart from each other.
c) Heat moves through solids by conduction. Heat travels from the cold to the hot part of the solid. Metals are good conductors. Gases are insulators.
2.

a) Energy which should heat up the house is lost into the surroundings.
b) 2700 / 135 = 20 years
c) Advantages include:
– It’s a renewable source of energy
– No pollution is caused
Disadvantages include:
– They’re much more effective in sunny regions
– A conventional boiler might needed as well
– Solar panels don’t function at night