Term 1 review
Answers are for parents and teachers.
1
A 0.4 kg block of iron (c = 450 J/(kg·°C)) cools by 30 °C. How much heat does it lose?
Q = 0.4 × 450 × 30 = 5400 J.
2
Convert 77 °F to °C and then to kelvin.
(77 − 32) ÷ 1.8 = 25 °C; 25 + 273 = 298 K.
3
Air holds 9 g of vapour per m³ and could hold 30 g. Find the relative humidity.
9 ÷ 30 × 100 = 30%.
4
Write a cause-and-effect chain of four steps for acid rain.
Burning fuel with sulphur releases SO₂; SO₂ is oxidised to SO₃; SO₃ dissolves in cloud water to give H₂SO₄; acid rain falls.
5
Choose one idea from this term that you want to revise and write a question about it with its answer.
Answers will vary, for example: Q: Why is the ozone layer in the stratosphere important? A: It absorbs harmful UV.