Thermal energy is measured in joules and radiation is the heat transfer that works through a vacuum, so this Year 10 sheet opens with the energy unit and the space-bound method. The answers record metals as conductors, E = m × c × Δθ and latent heat.
Key Takeaways
The unit of thermal energy is the joule (Q1).
Radiation can travel through a vacuum (Q2).
Q5 records E = m × c × Δθ.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.What is the unit of thermal energy?
(a) joule(b) watt(c) kelvin(d) pascal
2.Which method of heat transfer can travel through a vacuum?
3.In which of these materials is conduction fastest?
(a) metals(b) gases(c) plastics(d) a vacuum
4.Convection occurs mainly in which materials?
(a) liquids and gases(b) solids(c) a vacuum(d) metals
5.Which formula is used to calculate the thermal energy needed to change the temperature of a substance?
(a) E = m × c × Δθ(b) E = m × c ÷ Δθ(c) E = c ÷ (m × Δθ)(d) E = m × Δθ
6.The energy supplied to a substance during a change of state at constant temperature is called what?
(a) latent heat(b) sensible heat(c) kinetic energy(d) work done
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.Define specific heat capacity.
8.Define specific latent heat.
9.Explain the difference between heat (thermal energy) and temperature.
10.Name the three methods of heat transfer.
11.Explain how convection currents are formed in a liquid or gas.
12.Why does the temperature of a substance stay constant during a change of state?
13.State how the colour and texture of a surface affect how well it absorbs and radiates infrared radiation.
14.State the unit of specific heat capacity.
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.2 kg of water is heated through 10 °C. Water has a specific heat capacity of 4200 J/kg °C. Using E = m × c × Δθ, calculate the energy needed.
16.5 kg of a metal with a specific heat capacity of 500 J/kg °C is heated through 20 °C. Using E = m × c × Δθ, calculate the energy needed.
17.63000 J of energy is supplied to 3 kg of water. Using Δθ = E ÷ (m × c) with c = 4200 J/kg °C, calculate the temperature rise.
18.Calculate the energy needed to melt 0.2 kg of ice. The specific latent heat of fusion of ice is 334000 J/kg and E = m × L.
19.0.3 kg of water is turned into steam. The specific latent heat of vaporisation of water is 2260000 J/kg. Using E = m × L, calculate the energy needed.
20.8400 J of energy is supplied to 0.1 kg of water. Using Δθ = E ÷ (m × c) with c = 4200 J/kg °C, calculate the temperature rise.
Answer Key
1. a) joule
2. a) radiation
3. a) metals
4. a) liquids and gases
5. a) E = m × c × Δθ
6. a) latent heat
7. Refer to solution guide.
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End of Worksheet
People Also Ask
What is the unit of thermal energy?
The joule, option (a) in this worksheet (Q1).
Which method of heat transfer works through a vacuum?
Radiation, option (a) in this worksheet (Q2).
How is heat energy calculated?
E = m × c × Δθ, option (a) in this worksheet (Q5).
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