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S1 Science: Heat and Temperature – Conduction, Convection, Radiation and the Vacuum Flask (Paper 3: challenge)
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Tutor Prep Guide · heat against temperature, conduction convection and radiation, specific heat capacity calculations, and how a vacuum flask keeps drinks hot
S1 Science: Heat and Temperature – Conduction, Convection, Radiation and the Vacuum Flask (Paper 3: challenge)
Paper three works mixtures and specific heat comparisons, with every step checked.
Direct answers Remember one line: energy does not appear from nowhere, so total heat is conserved in a mixture.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: S1 Science: Heat and Temperature – Conduction, Convection, Radiation and the Vacuum Flask |
| Level | heat against temperature, conduction convection and radiation, specific heat capacity calculations, and how a vacuum flask keeps drinks hot |
02 Questions (10 items)
- Foundation0.2 kg of water at 80 C is mixed with 0.3 kg at 20 C. With no loss, what is the final temperature?
- Foundation0.1 kg of water at 90 C is mixed with 0.4 kg at 10 C. What is the final temperature?
- FoundationWhere must the final temperature of mixed hot and cold water lie?
- IntermediateHow much energy heats a 0.5 kg aluminium block from 20 C to 70 C? (c = 900 J/kgC)
- IntermediateThe same 10000 J heats 1 kg of water and 1 kg of aluminium. Which warms less?
- IntermediateWhy is water a good coolant?
- ChallengeHow does heat flow between two bodies in contact, and when does it stop?
- ChallengeA flask must fight all three heat paths. Which design handles which?
- ChallengeTwo identical plates differ only in area, with the same temperature difference. Which conducts faster?
- Error redoA student writes that a higher temperature always means more heat. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | About 44.0 C. | (0.2 times 80 plus 0.3 times 20) divided by 0.5 gives 44.0. |
| 2 | About 26.0 C. | (0.1 times 90 plus 0.4 times 10) divided by 0.5 gives 26.0. |
| 3 | Between the starting temperatures of the cold and hot water. | Energy flows from hot to cold until both reach the same temperature. |
| 4 | 22 500 J. | 0.5 times 900 times 50 gives 22 500 J. |
| 5 | Water rises about 2.38 C and aluminium about 11.11 C, so water warms less. | A larger specific heat means a smaller rise: 10000 over 4200 against 10000 over 900. |
| 6 | Its specific heat is large, 4200 J/kgC, so it absorbs plenty of energy for a small rise. | A large specific heat means it is hard to warm and hard to cool, so it stores and absorbs heat well. |
| 7 | From the hotter to the colder body until both reach the same temperature. | At equal temperature the flows balance, so the net flow is zero. |
| 8 | The vacuum layer blocks conduction and convection, the silvered wall cuts radiation, and the stopper seals the neck. | Each trick targets one path: conduction and convection, then radiation, then loss through the neck. |
| 9 | The one with the larger area. | Conduction rate grows with area and temperature difference, and falls with thickness. |
| 10 | Heat also depends on mass and specific heat: a small cup at 90 C can hold less heat than a large tank at 40 C. | Heat equals mass times specific heat times temperature change, so temperature alone is not enough. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Paper four clears the unit, conductor and radiation misconceptions in one pass.Tutor Registration →
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