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S1 Science: States of Matter and the Particle Model (Paper 2 (intermediate))
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Tutor Prep Guide · The three states, particle arrangement and motion, changes of state and latent heat
S1 Science: States of Matter and the Particle Model (Paper 2 (intermediate))
This paper practises comparison and calculation: compressibility of gases, evaporation against boiling, the temperature plateau while boiling, and rate of heating with conservation of mass.
Direct answers For a heating rate first find the rise per minute and then multiply by the time, without skipping either step. When a question mentions melting or boiling, first check whether the temperature stays fixed, because most wrong answers assume it keeps rising.
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: States of Matter and the Particle Model |
| Level | S1 |
02 Questions (10 items)
- FoundationUsing the particle model, why is a gas easy to compress?
- FoundationWhen a beaker of water is heated, how do the particles change?
- IntermediateWhat is the difference between evaporation and boiling?
- ChallengeWhat happens to the temperature of boiling water if heating continues?
- ChallengeWater rises 30 °C every 5 minutes of heating. What is the average rise per minute?
- ChallengeUsing the same rate, how much would the temperature rise in another 7 minutes?
- FoundationHalf of 200 mL of water evaporates. How much is left?
- IntermediateA gas is compressed from 100 cm³ to 50 cm³. What fraction of the original volume remains?
- IntermediateA student says water gets heavier when it turns to ice. Is that correct?
- Error redoA student says the temperature keeps rising while water boils. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | There is a lot of empty space between the gas particles | Pressing the gas pushes the particles closer, so the spaces shrink and the volume drops clearly. |
| 2 | They move faster and the distance between them increases | Temperature measures average particle energy, so heating raises the energy and the particles move further apart. |
| 3 | Evaporation happens only at the surface at any temperature, while boiling happens throughout the liquid at the boiling point | Evaporation is particles escaping from the surface, whereas boiling makes bubbles form inside the liquid. |
| 4 | It stays at 100 °C | The energy supplied is used to turn liquid into gas as latent heat of vaporisation, so the temperature does not rise. |
| 5 | 6 °C | 30 divided by 5 is 6, so the average rise is 6 °C each minute. |
| 6 | 42 °C | At 6 °C per minute, 6 times 7 gives 42 °C. |
| 7 | 100 mL | Half of 200 is 100, so 100 mL remains. |
| 8 | One half | 50 divided by 100 is 0.5, which is one half of the original volume. |
| 9 | No, the mass stays the same | A change of state keeps the same number of particles and only changes their arrangement, so mass is conserved. |
| 10 | The temperature stays at 100 °C while it boils | The energy goes into vaporisation instead of raising the temperature, so it stays constant. |
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.
For particle model questions ask three things: which state the substance is in, how closely the particles are packed, and how their motion changes on heating or cooling.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.