中文（繁體）
中文（简体）
English
P4 General Studies: States of Matter and Dissolving (Paper 4 (error clinic))
Tutor Prep Guide · the three states of matter, dissolving with solutes and solvents, factors that change dissolving speed, saturated solutions and separation by filtering or evaporation
P4 General Studies: States of Matter and Dissolving (Paper 4 (error clinic))
Paper four revisits the mistakes from the first three papers, fixing ideas and numbers together.
Direct answers Decide first whether the question is about states, dissolving, mass or separation, then answer.
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: P4 General Studies: States of Matter and Dissolving |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationHow do dissolving and melting differ?
- FoundationCan filter paper separate salt that has dissolved in water?
- FoundationIs sugar water pure water?
- IntermediateSix of eight liquids are solutions. What proportion is that, in percentage points?
- IntermediateFifty grams of sugar dissolve fully in 200 mL of water. What is the mass of the solution?
- IntermediateWhat happens to the speed of dissolving when the water is warmer?
- ChallengeEvaporation from a cup rises from 100 mL to 300 mL. What is the increase in percentage points?
- ChallengeWhy do droplets appear on the outside of a cold drink?
- ChallengeWhich two things do solids, liquids and gases share?
- Error redoError clinic: ice melting into water is dissolving. Is that right?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Dissolving spreads a solute through a solvent; melting turns a solid into a liquid with heat. | Sugar in water dissolves, while ice turning to water melts; the two must not be confused. |
| 2 | No. | The dissolved salt passes through with the water, so evaporation is needed to recover it. |
| 3 | No. | Sugar water is a solution of water as solvent and sugar as solute, not pure water. |
| 4 | 75.0 percentage points. | Six divided by eight, multiplied by 100, gives 75.0 percentage points. |
| 5 | 250 g. | Two hundred plus 50 gives 250 g; mass is conserved through dissolving. |
| 6 | It increases. | Warmer water has faster-moving molecules, so the sugar dissolves sooner. |
| 7 | 200.0 percentage points. | The rise is 200 mL; 200 divided by 100 then multiplied by 100 gives 200.0 percentage points. |
| 8 | Water vapour in the air condenses on the cold glass. | The outside is cold, so vapour condenses there; the drink has not leaked through. |
| 9 | All have mass and all occupy space. | All three are made of particles; only their arrangement and spacing differ. |
| 10 | No. | Melting only changes the state, while dissolving spreads a solute through a solvent; they are different changes. |
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.
With all four done, go back to the chapter page and revise the three parts of a closed circuit plus three safety habits.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.