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P4 General Studies: States of Matter and Dissolving (Paper 2 (intermediate))
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 2 (intermediate))
Paper two adds mass sums, a warming rate and separation methods, training one-step decisions.
Direct answers For a separation question, ask first whether the solute has dissolved, then choose filtering or evaporation.
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)
- FoundationFifty grams of salt dissolve fully in 200 g of water. What is the mass of the solution?
- FoundationWhat does stirring do to sugar dissolving in water?
- FoundationIce turns to water on heating. What is this change called?
- IntermediateA 300 g sugar solution contains 45 g of sugar. What proportion is that, in percentage points?
- IntermediateEvaporating 500 mL of salt water leaves 25 g of salt. How much water evaporated?
- IntermediateIce warms from minus 10 to 0 degrees Celsius in ten minutes. What is the average rise per minute?
- ChallengeEighteen of 24 materials dissolve in water. What proportion is that, in percentage points?
- ChallengeSand is mixed into water. Which method separates the sand?
- ChallengeHow is salt recovered from salt water?
- Error redoError clinic: after sugar dissolves, the solution is lighter than the water alone. Is that right?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 250 g. | Fifty plus 200 gives 250 g; dissolving does not destroy mass. |
| 2 | It dissolves faster. | Stirring brings sugar and water together faster, but does not raise how much can dissolve. |
| 3 | Melting. | A solid turning liquid with heat is melting; the reverse is freezing. |
| 4 | 15.0 percentage points. | Forty-five divided by 300, multiplied by 100, gives 15.0 percentage points. |
| 5 | 475 mL. | Water is about 1 g per mL, so 500 minus 25 gives 475 mL. |
| 6 | 1.0 degrees Celsius. | From minus 10 to 0 is a rise of 10 degrees; 10 divided by 10 gives 1.0 degrees a minute. |
| 7 | 75.0 percentage points. | Eighteen divided by 24, multiplied by 100, gives 75.0 percentage points. |
| 8 | Filtration. | Sand does not dissolve, so filter paper traps it and clear water passes through. |
| 9 | By evaporation, leaving salt crystals behind. | The salt is dissolved, so a filter cannot catch it; only driving the water off recovers it. |
| 10 | No. | Adding a solute only adds mass; the solution weighs the water plus the sugar. |
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.
Then try paper three, using voltage and current to work out power and resistance.Tutor Registration →
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