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S1 Science: Laboratory Safety and Apparatus (Paper 2 (intermediate))
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S1 Science: Laboratory Safety and Apparatus (Paper 2 (intermediate))
This paper covers the rules for heating and diluting, plus capacity limits and percentage error by multiplication and division.
Direct answers In a lab, ask about safety before speed; a wrong order is more dangerous than being slow.
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: Laboratory Safety and Apparatus |
| Level | S1 |
02 Questions (10 items)
- FoundationHow should a spirit lamp be put out?
- FoundationWhere should the mouth of a heated test tube point?
- FoundationWhen diluting concentrated sulphuric acid, which liquid is poured into which?
- IntermediateA 30 mL test tube is heated; liquid may fill at most one third. What is the maximum volume?
- IntermediateDilute acid splashes onto the skin. What is the first step?
- IntermediateA cylinder with 2 mL divisions is used for 60 mL with about 1 mL error. What is the percentage error?
- ChallengeWater is warmed from 20 °C to 85 °C. What is the rise?
- ChallengeThree identical samples of 4.5 g are weighed together. What is the total mass?
- ChallengeWhy hold a heated test tube with a test tube holder rather than by hand?
- Error redoA student pours water into concentrated acid saying it is faster. What is correct?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Cover it with the cap | Blowing may drive the flame inside and start a fire, so use the cap. |
| 2 | Upwards at about 45 degrees, away from everyone | About 45 degrees upwards lets gas escape, and it must point away from people. |
| 3 | Pour the acid slowly into the water | Acid into water lets the water absorb the heat; the reverse boils and spits acid. |
| 4 | 10 mL | One third of 30 mL is 10 mL, leaving room for boiling. |
| 5 | Wash at once with plenty of water, then tell the teacher | Flush with plenty of water first; never neutralise on the skin because the heat burns. |
| 6 | About 1.7% | One divided by sixty, times one hundred, is about 1.7%. |
| 7 | 65 °C | Eighty five minus twenty is 65 °C. |
| 8 | 13.5 g | Four point five times three is 13.5 g. |
| 9 | It keeps the heat off your hand and holds the tube steady | Glass conducts heat, so the holder keeps your hand away from it. |
| 10 | The acid should be poured slowly into the water | The order is wrong: water into acid boils locally and spits, so acid goes into water. |
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.
Three lab habits: read the scale before pouring, never point a heated tube at anyone, and always add acid to water; read a measuring cylinder at eye level on the bottom of the meniscus.Tutor Registration →
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