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S1 Science: Laboratory Safety and Apparatus (Paper 3 (challenge))
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S1 Science: Laboratory Safety and Apparatus (Paper 3 (challenge))
This paper challenges judgement on fume cupboards, condensers, extinguishers and filtration, with density, volume and estimated-reading calculations.
Direct answers Ask whether the aim is separating, heating or measuring, and the right apparatus follows.
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)
- FoundationWhen should goggles be worn in the laboratory?
- FoundationWhat kind of substances are handled in a fume cupboard?
- FoundationIn a distillation set-up, how should the water flow through the condenser?
- IntermediateA liquid of mass 12.5 g fills 5.0 cm3. What is its density?
- Intermediate0.25 L of solution is split equally into 5 portions. How many millilitres each?
- IntermediateA balance reads 0.0 g, then three filter papers of 0.1 g each are added. What should it read?
- ChallengeWhich extinguisher is used on an electrical fire, and why?
- ChallengeHow many 10 mL portions can be taken from 500 mL of water?
- ChallengeA cylinder has 10 mL divisions; readings are estimated to one tenth of a division. To what value?
- Error redoA student says an evaporating dish separates an insoluble solid from water. What is right?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Throughout the whole practical lesson | Splashes and broken glass can happen at any moment, so do not wait until heating starts. |
| 2 | Those giving off toxic or choking gases | A fume cupboard extracts the gas, protecting the user and everyone else. |
| 3 | In at the bottom, out at the top | Bottom in and top out keeps the condenser full of water for the best cooling. |
| 4 | 2.5 g/cm3 | Density is mass over volume, 12.5 divided by 5.0, giving 2.5 g/cm3. |
| 5 | 50 mL | 0.25 L is 250 mL, and 250 divided by 5 is 50 mL. |
| 6 | 0.3 g | Three times 0.1 g is 0.3 g; tare the papers before weighing a sample. |
| 7 | A carbon dioxide extinguisher, because it does not conduct and leaves no residue | Water conducts and ruins equipment, so CO2 or dry powder is used. |
| 8 | 50 portions | Five hundred divided by ten is fifty. |
| 9 | About 1 mL | One tenth of 10 mL is 1 mL, and that extra digit reduces reading error. |
| 10 | A funnel with filter paper, that is filtration | The confusion is between evaporating a solution to dryness and filtering off an insoluble solid. |
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 →
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.