S1 Science: Laboratory Safety And Apparatus (Paper 4 (error Clinic))

S1 Science: Laboratory Safety and Apparatus (Paper 4 (error clinic))

2026-11-14

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Tutor Prep Guide · Probability scale, favourable over total outcomes, comparing and expected counts

S1 Science: Laboratory Safety and Apparatus (Paper 4 (error clinic))

This paper re-drills the commonest errors: reading direction, dilution order and heating angle, plus mass and percentage error.

Direct answers　Most errors are about direction and order rather than arithmetic; remember level eye, acid into water, 45 degrees.

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 your head be placed when reading a cylinder?
FoundationWhat is the correct way to put out a spirit lamp?
FoundationWhat is the correct order when diluting concentrated acid?
IntermediateA balance shows 19.8 g. What is the unit measuring?
IntermediateA 250 mL cylinder is used three times for 80 mL each. What total volume is measured?
IntermediateWater goes from 25 °C to 40 °C. What is the rise?
ChallengeAt about what angle should a heated test tube point upwards?
ChallengeSamples of 12.5 g and 7.3 g are weighed together. What is the total?
ChallengeA 200 mL measurement carries a 5 mL error. What is the percentage error?
Error redoA student says looking down at a cylinder makes the reading too small. What is correct?

03　Answers and one-line notes

#	Answer	One-line note
1	Level with the liquid surface	Sight level with the bottom of the meniscus gives the true volume.
2	Cover it with the cap	Never blow it out, because the flame may be driven inside.
3	Pour the acid slowly into the water	Acid into water; water into acid boils and spits.
4	Grams (g), the mass	A balance gives mass in grams, not weight in newtons.
5	240 mL	Three times 80 mL is 240 mL, still within the 250 mL capacity.
6	15 °C	Forty minus twenty five is 15 °C.
7	About 45 degrees	About 45 degrees lets gas escape while pointing away from people.
8	19.8 g	Twelve point five plus seven point three is 19.8 g.
9	2.5%	Five over two hundred times one hundred is 2.5%.
10	Looking down makes it too high; looking up makes it too small	The direction is wrong: looking down raises the reading.

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.