WA2 Practice Paper: Weighted Assessment 2 — mark scheme (print)

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QQ/S1SCI/WA2

Secondary 1 · Lower Secondary Science (G2 / G3)

Mark scheme

Weighted Assessment 2

WA2 Practice Paper · Maximum mark: 30

Notes for markers

Award one mark for each point marked [1], up to the marks shown for the part.
Accept answers worded differently that show the same understanding.
Units are required where the answer line shows one. ecf: allow an error carried forward.

Section A: Multiple-choice questions[10 marks]

Question	Answer
1	APure water is one substance made of hydrogen and oxygen joined chemically.	1
2	CDifferent dyes travel different distances up the paper, so the inks can be compared.	1
3	BThe ray changes direction as it enters a different material. That bending is refraction.	1
4	DCopper, oxygen and iron are each made of one kind of atom.	1
5	ASand grains are too large to pass through filter paper, so they stay on the paper.	1
6	CAngles of incidence and reflection are measured from the normal, the line at 90° to the surface.	1
7	BThe substance that dissolves is the solute. Water is the solvent.	1
8	DOn a plane mirror the angle of reflection equals the angle of incidence.	1
9	AThe solvent boils, the vapour is cooled, and the liquid is collected as the distillate.	1
10	CThe metals are mixed but not chemically joined, so brass is a mixture.	1

Section B: Structured questions[20 marks]

Question	Answer and marking points	Marks
1(a)	Compound [1]	1
1(b)	It is one substance made of more than one element (sodium and chlorine) chemically joined. Chemically joined / two elements in one substance [1]	1
1(c)	A compound has a fixed composition and its elements are chemically joined. A mixture can vary in composition and its parts are not chemically joined, so they can be separated by physical methods. Fixed composition / chemically joined [1] Mixture composition can vary / parts not chemically joined [1]	2
1(d)	Water [1]	1
	Total for Question 1	5
2(a)	Move a magnet through the mixture. The iron filings stick to the magnet. Use a magnet to attract the iron [1]	1
2(b)	Sand is the residue on the filter paper. Salt solution passes through as the filtrate. Sand / residue on the paper [1] Salt solution as the filtrate [1]	2
2(c)	Heat the filtrate so that some water evaporates, then leave it to cool and crystallise. Dry the crystals. Evaporate some water / heat the solution [1] Cool to crystallise, or leave to evaporate slowly [1]	2
	Total for Question 2	5
3(a)	90° [1]	1
3(b)	40°. The angle of reflection equals the angle of incidence. 40° [1] Angle of reflection equals angle of incidence [1]	2
3(c)	He measured from the mirror, so he recorded 90° − 40° = 50°. The angle of incidence must be measured from the normal. He measured from the mirror, not the normal [1] The correct angle is 40°, or 50° is the complement of 40° [1]	2
	Total for Question 3	5
4(a)	Smaller [1]	1
4(b)	It bends away from the normal, because it is going from glass into air (a less optically dense material). Bends away from the normal [1] Light is leaving glass / entering air [1]	2
4(c)	Light travels in straight lines, and it can be reflected and refracted at a surface. Travels in straight lines [1] Can be reflected or refracted [1]	2
	Total for Question 4	5

— End of mark scheme —