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Chapter 2 Practice Paper: Exploring Diversity of Matter by Physical Properties — mark scheme

QuizQuipPractice Series
QQ/S1SCI/CH2

Secondary 1 · Lower Secondary Science (G2 / G3)

Mark scheme

Exploring Diversity of Matter by Physical Properties

Chapter 2 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]

QuestionAnswer
1ADensity = mass ÷ volume. The volumes are equal, so the largest mass has the greatest density: 24 ÷ 8 = 3 g/cm³.1
2CMagnetism is a physical property. Plastic is not magnetic.1
3BA measuring cylinder is used for a liquid volume. Beaker markings are only a rough guide.1
4DA lower density than the liquid means the object floats.1
5A1 kg = 1000 g, so 2.5 kg = 2500 g.1
6CHardness is resistance to scratching. Flexibility is bending without breaking.1
7DThermal conductivity describes how well heat passes through the material.1
8BThe rise in water level equals the volume of a fully submerged stone.1
9ADensity = mass ÷ volume. The same mass in a smaller volume gives a higher density.1
10CFlexibility is the ability to bend without breaking.1

Section B: Structured questions[20 marks]

QuestionAnswer and marking pointsMarks
1(a)

70 − 20 = 50 cm³

  • 70 − 20 [1]
  • 50 cm³ [1]
2
1(b)

46 ÷ 50 = 0.92 g/cm³

  • 46 ÷ 50 [1]
  • 0.92 g/cm³ [1]

Allow error carried forward from (a).

2
1(c)

It forms a layer on top, because 0.92 g/cm³ is less than 1.0 g/cm³.

  • It floats / forms a layer on top [1]
  • Its density is lower than the density of water [1]

Allow error carried forward from (b).

2
Total for Question 16
2(a)

Q, because it has low thermal conductivity, so the sun’s heat stays out of the hand.

  • Q [1]
  • Low thermal conductivity / heat does not pass through easily [1]
2
2(b)

Heat from the hot bicycle passes into the hand.

  • Heat reaches the hand [1]
1
2(c)

Any one with a reason: strength, so it does not snap; hardness, so it is not easily scratched; flexibility, so it is comfortable to grip.

  • A relevant property [1]
  • A matching reason [1]
2
Total for Question 25
3(a)

Volume of water = 18 ÷ 1.0 = 18 cm³. The charm has the same volume, 18 cm³.

  • 18 ÷ 1.0 = 18 cm³ [1]
  • The charm’s volume is 18 cm³ [1]
2
3(b)

45 ÷ 18 = 2.5 g/cm³

  • 45 ÷ 18 [1]
  • 2.5 g/cm³ [1]

Allow error carried forward from (a).

2
3(c)

Otherwise some of the displaced water stays in the can and the collected volume is too small.

  • So all the displaced water spills out / the volume is not too small [1]
1
Total for Question 35
4(a)

Electrical conductivity [1]

1
4(b)

Hardness [1]

1
4(c)

Melting point is the temperature at which the solid becomes liquid. Strength is how well the material resists breaking when a force is applied.

  • Melting point is the temperature of the solid-to-liquid change [1]
  • Strength is resistance to breaking under a force [1]
2
Total for Question 44

— End of mark scheme —