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Science questions, unit 8
Nama / NameKelas / ClassTarikh / Date

Mixture

28 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.

Section A: objective questions

12 marks
Choose the best answer for each question.
1

Question 1

What is a mixture?
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A
A mixture has two or more materials mixed together.
For the teacher: Remembering, low difficulty, standard 8.1.1
Textbook p. 88
2

Question 2

Kugan and Kanang pick nuts out of muruku by hand. Why can they use the hand-picking method?
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B
Hand-picking works for big materials that look different.
For the teacher: Understanding, low difficulty, standard 8.1.2
Textbook p. 89
3

Question 3

Which method separates raisins from flour?
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C
Fine flour goes through a sieve and the big raisins stay on it.
For the teacher: Applying, low difficulty, standard 8.1.2
Textbook p. 90
4

Question 4

Paper clips are mixed with sand. Which one separates them?
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D
The magnet attracts the iron paper clips.
For the teacher: Applying, low difficulty, standard 8.1.2
Textbook p. 91
5

Question 5

Wood bits and sand are in an aquarium. Which method separates them?
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B
The wood bits float in water and the sand sinks.
For the teacher: Understanding, medium difficulty, standard 8.1.2
Textbook p. 92
6

Question 6

Hibiscus petals are pounded and mixed with water. What do we use to get the coloured liquid?
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C
Filtration separates a solid from a liquid.
For the teacher: Understanding, medium difficulty, standard 8.1.2
Textbook p. 93
7

Question 7

Which material dissolves in water?
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D
Sugar dissolves. The others can still be seen after stirring.
For the teacher: Remembering, low difficulty, standard 8.1.3
Textbook p. 94
8

Question 8

Rice is stirred in water. Which is true?
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A
Rice does not dissolve in water.
For the teacher: Understanding, low difficulty, standard 8.1.3
Textbook p. 95
9

Question 9

Sugar is added to cold water in A and hot water in B. In which beaker does it dissolve more quickly?
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D
Materials dissolve more quickly in hot water.
For the teacher: Applying, low difficulty, standard 8.1.4
Textbook p. 96
10

Question 10

Sugar is put in two beakers of water. Only one beaker is stirred. What happens?
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C
Stirring helps materials dissolve more quickly.
For the teacher: Understanding, medium difficulty, standard 8.1.4
Textbook p. 98
11

Question 11

Coarse sugar and a sugar cube are put in water. Which dissolves more quickly?
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A
Small pieces dissolve more quickly than big pieces.
For the teacher: Applying, medium difficulty, standard 8.1.5
Textbook p. 99
12

Question 12

Ali wants his tea to be sweet very quickly. What should he do?
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B
Stirring (and hot water, small pieces) helps sugar dissolve more quickly.
For the teacher: Applying, high difficulty, standard 8.1.4
Textbook p. 99

Section B: structured questions

16 marks
Answer all the questions.
13

Question 13

Write the best method to separate each mixture. Choose from: hand-picking, sieving, magnet, floatation, filtration.
[1 mark] (a)Paper clips and staples are mixed together.
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Tick each point you got.
[1 mark] (b)Iron powder and beach sand.
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Tick each point you got.
[1 mark] (c)Corks and sand in water.
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Tick each point you got.
[1 mark] (d)Green beans and flour.
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 8.1.2
Textbook p. 100
14

Question 14

Diagram 1 shows how Nisa gets coloured liquid from pounded hibiscus petals mixed with water.
A girl pours pink liquid from a beaker through a filter paper in a funnel into a flask
Diagram 1
[1 mark] (a)Name the method used to separate the petals from the liquid.
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Tick each point you got.
[1 mark] (b)What stays on the filter paper?
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Tick each point you got.
[1 mark] (c)Where does the coloured liquid go?
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 8.1.2
Textbook p. 93
15

Question 15

Sam stirs salt, green beans and rice in three beakers of water.
[1 mark] (a)Salt dissolves in water.
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True
[1 mark] (b)Green beans dissolve in water.
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False
[1 mark] (c)Name the material that dissolves.
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 8.1.3
Textbook p. 95
16

Question 16

Sugar is added to cold water in beaker A and hot water in beaker B. The same amount of sugar is used and both beakers are stirred.
[1 mark] (a)In which beaker does the sugar dissolve more quickly?
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Tick each point you got.
[1 mark] (b)Give one more way to make sugar dissolve more quickly.
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Use small pieces of sugar.
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 8.1.4
Textbook p. 96
17

Question 17

A sugar cube and coarse sugar are put in two beakers with the same amount of water.
[1 mark] (a)Which dissolves more quickly?
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Tick each point you got.
[1 mark] (b)Why?
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Because it is small in size.
Tick each point you got.
[2 marks] (c)Name two ways to make a sugar cube dissolve more quickly.
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Stir it and use hot water.
Any 2 points
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 8.1.5
Textbook p. 99