Effects of impurities Practice Exercise 3

Course: Grade 8 Integrated Science - Physical and chemical changes - Effects of impurities

Quiz Questions (40 questions)

Question 1

Define the terms boiling point and melting point. (1 mark)

Question 2

Define the terms boiling point and melting point. (1 mark)

Question 3

Define the terms boiling point and melting point.  (1 mark)

Question 4

Define the terms boiling point and melting point.  (1 mark)

Question 5

The diagram below shows a beaker labeled “salt water.” What is meant by an impurity in a substance? (1 mark)

Question 6

The diagram below shows a beaker labeled “salt water.” What is meant by an impurity in a substance? (1 mark)

Question 7

The diagram below shows a beaker labeled “salt water.” What is meant by an impurity in a substance? (1 mark)

Question 8

The diagram below shows a beaker labeled “salt water.” What is meant by an impurity in a substance? (1 mark)

Question 9

The diagram below shows a beaker labeled “salt water.” What is meant by an impurity in a substance? (1 mark)

Question 10

Define a pure substance. (1 mark)

Question 11

Define a pure substance. (1 mark)

Question 12

The diagram below shows a heating curve of a substance. What is a heating curve? (1 mark)

Question 13

The diagram below shows a heating curve of a substance. What is a heating curve? (1 mark)

Question 14

The diagram below shows a heating curve of a substance. What is a heating curve? (1 mark)

Question 15

The diagram below shows a heating curve of a substance. What is a heating curve? (1 mark)

Question 16

The diagram below shows a heating curve of a substance. What is a heating curve? (1 mark)

Question 17

What is an impure substance? (1 mark)

Question 18

What is an impure substance? (1 mark)

Question 19

Why is distilled water used in experiments to measure the boiling point of water? (2 marks)

Question 20

Why is distilled water used in experiments to measure the boiling point of water? (2 marks)

Question 21

The diagram below shows two beakers being heated. Beaker A contains pure water, and Beaker B contains water mixed with salt.Explain why the boiling point of the water in Beaker B is higher than in Beaker A. (2 marks)

Question 22

The diagram below shows two beakers being heated. Beaker A contains pure water, and Beaker B contains water mixed with salt.Explain why the boiling point of the water in Beaker B is higher than in Beaker A. (2 marks)

Question 23

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 24

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 25

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 26

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 27

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 28

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 29

How does the presence of salt affect the melting point of ice? Give a scientific explanation. (2 marks)

Question 30

The diagram below shows two samples of a solid being heated. Sample A is pure and melts at 80°C. Sample B contains impurities and begins to melt at 72°C.What conclusion can you draw about the effect of impurities on the melting point? Explain.  (2 marks)

Question 31

The diagram below shows two samples of a solid being heated. Sample A is pure and melts at 80°C. Sample B contains impurities and begins to melt at 72°C.What conclusion can you draw about the effect of impurities on the melting point? Explain.  (2 marks)

Question 32

The diagram below shows two samples of a solid being heated. Sample A is pure and melts at 80°C. Sample B contains impurities and begins to melt at 72°C.What conclusion can you draw about the effect of impurities on the melting point? Explain.  (2 marks)

Question 33

The diagram below shows two samples of a solid being heated. Sample A is pure and melts at 80°C. Sample B contains impurities and begins to melt at 72°C.What conclusion can you draw about the effect of impurities on the melting point? Explain.  (2 marks)

Question 34

The diagram below shows two samples of a solid being heated. Sample A is pure and melts at 80°C. Sample B contains impurities and begins to melt at 72°C. What conclusion can you draw about the effect of impurities on the melting point? Explain. (2 marks)

Question 35

The diagram below shows two samples of a solid being heated. Sample A is pure and melts at 80°C. Sample B contains impurities and begins to melt at 72°C. What conclusion can you draw about the effect of impurities on the melting point? Explain. (2 marks)

Question 36

State how impurities affect the melting point of a pure solid. Give a reason for your answer. (2 marks)

Question 37

State how impurities affect the melting point of a pure solid. Give a reason for your answer. (2 marks)

Question 38

State how impurities affect the melting point of a pure solid. Give a reason for your answer. (2 marks)

Question 39

State how impurities affect the melting point of a pure solid. Give a reason for your answer. (2 marks)

Question 40

State how impurities affect the melting point of a pure solid. Give a reason for your answer. (2 marks)

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