Effects of impurities Practice Exercise 6

Mary heats two samples of wax. The pure wax melts sharply at 65°C, while the impure wax melts gradually starting at 58°C. What can she conclude? (1 mark)

Mary heats two samples of wax. The pure wax melts sharply at 65°C, while the impure wax melts gradually starting at 58°C. What can she conclude? (1 mark)

Mary heats two samples of wax. The pure wax melts sharply at 65°C, while the impure wax melts gradually starting at 58°C. What can she conclude? (1 mark)

Mary heats two samples of wax. The pure wax melts sharply at 65°C, while the impure wax melts gradually starting at 58°C. What can she conclude? (1 mark)

A learner heats muddy water and clean water. The clean water boils at 100°C, but the muddy water boils later. What is the best explanation for this? (1 mark)

A learner heats muddy water and clean water. The clean water boils at 100°C, but the muddy water boils later. What is the best explanation for this? (1 mark)

A learner heats muddy water and clean water. The clean water boils at 100°C, but the muddy water boils later. What is the best explanation for this? (1 mark)

A learner heats muddy water and clean water. The clean water boils at 100°C, but the muddy water boils later. What is the best explanation for this? (1 mark)

The graph below shows boiling behavior of two liquids. Liquid X is pure water. Liquid Y is salty water.Why does Liquid Y boil at a higher temperature?  (1 mark)

The graph below shows boiling behavior of two liquids. Liquid X is pure water. Liquid Y is salty water.Why does Liquid Y boil at a higher temperature?  (1 mark)

The graph below shows boiling behavior of two liquids. Liquid X is pure water. Liquid Y is salty water.Why does Liquid Y boil at a higher temperature?  (1 mark)

The graph below shows boiling behavior of two liquids. Liquid X is pure water. Liquid Y is salty water.Why does Liquid Y boil at a higher temperature?  (1 mark)

Which of the following best explains how heating curves can help identify if a substance is pure or impure? (1 mark)

Which of the following best explains how heating curves can help identify if a substance is pure or impure? (1 mark)

Which of the following best explains how heating curves can help identify if a substance is pure or impure? (1 mark)

The diagram below shows the heating curves of two substances. Substance A is pure. Substance B contains impurities.What is the most likely reason for the differences in the melting and boiling points?  (1 mark)

The diagram below shows the heating curves of two substances. Substance A is pure. Substance B contains impurities.What is the most likely reason for the differences in the melting and boiling points?  (1 mark)

The diagram below shows the heating curves of two substances. Substance A is pure. Substance B contains impurities.What is the most likely reason for the differences in the melting and boiling points?  (1 mark)

The diagram below shows the heating curves of two substances. Substance A is pure. Substance B contains impurities.What is the most likely reason for the differences in the melting and boiling points?  (1 mark)

A chemistry student compares pure wax and wax mixed with sand. The impure wax melts at a lower temperature and more slowly. What causes this change?  (1 mark)

A chemistry student compares pure wax and wax mixed with sand. The impure wax melts at a lower temperature and more slowly. What causes this change?  (1 mark)

A chemistry student compares pure wax and wax mixed with sand. The impure wax melts at a lower temperature and more slowly. What causes this change?  (1 mark)

A chemistry student compares pure wax and wax mixed with sand. The impure wax melts at a lower temperature and more slowly. What causes this change?  (1 mark)

The diagram below shows boiling points of three water samples: Sample A: Distilled water (100°C), Sample B: Tap water (102°C), Sample C: Salty water (105°C).Which statement best explains the trend in boiling points shown in the diagram?  (1 mark)

The diagram below shows boiling points of three water samples: Sample A: Distilled water (100°C), Sample B: Tap water (102°C), Sample C: Salty water (105°C).Which statement best explains the trend in boiling points shown in the diagram?  (1 mark)

The diagram below shows boiling points of three water samples: Sample A: Distilled water (100°C), Sample B: Tap water (102°C), Sample C: Salty water (105°C). Which statement best explains the trend in boiling points shown in the diagram?  (1 mark)

The diagram below shows boiling points of three water samples: Sample A: Distilled water (100°C), Sample B: Tap water (102°C), Sample C: Salty water (105°C). Which statement best explains the trend in boiling points shown in the diagram?  (1 mark)

The diagram below shows heating curves for two samples of the same substance. Sample A is pure, and Sample B contains impurities.What conclusion can be made about the effect of impurities on the heating behavior of Sample B? (1 mark)

The diagram below shows heating curves for two samples of the same substance. Sample A is pure, and Sample B contains impurities.What conclusion can be made about the effect of impurities on the heating behavior of Sample B? (1 mark)

The diagram below shows heating curves for two samples of the same substance. Sample A is pure, and Sample B contains impurities. What conclusion can be made about the effect of impurities on the heating behavior of Sample B? (1 mark)

The diagram below shows heating curves for two samples of the same substance. Sample A is pure, and Sample B contains impurities. What conclusion can be made about the effect of impurities on the heating behavior of Sample B? (1 mark)

Linnet is melting stearic acid. Her impure sample melts from 52°C to 57°C, while her teacher’s pure sample melts sharply at 55°C. What can she conclude? (1 mark)

Linnet is melting stearic acid. Her impure sample melts from 52°C to 57°C, while her teacher’s pure sample melts sharply at 55°C. What can she conclude? (1 mark)

Linnet is melting stearic acid. Her impure sample melts from 52°C to 57°C, while her teacher’s pure sample melts sharply at 55°C. What can she conclude? (1 mark)

Two students test ethanol samples. One uses pure ethanol, the other uses ethanol mixed with water. The boiling points are different. Why?  (1 mark)

Two students test ethanol samples. One uses pure ethanol, the other uses ethanol mixed with water. The boiling points are different. Why?  (1 mark)

Two students test ethanol samples. One uses pure ethanol, the other uses ethanol mixed with water. The boiling points are different. Why?  (1 mark)

Two students test ethanol samples. One uses pure ethanol, the other uses ethanol mixed with water. The boiling points are different. Why?  (1 mark)