Name Critical Thinking Questions 1. Does the amount of sample used affect the bo

Question

Name Critical Thinking Questions 1. Does the amount of sample used affect the boiling point? Explain. 2. Which of the substances in Table 1 could not be your unknown liquid? Why? 3. If you spill some naphthalene as you transfer it to the test tube from the glazed paper, will your observed freezing point be too high, too low, or unaffected? Explain. 4. Does the freezing point of the solution have the same range as the freezing point of naphthalene? Why? 5. Your thermometer is not calibrated correctly and reads the freezing point of naphthalene as 79°C instead of 81C. How will this affect the calculation of the molecular weight of your unknown? Explain. 6. What is the molecular weight of glucose if 3.62 grams of it lowers the freezing point of 25.0 grams of naphthalene 563°C? 147

Explanation / Answer

Answer 1. The boiling point of a substance depends upon the intermolecular forces between the atoms of the molecules. Depending upon the location (altitude) boiling point may change with atmospheric pressure. But amount of substance does not change boiling point. Any impurity if added to the substance may change boiling point.

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