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Characteristic Properties   1)

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Characteristic Properties

 

1). What was the melting point of water?

 

 

2. What was the boiling point of water?

 

 

3. What happened to the temperature of the water once it started to freeze?

 

 

4. What happened to the temperature of the water after it reached the boiling point?

 

 

5. The temperature at the boiling point remained constant despite the continued addition of heat by the Bunsen burner. What was the energy used for?

 

 

6. What was the melting point of liquid #1? Choose the closest answer.

 

 

7. What was the boiling point of liquid #4? Choose the closest answer.

 

 

8. Which unknown had the highest melting point?

 

 

9. Which unknown had the highest boiling point?

 

 

10. Which unknown had the lowest melting point?

 

 

11. Which unknown had the lowest boiling point?

 

 

12. Given what you know about the melting point of a mixture, why do you think salt is sprinkled on icy sidewalks in the winter?

 

 

13. Given the literature values for the substances in the table below, which substances will be the hardest to identify based on boiling point alone?

 

 

14. Suppose a student measured a boiling point of 61.0 °C and a melting point of -63.2 °C for an unknown liquid. Given the data in the table below, what solvent did the student have as an unknown?

 

 

15. The purity of a substance will often affect the melting and boiling points. This is used by chemists to assess the purity of a product. How does the purity of the substance affect the melting and boiling points?

 

 

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