Page 396 - Teacher Preview Copy

Constructed Response . Topic 7: Solutions

Set C: Nature of solute, intermolecular forces, sublimation

Base your answers to questions 7 and 8 on the information below.

Naphthalene, a nonpolar substance that sublimes at room temperature,

can be used to protect wool clothing from being eaten by moths.

7. Explain why naphthalene is NOT expected to dissolve 7.
in water.

8. Explain, in te rms of intermolecular forces, why 8.
naphthalene sublimes.

Teacher Preview Copy
Teacher Preview Copy

Set D: Saturation, grams of precipitate, solute, Reading Reference Table G

Base your answers to questions 9 through 11 on the information below.

o
A student uses 200 grams of water at 60 C to prepare a saturated

solution of potassium chloride, KCl.

Write your answers here.

9. According to reference Table G, how many 9.

grams of KCl must be used to create this

saturated solution.

o
10. This solution is cooled to 10 C and the excess 10.

precipitate (settle) out. The resulting solution is

o
saturated at 10 C. How many grams of KCl

precipitated out of the original solution?

11. Identify the solute in this solution? 11.

Set E. Reference Table F, soluble and insoluble compounds

According to Reference Table F, indicate in the space if the compound is “soluble” or “insoluble.”

12. Ammonium chloride 12. ____________

13. Calcium phosphate 13. _____________

14. Sodium sulfide 14. ______________

15. Silver bromide 15. ______________

16. Barium sulfate 16. ______________

386 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com