Presentation on theme: "Unit 11 Review Activity MM 12-13. 1. Which of the following can exhibit dipole-dipole attractions between its molecules? CO 2, SO 2, H 2, IF, HBr, CCl."— Presentation transcript:
18. Suppose you have 2 colorless molecular liquids, one boiling at -84 C, the other at 34 C, and both at atmospheric pressure. True or False The higher boiling liquid has greater total IMF than the other.
19. Suppose you have 2 colorless molecular liquids, one boiling at -84 C, the other at 34 C, and both at atmospheric pressure. True or False The lower boiling liquid must consist of nonpolar molecules.
21. As the IMF attraction between molecules increases in magnitude, will heat of vaporization increase or decrease?
IMF increases and heat of vaporization increases
23. A flask of water is connected to a vacuum pump. A few moments after the pump is turned on, the water begins to boil. After a few minutes, the water begins to freeze. Explain why these processes occur.
The pump reduces the pressure in the flask above the water when atmospheric pressure = vapor pressure. Water boils, boiling is endothermic, and the temperature drops if the system is not able to absorb heat from the surroundings fast enough. As the temp of water decreases, the water freezes.