Question

1. Select the steps that are associated with energy entering thesystem. Check all that apply.
a. the separation of solvent molecules
b. the separation of solute molecules
c. the mixing of solute and solvent molecules

2. A student working on a laboratory experiment dissolves ahypothetical solute AB in water. The student observes that theflask becomes cold to the touch.
Use the diagram to determine which of the following equationsaccurately shows the relationship between the magnitude of theenthalpy values for each step in the dissolution of AB in water fora flask that becomes cold to the touch.
DAGRAM:http://media.pearsoncmg.com/ph/esm/esm_tro_principles_1/emedia/AAEDKKQ0.swf
a. (?H1 + ?H2) > ?H3
b. (?H1 + ?H2) = ?H3
c. (?H1 + ?H2) < ?H3

3. Select the ?H values associated with the dissolution of lithiumchloride that are exothermic. Check all that apply.

a. Energy will be transferred into the system.
b. The ?H3 value will increase.
c. The ?H soln value will decrease.
d. The reaction will become endothermic.