HW #15 for 4/19

HW #15 for 4/19:
1. A student performed an experiment in which a yellow solution is poured into a beaker
containing a colorless solution. A bright yellow precipitate formed, and the temperature of the
reaction container increased.
Which of the following statements is true?
A. The reaction is endothermic.
B. The formation of the precipitate is a physical change, not a chemical change.
C. The reaction is exothermic.
D. none of the above

2. The amount of heat gained or lost by a substance depends on all of the following
EXCEPT:
A. the change in temperature of the substance.
B. the change in volume of the substance.
C. the mass of the substance.
D. the specific heat capacity of the substance.

3, Which change of phase is endothermic?
A. CO₂(g) ® CO₂(s)
B. H₂O(l) ® H₂O(s)
C. I₂(s) ® I₂(g)
D. H₂O(g) ®  H₂O(l)

4. You place 100.0 g of a hot metal in 100.0 g of cold water. Which substance (metal or water)
undergoes a larger temperature change? Why is this?

5. What is the difference between “quality” and “quantity” of energy? Are both conserved? Is either
conserved?