Question 1
Which of the following is an endothermic process?
a) freezing of water
b) fuel burning in a car engine
c) combustion of cooking gas
d) vaporization of water
Question 2
Which of the following signs on q and w represent a system that is doing work on the surrounds, as well as losing heat to the surroundings?
a) -q, -w
b) +q, +w
c) +q, -w
d) None of the above
e) -q, +w
Question 3
Lead, water, sulfur and arsenic have specific heats of 0.128, 4.18, 0.706 and 0.329 J/goC, respectively. Which of these would require the smallest amount of heat to increase its temperature by 10 oC (assume all samples have the same mass)?
a) Lead
b) Sulfur
c) Arsenic
d) All them will require same amount of energy
e) Water
Question 4
Use the \DeltaÎHof values provided in the textbook to calculate \DeltaÎHorxn for the following:
SO2Cl2(g) + 2 H2O(l) --> 2 HCl(g) + H2SO4(l) \DeltaÎHorxn = ?
SO2Cl2(g) (\DeltaÎHo = -354.8 kJ/mol)
a) -72.2 kJ
b) 256 kJ
c) -1556 kJ
d)512 kJ