Question 1 Which of the following is an endothermic process? a) freezing of wate

Question

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 DeltaHof values provided in the textbook to calculate DeltaHorxn for the following:
SO2Cl2(g) + 2 H2O(l) --> 2 HCl(g) + H2SO4(l) DeltaHorxn = ?
SO2Cl2(g) (DeltaHo = -354.8 kJ/mol)
a) -72.2 kJ
b) 256 kJ
c) -1556 kJ
d)512 kJ

Explanation / Answer

question 1:

d) vapourisation of water

question 2:

a) -q, - w

queation 3)

a) lead (compound with lowest heat capacity requires lowest amount of heat)

question 4:

delta H reaction= delta H formation of product- delta H reactant

delta H reaction = (-285.8-354.8) -( -92.3 - 814) = 465.7 kJ/mol

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