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Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat from the surroundings? Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat from the surroundings? q = +, w = + q = +, w = - q = -, w = + q = -, w = - None of these represent the system referenced above

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Reid WolffLv2
17 Dec 2019
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Related questions

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

Calculate ∆E and determine whether the process is endothermic or exothermic for the following cases: (a) q = 0.763 kJ and w = –840 J. (b) A system releases 66.1 kJ of heat to its surroundings while the surroundings do 44.0 kJ of work on the system.

Part A

Calculate ΔE , if q= 0.761 kJ and w= -810 J .

Express your answer using two significant figures.

Part C

Calculate ΔE , if a system releases 66.4 kJ of heat to its surroundings while the surroundings do 43.0 kJ of work on the system. Using 2 sig figs.

Part E

Calculate ΔE , if the system absorbs 7.25 kJ of heat from the surroundings while its volume remains constant (assume that only P−V work can be done). Using 3 sig figs.

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