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12 Dec 2019

The change in internal energy, ÎE, of a system is represented by the relation between heat (q) and work (w) as:

A) E = w - q

B) E = q + w

C) E = w/q

D) E = q/w

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Elin HesselLv2

13 Dec 2019

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Given that system A went a longer path than system B. Which of the following statements must be true? a) W change b) Q change c) ÎE change d) They are constant e) They all change f) Q stayed constant

A gas is allowed to expand at constant temperature from a volume of 1.0 L to 10.1 L against an external pressure of 0.50 atm. If the gas absorbs 250 J of heat from the surroundings, what are the values of Q, W, and ΔU? (Please Explain.)

A. Q = 250 J; W = -460 J; ΔU = -210 J

B. Q = -250 J; W = -460 J; ΔU = -710 J

C. Q = 250 J; W = 460 J; ΔU = 710 J

D. Q = -250 J; W = 460 J; ΔU = 245 J

E. Q = 250 J; W = -4.55 J; ΔU = 245 J

chocolaterhinoceros139

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

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The change in internal energy, ÎE, of a system is represented by the relation between heat (q) and work (w) as:

A) E = w - q

B) E = q + w

C) E = w/q

D) E = q/w

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The change in internal energy, ÎE, of a system is represented by the relation between heat (q) and work (w) as: A) E = w - q B) E = q + w C) E = w/q D) E = q/w

Unlock all answers

Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related questions

Weekly leaderboard

The change in internal energy, ÎE, of a system is represented by the relation between heat (q) and work (w) as:

A) E = w - q

B) E = q + w

C) E = w/q

D) E = q/w