Author Question: According to the first law of thermodynamics, the energy of the universe is constant. Does this mean ... (Read 22 times)

colton · **on:** Mar 21, 2021

Question 1

A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is

◦ 61.6 J.
◦ 30.8 J.
◦ –61.6 J.
◦ –30.8 J.
◦ none of these are correct.

Question 2

According to the first law of thermodynamics, the energy of the universe is constant. Does this mean that ΔE is always equal to zero?

◦ Yes, ΔE = 0 at all times, which is why q = -w.
◦ No, ΔE does not always equal zero, but this is only due to factors like friction and heat.
◦ No, ΔE does not always equal zero because it refers to the system's internal energy, which is affected by heat and work.
◦ No, ΔE never equals zero because work is always being done on the system or by the system.
◦ No, ΔE never equals zero because energy is always flowing between the system and surroundings.

Tonny · **Reply #1 on:** Mar 21, 2021

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