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13 May, 11:00

Suppose a system receives a "deposit" of work from the surroundings and loses a "withdrawal" of heat to the surroundings. Can we determine the sign of ΔE for this process?

A. No, because we are not given specific values for w and q.

B. No, because it an open system.

C. Yes, because we know the signs of w and q.

D. No, because we do not know the temperature of the system

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  1. 13 May, 13:03
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    A. No, because we are not given specific values for w and q.

    Explanation:

    The change of internal energy of a system is:

    ΔE = q + w

    where q represents heat and w represents work.

    It is necessary to know the magnitude and the sign of q and w in order to know if the system's internal energy is increasing or decreasing.
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