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27 January, 06:51

Which of the following situations would cause the greatest decrease in the motion of molecules in a system?

A. Q = - 50 J, W = - 50 J B. Q = + 50 J, W = + 50 J C. Q = - 50 J, W = + 50 J D. Q = + 50 J, W = - 50 J

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  1. 27 January, 07:10
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    The answer is A. Q = - 50 J, W = - 50 J. A decrease in the motion of molecules in a system can be interpreted as a decrease or release in energy which means that energy should be negative. For the formula of energy:

    U = Q + W

    U is negative for the case of A. This gives the greatest decrease in the molecules' motion.
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