Decide whether the two quantities listed in the left column must have the same s

Question

Decide whether the two quantities listed in the left column must have the same sign, must have opposite signs, or if they could be either the same or opposite.

H and S for a phase change

either            opposite            same      

H and S for a chemical reaction

either            opposite            same      

S for a system and its surroundings during a phase change

either            opposite            same      

S for a system and the universe

either            opposite            same      

Explanation / Answer

H and S for a phase change

either            opposite            same      

for a phase change like when water change from solid to liquid then H and S both are negative but in the opposite condition means from liquid to solid H and S both are positive in same quantity hence we can say opposite in sign with same quantity.

H and S for a chemical reaction

either            opposite            same   

are opposite.

S for a system and its surroundings during a phase change

either            opposite            same      

S for a system and its surroundings during a phase change are opposite in sign but same in amount like when ice change into Water then entropy of system increases while the entropy of surrounding decreases.

S for a system and the universe

either            opposite            same   

                               Delta S Universe = Delta S system + Delta S surroundings

S for a system and its surroundings during a phase change are opposite in sign but same in amount like when ice change into Water then entropy of system increases while the entropy of surrounding decreases thus the entropy of universe is constant

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