« previous | 7 of 26 | next » Classify the following by the sign of A E for the

Question

« previous | 7 of 26 | next » Classify the following by the sign of A E for the system Drag the appropriate items to their respective bins. If no definitive classification can be made, drag the item into the bin labeled "Not enough data." Hints Reset] [ Help The system expands The system expands The system contracts and the surroundings and the surroundings and the surroundings get hotter get colder. get hotter The system contracts and the surroundings get colder Negative Positive Not enough data

Explanation / Answer

Note that

dE = Q - W

if the surroundings do work on the system, and gives heat to the system, then this increases in dE

a)

system expands --> loss of work, i.e. dE decreases

surroundings get colder --> abosrbing heat, so +Q, then dE increases

not enough data, we need numerical values

b)

system expands --> loss of work, i.e. dE decreases

surroundings get hotter --> system is giving off energy --> dE decreases

then, this is NEGATIVE, i.e. dE decreases overall

c)

system contracts --> gain of work, i.e. dE increases

surroundings get hotter --> system is giving off energy --> dE decreases

not enough data, we need numerical values

d)

system contracts --> gain of work, i.e. dE increases

surroundings get colder --> system is receiving energy --> dE increases

then, this is POSITIVE , i.e. dE increases overall

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.