28. Part A Assuming constant pressure, rank these reactions from most energy rel

Question

28. Part A

Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions:

Surroundings get colder and the system decreases in volume.

Surroundings get hotter and the system expands in volume.

Surroundings get hotter and the system decreases in volume.

Surroundings get hotter and the system does not change in volume.

Also assume that the magnitude of the volume and temperature changes are similar among the reactions.

Rank from most energy released to most energy absorbed. To rank items as equivalent, overlap them. A, B, C, D

Most energy released =

Most energy absorbed =

Explanation / Answer

Surroundings get cloder means system absorbs the energy from surroundings. Surroundings get hotter menas system releases the energy to the surroudings.

Volume decreases menas system absorbs energy that means work done on the sytem. System expands means work done by the system and energy released by the system.

A) Surroundings get colder and the system decreases in volume = energy absorbed + energy absorbed

B) Surroundings get hotter and the system expands in volume = energy released + energy released

C) Surroundings get hotter and the system decreases in volume =energy released + energy absorbed

D) Surroundings get hotter and the system does not change in volume = energy released + no change

Highest energy released in B and highest energy absorbed in A.

Order of the descriptions from most energy released to most energy absorbed is as follows

   B > D > C > A

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