Verla
ChemistryGeneral Chemistry

Identify Energy Exchanges as Primarily Heat or Work and Determine the Sign of ΔE

Classify sweat evaporation, balloon expansion and flame heating as heat or work and assign each defined system its energy-change sign.

Question

Identify each energy exchange as primarily heat or work and determine whether the sign of ΔE is positive or negative for the stated system. (a) Sweat evaporates from skin, cooling the skin. (The evaporating sweat is the system.) (b) A balloon expands against an external pressure. (The contents of the balloon is the system.) (c) An aqueous chemical reaction mixture is warmed with an external flame. (The reaction mixture is the system.)

This question has been answered.

Explore the full answer and supporting references to better understand this question.

Verla BasicBest value

$19.99/month

  • Everything in Study Pass
  • Assignments with writing output
  • AI detection and humanizer
  • Basic quotas across every tool
Study Pass

$0.99/month

  • Entire question library
  • Knowledge guides and sources
  • Detailed answers and explanations
  • No AI tools or quotas

Evidence boundary

The signs refer to the system named in each part and to the primary energy exchange requested by the exercise. Without measured heat and work values, this classification does not quantify every simultaneous transfer.