Ch.6 - Thermochemistry WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Identify each of the following energy exchanges as primarily heat or work and determine whether the sign of E is positive or negative for the system.a. Sweat evaporates from skin, cooling the skin. (T

Problem

Identify each of the following energy exchanges as primarily heat or work and determine whether the sign of E is positive or negative for the 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.)

Determine whether the sign of E is positive or negative for the system.