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: Under what conditions will the quantities q and w be negative numbers?


Under what conditions will the quantities q and w be negative numbers?


We are being asked to determine the conditions when q (heat) and w (work) are negative (-).

Recall the heat, q and work, w of the system are used to calculate the internal energy (ΔE or ΔU) of a system.

The relationship between internal energy, heat, and work is shown in the following equation:


ΔU = internal energy, J
q = heat, J
w = work, J

We can identify the sign for q and w by knowing its source or direction: the system or the surroundings

Solution BlurView Complete Written Solution