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: The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. If the caterpillar is the system, can you predict the sign of q as the caterpillar climbs?

Solution: The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. If the caterpillar is the system, can you predict the sign of q as the caterpillar climbs?

Problem

The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. Photograph of a caterpillar climbing a twig.

If the caterpillar is the system, can you predict the sign of q as the caterpillar climbs?

Solution

We’re being asked if we can predict the sign of q as the caterpillar climbs if the caterpillar is the system.

The internal energy(ΔE or ΔU) of a system can be calculated from the heat and work of the system. The relationship between internal energy, heat, and work is shown in the following equation:


U = q + w

where

ΔU is the total change in internal energy of a system,

q is the heat exchanged between a system and its surroundings, and

w is the work done by or on the system.

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