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
Sections
Nature of Energy
Kinetic & Potential Energy
First Law of Thermodynamics
Internal Energy
Endothermic & Exothermic Reactions
Heat Capacity
Constant-Pressure Calorimetry
Constant-Volume Calorimetry
Thermal Equilibrium
Thermochemical Equations
Formation Equations
Enthalpy of Formation
Hess's Law
Additional Guides
Enthalpy

Mechanical Energy is the energy associated with an object's velocity (Kinetic Energy) and its position (Potential Energy). 

Kinetic Energy & Potential Energy

Concept #1: Kinetic & Potential Energy

The kinetic energy of a gas molecule is connected to its mass in kilograms and velocity in meters per second. 

The potential energy of a gas molecule is connected to its mass, acceleration due to gravity and height above the ground. 

Example #1: Calculate the kinetic energy (in kJ) of an electron (m = 9.11 x 10-31 kg) moving at 1.59 x 1020 m/s.

Practice: A radioactive particle weighing 7.20 x 103 ng is found 110 m above the earth’s surface. What is its potential energy?

Concept #2: Energy Interconversions

Example #2: A neutron weighing 1.67 x 10-27 kg is shot from a laser projector that is mounted 120.0 meters above the ground. What is its speed when it hits the ground?