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Energy Changes in Chemical Reactions
Energy Changes in Chemical Reactions
Learning objectives
Learning objectives
Chapter 10 Topic 1: Introduction to Thermochemistry and Calorimetry - Sections 10.1, 10.2, 10.3 and 10.4
MLO7-1 Describe and employ basic Thermochemistry principles to identify an open, closed or isolated system and the surroundings and calculate energy from heat and work
MLO7-2 Explain enthalpy as a state function and identify a process as endothermic or exothermic
MLO7-3 Perform calorimetry calculations involving heat, specific heat or heat capacity.
MLO7-4 Use Hess's law, enthalpies of formation and bond energies to calculate heats of reactions, lattice energies or perform energy calculations that accompany reactions.
Chapter 10 Topic 1: Introduction to Thermochemistry and Calorimetry
Chapter 10 Topic 1: Introduction to Thermochemistry and Calorimetry
Chapter10-ThermoIntroducton.mp4Chapter 10 Unit 1 - Introduction to Thermochemistry, heat and enthalpy
Introduction to Thermochemistry and Enthalpy
Tyler DeWitt - An introduction to the ideas of heat energy, enthalpy, thermochemistry, and delta H.
Energy Transfer
Energy Transfer
048 - Energy Transfer
In this video Paul Andersen explains how energy can be transferred from one system to another. In a closed system the energy can be transferred as either work or heat. Thermal energy transfer is know as energy transfer through heat. During energy transfer the energy of the entire system is conserved.
Enthalpy of Reaction
Enthalpy of Reaction
053 - Enthalpy of Reaction
In this video Paul Andersen explains how the enthalpy of a reaction can be released in an exothermic or consumed in an endothermic reaction. According to Hess's law if the reaction is reversed the sign of the enthalpy of reaction is also reversed. The overall enthalpy of reaction is the sum of all the individual reactions. A couple of enthalpy of reaction problems are worked out as well.
Tricky Question: Exothermic or Endothermic?
Tricky Question: Exothermic or Endothermic?
https://youtu.be/i3mYWB2fNp4 Duration 3:12 minutes
Tyler DeWitt - Is this process exothermic or endothermic? Actually, it depends on what we consider the system, and what we consider the surroundings. Every process can be exothermic or endothermic, depending on your point of view.
Specific Heat and Heat Capacity - Using Temperature to measure Heat.
Specific Heat and Heat Capacity - Using Temperature to measure Heat.
Chapter10-Calorimetr.mp4Chapter 10 Topic 1 - Calorimetry
Videos and Tutorials by Tyler DeWitt
Food Calorimetry Lab: Explanation - https://youtu.be/uv7sVIqgyqU
Food Calorimetry Lab: Calculations - https://youtu.be/Ak7PN8tn4cU
Food Calorimetry: Common Mistakes - https://youtu.be/1Ml-Bg81BVI
Calorimetry
Calorimetry
Bozeman Science - 051 - Calorimetry
In this video Paul Andersen describes the history of calorimetry and explains how it can be used to measure energy changes in a system. The specific heat of water is well established and so as a system releases or absorbs energy from a surrounding water bath it can be measured. Calorimeters can be used to measure the specific heat capacity of a substance as well as the enthalpy of fusion, vaporization, and reaction.
Heat Capacity and Specific Heat - Chemistry Tutorial
Heat Capacity and Specific Heat - Chemistry Tutorial
This chemistry tutorial covers the difference between heat capacity and specific heat and includes several examples of how to find specific heat and how to use specific heat in calculations.
Chapter 10 Topic 2: Hess's Law
Chapter 10 Topic 2: Hess's Law
This is a discussion of Hess's Law and
Activity 14
Tyler DeWitt's video on Thermochemical Equations Practice Problems
Thermochemical Equations Practice Problems - https://youtu.be/8m_FCe5aCqY
A simulation showing the addition of reactions and the resulting Enthalpy of reaction:
Heat of formation | Thermodynamics | Chemistry | Khan Academy
Heat of formation | Thermodynamics | Chemistry | Khan Academy
Standard heat of formation or standard enthalpy change of formation. How heats of formation are calculated. Created by Sal Khan.
Hess's law and reaction enthalpy change | Chemistry | Khan Academy
Hess's law and reaction enthalpy change | Chemistry | Khan Academy
Using Hess's Law and standard heats of formation to determine the enthalpy change for reactions. Created by Sal Khan.
Hess's law example | Thermodynamics | Chemistry | Khan Academy
Hess's law example | Thermodynamics | Chemistry | Khan Academy
Hess's law example. Created by Sal Khan.
Hess's Law and Heats of Formation
Hess's Law and Heats of Formation
How can we calculate the enthalpy change of a reaction without doing it? There are two easy ways! This is how we can make sure a reaction won't explode in our faces!
Thermochemistry questions with solutions
Bond Length and Bond Energy
Bond Length and Bond Energy
052 - Bond Length and Bond Energy
In this video Paul Andersen explains how the bond length and bond energy are calculated using an energy distance graph. The strength of the bond is determined by the charges in the constituent atoms. As the charge increases the bond energy increases and the bond length decreases. Increasing numbers of bonds will also increase the energy and decrease the length.
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