Chapter 6
Thermochemistry
By Boundless
The enthalpy of reaction measures the heat released/absorbed by a reaction that occurs at constant pressure.
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Endothermic reactions absorb energy from the environment, while exothermic reactions release energy to the environment.
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Thermochemical equations are chemical equations which include the enthalpy change of the reaction,
Heat capacity is a measure of the amount of heat energy required to change the temperature of a pure substance by a given amount.
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Constant-volume calorimeters, such as bomb calorimeters, are used to measure the heat of combustion of a reaction.
A constant-pressure calorimeter measures the change in enthalpy of a reaction at constant pressure.
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The standard enthalpy of formation refers to the enthalpy change when one mole of a compound is formed from its elements.
The standard enthalpy of reaction is the enthalpy change that occurs in a system when a chemical reaction transforms one mole of matter under standard conditions.
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Hess's Law sums the changes in enthalpy for a series of intermediate reaction steps to find the overall change in enthalpy for a reaction.
![Thumbnail](../../../../../figures.boundless-cdn.com/9698/square/nacl-20in-20water.jpg)
Heat of solution refers to the change in enthalpy when a solute is dissolved into a solvent.
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Present sources of energy include fossil fuels, various types of renewable energy, and nuclear power.
![Thumbnail](../../../../../figures.boundless-cdn.com/10205/raw/global-carbon-emissions.jpg)
Energy consumption is directly related to climate change.
![Thumbnail](../../../../../figures.boundless-cdn.com/10208/square/omaly-1880-2010-28fig.a-29.gif)
One of the major environmental problems associated with fossil fuel use is global warming.
![Thumbnail](../../../../../figures.boundless-cdn.com/27493/square/saccharum-officinarum-harvest.jpg)
Alternative and renewable energy sources can reduce the environmental impact of energy production and consumption.