Thermochemical Equations
Flashcard
•
Science
•
9th - 12th Grade
•
Easy
Barbara White
Used 1+ times
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17 questions
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1.
FLASHCARD QUESTION
Front
Thermochemical Equation Noun
[thur-moh-kem-i-kuhl ee-kway-zhuhn]
Back
Thermochemical Equation
A balanced chemical equation that includes the physical states of all substances and the associated change in enthalpy (ΔH).
Example: This image shows a thermochemical equation in two ways: with heat as a product, and with a negative enthalpy change (ΔH), indicating an exothermic reaction.
2.
FLASHCARD QUESTION
Front
Enthalpy (ΔH) Noun
[en-thal-pee]
Back
Enthalpy (ΔH)
A quantity representing the total heat content of a system, where its change measures energy absorbed or released in a reaction.
Example: Adding heat to water increases its temperature and can cause it to boil, changing from a liquid to a gas. This change in heat content is called enthalpy change (ΔH).
3.
FLASHCARD QUESTION
Front
Exothermic Process Noun
[ek-soh-thur-mik pros-es]
Back
Exothermic Process
A process or reaction that releases energy, usually as heat, into its surroundings and has a negative ΔH value.
Example: This diagram shows burning wood, a combustion reaction. The equation shows reactants (wood, oxygen) becoming products (smoke, water) and releasing energy (ΔH), which is an exothermic process.
4.
FLASHCARD QUESTION
Front
Endothermic Process Noun
[en-doh-thur-mik pros-es]
Back
Endothermic Process
A process or reaction that absorbs energy, usually as heat, from its surroundings and has a positive ΔH value.
Example: The Earth absorbs energy from the sun, which is an endothermic process where a system (Earth) takes in heat from its surroundings (the sun).
5.
FLASHCARD QUESTION
Front
Combustion Noun
[kuhm-buhs-chuhn]
Back
Combustion
A chemical reaction between a fuel and an oxidizing agent, such as oxygen, that produces heat and light energy.
Example: This diagram shows a combustion reaction where a hydrocarbon fuel (like wood or charcoal) reacts with oxygen to produce heat, light, water, and carbon dioxide.
6.
FLASHCARD QUESTION
Front
Enthalpy of Combustion (ΔHcomb) Noun
[en-thal-pee uhv kuhm-buhs-chuhn]
Back
Enthalpy of Combustion (ΔHcomb)
The specific enthalpy change that occurs during the complete burning of one mole of a substance under standard conditions.
Example: A hydrocarbon (like charcoal) reacts with oxygen to produce carbon dioxide, water, and energy in the form of heat and light.
7.
FLASHCARD QUESTION
Front
Standard Enthalpy Change (ΔH°) Noun
[stan-derd en-thal-pee cheynj]
Back
Standard Enthalpy Change (ΔH°)
The enthalpy change of a reaction when all reactants and products are in their defined standard states at standard conditions.
Example: This diagram shows a simple calorimeter, a device used to measure the heat released or absorbed during a chemical reaction, which determines the enthalpy change.
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