Intro to Thermo + Bond Energy

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•
Chemistry
•
9th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an endothermic reaction?
Back
An endothermic reaction is a chemical reaction that requires energy input, usually in the form of heat, resulting in a temperature drop in the surroundings.
2.
FLASHCARD QUESTION
Front
What is an exothermic reaction?
Back
An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat, resulting in a temperature increase in the surroundings.
3.
FLASHCARD QUESTION
Front
What does ΔH represent in a chemical reaction?
Back
ΔH represents the change in enthalpy, or heat content, of a system during a chemical reaction.
4.
FLASHCARD QUESTION
Front
What happens to bond energy when a chemical bond is broken?
Back
Breaking a chemical bond requires energy, which is absorbed from the surroundings.
5.
FLASHCARD QUESTION
Front
What happens to bond energy when a chemical bond is formed?
Back
Forming a chemical bond releases energy, which is given off to the surroundings.
6.
FLASHCARD QUESTION
Front
How do you calculate the reaction energy using bond energies?
Back
To calculate reaction energy, sum the bond energies of the reactants and subtract the sum of the bond energies of the products.
7.
FLASHCARD QUESTION
Front
What is the bond energy of an O=O bond?
Back
The bond energy of an O=O bond is 494 kJ.
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