Energy Transfer and Bond Energies

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During chemical reaction what happens to old bonds?
Old bonds are brokken and new bonds are formed
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What is an endothermic reaction?
When energy is supplied to break existing bonds
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What is an exothermic reaction?
Energy is released when new bonds are formed
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In exothermic reactions what is greater? The energy released by forming bonds OR the energy used to break them?
The energy released by forming bonds
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In endothermic reactions what is greater? The energy released by forming bonds OR the energy used to break them?
The energy used to break them
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What does every chemical bond have associated with it?
A particular bond energy
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How can this bond energy vary?
It can vary slightly depending on the compound of the bonds
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What can you use the known bond energies to calculate?
The overall energy change for a reaction
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Card 2

Front

What is an endothermic reaction?

Back

When energy is supplied to break existing bonds

Card 3

Front

What is an exothermic reaction?

Back

Preview of the front of card 3

Card 4

Front

In exothermic reactions what is greater? The energy released by forming bonds OR the energy used to break them?

Back

Preview of the front of card 4

Card 5

Front

In endothermic reactions what is greater? The energy released by forming bonds OR the energy used to break them?

Back

Preview of the front of card 5
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