Bond Energy for Exothermic and Endothermic Reactions

All about the activation energies and bond energies of reactants involved in exothermic and endothermic reactions.

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Which sort of reaction, exothermic or endothermic, has the highest activation energy needed for breaking the bonds between atoms in the reactants?
Endothermic.
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Which reaction releases more energy to the surroundings?
Exothermic.
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Give a definition for bond energy.
The amount of energy needed to break (or make) a particular chemical bond, given in kJ/mol.
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The energy change from reactants to products in an exothermic reaction is negative. How do we know this?
The energy present in the products is less than in the reactants. The difference between the two is the amount of energy that has been released to the surroundings, which can warm them.
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The bond energy needed to break C-C (single-bonded carbon atoms) is 347 kJ/mol. What amount of bond energy is released making C-C?
347 kJ/mol. It is the same amount as bond energies are the same for making bonds as they are for breaking bonds.
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If the energy required to break bonds is smaller than the energy released when bonds are made, will the reaction be exothermic or endothermic?
Exothermic.
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Other cards in this set

Card 2

Front

Which reaction releases more energy to the surroundings?

Back

Exothermic.

Card 3

Front

Give a definition for bond energy.

Back

Preview of the front of card 3

Card 4

Front

The energy change from reactants to products in an exothermic reaction is negative. How do we know this?

Back

Preview of the front of card 4

Card 5

Front

The bond energy needed to break C-C (single-bonded carbon atoms) is 347 kJ/mol. What amount of bond energy is released making C-C?

Back

Preview of the front of card 5
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