Unit 3: Energetics - reaction profiles

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10 Terms

1
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In exothermic reactions what is the energy of the products like in relation to reactants
Lower
2
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In endothermic reactions what is the energy of products like in relation to reactants
Higher
3
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If reaction is exothermic what is the value of enthalpy change
Negative - energy is given out
4
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If reaction is endothermic what is value of enthalpy change
Positive - reaction takes in energy
5
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Line from the reactants line to top of curve is what
Activation energy
6
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Line from reactants to products is what
Enthalpy change
7
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What is activation energy
The minimum amount of energy needed for the reactants to collide and react with each other
8
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What are bond breaking reactions
Endothermic
9
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What are bond forming reactions
Exothermic
10
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How do you use bond energies to calculate enthalpy change
Enthalpy change = total energy absorbed to break bonds - total energy released in making bonds