C7 Energy changes

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  • Created by: emews
  • Created on: 27-12-17 11:23
During a chemical reaction:
bonds in the reactants are broken and new bonds are made in the products.
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Energy is absorbed to break bonds. Endo or exo?
Bond-breaking is an endothermic process.
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Energy is released when new bonds form. Endo or exo?
Bond-making is an exothermic process.
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If more heat energy is released when making the bonds than was taken in, the reaction is what?
exothermic
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If more heat energy was taken in when making the bonds than was released, the reaction is what?
endothermic
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In an energy diagram. What is higher in an exothermic reaction? The reactants or products?
in exothermic reactions the reactants are higher than the products
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In an energy diagram. What is higher in an endothermic reaction? The reactants or products?
in endothermic reactions the reactants are lower than the products
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Energy transferred = mass of water heated ×...
specific heat capacity of water × temperature rise
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To calculate bond energy:
Add together the bond energies for all the bonds in the reactants – this is the ‘energy in’. Then add together the bond energies for all the bonds in the products – this is the ‘energy out’. Finally calculate energy change = energy in – energy out.
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Other cards in this set

Card 2

Front

Energy is absorbed to break bonds. Endo or exo?

Back

Bond-breaking is an endothermic process.

Card 3

Front

Energy is released when new bonds form. Endo or exo?

Back

Preview of the front of card 3

Card 4

Front

If more heat energy is released when making the bonds than was taken in, the reaction is what?

Back

Preview of the front of card 4

Card 5

Front

If more heat energy was taken in when making the bonds than was released, the reaction is what?

Back

Preview of the front of card 5
View more cards

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