bond energy lesson

​There is an inbetween stage in a reaction where reactants are separated into atoms.

This state is high energy and unstable so it requires effort to occur.

​Activation energy

Labelling

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forming bonds

breaking bonds

Labelling

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breaking bonds

forming bonds

Reorder

Put the pictures in the order they occur for this reaction

1

2

3

• 1
• 2
• 3

Reorder

Put the pictures in the order they occur for this reaction

1

2

3

• 1
• 2
• 3

​Each bond has an energy value in KJ/mol
This number is positive when breaking & negative when forming

Bond energy reflects bond strength. A single bonded C-C is 345 and C=C is 602.

Labelling

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absorb energy

release energy

Labelling

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absorb energy

release energy

Labelling

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exothermic

endothermic

Labelling

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exothermic

endothermic

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This action is ​

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and the bond energies will be ​

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numbers

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exothermic

negative

positive

endothermic

​Comparing breaking and forming for the same reaction

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(+) positive number

(-) negative number

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(-) negative number

(+) positive number

​Forming water is overall exothermic 1362-1856 = -494

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The O=O bond in this reaction is going to ​

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and the energy will be​

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break

497

form

-497

336

-336

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The O-H bond will form with an energy of .......

-

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How many H-H bonds are in this equation ?

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How many Cl-Cl bonds are in this equation ?

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How many H-Cl bonds are in this equation ?

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How many C-H bonds are in the reactants ?

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How many C-H bonds are in the products

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How many C-O bonds have to form in this reaction ?

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What is the energy value for when the 2 C-O bonds form

-

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Add up all the bond energies in the reactants

​C-H
414 x4

​+

​O=O
498 x2

​= 2652

Fill in the Blank

Add up all the bond energies in the products

​C=O
803 x2

​+

​O-H
464 x4

​= 3462

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if energy in = 2652

if energy out = -3462

Total energy change is .....

-

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Calculate the energy required to break these bonds

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Bond breaking takes 3190.

Calculate the total energy change for this reaction

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Calculate the overall energy change for this reaction

-

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This reaction has an overall energy change of -185 so it is ​

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and a nearby thermometer reading would​

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exothermic

rise

fall

endothermic

Fill in the Blank

Calculate the overall energy change for this reaction

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This reaction has an overall energy change of 103 so it is ​

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and a nearby thermometer reading would​

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exothermic

rise

fall

endothermic