C7.3 - Reaction Profiles (Finished) Flashcards

1
Q

What do reaction profiles show?

A

The relative amounts of energy contained in the reactants and products in a reaction, and how the energy changes over the course of the reaction

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2
Q

What is energy in reactants/products measured in?

A

Kj/mol kilojoules per mole

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3
Q

How are reaction profiles drawn?

A

A curved line, from the reactants to products

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4
Q

What does the peak of the curve In a reaction profile show?

A

The energy input required for the reaction to take place. The activation energy

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5
Q

What does an exothermic reaction profile look like?

A


—- -
-
-
-
—–

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6
Q

What does the reaction profile of an endothermic reaction look like?

A


- —–
-
-
-
-
—–

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7
Q

What does the difference in energy between the reactants energy and products energy show?

A

The amount of energy released/absorbed from the environment; the energy change during the reaction, measured in KJ/mol

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8
Q

What is the activation energy?

A

The minimum amount of energy needed before colliding particles of reactants (have enough energy to) cause a reaction

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9
Q

Where is the activation energy seen on a reaction profile?

A

Between the energy level of the reactants and top of the curve

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10
Q

Is bond breaking or bond making exothermic?

A

Bond making

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11
Q

Why is bond making exothermic?

A

Because the particles need to loose energy so they can come together (energy is no longer overcoming forces) and form a bond

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12
Q

Why is bond breaking endothermic?

A

Because particles need to be given energy until they have enough to escape the forces holding them together (to break the bond)

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13
Q

What happens if colliding particles of reactants collide with less energy than the activation energy?

A

They just bounce off eachother

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14
Q

Why are endothermic reactions endothermic?

A

The energy released when new bonds are formed is greater than the energy put in to break the original bonds

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