Chemistry - Energy changes

Burning wood (combustion) is an example of a ___ reaction
Exothermic reaction (energy exits to surroundings from the reaction)
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What would happen to temperature of surroundings in exothermic reaction?
Increases/get's hotter
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List some other examples of exothermic reactions...
Oxidation and neutralization
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Energy change can be shown through an ___ ___ diagram
energy profile diagram
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In an exothermic reaction, the products have __ energy then reactants
Less
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Why is this?
Energy transferred (loss) from reaction to surroundings
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____ reactions take in energy from surroundings
Endothermic
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What happens to temperature of surrounds in endothermic reaction?
Decreases/get's colder
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Why?
Energy (heat) is being taken in from surroundings in reaction
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Thermal decomposition is an example of a ___ reaction
Endothermic
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In endothermic reaction, products have ___ energy then reactants
More (energy is being taken in)
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What's activation energy?
Minimum energy particles require for reaction to take place
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Why is activation energy required?
Particles need energy to collide efficiently so they can react
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When calculating energy change, __othermic will always be a positive number, and __othermic will always be a negative
Endothermic is positive (shows gain of energy). Exothermic is negative (loss of energy)
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What is required to break a bond?
Energy
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So what kind of reaction is breaking bonds?
Endothermic
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Making bonds releases energy so is a ___ reaction
Exothermic
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Every chemical bond has an energy value that tells us...
Energy required to break bond
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How do you calculate energy change (you'll be given energy values inn exam)
Reactant total energy value - product total energy value
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If the energy change is a negative number, its a __ reaction because...
Exothermic because energy has been lost (released into surroundings)
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Other cards in this set

Card 2

Front

What would happen to temperature of surroundings in exothermic reaction?

Back

Increases/get's hotter

Card 3

Front

List some other examples of exothermic reactions...

Back

Preview of the front of card 3

Card 4

Front

Energy change can be shown through an ___ ___ diagram

Back

Preview of the front of card 4

Card 5

Front

In an exothermic reaction, the products have __ energy then reactants

Back

Preview of the front of card 5
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