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S2 Chemistry > Energy In Chemistry > Flashcards

Energy In Chemistry Flashcards

1
Q

What is an exothermic reaction?

A

Chemical reaction that gives out energy as bonds are formed.

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2
Q

What is an endothermic reaction?

A

Chemical reaction that takes in heat energy as bonds are broken.

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3
Q

What are some examples of exothermic reactions?

A

Neutralisation
Combustion
Displacement reactions
Dissolving
Hydration

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4
Q

What are some examples of endothermic reactions?

A

Thermal
Photosynthesis
Dissolving
Electrolysis
Thermal cracking of hydrocarbons

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5
Q

What are the steps to explain why a reaction is exothermic or endothermic?

A
  1. When bonds are broken energy taken in, this is an endothermic reaction.
  2. Bonds are broken in the…
  3. When bonds are formed energy given out, this is an exothermic reaction.
  4. Bonds are formed in the…
  5. Compare energy taken in to energy released between reactants and product.
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6
Q

What is the equation for energy change?

A

Energy change = energy taken in to break bonds - energy released when new bonds formed

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S2 Chemistry (6 decks)

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