Chemistry

  • Created by: chhaya
  • Created on: 11-10-16 17:03
How do you calculate rate of reaction?
amount of reactant used ÷ time or amount of product formed ÷ time
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Why are catalysts good?
they can reduce the costs of some industrial processes
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What is the activation energy?
the minimum amount of energy particles must have to react
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When is the only time chemical reactions occur?
When particles collide with eachother with the sufficient energy
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How can you increase the rate of reaction?
Increase temperature-increases speed of reacting particles so they collide more frequently and energetically Increase pressure of reacting gas Increase surface area of solid reactants Increase concentration of reactants in solutions They all increase
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What is a catalyst?
something that changes the rate of a chemical reaction but is not used up during the reaction
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What do chemical reactions involve?
energy transfers
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Many chemical reactions involve...
the release of energy
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What happens when chemical reactions occur?
Energy is transferred to the surroundings
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What is an exothermic reaction and give an example
a reaction that transfers energy to the surroundings e.g. oxidation, combustion, hand warmers
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What is an endothermic reaction and give an example
a reaction that takes energy from the surroundings e.g. thermal decomposition, sports injury ice packs
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What is a reversible reaction?
One that is endothermic one way and exothermic the other way or vice versa, the same amount of energy is transferred in each direction
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What is an example of a reversible reaction?
hydrated copper sulphate --->androhydrous + water copper sulfate (endothermic reaction -->, exothermic in the opposite)
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Other cards in this set

Card 2

Front

Why are catalysts good?

Back

they can reduce the costs of some industrial processes

Card 3

Front

What is the activation energy?

Back

Preview of the front of card 3

Card 4

Front

When is the only time chemical reactions occur?

Back

Preview of the front of card 4

Card 5

Front

How can you increase the rate of reaction?

Back

Preview of the front of card 5
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