Catalysts

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  • Created by: J.E.C.
  • Created on: 13-04-14 14:22
Define 'catalyst'?
A substance which speeds up a reaction but can be recovered chemically unchanged at the end.
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The process of speeding up a chemical reaction using a catalyst is called?
Catalysis
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Catalysts do no undergo any permanent chemical change, but can be changed...?
physically
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Homogeneous catalysts are where the...?
Reactants and catalysts are in the same physical state.
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How are heterogeneous catalysts different and what does this reaction usually involve?
Reactants and catalysts are in different physical states. Usually involves a mixture of gases or liquids reacting in the presence of a solid catalyst.
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With heterogeneous catalysts, the reactants are ___ onto the surface, as a result bonds in the reactant ___ and ___. New bonds then form between the reactants, held close together on the surface, to form the products, this in turn...?
adsorbed, Sweakens the bonds to the catalyst surface and the product molecules are released
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Solid catalysts are used in a ___ ___ form or as a ___ ___ ___?
finely divided, fine wire mesh
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Explain how a catalyst may be poisoned?
'Poison' molecules are adsorbed more strongly to the catalyst surface than reactant molecules. These poison molecules make the catalyst inactive by blocking its active sites.
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Other cards in this set

Card 2

Front

The process of speeding up a chemical reaction using a catalyst is called?

Back

Catalysis

Card 3

Front

Catalysts do no undergo any permanent chemical change, but can be changed...?

Back

Preview of the front of card 3

Card 4

Front

Homogeneous catalysts are where the...?

Back

Preview of the front of card 4

Card 5

Front

How are heterogeneous catalysts different and what does this reaction usually involve?

Back

Preview of the front of card 5
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