AS Chemistry OCR B (Salters) DF - Catalysts

A quiz on catalysts from Unit 1 Module 2 of Salters Chemistry AS.

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  • Created on: 17-12-08 13:18

1. What is the correct definition of a catalyst?

  • A catalyst speeds up a chemical reaction, but can be recovered chemically unchanged at the end of a reaction.
  • A catalyst speeds up a reaction, and can generally be recovered chemically unchanged at the end of a reaction.
  • A catalyst slows down a reaction, but can be recovered chemically unchanged at the end of a reaction.
  • A catalyst speeds up a reaction, but cannot be recovered chemically unchanged at the end of a reaction.
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2. Definition: "The speeding up of a chemical reaction using a catalyst"

  • Catalysation
  • Catalysis
  • Catalysion
  • Catalan
  • Catalyst usage

3. Catalysts can often be reused, and only a tiny amount is needed for a large reaction. Why is this?

  • Because they are either chemically unchanged by the end of the reaction, or have reacted and remade.
  • Because the large surface area ensures all of the reactants are exposed to the catalyst.
  • Because they can often be recovered chemically unchanged at the end of a reaction.
  • Because they are, by nature, very powerful.

4. Catalysts are ......... which means they will ............

  • specific to certain reactants, often only work on a single reaction.
  • Hungry, go to KFC tomorrow.
  • Non-specific, catalyse many reactions.
  • large in surface area, catalyse a large amount of reactants fast.

5. What does the term "homogeneous catalyst" mean?

  • The catalyst is from the same periodic group as the reactants.
  • The catalyst is in a different physical state than the reactants.
  • The catalyst is in the same physical state as the reactants.
  • The catalyst is from a different planet than the reactants.
  • The catalyst has the same electrostatic charge as the reactants.
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Comments

Matthew Hamer

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nice

beth

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helpful

Lauren Lovick

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helpful (even though I am doing AQA chem) It was quite good because the questions were not too easy

pooja patel

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very helpful thanks!

Jhyzone

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i see your tricky strategy!

I'm off to revise more DF! :D

Thanks for this!

Mazin

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lol that was funny but nice and concise ;]

Taslima Baksh

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very good but please make more- i need it!!!

Emma

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how do you find out the right answers if you get something wrong? Very good though :)

fmPerkins

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That was really helpful! I think I need to go back to Ideas and read up on homogeneous and heterogeneous :)

Nazmeen Chowdhury

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Really Good!!! will try it again when it's closer to exam time!

Elana Bryan

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Really good! A very useful recap!

Marianne Bradley

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Useful, thank you :)

Beenash

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Thanks, really helped! :)

WhatsHisFace

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Thanks, really helped! :)

Em

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Really useful, it was good that the questions weren't too easy, but they summarised the key points!!

Francesco D'Alessio

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Really helpful , 

Needed this.

Cesi  

claude bethy

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good

Vicky

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2wrong

i say pretty good for me :)

AnnaLouise

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It was good thank you :-) x

kayley lucken

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question 6 is wrong it should be aBsorbtion not aDsorbsion

kidun

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Really good! A very useful :)

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