Chemistry Unit 2

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  • Created by: camKD
  • Created on: 10-04-14 12:30
Why is the rate of reaction much faster with powder rather than chips
-larger surface area -therefore there can be more collisions with the acid particles
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Why might you test a blood sample at two different labs?
-to avoid bias -to improve reliability
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Explain how aluminium and carbon dioxide are formed via the electrolysis of aluminium oxide
-aluminium ions attracted to negative electrode -aluminium formed as aluminium ions gain electrons -oxide ions attracted to positive electrode -oxygen formed as oxide ions lose electrons -oxygen reacts with carbon to make carbon dioxide
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Explain why ammonia has a low boiling point
ammonia is made of simple molecular structures and so the intermolecular forces are weak
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Name ion in a solution that causes a pH of 10
hydroxide ion
5 of 8
Describe and explain how these used plastic bottles can be changed into new plastic objects.
used plastic bottles are heated then moulded into a new shape because the polymer chains in the plastic have weak intermolecular forces that allow these polymer chains to become mobile when heated
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Explain why sodium chloride has a high melting point
-sodium chloride has a giant structure of oppositely charged ions -the bonds between ions are strong therefore sodium chloride has a high melting point because a large amount of energy is needed to make the ions mobile
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For what reasons is a percentage yield of 100% not possible?
reversible reaction -some of product lost
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Card 2

Front

Why might you test a blood sample at two different labs?

Back

-to avoid bias -to improve reliability

Card 3

Front

Explain how aluminium and carbon dioxide are formed via the electrolysis of aluminium oxide

Back

Preview of the front of card 3

Card 4

Front

Explain why ammonia has a low boiling point

Back

Preview of the front of card 4

Card 5

Front

Name ion in a solution that causes a pH of 10

Back

Preview of the front of card 5
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