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

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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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