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Analysing Substances
Chemical Analysis is very useful;
· Forensic science involves investigating substances
of a drivers blood or checking for the presence of
toxic substances in food and drink could provide
evidence for a court case.
· Its important to know what substances are present
in food. As nobody wants their food to be
contaminated by toxic substances. And some
people have allergic reactions to substances in
certain foods ­ e.g. some food additives, some
natural substances in nuts, etc.…read more

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Every day water companies check the purity of the
drinking water they provide by analysing tap water
for potentially dangerous chemicals
· As part of their quality control process,
manufacturers need too know that materials in
their products are of the required purity. For
example copper wire needs to be of high purity ­ if
its not pure enough, it doesn't conduct electricity as
well as it should. But not all users of a substance
need the same purity ­ copper for water pipes
doesn't need to be that pure for example.…read more

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It tells you WHAT is present. It might be used for
detecting poisons in food because you don't need to
know how much there is because even a trace can
cause problems.
Qualitative ­ shows you the Quality ­ it shows you
what is in it.…read more

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Tells you WHAT is present and HOW MUCH. This sort
of analysis would be used in drink-drive cases when
the police need to know how much alcohol is present
in the drivers blood. If the amount of alcohol is
greater than 80mg per 100ml of blood ­ the driver
can be prosecuted.
Quantitative ­ knows you the Quantity of the
chemical present.…read more

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Testing Ionic Compounds Means Identifying Two Different
Qualitative analysis could mean doing tests to work out the
identity of a mystery substance;
· Lots of substances are made up of different bits (e.g. ionic
substances all have a positive bit and a negative bit) For
these you can identify the different bits separately.
· So if your mystery substance is an ionic compound ­ you'd
carry out a series of experiments to identify the positive
ion, and another series of experiments to identify the
negative ion. E.g.
· The results of your 1st set of tests = copper(II) ions present
· The results of your 2nd set of tests = chloride ions present
· Mystery substance = copper(II) chloride…read more

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fay bower

very helpful

Zack Hachem

extremely helpful!


very very helpful! thanks

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