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 Form 4 Chemistry Paper 2 Sample Revision Questions With Answers

(a) The table below shows the radioactive decay for a sample of iodine -131. Study it and answer the questions that follow.
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(i) Plot the decay curve of iodine -131 using the data given in the table above.
(ii) Use the graph to determine the half-life of the sample.
(iii) What fraction of the original sample remains after 18 days?
(b) The diagram below shows some properties of nuclear radiations.
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Identify the radiation represented by letter Q. Give reason.
c) State one way in which radioisotopes poses danger to the environment.

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Answer Text:
a).i)Graph
ii). 8 days
b). #80/400= 1/5#
c) Causes different forms of cancer, genetic mutations through ionization.


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