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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.

(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.

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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