Problem- 1 a particular radioactive isotope has a half life, Ask an Expert

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Problem- 1) A particular radioactive isotope has a half life of 2.70 weeks. What fraction of the original sample is left after 56.7 days?

2) Which of the following statements is not true of electrolysis?

a) The electrolysis of water produces hydrogen gas and oxygen gas.

b) Electrolysis is used to recharge a lead storage battery.

c) Electrolysis is a process where electrical energy is used to produce a chemical change

d) None of these; that is, all these statements are true.

e) Electrolysis involves forcing a current through a cell to produce a change thta would otherwise not occur.

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