The half-life of a radioactive isotope depends on how much material yon start wi
ID: 1018299 • Letter: T
Question
The half-life of a radioactive isotope depends on how much material yon start with. A gamma ray requires more shielding to block than a beta-ray. Beta rays consist of the nuclei of helium atoms Using electrochemistry, some reactions which are non-spontaneous can be made to occur. Redox reactions can be split into half-reactions where one substance is oxidized, and a different substance is reduced. In a redox reaction, the reducing agent is the substance that gets reduced. If an electrochemical cell has E degree = 0.00V, then the reactions are at equilibrium. A "concentration cell" shows that even differences in concentration of a single substances can be made to do electrical work. It is possible for tritium to decay by alpha particle emission. The oxidation state of the Mn atom in MnO_4^- is +7.Explanation / Answer
151. F
Half-life (abbreviated t12) is the time required for a quantity to reduce to half its initial value
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Gamma rays require the heaviest shielding of all the common types of nuclear radiation because gamma rays have the highest energy.
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A reducing agent is oxidized, because it loses electrons in the redox reaction
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158. F
159. F tritium decay by beta particlas
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