Which of the following is the best definition of half-life for a radioactive substance?
2 answers:
This is an incomplete question, here is a complete question.
Which of the following is the best definition of half-life for a radioactive substance?
A. Half of the amount of time required for all of the radioactive atoms to decay.
B. The amount of time required for half of the radioactive atoms to decay.
C. The amount of time required for each radioactive atom to decay halfway.
D. All of the above.
Answer : The correct option is, (B) The amount of time required for half of the radioactive atoms to decay.
Explanation:
Half life : It is defined as the amount of time taken by a radioactive material to decay to half of its original value.
All radioactive decays follow first order kinetics.
The relation between the half-life and rate constant is:
The half-life of the radioactive isotope is remains the same that means a constant value and it is not affected by any external conditions.
Hence, the correct option is, (B)
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Answer : The full balanced ionic equation will be,
Reactants are lead nitrate and potassium iodide.
Products are lead iodide and potassium nitrate.
The spectator ions are,
Explanation :
Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.
Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
When potassium iodide react with lead nitrate then it gives potassium nitrate and lead iodide as a product.
The full balanced ionic equation will be,
The ionic equation in separated aqueous solution will be,
In this equation, are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
Answer:
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