For a first-order reaction, the half-life t_(1/2) is:
A0.693/k (independent of initial concentration)
BInversely proportional to [R]₀
CEqual to 1/k
D[R]₀/(2k)
Answer & Solution
Correct answer: A. 0.693/k (independent of initial concentration)
First-order **t_(1/2) = ln(2)/k = 0.693/k**. **Independent of initial concentration** — a defining feature of first-order reactions. (Zero-order t_(1/2) = [R]₀/(2k) — depends on initial concentration.)
Related questions
Chemical kinetics studies the rate of a reaction and also its:Manganese dioxide is given as a catalyst for the decomposition of:A catalyst increases the rate of a reaction without itself being:Lowering the activation energy of a reaction makes the rate:Raising the temperature of a reaction makes the rate:The exponential factor gives the fraction of molecules with kinetic energy:Arrhenius was a chemist from:The physical justification of that equation was provided by: