Temperature dependence: per Arrhenius, raising T from 300 K to 310 K (Ea = 50 kJ/mol) increases k by approximately a factor of:
A1.2
B2 (rule of thumb: 10° rise → rate roughly doubles)
C10
D0.5
Answer & Solution
Correct answer: B. 2 (rule of thumb: 10° rise → rate roughly doubles)
For typical organic reactions with Ea around 50–100 kJ/mol, a 10° rise near room temperature roughly doubles the rate (Q₁₀ ≈ 2). Plug into k₂/k₁ = exp[Ea/R × (1/T₁ - 1/T₂)] to verify.
Related questions
It is observed that for many reactions the rate constant nearly doubles for a rise in tempThe half-life for the radioactive decay of carbon-14 is 5730 years and decay is first ordeIn a pseudo first order reaction, [A]/mol L^-1 reads 0.31 at t = 30 s and 0.17 at t = 60 sIn collision theory, what is meant by the collision frequency (Z)?According to collision theory, in the modified rate expression Rate = P Z_AB e^(-Ea/RT), wHow does a catalyst increase the rate of a chemical reaction?The first order rate constant for decomposition of ethyl iodide is 1.60 x 10^-5 s^-1 at 60The rate constants of a reaction at 500 K and 700 K are 0.02 s^-1 and 0.07 s^-1 respective