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
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: