The rate of reaction is doubled for every 10 °C rise in temperature. The increase in reaction rate as a result of temperature rise from 10 °C to 100 °C is:

In a first order reaction the concentration of reactant decreases from 800 mol/dm³ to 50 mol/dm³ in 2 × 10⁴ sec. The rate constant of reaction in sec^–1 is:

The rate constant of first order reaction is 3 × 10^–6 per second. The initial concentration is 0.10 M. The initial rate is:

For a first order reaction, to obtain a positive slope, we need to plot {where [A] is the concentration of reactant A}