# Worksheet: The Arrhenius Equation

In this worksheet, we will practice using the Arrhenius equation to calculate reaction activation energies and frequency (preexponential) factors.

**Q3: **

Butene can decompose to two molecules of ethene when heated.
The rate constant for the decomposition reaction at is s^{−1} and the activation energy is
261.0 kJ/mol. Estimate the frequency (preexponential) factor for the reaction, to 2 significant figures.

- A s
^{−1} - B s
^{−1} - C s
^{−1} - D s
^{−1} - E s
^{−1}

**Q4: **

The rate constant for a reaction, , was measured over a range of reaction temperatures, . The data were plotted on a graph of against . What is the frequency (preexponential) factor for the reaction in terms of the gradient of the plot and the -intercept ?

- A
- B
- C
- D
- E

**Q5: **

Hydrolysis of the sugar sucrose () produces glucose and fructose. This first-order reaction has a rate constant of at and at .

Calculate the activation energy for this reaction, to three significant figures.

Calculate the rate constant for this reaction at , to two significant figures.

- A s
^{−1} - B s
^{−1} - C s
^{−1} - D s
^{−1} - E s
^{−1}

Estimate, to two significant figures, the time needed for the concentration of a 0.150 M sucrose solution to decrease to M at .

- A days
- B days
- C days
- D days
- E days