Dilute hydrochloric acid reacts with marble chips (calcium carbonate) giving off carbon dioxide gas. Which solution of acid will have the fastest initial rate of reaction

A. $50 {\mathrm{cm}}^3$ of $0.5 \mathrm{mol} {\mathrm{dm}}^3$

B. $10 {\mathrm{cm}}^3$ of $1.0 \mathrm{mol} {\mathrm{dm}}^3$

C. $25 {\mathrm{cm}}^3$of $0.5 \mathrm{mol} {\mathrm{dm}}^3$

Why would B have the fastest initial rate of the reaction?

Which one of these explanations about the effect of increasing the concentration of the reactants on the rate of reaction is completely correct?

What is boltzmann distribution?

Explain why a $10 °\mathrm{C}$ rise in temperature can approximately double the rate of a reaction.

Which one of these statements about the Boltzmann curve is correct?

Explain whether the reaction below is an example of heterogeneous catalysis or homogeneous catalysis:

$2{\mathrm{SO}}_2\left(\mathrm{g}\right) + {\mathrm{O}}_2\left(\mathrm{g}\right) \stackrel{{\mathrm{V}}_2{\mathrm{O}}_5\left(\mathrm{s}\right)}{\rightleftharpoons } {\mathrm{SO}}_3\left(\mathrm{g}\right)$

Draw a reaction profile diagram to show a typical uncatalysed reaction and the catalysed version of the reaction. On your diagram show the activation energy for the catalysed and uncatalysed reactions.

Explain why gases react together faster at higher temperature.