An excess of dilute hydrochloric acid is put into two separate experiments containing equal masses of powdered calcium carbonate. The hydrochloric acid has two different concentrations. In both experiments, the temperature is kept the same. The results show how the mass of the reaction flask changes with time. Why is the rate of reaction for the $1.0\,\text{mol dm}^{-3}$ hydrochloric acid slower?
- Acollision energy lower; collision rate higher
- Bcollision energy lower; collision rate lower
- Ccollision energy same as for $2.0\,\text{mol dm}^{-3}$; collision rate higher
- Dcollision energy same as for $2.0\,\text{mol dm}^{-3}$; collision rate lower