A student performs four tests to study the rate of reaction between $3.0\,\text{g}$ of calcium carbonate and hydrochloric acid. $\text{CaCO}_3(s) + 2\text{HCl}(aq) \rightarrow \text{CaCl}_2(aq) + \text{CO}_2(g) + \text{H}_2\text{O}(l)$ test 1: $\text{CaCO}_3$ powder + $2.0\,\text{mol dm}^{-3}\,\text{HCl}$ at $35\,^\circ\text{C}$ test 2: $\text{CaCO}_3$ powder + $2.0\,\text{mol dm}^{-3}\,\text{HCl}$ at $35\,^\circ\text{C}$ test 3: large chips of $\text{CaCO}_3$ + $1.0\,\text{mol dm}^{-3}\,\text{HCl}$ at room temperature test 4: large chips of $\text{CaCO}_3$ + $1.0\,\text{mol dm}^{-3}\,\text{HCl}$ at $35\,^\circ\text{C}$ The student gathers the $\text{CO}_2(g)$ and measures the time needed to obtain the same gas volume in each test. Which set of times could be correct for the four tests?
Chemistry 9701 · AS & A Level · Reaction kinetics