Predict Rate Changes Practice Test

In a lab, magnesium ribbon reacts with hydrochloric acid to produce hydrogen gas (bubbling):

$\text{Mg(s)} + 2\text{HCl(aq)} \rightarrow \text{MgCl}_2\text{(aq)} + \text{H}_2\text{(g)}$

A student runs the reaction at 22°C using 1.0 M HCl and the same length of magnesium ribbon each time. They propose warming the acid to 35°C while keeping everything else the same.

How will the reaction rate change, and why (use collision theory)?

A student adds equal masses of calcium carbonate (CaCO$_3$) to identical cups containing 100 mL of 1.0 M vinegar (acetic acid) at 22°C. In Cup A, the CaCO$_3$ is in large chips. In Cup B, the CaCO$_3$ is crushed into a fine powder. All other conditions are the same. Which prediction about reaction rate is best supported by collision theory?