A student designed an experiment to measure the temperature change when magnesium ribbon is added to dilute hydrochloric acid. Their experimental plan was as follows:
The student's recorded data is shown below:
Why is it better to use a polystyrene cup rather than a metal beaker for this experiment?
The chemical equation for this reaction is:
Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g) \text{Mg}(s) + 2\text{HCl}(aq) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g) Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)Suggest one observation, other than the change in temperature, that could be made during this reaction.
State whether this reaction is exothermic or endothermic, and justify your response.
Calculate the heat energy change (in Joules) in this experiment using the expression:
heat energy change=volume of solution×4.2×temperature change \text{heat energy change} = \text{volume of solution} \times 4.2 \times \text{temperature change} heat energy change=volume of solution×4.2×temperature change
