Various masses of the three Group 2 A elements magnesium, calcium, and strontium were allowed to react with liquid bromine, ${\mathrm{Br}}_2$. After the reaction was complete, the reaction product was freed of excess reactant(s) and weighed. In each case, the mass of product was plotted against the mass of metal used in the reaction (as shown below).(a) Based on your knowledge of the reactions of metals with halogens, what product is predicted for each reaction? What are the name and formula for the reaction product in each case?(b) Write a balanced equation for the reaction occurring in each case.(c) What kind of reaction occurs between the metals and bromine $-$ that is, is the reaction a gas-forming reaction, a precipitation reaction, or an oxidation-reduction reaction?(d) Each plot shows that the mass of product increases with increasing mass of metal used, but the plot levels out at some point. Use these plots to verify your prediction of the formula of each product, and explain why the plots become level at different masses of metal and different masses of product.

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