Final answer:
Sam is likely incorrect because the maximum quantities and purity of the products depend on complete reaction and absence of impurities. Copper sulphate and water are the expected products after the fizzing of carbon dioxide gas stops when sulphuric acid reacts with copper carbonate.
Step-by-step explanation:
When Sam adds sulphuric acid to copper carbonate, he is performing a chemical reaction that yields copper sulphate, water, and carbon dioxide gas. The fizzing that Sam observes is due to the release of carbon dioxide gas (CO2). If we assume that he has added enough sulphuric acid to react with all the copper carbonate, then the two pure products he refers to in the beaker would likely be copper sulphate and water, since the carbon dioxide gas would escape as a fizz. However, if not all of the copper carbonate reacted, he would not get the maximum quantities of the two products. Moreover, the purity of the products would depend on whether any impurities were present in the chemicals or the beaker, and if the reaction was complete.
When conducting chemical reaction experiments, as demonstrated in other reactions mentioned, it's important to record observations and balance chemical equations to understand the stoichiometry and outcome of the reactions properly. Copper sulfate, for example, loses water of crystallization upon heating, which changes its appearance from blue to white. The experiments with sodium carbonate and sodium sulphate solutions with copper(II) chloride further illustrate the different outcomes of reactions in qualitative terms.