This question is about the element calcium and some of its compounds. A sample of solid anhydrous calcium nitrate, $$\(\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s})\)$$, is heated strongly for several minutes in the apparatus shown. (i) State two observations that would be made. (2) ........................................................................................................................................................................................................................................................................... .. ................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................... .. (ii) Explain why the observations from (c)(i) would be made more quickly if the experiment was repeated with solid anhydrous magnesium nitrate, $$\(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s})\)$$. (3)

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