2 a) Describe in detail the preparation of a pure, dry sample of copper(II) sulfate crystals, CuSO,5H,0, starting from
copper(ll) oxide.

b) Write full equations for (i) the reaction producing
copper(II) sulfate solution, (ii) the crystallisation reaction.

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Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Explain why scientists use shared characteristics to make cladograms.

During which time interval does the object travel approximately 10 meters