5. Write correct formulae for the following: (2 marks each) a) sodium chloride _____________________________________________________________________ b) calcium bromide _____________________________________________________________________ c) aluminum sulfide _____________________________________________________________________ d) magnesium sulfate _____________________________________________________________________ e) phosphoric acid _____________________________________________________________________ 6. Using the electron dot formulae (Lewis structures) with only the valence electrons, show the bonding in: (2 marks each) a) beryllium chloride b) ammonia (NH3) c) methylene chloride (CH2Cl2) d) calcium chloride e) acetylene (C2H2) (4 pts) 7. Balance the following chemical equations: (2 marks each) a) K2CO3 + HNO3 ? KNO3 + CO2 + H2O _____________________________________________________________________ b) KClO3 ? KCl + O2 _____________________________________________________________________ (6 pts) 8. Write balanced equations for the following: (3 marks each) a) sodium + chlorine gas (Cl2) ? sodium chloride _____________________________________________________________________ b) nitric acid + calcium hydroxide ? calcium nitrate + water _____________________________________________________________________
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