5. Write correct formulae for the following: (2 marks each)
a) sodium chloride
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b) calcium bromide
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c) aluminum sulfide
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d) magnesium sulfate
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e) phosphoric acid
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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
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b) KClO3 ? KCl + O2
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(6 pts) 8. Write balanced equations for the following: (3 marks each)
a) sodium + chlorine gas (Cl2) ? sodium chloride
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b) nitric acid + calcium hydroxide ? calcium nitrate + water
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