(a) Describe the difference between the following pairs of terms. Use examples in your answer. (i) A covalent v

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(a) Describe the difference
between the following pairs of terms. Use examples in your
answer.
(i) A covalent
versus an ionic bond
(ii) A
s1s molecular orbital versus a
s*1s molecular
orbital
(iii) Formal charge versus
effective charge
(iv) Crystal lattice versus unit
cell
(b) What are the correct
formulae for the following compounds?
(i)
sodium sulphate
(ii) copper(II) perchlorate
hexahydrate
(iii)
dinitrogen monoxide
What are the correct names of the following compounds?
(iv)
H2SO4
(v)
IF6
(vi)
Na2CO3
(c) A magnesium hydroxide
solution (containing 3.0 g Mg(OH)2) when reacted
with 0.150 M phosphoric acid forms insoluble magnesium phosphate
according to the equation:
3Mg(OH)2(aq) + 2H3PO4(aq)
→ Mg3(PO4)2(s) +
x H2O
(iii) How many moles of phosphoric
acid are needed to neutralise all of the Mg(OH)2?
(iv) What volume of 0.150 M phosphoric
acid would be needed to neutralise the magnesium hydroxide
solution?
(v) What mass of magnesium phosphate
would be produced from 10.0 g Mg(OH)2?