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Ionic bonding

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Question 11

Sodium chloride, NaCl\text{NaCl}NaCl, and calcium oxide, CaO\text{CaO}CaO, are ionic compounds.

a.

Calculate the relative formula mass (MrM_{\text{r}}Mr​) of CaO\text{CaO}CaO. (Take Ar: Ca=40A_{\text{r}}\text{: Ca} = 40Ar​: Ca=40, O=16\text{O} = 16O=16)

[1]
b.

Give the chemical formulae of the two ions present in NaCl\text{NaCl}NaCl.

[1]
c.

Explain why:

  • ionic compounds have high melting points
  • the melting point of calcium oxide is much higher than the melting point of sodium chloride
[4]
d.

Explain, in terms of structure and bonding, why ionic compounds do not conduct electricity when solid, but do conduct electricity when molten or in aqueous solution.

[2]

Ionic bonding Questions

  1. IGCSE
  2. /Chemistry
  3. /Ionic bonding