EasyChemistryHigh School (9–10)GeneralAtoms and Molecules › Molecules, Ions and FormulaeConceptualBoard Exam

Name each of these compounds. KCl; CaO; Na₂CO₃; Mg(NO₃)₂; (NH₄)₂SO₄; Al(OH)₃

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Name each of these compounds.

$\text{KCl}$
$\text{CaO}$
$\text{Na}_2\text{CO}_3$
$\text{Mg(NO}_3)_2$
$(\text{NH}_4)_2\text{SO}_4$
$\text{Al(OH)}_3$

Need a reminder? The key ideaShow

Valency is the combining capacity of an atom or group. Criss-cross: write the symbols and valencies, cross the valencies over, simplify, and put a group in a bracket if there is more than one of it. Names: the metal first, then the non-metal ending in ide, or the group's name.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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← A tiny crystal of magnesium chloride, MgCl₂, has 350 ions of Mg²⁺…Write the formula of calcium phosphate. Calcium has a valency of 2, and the phosphate group, PO₄… →

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Name each of these compounds. KCl; CaO; Na₂CO₃; Mg(NO₃)₂; (NH₄)₂SO₄; Al(OH)₃

The worked solution

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