(a(i))[1]
a compound that turns from white to blue when water is added
(a(ii))[1]
a compound that is used in the manufacture of cement
(a(iii))[1]
an element that makes up 78% of clean, dry air
(a(iv))[1]
a compound that contains an ion with a single positive charge
(a(v))[1]
a compound that dissolves in water to make an alkaline solution
(b)[2]
Complete the dot-and-cross diagram to show how electrons are arranged in one molecule of ammonia.
(c)[1]
State whether magnesium oxide is a basic oxide or an acidic oxide. Explain your answer.