(a)[4]
Describe what happens when excess dilute hydrochloric acid reacts with magnesium and with magnesium carbonate. Name the products and give any observations.
(b(i))[1]
Fill in the table by giving the size of the magnesium pieces in the first column.
(b(ii))[1]
Describe how lowering the concentration of hydrochloric acid affects the time taken for small pieces of magnesium to react.
(c(i))[2]
State the colour change seen when excess aqueous sodium hydroxide is added to methyl orange in an acidic solution.
(c(ii))[1]
State the pH value of an alkali.
(d(i))[2]
Complete the missing steps 4 and 6 in the method for preparing pure dry crystals of magnesium chloride.
(d(ii))[1]
State why a catalyst is used.