(a(i))[1]
Arrange A, B, C and D in order of reactivity.
(a(ii))[2]
The student wants to slow down the rate of the reaction in the experiment. State two ways to decrease the rate of this reaction.
(b)[1]
In another experiment, a student adds potassium carbonate to dilute hydrochloric acid. State the colour observed in the flame test for potassium ions.
(c(i))[1]
Brass is made from a mixture of two metals. State the name used for a mixture of metals such as brass.
(c(ii))[2]
Name the two metals present in brass.
(c(iii))[1]
Magnalium is a mixture of magnesium and aluminium. Suggest one property of magnalium that makes it more useful than pure magnesium metal.