Chemistry 5070 · O Level · Identification of ions and gases
Identification of ions and gases — practice question
A student puts a known mass of magnesium ribbon into $100\,\text{cm}^3$ of dilute hydrochloric acid, which is in excess, in the apparatus illustrated. Hydrogen gas is produced.
(a(i))[1]
Give a test and an observation that identify hydrogen gas.
(a(ii))[2]
Name the apparatus labelled A and B.
(a(iii))[1]
What volume of hydrogen is gathered in B?
(b(i))[2]
Which apparatus, X, Y, or Z, should be used? Explain why.
(b(ii))[1]
Explain why the student would be unable to obtain a dry sample of the gas using the apparatus shown below.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Produces a pop in a flame / lighted splint produces a pop / burning splint produces a pop” …