Reversible reactions in a sealed container
3 marks · EasyWhen heating ammonium chloride in a sealed test tube, a reversible reaction takes place.
Write a chemical equation to show the decomposition of ammonium chloride on heating.
State the names of the products formed during the decomposition.
Give a reason why the reaction is reversible.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) NH4Cl(s) ⇌ NH3(g) + HCl(g) · must show correct chemical equation
(b) Ammonia and hydrogen chloride · must show NH3 and HCl names
(c) The products can react to form ammonium chloride again. · must show products reform reactant
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correct chemical equation: NH4Cl(s) ⇌ NH3(g) + HCl(g). Accept use of → or ⇄ arrows.
B1 (b) · 1 mark · Gives both product names: ammonia and hydrogen chloride.
B1 (c) · 1 mark · States that the products can recombine to form ammonium chloride (or similar reason).
Worked solution
a) NH4Cl(s) ⇌ NH3(g) + HCl(g)
b) Ammonia (NH3) and hydrogen chloride (HCl) are produced.
c) The reaction is reversible because the products can react together to form ammonium chloride again.