Edexcel IGCSEChemistryGeneral Applications5 Marks
Magnesium reacts with dilute hydrochloric acid to produce magnesium chloride and hydrogen gas.
- (a)Write a balanced symbol equation for this reaction, including state symbols.[2]
- (b)A student reacted 0.12 g of magnesium (Ar = 24) with excess dilute hydrochloric acid.[3]
- (b)(i)Calculate the number of moles of magnesium used.[1]
- (b)(ii)Calculate the maximum mass of magnesium chloride (Mr = 95) that can be formed.[2]
Mark scheme
Marking points from the official mark scheme. The mark or mark type is shown in brackets.
- M3(a) M1 for correct formulae: Mg + HCl → MgCl2 + H2
- A1 for balanced equation with correct state symbols: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
- M3(b)(i) B1 for 0.005 (mol)
- M3(b)(ii) M1 for (0.005 × 95)
- A1 for 0.475 (g)
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →