Question
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
A student reacts 10 g of CaCO₃ with excess HCl in an open beaker. The mass decreases by 4.4 g.
(a) Explain, in terms of atoms, why mass should be conserved in all chemical reactions. (2 marks) (b) Explain why the measured mass decreased. (2 marks) (c) Show that the mass of CO₂ produced from 10 g of CaCO₃ is 4.4 g. [Mr: CaCO₃ = 100, CO₂ = 44] (3 marks)
7 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.