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3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

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Question 34

Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen. The unbalanced equation is:

Mg+HCl→MgCl2+H2\text{Mg} + \text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2Mg+HCl→MgCl2​+H2​

Which equation shows this reaction correctly balanced?

[1]
A

Mg+H2Cl2→MgCl2+H2\text{Mg} + \text{H}_2\text{Cl}_2 \rightarrow \text{MgCl}_2 + \text{H}_2Mg+H2​Cl2​→MgCl2​+H2​

B

Mg+2HCl→MgCl2+2H2\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + 2\text{H}_2Mg+2HCl→MgCl2​+2H2​

C

Mg+2HCl→MgCl2+H2\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2Mg+2HCl→MgCl2​+H2​

D

2Mg+2HCl→2MgCl2+H22\text{Mg} + 2\text{HCl} \rightarrow 2\text{MgCl}_2 + \text{H}_22Mg+2HCl→2MgCl2​+H2​

Markscheme

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.

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