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

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Question 24

A reaction is represented by the unbalanced symbol equation:

Mg(NO3)2+NaOH→Mg(OH)2+NaNO3\text{Mg(NO}_3\text{)}_2 + \text{NaOH} \rightarrow \text{Mg(OH)}_2 + \text{NaNO}_3Mg(NO3​)2​+NaOH→Mg(OH)2​+NaNO3​

Which version of the symbol equation has the same number of atoms of each element on both sides?

[1]
A

Mg(NO3)2+2NaOH→Mg(OH)2+2NaNO3\text{Mg(NO}_3\text{)}_2 + 2\text{NaOH} \rightarrow \text{Mg(OH)}_2 + 2\text{NaNO}_3Mg(NO3​)2​+2NaOH→Mg(OH)2​+2NaNO3​

B

Mg(NO3)2+3NaOH→Mg(OH)2+3NaNO3\text{Mg(NO}_3\text{)}_2 + 3\text{NaOH} \rightarrow \text{Mg(OH)}_2 + 3\text{NaNO}_3Mg(NO3​)2​+3NaOH→Mg(OH)2​+3NaNO3​

C

2Mg(NO3)2+2NaOH→2Mg(OH)2+2NaNO32\text{Mg(NO}_3\text{)}_2 + 2\text{NaOH} \rightarrow 2\text{Mg(OH)}_2 + 2\text{NaNO}_32Mg(NO3​)2​+2NaOH→2Mg(OH)2​+2NaNO3​

D

Mg(NO3)2+NaOH→Mg(OH)2+2NaNO3\text{Mg(NO}_3\text{)}_2 + \text{NaOH} \rightarrow \text{Mg(OH)}_2 + 2\text{NaNO}_3Mg(NO3​)2​+NaOH→Mg(OH)2​+2NaNO3​

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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