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3.1 Introducing chemical reactions

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Question 2

In a demonstration, 2.30 g of sodium is heated in a flask containing 0.0400 mol of chlorine gas.

\mathrm{2Na + Cl_{2} \rightarrow 2NaCl}

The reaction stops when one reactant has been used up.

Which option shows the reactant that is left over and the maximum mass of sodium chloride made?

Relative atomic mass ( $A_r$ ): Na = 23.0 Cl = 35.5

[1]

A

Sodium is left over; 5.85 g

B

Sodium is left over; 2.34 g

C

Sodium is left over; 4.68 g

D

Chlorine is left over; 5.85 g

Markscheme

3.1 Introducing chemical reactions Questions

GCSE
Chemistry
3.1 Introducing chemical reactions

134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

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