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1.1 Formulae, equations and hazards

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Question 7
H

Ammonia burns in pure oxygen. The balanced equation is:

4NH3+3O2→2N2+6H2O4\mathrm{NH_{3}} + 3\mathrm{O_{2}} \rightarrow 2\mathrm{N_{2}} + 6\mathrm{H_{2}O}4NH3​+3O2​→2N2​+6H2​O

Statement 1: the equation shows 4 molecules of ammonia reacting with 6 atoms of oxygen

Statement 2: the total number of molecules is the same on both sides of the equation

Statement 3: the total mass of the products is equal to the total mass of the reactants

Which statements are correct?

[1]
A

1 and 3 only

B

1 only

C

2 and 3 only

D

1, 2 and 3

Markscheme

1.1 Formulae, equations and hazards Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 Formulae, equations and hazards

47 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.

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