Ammonium chloride is a white crystalline salt. When heated in a test tube, it decomposes into two gases, ammonia and hydrogen chloride. When these gases cool down near the mouth of the tube, they react together to reform the solid ammonium chloride.
Write a word equation for this reversible reaction, including the correct symbol to show that the reaction can go in both directions.
30 exam-style questions on Edexcel GCSE Chemistry 6.3 Dynamic equilibria, covering 6.3.1 The Haber process as a reversible reaction, 6.3.2 Conditions and rate in industrial equilibria, and 6.3.3 Fertilisers and the preparation of ammonium sulfate. Each one has a worked solution and a mark scheme showing where the marks go.