devozeeba

In the flow diagram below, I and II represent industrial processes used in the fertiliser industry. P and Q are chemical reactions that take place to produce ammonium sulphate and fertiliser Y respectively. 10.1 Write down the name of the industrial process: 10.1.1 I (1) 10.1.2 II (1) 10.2 Write down the NAME or FORMULA … Read more

8.1 Corrosion is a redox reaction that takes place in the presence of oxygen and water. Rusting is the corrosion of iron leading to the formation of iron(III) ions. 8.1.1 Define oxidation in terms of electron transfer. (2) A cleaned copper rod and a cleaned iron nail are placed in a beaker containing water at … Read more

7.1 Sulphuric acid is a strong acid present in acid rain. It ionises in two steps as follows: 7.1.1 Define an acid in terms of the Lowry-Brønsted theory. (2) 7.1.2 Write down the FORMULA of the conjugate base of H3O+(aq). (1) 7.1.3 Write down the FORMULA of the substance that acts as an ampholyte in … Read more

Dinitrogen tetraoxide, N2O4(g), decomposes to nitrogen dioxide, NO2(g), in a sealed syringe of volume 2 dm3. The mixture reaches equilibrium at 325 °C according to the following balanced equation: When equilibrium is reached, it is observed that the colour of the gas in the syringe is brown. 6.1 State Le Chatelier’s principle. (2) 6.2 The … Read more