Edexcel GCSE Chemistry Topic 3 REVISION (Chemical changes)

This is an engaging revision lesson which uses a range of exam questions, understanding checks, quick tasks and quiz competitions to enable students to assess their understanding of the content within topic 3 (Chemical changes) of the Edexcel GCSE Chemistry specification.

The specification points that are covered in this revision lesson include:

• Recall that acids in solution are sources of hydrogen ions and alkalis in solution are sources of hydroxide ions
• Recall that the higher the concentration of hydrogen ions in an acidic solution, the lower the pH; and the higher the concentration of hydroxide ions in an alkaline solution, the higher the pH
• Recall that as hydrogen ion concentration in a solution increases by a factor of 10, the pH of the solution decreases by 1
• Recall that a base is any substance that reacts with an acid to form a salt and water only
• Recall that alkalis are soluble bases
• Explain the general reactions of aqueous solutions of acids with metals, metal oxides, metal hydroxides and metal carbonates to produce salts
• Describe the chemical test for hydrogen and carbon dioxide
• Describe a neutralisation reaction as a reaction between an acid and a base
• Explain an acid-alkali neutralisation as a reaction in which hydrogen ions (H+) from the acid react with hydroxide ions (OH–) from the alkali to form water
• Explain how a soluble salts is prepared from an acid and an insoluble reactant
• Explain how soluble salts are prepared from an acid and a soluble reactant
• Recall that electrolytes are ionic compounds in the molten state or dissolved in water
• Explain the movement of ions during electrolysis
• Explain the formation of the products in electrolysis
• Write half equations for reactions occurring at the anode and cathode in electrolysis
• Explain oxidation and reduction in terms of loss or gain of electrons

The students will thoroughly enjoy the range of activities, which includes quiz competitions like “From NUMBERS 2 LETTERS” where they compete to be the 1st to get the abbreviation Oil Rig whilst crucially being able to recognise the areas of this topic which need their further attention. This lesson can be used as revision resource at the end of the topic or in the lead up to mocks or the actual GCSE exams