Edexcel IGCSE Chemistry - Paper 2 Questions and Answers for Final Exam Preparation 2024/2025

▪ High - Ans .Giant ionic structures melting point/ boiling point ▪ Closely packed lattice arranged by the attraction between oppositely charged ions - Ans .Giant ionic structures structure ▪ The electrostatic attraction between oppositely charged ions is very strong so requires a lot of energy to overcome - Ans .Why do giant ionic structures have high mps/bps? ▪ The stronger the forces of attraction - Ans .The higher the charges of the ions in a giant ionic structure ... ▪ 4 - Ans .How many other atoms is a carbon atom covalently bonded to in diamond? ▪ Due to its very rigid giant covalent structure - Ans .Why is diamond the hardest natural substance? ▪ Drill tips, cutting tools - Ans .2 uses of diamond ▪ 3 - Ans .How many other atoms is a carbon atom covalently bonded to in graphite? ▪ Lubricant, it has layers which can slide over each other - Ans .Use of graphite + why it can be used for that ▪ It has free electrons - Ans .Why is graphite the only non-metal that is a good conductor of electricity? ▪ Volume/24 - Ans .Moles of a gas = ▪ 24dm cubed (at room temperature and pressure) - Ans .1 mole of gas always occupies... ▪ Find mr for every element, divide by one of the mrs then times by the mass, use the formula - Ans .How to find the volume of a substance when you know its mass ▪ Mass/Mr x 24 - Ans .Volume = ▪ Hydrogen - Ans .What will be produced at the cathode if the metal ions are more reactive than hydrogen? ▪ A solid layer of the metal - Ans .What will be produced at the cathode if the metal ions are less reactive than hydrogen? ▪ Halides - Ans .What will be produced at the anode if halide ions are present?