AQA GCSE Chemistry Paper 2 Exam Questions with Complete Solutions 2024/2025

▪ How would you describe the pH of carbon dioxide - Ans .slightly acidic ▪ Why is it bad for plastic bags to be burned - Ans .Release toxic gases that are bad for human health and release greenhouse gases that harm the environment ▪ If talking about bromine water etc, what is the term used when the liquid has no colour - Ans .colourless (NOT CLEAR) ▪ What are the particles involved in ionic bonding - Ans .Ions ▪ What would sodium hydroxide not do in water and what is the word equation for the reaction of a base with water - Ans .Fizz. ▪ Acid+BaseSalt+Water ▪ Why might you add acid to water before electrolysing it - Ans .To increase its conductivity ▪ In the electrolysation of water, why is the total amount of oxygen collected always slightly less than expected - Ans .Some of the oxygen dissolves in the water ▪ What is the colour of copper carbonate - Ans .Green ▪ Bromine at room temperature is - Ans .A red brown liquid ▪ What is redox - Ans .a reaction where both reduction and oxidation occurs ▪ What is the catalyst used in the production of ethanol from glucose - Ans .Yeast ▪ What is the temperature, pressure and catalyst needed in the production of ethanol from ethene - Ans .Temp 250-350. Pressure 60 at. Catalyst Phosphoric acid ▪ Why might someone use fermentation to produce ethanol - Ans .Sugar Caine available, renewable crop ▪ What sort of reaction is turning ethanol into ethene and what is the catalyst - Ans .Dehydration, aluminium oxide ▪ What happens to the ions in a ionic compound when molten - Ans .They become mobile (and can conduct electricity) ▪ What colour does copper (2) goes after adding NaOH - Ans .Blue ▪ To test for sulphate ions what should you do - Ans .Add HCl then BaCl2 and look for a white precip ▪ Why is it necessary to add HCl before BaCl - Ans .to remove carbonate ions ▪ What is the catalyst and term used for cracking long chain hydrocarbons - Ans .Silica, 600-700 ▪ What kind of reactions occur in cracking - Ans .Decomposition ▪ When a metal reacts with an acid, what gas is produced? What else is produced - Ans .Salt+Hydrogen ▪ What is produced when an acid reacts with a metal carbonate - Ans .Salt+water+carbon dioxide ▪ What is produced when an acid reacts with a metal oxide - Ans .Salt+water ▪ How is heat supplied in a thermite reaction to join railways - Ans .Burning of magnesium ▪ What sort of reaction is glucose ethanol - Ans