AQA GCSE Chemistry Paper 1 Questions & answers

What is a mixture? - CORRECT ANSWER-Two or more elements not chemically bonded What is the difference between a compound and a mixture? - CORRECT ANSWER-Compounds have a fixed composition whereas mixtures do not. Mixtures are not chemically bonded but compounds are. Describe the process of filtration - CORRECT ANSWER-Pour the mixture onto the filter paper, the liquid simply passes through the filter paper into the flask. The insoluble solid cannot pass through and so it stays on the paper Describe the process of crystallisation - CORRECT ANSWER-Use the method of filtration to filter off any excess soluble solid. Evaporate the mixture then transfer the hot mixture onto a dish. Crystals are formed when the mixture has cooled Describe the process of simple distillation - CORRECT ANSWER-Firstly evaporate the mixture by heating it, the dissolved solid then vaporises. These vapours condense in the condenser, the dissolved solid then flows into the beaker and li