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Both types consist of a plastic bag that contains about 100 mL of water plus a dry chemical (40 g of CaCl 2 or 30 g of NH 4 NO 3) in a separate plastic pouch. When the pack is twisted or struck sharply, the inner plastic bag of water ruptures, and the salt dissolves in the water. Use this worksheet to check your students' knowledge and understanding or use it to reinforce teaching and learning about mixtures and separation techniques of pure and impure substances. The worksheet uses a variety of question types including a gap fill exercise and a longer answer question to suit every learner. The worksheet covers chromatography, filtration, evaporation, and distillation ... Will it be a pure substance or a mixture? Give reasons for the same. [NCERT Exemplar] Answer: It is a pure substance because chemical composition of sugar crystals is Which separation technique will you apply to separate the mixture of 'A' and 'B' if the difference in their boiling points is 27°C?