Skills for Study Level 2 Teacher's Book - Cambridge University Press

4b See 4c for answers.4cAnswers3.5StepPosition in sequencea Add 0.1 ml of acetyl chloride 4b Leave the mixture sitting in cold water for15 minutesc Place 140 mg of salicylic acid in a test tube 1d Add 0.1 ml of pyridine 3e Place the tube in a beaker of cold water and place it inthe fume hood524dAnswers1 Probably didn’t wear gloves as instructed, and the salicylic acid or pyridineirritated their skin.2 The instructor clearly said that pyridine smells bad and should be used only inthe fume hood, therefore the student probably didn’t use it in the fume hood.4eAnswers1 Büchner flask(Also known as a vacuum flask): a glass with a nozzle for attaching a pipe2 Büchner funnelA funnel with a perforated plate at the bottom, used in experiments involving suction3 rubber tubeThick, flexible rubber pipe used in science labs4 test tube (see 4a)5 aspiratorA device which uses flowing water to create a vacuum.BüchnerfunnelRubbertubeTapAspiratorBüchnerflaskUnit 3 Part A ∙ Understanding spoken information 78