This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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You're on a roll — Here are the answers to the questions: 3. a) Write out the procedure used by the student in each of the steps: I: Sodium carbonate is reacted with dilute hydrochloric acid in a conical flask to produce a gas. II: The gas produced is passed through a delivery tube into an intermediate test tube for transfer. III: The gas is then bubbled through lime water (calcium hydroxide solution) in a test tube. IV: The lime water turns milky, indicating the presence of carbon dioxide. b) Give two (2) observations made in the test: 1. Effervescence (bubbling/fizzing) is observed in the conical flask in Step I. 2. The lime water turns milky/cloudy in Step IV. c) Write the conclusion drawn from the test: The gas produced is confirmed to be carbon dioxide. 4. a) Identify each of the symbols labelled A, B, C, D and E: A: Irritant / General Hazard* B: Corrosive* C: Flammable* D: Toxic / Poisonous* E: Environmental Hazard* b) Name two (2) chemicals which can be associated with each symbol A, B, C, D and E: A (Irritant): Ammonia, Bleach (dilute) B (Corrosive): Concentrated hydrochloric acid, Sodium hydroxide C (Flammable): Ethanol, Petrol D (Toxic): Cyanide, Mercury compounds E (Environmental Hazard): Pesticides, Heavy metal compounds c) State two (2) safety precautions that should be taken when handling chemicals with symbol C: 1. Keep the chemical away from open flames, sparks, and heat sources. 2. Ensure adequate ventilation to prevent the accumulation of flammable vapours. Drop the next question 📸