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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3. a) i) Add dilute hydrochloric acid to sodium carbonate in a conical flask. ii) Pass the gas produced through a delivery tube into a test tube containing lime water. iii) Bubble the gas through lime water (calcium hydroxide solution). iv) Observe the change in the lime water. b) • Effervescence (fizzing) is observed in step I. • The lime water turns milky (cloudy) in step IV. c) The gas produced is carbon dioxide. 4. a) A: Irritant / Harmful / Warning B: Corrosive C: Flammable D: Toxic / Poisonous E: Explosive b) A (Irritant/Harmful): Ethanol, Ammonia solution B (Corrosive): Concentrated hydrochloric acid, Sodium hydroxide C (Flammable): Petrol, Propanone (Acetone) D (Toxic/Poisonous): Potassium cyanide, Mercury compounds E (Explosive): Nitroglycerin, TNT (Trinitrotoluene) c) • Keep the chemical away from open flames, sparks, and other ignition sources. • Ensure the area is well-ventilated or use a fume hood. That's 2 down. 3 left today — send the next one.