a) Name the gas produced. (1mk) Step 1: Identify the process occurring. Active yeast cells in a sugar solution undergo anaerobic respiration (fermentation) in a warm environment. Step 2: Name the product gas. The gas produced during anaerobic respiration by yeast is carbon dioxide. The gas produced is carbon dioxide. b) Write an equation to represent the chemical reaction above. (1mk) Step 1: Recall the reactants and products of anaerobic respiration in yeast. Glucose is broken down into ethanol and carbon dioxide. Step 2: Write the balanced chemical equation. $$\text{C}_6\text{H}_{12}\text{O}_6\text{(aq)} \rightarrow 2\text{C}_2\text{H}_5\text{OH(aq)} + 2\text{CO}_2\text{(g)}$$ 3 done, 2 left today. You're making progress.