Fermentation makes ethanol
Fermentation makes ethanol

Fermentation is the conversion of sugars into ethanol and carbon dioxide by enzymes in yeast. Yeast is added to an aqueous carbohydrate solution, because the enzymes work in water.
Step-by-step lessons on Edexcel GCSE Chemistry 10.4.4 Fermentation and fractional distillation of ethanol. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.