Vinegar Vinegar is a solution of organic acid (ethanoic acid, CH3COOH). Vinegar is widely used for several domestic purposes including the removal of ‘fur’ or ‘lime’ from kettles. A housewife found that when she cleaned her kettle with a brand of vinegar called ‘VineGo’, it took 12 hours for the ‘fur’ to be completely removed. However, when she used a brand called ‘Sparkling White’, is took only 2 hours to remove the same amount of fur.

Propose a hypothesis to explain this observation.
Plan and design an experiment to test your hypothesis.

Compare and contrast physical changes with chemical changes.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.