An irregularly-shaped sample of aluminum (Al) is put on a balance and found to have a mass of 65.5 g. The student decides to use the water-displacement method to find the volume. The initial volume reading is 50.6 mL and, after the Al sample is added, the water level has risen to 68.5 mL. a. Based on the problem above, write the known and the unknown quantities, respectively. b. What is the volume of aluminum (Al)?c. Find the density of the Al sample in g/cm3.

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.