What condition must occur when a chemical reaction is at equilibrium? select one:
-the products and reactants are present in equal concentrations.
-the forward and reverse reactions are happening at equal rates.
-neither condition must occur when a chemical reaction is at equilibrium.
-both conditions must occur when a chemical reaction is at equilibrium.

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.

Mercury turns to a vapor at 629.88 k. how much heat is lost when 75.0 g of mercury vapor at 650 k condenses to a liquid at 297 k?

How many moles are in 7.2 x 10^23 carbon molecules?