The adjective compound means "made by the combination of two or more parts". in a compound microscope, which are the parts that are being combined, and why?

Different isotopes indicate that an element will have different numbers of

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

We are hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?