On désire préparer une solution de sulfate de cuivre de concentration 20 g/L. Si on pèse 1g de sulfate de cuivre solide, il faudra les introduire dans une fiole jaugée de:

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

2. what two items do autotrophs take from the environment to produce their food? 3. what are the two items that are released during transpiration from leaves? 4. what are the two membranes of the system? a.what are the two stages of photosynthesis? what are the two parts of photosynthesis?