I need somebody who is good at high school chemistry in like 20 minutes. I need help with empirical formulas, molecular formulas and stuff like that

How do scientists think that gravity affected the formation of our solar system?

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring