Calculate the ph and the poh of an aqueous solution that is 0.030 m in hcl(aq) and 0.065 m in hbr(aq) at 25°c.

Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 77.0 g of gold? explain how you got your answer and the steps you took. you

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?