if i have 340ml of 0.5M NaBr solution, what will the concentration be if i add 560mL more water to it?

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Name the intersection of plane bpq and plane cpq.

Element before carbon on the periodic table