On the periodic table how many periods are there and how many columns are there

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

10. translate each of the following chemical equations into a sentence. a. 2 zns(s) + 3 o2(g) -> 2 zno(s) + 2 so2(g) b. cah2(s) + 2 h2o(l) -> ca(oh)2 (aq) + 2 h2(g)

What must happen before a body cell can begin mitotic cell division