Which term refers to elements in rocks combining with oxygen

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

200. ml of 3.00 m nacl solution is diluted to a final volume of 500. ml. what is the molarity of the final solution?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution