The Octet Rule is important because A atoms always end up with eight electrons in their outermost energy level. B elements want to be a noble gas
C They have filled p sublevels.
D All of the above

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %