When you convert feet to inches, how do you decide which portion of the conversion factor should be in the numerator and which in the denominator?

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false