What effect does an opaque object have on light. explain

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]

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3