Select the correct answer.

if two half-lives have passed since a scientist collected a 1.00-gram sample of u-235, how much u-235 is left now?

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 are the two largest greenhouse gases

An atom that gains or loses one or more electrons is called a(n)