Which of these is not considered a pure substance? An atom
A mixture
An element
A compound

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]

1) this is the structure in the cell nucleus that houses a cell's genetic information

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball