In the pennium lab 1/2 life was one shake of the cup. If you stared with 100 pennies and you have 12 pennies left. What 1/2 life is it reasonable at?

0 1/2 life
1st 1/2 life
2nd 1/2 life
3rd 1/2 life

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]

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?