Which of the following is an effect of the electric force? A. Two negative charges are attracted to one another.

B. Two south poles are attracted to one another.

C. Two north poles repel each other.

D. Two positive charges repel each other.

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

Ineed with my science work! it’s due tomorrow!

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury