In the reaction h2 + n2 > 2 nh3, what coefficient should be placed in front of h2 to balance the reaction? a. 1 b. 2 c. 3 d. no coefficient is needed.

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas