Which of the following accurately describes nuclear reactions?

A. Bonds are broken, and reformed to make a
compound out of the same elements that
you had at the beginning of the reaction.
B. Reactions involve valence electrons
C. Reactions give off huge amounts of energy
D. Atoms are unchanged, but rearranged

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".