What happens to the potential energy of the molecules in a reaction? A. The potential energy of the molecules changes during a reaction.
B. The reactants only lose potential energy when forming products.
C. The potential energy of the molecules does not change in a
reaction
D. The potential energy of the products is equal to that of the
reactants.

its

The potential energy of the molecules change during a reaction  

Explanation:

During an exothermic reaction, bonds break and new bonds form and, protons and electrons go from a structure of higher potential energy to lower potential energy. Also, energy is converted to kinetic energy, which is the heat released in reactions.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds