Help !! 1. What are the two categories of energy a substance can possess: _ & _
2. Define (in your own words) potential energy (PE) and kinetic energy (KE):

a. Potential energy:

b. Kinetic energy:

3. Briefly describe how the KE and PE change as a child
swings on a swing:

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.