A ball is rolling up and over a hill. The ball slows down as it moves from Position 1 to Position 3. and it speeds up as it moves from Position 3 to Position 5. When is the gravitational potential energy of the ball being transformed into motion energy (kinetic energy)?

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.