What does the pudding represent in the plum pudding model of the atom?

What is the formula for calcium iodide

100mg magnesium reacts with 20ml of 1.0m hcl

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d