What happens to chemical bonds between atoms or ions during a chemical reaction?

What is the molecular weight of copper

What is the work done by the electric force to move a 1 c charge from a to b?

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground,its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy