I really need help on this

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Describe the interaction that occurs between two objects with the same electrical charge.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?