Please help me it’s due today at 6:00pm will mark the brainiest and more points please help me

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?