Super duper urgent halp me pls

what is the name of this molecule?
a compound with a total of four carbons. a straight chain across the bottom of three carbons with all single bonds. there is a methyl group branched off of the middle carbon.

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.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?