Is adding zinc to hydrogen chloride a chemical or physical change

The first element on the periodic table of elements is carbon. a. true b. false

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction