When a piece of copper metal is heated in air, it joins together with oxygen in the air (a chemical reaction). then if the copper is weighed, it is found to have a greater mass than the original piece of metal. if the air was then measured with very specialized instruments, what can you expect the mass of the air to be? a. the same as before the chemical reaction b. more than before the chemical reaction c. twice as much as before the chemical reaction d. less than before the chemical reaction

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.