4. A sealed glass tube contains 2.25 g of copper and 3.32 g of sul- fur. The mass of the tube and its contents is 18.48 g. Upon heating, a reaction forms copper(II) sulfide (Cus). All of the copper reacts, but only 1.14 g of sulfur reacts, Predict what the mass of the tube and its contents will be after the reaction is completed. Explain your reasoning.​

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.