Describe the difference between a mixture and a compound. Suppose that you have a pure substance. How can you tell whether it is a compound or an element?
1.What is the difference between an ionic and a covalent bond?
2.Explain why ionic compounds are formed when a metal from the left side of the periodic table reacts with a nonmetal from the right side. Give two examples of such compounds.
3.Explain why covalent bonds are formed when nonmetals from the right side of the periodic table bond with each other. Give two examples of such compounds.