1. Show the class pictures of five very different mammals, such as a cat, kangaroo, horse, rabbit, and monkey. Explain that all these animals are mammals, and that mammals constitute one class of the animal kingdom, which also includes other classes, such as reptiles, birds, and fish. Ask students what these five mammals have in common and mark their responses on a sheet of chart paper.
When ionic compounds are in a molten state or dissolved in water, forming an aqueous solution, the ions that formed the ionic compounds are able to move around freely, thus able to conduct electricity.
The structure of water makes it a polar molecule. This shows each hydrogen atom contain a slight positive charge, while the oxygen contain a slight negative charge. Ionic compounds are crystalline in nature that contain the same number of both positive and negative ions. When you dissolve these ionic compounds in water, its molecules begin to attract water ions, which causes a separation between the ionic molecules. These atoms of hydrogen contained in water molecules are nearest to the ions of the compound with a negative charge, while the atoms of oxygen in the water molecule is nearest to the ions of ionic compounds with a positive charge.