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.
Ionic salts conduct electricity when their ions are free to move towards oppositely-charged electrodes. Solid ionic compounds do not conduct electricity because the ions cannot move: they can only vibrate around fixed positions in a rigid, three-dimensional structure.ead(II) bromide is an electrolyte because it can conduct electricity when molten and when it is dissolved in water (in aqueous solution) but not when it is solid. Metals differ from electrolytes because they conduct electricity when they are solid as well as when they are molten.