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.
why do ionic compounds dissolve in water? because water (H2O) is polar, (oxygen is neg, hydrogens are pos) the ionic compound's cations and anions break apart and bond to the opposite water charge why do ionic compounds conduct electricity? when cations and anions dissolve or melt, they move around bringing charge with them. at the metal ends of the wires (which conduct electricity too), chemical reactions allow electrons to enter and leave the water.