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.
Not all of them do. Water is a highly polar solvent. Water molecules can interact strongly with ions, forming a shell around them that also screens the ions from each other. An ionic compound will dissolve readily if the interaction energy between the ions and water is energetically (what physicists call the free energy) favorable compared to the solid salt. 1.5k Views Â· View Upvoters