Define and discuss a number of physical properties. Define what characterizes a physical property from a chemical property. Discuss what differentiates table salt from softener salt and rock salt, physically and not chemically. Elicit that the particle size is the physical property. Discuss the property of solubility being equal in all three types of salt, as 35.9 g/100 ml of water at standard temperature and pressure. Elicit that the solubility is the same but the rate of solution is different depending on the particle size. Question why the taste would be the same. Define and review density and the density formula.