 If I don't, then we won't. Anyways, OK. So the problem we're doing asks, or says, the property of a mixtures are typically averages of the properties of its components. The properties of a compound may differ dramatically from the properties of the elements that combine to produce the compound. For each process described, state whether the material being discussed is most likely a mixture or a compound, and state whether the process is a chemical change or a physical change. OK, so the first material being discussed is an orange liquid distilled, resulting in the collection of a yellow liquid and a red solid. So orange liquid, that's intermediate in physical properties between a yellow liquid and a red solid. OK, so you could assume that that's a mixture. Not only that, distillation is a way to physically separate things, and you can't physically separate something that's a compound. So that wouldn't be a chemical change. It's a physical change. OK, so it's clearly a mixture. A colorless crystalline, the next one says a colorless crystalline solid is decomposed, yielding a pale green soft gas, and a soft, shiny metal. OK, well, yellow green gas and soft, shiny metal is not anywhere in between or on either side of a colorless crystalline solid. OK, so in fact, what you're doing here is you're decomposing sodium chloride to make chlorine gas and sodium metal. And that's clearly a chemical process. OK, again, the physical properties of these three substances aren't anywhere near each other. And the last one, a cup of tea becomes sweeter as sugar is added to it. Well, tea by itself and sugar by itself tastes like the components of sweet tea, right? So you would expect that to be a mixture. You could also imagine, basically, separating sugar and tea by, I don't know, by evaporating the water. And then you could, I don't know, selectively melt some of the sugar. Or I guess you could just filter out the sugar. Or you could wash it out from the tea mixture. So that would be a physical separation. All right, that's a physical combination. But that's clearly a mixture, too.