 Okay, ladies, so let's do this problem. It says State whether each of the following is a physical or chemical property. Okay, so we go with this one Should we do this one? Okay, so the A says manganese bubbles and acid. Is that going to be a physical or chemical? chemical, why is that? Because whenever you see bubbles, that's an indication of what? Chemical change or reaction. Okay, so what are we going to say over here? Silver is malleable. What is that? Physical, because what does malleable mean? When you can hit it right with a hammer and it does what? Flans out, very good. Yes, very good. Okay, so silver is malleable. What is that? Physical. Okay, wonderful. Okay, what about the next one? Calcium turns dark in air. Chemical, why do you say that? It's a permanent change in color. Okay, so whenever you see that that's always going to be a chemical change, okay? So hopefully what you're doing is looking at the notes and you found that page where I've written down all of the indications of finding a chemical change. Whenever you, so you're going to have to memorize that list or it'd be good for you to memorize that list. So whenever those things happen, you can always just put chemical and everything else is going to be physical, okay? So what about this one? Carbon grinds to a powder. That's physical. Physical, why? Because you're just physically grinding. It's not reacting with any of this. Okay, any questions on this one, ladies? No. Okay, wonderful. You did very good.