 Okay, so let's try this one and it's just this one like I was saying I just want you to use common sense Okay, that's all it's saying is saying okay. The nickel sulfate is green. Okay, so let's pretend so what we've got here so is Nickel-2 sulfate so we're just so And I so for okay, so that's a nickel-2 sulfate. So that's green so what we've got here is to What do you say overhead projector sheet cutouts of little pretend ions? Okay, that's a nickel sulfate. This one says it's sodium sulfate and this one says it's sodium chloride Okay, so you know that sodium chloride. Oh, okay, so let's read the question I guess it says so nickel sulfate is green sodium sulfate is colorless and sodium chloride is colorless What color would you predict for nickel chloride? Okay, so what you're saying here is okay I know that sodium chloride is composed of these two ions sodium Plus and chlorine or chloride minus. Okay, so If this thing is colorless Then both of those ions must be colorless. Okay, so that's what we have here in a plus ion And a cl minus on okay both colors It also says that sodium sulfate is colorless and we know that sodium is well, so let's write that down colorless So we know already Is sodium without even looking at that is sodium colorless or not? It's colorless, right? So if sodium is colorless and the whole compound is colorless, then sulfate must be what? Colorless, too. Okay, so we've got this colorless colorless colorless colorless Nickel sulfate. Okay, so that's composed or nickel to sulfate. We should say that's composed of two ions the nickel to plus ion and the sulfate Ion, what do we know about the sulfate ion already? It's colorless, right? And the whole compound is green, right? So do you think that green color is coming from the sulfate? No, it's actually we've got it here, right? The sulfate is colorless. Okay, it's the nickel to plus that's the green. In fact, what you want to remember is that a lot of these transition metals because they've got unpaired electrons, they absorb light. Okay, and so they make these kind of color, colorful compounds. Remember when we were doing copper sulfate last week? It was blue. Copper compounds are blue because copper's got these unpaired electrons that absorb you know, certain wavelengths of light. Well, anyways, let's finish this problem off, right? So we've got our last compound here and we don't know I guess I shouldn't put that up. It asks us what is the color, right, of nickel to chloride, right? So niCl2. So what is the color of that, right? So we know the Cl minus is what colorless, right? But the niCl2 plus What color did we figure that out to be? Green. So we would expect this compound to be what? Green. Yeah When we put it up Clearly, it's green. Clearly from my cut-out, so these things. So does that help you out? So like you could do these kinds of things maybe if you had yellow and blue or something like that, and then that would make green. So it's just this kind of So if you have two and one has color and one is colorless, the one with color will always dawn. That's the one that you're gonna see because the other one you don't see because it doesn't absorb light. Yeah, so things like this, I don't have compounds that absorb light. You usually have a transition metal and it's the transition metal that's usually the light absorbing thing. Okay, I can't really think of too many of that. But usually it's that. Okay, some of them will have like these weird, you know, anions that have a lot of pie bonds, you know, and like another transition metal compound that you know, it's like hemoglobin, right? It's red, you know So it's like that iron that we made, the iron compound Iron thiocyanate, you know what I'm saying? And it was that red color, you know So all of these, a lot, not all I shouldn't say, but a lot of these transition metals have potassium permanganate as purple I don't know if you remember we use that stuff, that copper-2 sulfate and to hydrate that we dehydrated last week, you know, that was blue, you know, so Anyways, are we cool? Are there any questions?