In the following drawings, red and blue spheres represent atoms of different elements. Match the molecular pictures (a)–(c) with the following descriptions: (i) a pure substance consisting of a compound (ii) a pure substance consisting of an element (iii) a mixture of element

Video transcript

Hey there. Welcome back. Alright. So which of the following is not shown in the figure. Alright. So what we have here, first of all, let's talk about what we have here. So it looks like we have some sort of a chemical reaction. How do we know that? Well, we know that because we have we're starting with you know these two ah you know, molecules and then these two molecules notice how they have orange and orange together and blue and blue together. So it kind of looks like we have two different di atomic elements. So there um you know di atomic elements made up of two of the same elements bonded together. And then what we have here is an era and we actually make a different compound. So we still have these two orange ones bonded together, but we have made a different compound. So anytime we're breaking and making bonds that is going to be a chemical reaction. So because we're looking for something that is not shown here, D is not going to be the answer because this is in fact a chemical reaction in here. Alright, so let's go to number 4281 mixture and one pure substance. Alright, so a mixture is going to be a mixture of doesn't matter. It can be a mixture of different elements, a mixture of different compounds and what it looks like we have in this first image is a mixture And then also a mixture in the 2nd 1. Right? So both of these are mixtures but we actually do not have a pure substance. If we only had for example on one side only had the oranges like this or only have the blues together then that would be a pure substance. But we don't have anything pure and both of these, you know both of these mixtures or containers, whatever you want to call them. We have two different substances here. Right? So that is actually going to be our answer because we were looking for what's not shown and this is not shown. Oops, excuse me. Alright, so this is not shown. That is going to be our answer. Let's take a look at option B2 elements and a compound. Do we have two elements on the compound? Well in fact we do have two elements. We have to die atomic elements. So the blue bonded together is one di atomic element and then the oranges bonded together is another di atomic element. But there's still elements and then the compound So compound is going to be made up of two or more different types of elements bonded together. And what we have here is on the right side. We've made this compound. So yes we do in fact have two different elements and a compound. So that is also not going to be the answer. And then seven molecules. Let's just go ahead and count all of the molecules that we have here. So we have 123456 and seven. So there are seven molecules in this image. So that's not the answer. So the only thing that we don't have here is a pure substance. Okay, we do have some mixtures, but we do not have any pure substances. So answer here will be the right answer. Thanks so much for watching.