individual Here are four sketches of pure substances. Each sketch is drawn as if a sample of the substance were under a microscope so powerful that could be seén. atoms Decide whether each sketch shows a sample of an element, a compound, or a mixture O element O compound Solution Substance X is a Mixture. Because it contains both blue dumbells and red-blue dumbells. Single coloured dumbell represents pure element . Red-blue dumbell represents compound. Substance Y is a Compound. Because it contains only blue-red dumbells. Substance Z is an Element. Because it contains only blue dumbells Substance T is a Mixture. Because it contains both red-blue dumbells and red dumbells .