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When we mix two different pure substances together, like this, it’s a mixture. This is now a mixture of the elements iron and sulfur. The different elements are not joined together.
A mixture contains different substances that are not chemically joined to each other. For example, a packet of sweets may contain a mixture of different coloured sweets.
Chemical compounds are very different from mixtures: The elements in a chemical compound can only be separated by destroying the compound. Some of the differences between chemical compounds and mixtures of elements are illustrated by the following example using raisin bran and "Crispix.".
So, let’s put a flow chart showing how matter is classified into pure substances and mixtures: Elements and Compounds. Looking at the left side of the chart, we can see that a pure substance can be either an element or a compound. For example, we mentioned that oxygen is a compound as it consists of two oxygen atoms connected by covalent bonds.
Aug 23, 2019 · If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture. If its composition is uniform throughout, it is a homogeneous mixture.
Identify each substance as a compound, an element, a heterogeneous mixture, or a homogeneous mixture (solution).
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Two broad categories are mixtures and pure substances. A pure substance has a constant composition. Any pieces of a pure substance have exactly the same makeup and properties. For example, any sample of sucrose (table sugar; Figure 2) consists of 42.1% carbon, 6.5% hydrogen, and 51.4% oxygen by mass.
