A pure material that consists of only one type of atom and cannot be broken into two or more basic substances by physical or chemical means is referred to as an element. For example zinc, sulphur. An element is homogeneous; it is a pure product, made up of just one kind of atom.
Compounds are made up of one or more elements and are described by chemical formulas. A compound comprises atoms of various elements which are chemically mixed in a fixed ratio. A compound can be broken down into simpler compounds using chemical methods/reactions. A compound is expressed by a formula—for example, water (H2O), sodium chloride (NaCl), magnesium oxide (MgO).
In chemistry, when two or more substances are mixed without taking part in a chemical change, the resulting substance is called a mixture. The result formed by a combination of substances does not lose its individuality or is chemically combined. Mixtures are a single product of a mechanical blending or mixing of chemical substances such as elements and compounds.
|Basis of Distinction||Mixtures||Compounds|
|Definition||Mixtures are substances created by the actual combining of two or more substances.||A compound is a compound that can be created by chemically mixing two or more elements.|
|Types||Mixtures are primarily of two kinds, i.e. homogenous mixtures and heterogeneous mixtures.||Compounds can be of three types: covalent compounds, metallic compounds and ionic compounds.|
|Nature||It can be both homogenous and heterogenous||Always homogeneous|
|Properties||The mixture constituents do not lose their properties, so the mixture’s properties are usually the sum of its constituents’ properties.||The compounds’ properties are specific to themselves and do not generally constitute the constituent elements’ properties.|
|Melting and Boiling Points||Not defined||Always defined|
Most of the time, the substances we see around us are not in their pure form. Therefore, there are several types of separation techniques used to segregate a mixture of substances.
In this chapter, we learned about mixtures and compounds. We talked about the various types of separation techniques used in mixtures and some key concepts like elements and compounds.