Any given spoonful of soup will contain varying amounts of the different vegetables and other components of the soup. Vegetable soup is a heterogeneous mixture. All solutions would be considered homogeneous because the dissolved material is present in the same amount throughout the solution.Ī heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. The amount of salt in the salt water can vary from one sample to another. The difference is that the composition of the substance is always the same. Often it is easy to confuse a homogeneous mixture with a pure substance because they are both uniform. The salt water described above is homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. It retains its composition and properties.Ī homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. Only the form of the salt is changed when it is dissolved into water. A mixture is a physical blend of two or more components, each of which retains its own identity and properties in the mixture. You may dissolve a small amount of salt or a large amount into a given amount of water. Salt easily dissolves in water, but salt water cannot be classified as a pure substance because its composition can vary. All samples of sodium chloride are chemically identical. It is considered a pure substance because it has a uniform and definite composition. Ordinary table salt is called sodium chloride. A material composed of two or more substances is a mixture. A pure substance is a form of matter that has a constant composition (meaning it's the same everywhere) and properties that are constant throughout the sample (meaning there is only one set of properties such as melting point, color, boiling point, etc. Matter can be classified into two broad categories: pure substances and mixtures.
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