This Science quiz is called 'Mixing and Dissolving' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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Mixtures are created by combining materials together. Solids, liquids, and gasses can be mixed together. You will have seen some materials dissolving when you've added them to water. Sugar dissolves in water. It is a solute and water is the solvent. The mix of water and sugar is called a solution. Some other materials, like sand for example, do not dissolve in water. Instead the particles are spread out when you shake the mixture. This is called a suspension. The particles in a suspension will eventually settle to the bottom.
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The name should have given it away! Combination means joined together or mixed
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Water will dissolve sugar but will not dissolve sand
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A very fine sieve would separate the coarsest sand from the salt, but it would also allow fine sand to pass through its holes
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Solids can be dissolved in liquids, creating a solution - a solution is not a new substance, however; it is a mixture of two or more materials or substances
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The water can evaporate but salt cannot so it will be left behind
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Stirring, using smaller particles (by crushing, if necessary), and heating the liquid all help materials to dissolve more quickly
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A good example of a suspension is a jar of muddy water - if you look closely, you can see particles suspended (floating) in the water
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When salt is dissolved into water, the salt is a solute, the water is the solvent and the mixture is called a solution
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Although a candle would melt in very hot water, wax will not dissolve in water - remember that melting and dissolving are not the same process
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A solution in which no more material can be dissolved is called 'saturated'
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