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Mixtures and Solutions

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Types of Mixtures
Mixtures can be homogeneous or heterogeneous.
1. Heterogeneous mixture does not blend smoothly throughout; the individual substances remain distinct.
Two categories of heterogeneous mixture are suspensions and colloids.
A. Suspensions are mixtures containing particles that settle out if left undisturbed.
B. Colloids are mixtures containing mid-size particles that do not settle out.

2. Homogeneous mixture contains substances that are fully blended; you cannot tell the difference between the substances.
A solution is a homogeneous mixture containing atoms, ions, or molecules fully dissolved. (This is a physical change.)
Solvent - dissolving medium
Solute - the substance getting dissolved



Difference between solute, solvent and solution
Solutes + solvents = solutions What are solutes and solvents, and why are solutions so important to us?


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