Solutions
A solution is a homogeneous mixture of two (or more substances). A homogeneous mixture means that the mixture is just the same throughout. Some common examples of solutions are : Salt solution, Sugar solution, Vinegar, Metal alloys (such as Brass) and Air. Salt solution is a homogeneous mixture of two substances, salt and water, whereas sugar solution is a homogeneous mixture of two substances, sugar and water. Salt solution and sugar solution are also known as true solutions because in these solutions, the particles of salt and sugar are mixed so well with water that we cannot distinguish one from the other. The true solutions are also known as molecular solutions because the size of dissolved particles in such solutions is the same as that of a molecule. In this chapter, when we talk of a solution, it will mean a true solution or a molecular solution. Some more examples of the solutions are : Sea-water, Copper sulphate solution, Alcohol and water mixture,Petrol and oil mixture, Soda water, Soft drinks (like Coca Cola and Pepsi, etc.), and Lemonade (which is a sweetened drink made from lemon juice or lemon flavouring).The substances like salt, sugar, etc., which dissolve in water completely are said to be 'soluble' in water.Only soluble substances form true solutions. Copper sulphate is soluble in water. So, copper sulphate dissolves in water to form copper sulphate solution. Copper sulphate solution is a true solution which is blue in colour.
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Matter in Our Surroundings - Notes
2. 7. Metals are Solids at the Room Temperature
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5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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8. 11. Non-Metals Have Many Different Colours.
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9. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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15. 8. Metals Generally Have High Melting Points and Boiling Points.
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19. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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23. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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24. To Study the Properties of a Suspension
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25. Effect of Temperature and Pressure on Solubility
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26. Chemical Formula for daily use material
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27. Pure Substances : Elements and Compounds
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32. 1. Separation by a Suitable Solvent
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33. Solutions, Suspensions And Colloids
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36. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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39. 3. Metals are Good Conductors of Heat and Electricity.
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46. To Separate the Salt-Water Mixture (or Salt-Solution)
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47. Comparison Among the Properties of Metals and Non-Metals
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49. Differences Between Mixtures and Compounds
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