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
1. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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2. 11. Metals Usually Have a Silver or Grey Colour
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5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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9. To Study the Properties of a Colloid
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12. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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14. Separation Of Mixture Of a Solid And a Liquids
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16. 1. Separation by a Suitable Solvent
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18. 6. Metals are Usually Strong. They Have High Tensile Strength.
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19. To Separate a Mixture of Alcohol and Water
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21. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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22. To Study the Properties of a Compound of Iron and Sulphur
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25. To Study the Properties of a Solution
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28. Separation of Mixture Of Two Solids
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29. 3. Metals are Good Conductors of Heat and Electricity.
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30. 11. Non-Metals Have Many Different Colours.
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32. Chemical Formula for daily use material
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34. To Separate the Salt-Water Mixture (or Salt-Solution)
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45. 7. Metals are Solids at the Room Temperature
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46. 4. Metals are Lustrous (or Shiny), and can be Polished.
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