The Case of Alloys
Alloys are homogeneous mixtures of metals and cannot be separated into their components by physical methods. Even then an alloy is considered a mixture because : (i) it shows the properties of its constituents, and (ii) it has a variable composition. For example, brass is a homogeneous substance composed of copper and zinc, and cannot be separated into its constituents by physical methods. Brass is considered a mixture because: (i) it shows the properties of its constituents, copper and zinc, and (ii) it has a variable composition (The amount of zinc in brass can vary from 20 to 35 per cent).Before we go further and discuss solutions, suspensions and colloids, please answer the following questions :
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Matter in Our Surroundings - Notes
2. 7. Metals are Solids at the Room Temperature
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4. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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9. 11. Non-Metals Have Many Different Colours.
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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. Effect of Temperature and Pressure on Solubility
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25. To Study the Properties of a Suspension
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26. Chemical Formula for daily use material
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30. Pure Substances : Elements and Compounds
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33. 1. Separation by a Suitable Solvent
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34. 3. Metals are Good Conductors of Heat and Electricity.
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35. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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36. Solutions, Suspensions And Colloids
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43. 6. Metals are Usually Strong. They Have High Tensile Strength.
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46. Differences Between Mixtures and Compounds
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48. Separation Of Mixture Of a Solid And a Liquids
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50. Comparison Among the Properties of Metals and Non-Metals
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