Activity 1.1
Clean a magnesium ribbon by rubbing it with sandpaper to remove layer of carbonate and oxide. Burn it using a spirit lamp you get white ash of MgO. Mg (s) + O2(g) à MgO(s) => Magnesium ribbon burn with dazzling light and white powder of MgO is formed which is basic in nature It is an example of combination reaction in which single compound break into two or more substance. Activity 1.2 (Experiment): Take lead nitrate solution in a test tube. Add potassium iodide solution to this. => Yellow precipitate PbI2 is formed. Substance Insoluble in water is called precipitate. Pb(NO3)2 (aq) + 2KI à PbI2(s) (¯) + 2 KNO3 (aq) This is an example of precipitation reaction . This is an example of Double decomposition reaction in which there is exchange of radicals. Activity 1:3 (Experiment): Take a few zinc granules in a conical flask or a test tube. Add dilute hydrochloric acid or sulphuric acid to this. => The bubble of hydrogen gas is observed. The temperature of flask increases due to release of heat energy. Zn(s) + HCl(l) --à ZnCl2 (aq) + H2 ( ) This is called Exothermic reaction as there is release of heat . This is an example of Single displacement reaction in which more reactive element displace less reactive element from compound. Read full post NCERT Activity
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Activity 3.1 Page No. 37
Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample. They have a shining surface. Clean the surface of each sample by rubbing them with sand paper and note their appearance again. They become more shiny. => Freshly cut Metal have shiny surface Activity 3.2 Page No. 37 Take small pieces of iron, copper, aluminium, and magnesium. Try to cut these metals with a sharp knife and note your observations. They are very hard to cut. Hold a piece of sodium metal with a pair of tongs and try to cut it with a knife. Sodium can be cut easily with knife. Hence K and Na are soft metal cut with knife Activity 3.3 Page No. 38 Take pieces of iron, zinc, lead and copper try to strike it four or five times with a hammer. These metals are beaten into thin sheet on hammering. This property of metal is called malleability and metals are called malleable. Activity 3.4 Page No. 38 Take some metals such as iron, copper, aluminium, lead, etc. Which of the above metals are also available in the form of wires? Read full paper Read full post Biology Practice Papers-1 Solution / VP-1 Practice Papers-2 Solution / VP-2 Practice Papers-3 Solution / VP-3 Practice Papers-4 Solution / VP-4 Chemistry Practice Papers-1 Solution / VP-1 Practice Papers-2 Solution / VP-2 Practice Papers-3 Solution / VP-3 Practice Papers-4 Solution / VP-4 Practice Papers-5 Solution / VP-5 Mathematics Practice Papers-1 Solution / VP-1 Practice Papers-2 Solution / VP-2 Practice Papers-3 Solution / VP-3 Practice Papers-4 Solution / VP-4 Practice Papers-5 Solution / VP-5 For all subjects download Pdf :
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