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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