Related InterviewSolutions

• Kindling fire by pouring oil. Heap up some potassium permanganate on a tile. Keep a piece of dry cotton wick on top of it. Pour one or two drops of glycerine on the wick. Observe the changes.
• Give two examples of covalent compounds.
• Write a chemical equation (unbalanced) for the following reaction:Magnesium salts during the softening of hard water.Magnesium chloride + Sodium carbonate \(\longrightarrow\) Magnesium carbonate + Sodium chloride
• Name the salts present in hard water.
• Give two examples of ionic compounds.
• State whether the following statements are True or False. (If a statement is false, correct it and rewrite it.)(i) H2O Molecule is an ionic compound.(ii) The bond between two chlorine atoms is a covalent band(iii) Arrow indicates the direction of the reaction.
• Distinguish between the following:Physical change and Chemical change:
• What are the methods of classification of changes?
• State whether the following statements are True or False. (If a statement is false, correct it and rewrite it.)(i) The preparation of cold drink soda- lemon is a physical change.(ii) Hard water contains the chloride and sulphate salts of calcium and magnesium in dissolved state.(iii) Combustion of fuel is a fast and irreversible manmade chemical change.(iv) Photosynthesis reaction is a man-made chemical change.
• What is the difference between physical and chemical change?