Physical and chemical changes
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1. The change which is generally reversible is *
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2. A change in which one or more new substances are formed is called a *
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3. Which among the following is the example for a chemical change *
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4. Cutting a piece of paper into four square pieces is an activity based on physical change. In this the change takes place in the *
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5. In the activity burning of a magnesium ribbon magnesium ribbon burns with a dazzling white light leaving behind a powdery Ash. When this powdery Ash is mixed with small amount of water and  few drops of magnesium oxide solution is dropped in red and blue litmus Paper, the colour of red litmus paper turns to blue showing that magnesium hydroxide is *
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6. The colour of copper sulphate solution and iron sulphate solution is *
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7. When carbon dioxide gas is passed through freshly prepared lime water then the lime water turns *
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8. We can confirm that a chemical reaction is taking place when heat or light is produced ,there is change in the colour and odour ,formation of a gas taking place ,change in the temperature ,and sound may be produced. *
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9. If the content of water is more in the air then n *
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10. The process of formation of large crystals of pure substances from their solution is called *
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