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LAKHMIR SINGH & MANJIT KAUR-PHYSICAL AND CHEMICAL CHANGES-EXERCISE
- Describe how, crystals of copper sulphate are prepared.
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- Give example of a chemical change which occurs by the action of heat.
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- Give example of a physical change which occurs by the action of heat.
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- What is a (a) physical change, and (b) chemical change ? Give two exam...
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- What is meant by the rusting of iron ? State two conditions necessary ...
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- What happens when an iron nail is kept immersed in copper sulphate sol...
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- What happens when baking soda is added to vinegar ? Write a word equat...
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- What happens when carbon dioxide gas is passed through lime water ? Wr...
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- When baking soda is mixed with lemon juice, bubbles are formed with th...
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- When a candle burns, both physical and chemical changes take place. Id...
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- Explain why, burning of wood and cutting of wood into small pieces are...
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- What happens when magnesium ribbon is burned in air ? Write a word equ...
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- What happens when magnesium oxide is dissolved in water ? Write a word...
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- Which one of the following is not a chemical change ?
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- Which of the following are physical changes? (i) Melting of iron met...
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- Which of the following are chemical changes? (i) Decaying of wood ...
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- Which one of the following change can be reversed ?
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- Which of the following is not a physical change ?
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- When ice-cream melts : A. Heat is lost from the ice-cream B. Heat ...
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- Which of the following is a chemical change ?
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