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LAKHMIR SINGH & MANJIT KAUR-PHYSICAL AND CHEMICAL CHANGES-EXERCISE
- Explain why, rusting of Iron objects is faster in coastal areas than i...
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- What is meant by galvanisation? Why is it done?
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- State two ways to prevent the rusting of iron.
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- What is stainless steel ? How is stainless steel made ? State an impor...
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- State three differences between a physical change and a chemical chang...
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- Write a word equation to represent the process of rusting of iron. Als...
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- Explain why, explosion of a firework (such as cracker) is said to be a...
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- Explain why, melting of ice to form water is said to be a physical cha...
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- What is meant by crystallisation ? State its one use.
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- 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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