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Write any two observations in an activit...

Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.

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LAKHMIR SINGH & MANJIT KAUR-CHEMICAL REACTIONS AND EQUATIONS -Exercise
  1. (a) What is a balanced chemical equation ? Why should chemical equatio...

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  2. (a) Explain with example, how the physical states of the reactants and...

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  3. Write any two observations in an activity which may suggest that a che...

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  4. (a) Aluminium hydroxide reacts with sulphuric acid to from aluminium s...

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  5. Write the balanced equations for the following reactions, and add the ...

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  6. Carbon monoxide reacts with hydrogen under certain conditions to from ...

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  7. (a) Potassium chlorate (KClO(3)) on heating forms potassium chloride a...

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  8. (a) Substitute formulae for names and balance the following equation: ...

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  9. Ammonia reacts with oxygen to from nitrogen and water. Write a balance...

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  10. Write a balanced chemical equation for the process of photosynthesis g...

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  11. Write the balanced equation for the following chemical reactions. (i...

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  12. When potassium nitrate is heated. It decomposes into potassium nitrite...

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  13. (a) What is meant by a chemical reaction ? Explain with the help of an...

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  14. (a) State the various characteristics of chemical reactions. (b) sta...

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  15. (a) What do you understned by exothermic and endothermic reactions ? ...

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  16. One of the following does not happen during a chemical reaction. This ...

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  17. Which of the following does not involve a chemical reaction?

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  18. You are given the solution of lead nitrate. In order to obtain a yello...

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  19. An acid which can decolourise purple coloured potassium permanganate s...

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  20. The chemical reaction between two substances is characterised by a cha...

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