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Difine a chemical reaction. Which observ...

Difine a chemical reaction. Which observations help you to determine whether a chemical reaction has taken place ?

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A chemical reaction is a process that leads to the transformation of one set of chemical substances into another. A chemical reaction can be identified by the following observations :
• Change is state • Change in colour
• Change in temperature • Evolution of gases
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ZEN PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER [SA] TYPE 2 QUESTIONS )
  1. Write a chemical equation of a reaction where the following change hav...

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  2. Write a chemical equation of a reaction where the following change hav...

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  3. Difine a chemical reaction. Which observations help you to determine w...

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  4. Balance the following chemical equations : Mg+N(2)toMg(3)N(2)

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  5. Balance the following chemical equations : Al+Cl(2) toAlCl(3)

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  6. Balance the following chemical equations : NH(3)+CuO to Cu+N(2)+H(2)...

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  7. What are thermochemical reactions ? Give two examples.

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  8. Write the balanced chemical equation for the process of photosynthesis...

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  9. Classify the following reactions as exothermic or endothermic. (i) e...

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  10. 2g of ferrous sulphate crystals are heated in a dry tude. List any t...

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  11. 2g of ferrous sulphate crystals are heated in a dry tude. Name the t...

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  12. 2g of ferrous sulphate crystals are heated in a dry tude. Name the t...

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  13. Discuss the importance of decomposition reaction in metal industry wit...

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  14. On passing excess carbon dioxide gas through lime water, it first turn...

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  15. A student dropped a few pieces of marble chips in dilute hydrochloric ...

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  16. Write the chemical equation for reaction when lead nitrate and potassi...

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  17. A student has mixed the solution of lead (II) nitrate and potassium io...

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  18. A student has mixed the solution of lead (II) nitrate and potassium io...

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  19. A brown substance 'X' on heating in air forms a substance 'Y'. When hy...

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  20. A brown substance 'X' on heating in air forms a substance 'Y'. When hy...

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