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What is an exothermic reaction ? Give an...

What is an exothermic reaction ? Give an example.

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1) Reactions in which heat energy is released by the reactants is called an exothermic reaction. Eg : Burning of coal.
2) when coal burnt in oxygen, carbon dioxide is produced an also large amount of heat enery is also released.
`C+O_(2)rarr CO_(2)+Q`
3) It is an exothermic reaction. Preparation of slaked lime is also an example for exothermic reaction.
`CaO+H_(2)O rarr Ca(OH)_(2)+Q`
4) If we prepare slaked lime in a beaker by addiing water to quick lime `(CaO),` the large amount of heat is released. If we touch the walls of the beaker we will fell the hotness. So, it is an exothermic reaction.
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VGS PUBLICATION-BRILLIANT-CHEMICAL REACTIONS AND EQUATIONS-ESSENTIAL MATERIAL FOR EXAMINATION PURPOSE
  1. CaCO(3)rarrCaO+CO(2), what type of chemical reaction it is ? Explain.

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  2. Heating of calcium carbonate a) Write the chemical equation to it. ...

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  3. What is an exothermic reaction ? Give an example.

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  4. What is a thermal decomposition reaction ? Give an example.

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  5. Define oxidation and reduction. ? Give one example to each.

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  6. What double displacement reaction? Give four examples .

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  7. What is oxidation - reduction reaction or redox reaction ? Give one ex...

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  8. a) What is combustion reaction ?

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  9. a) Write the process of the effect of bleaching on coloured objects.

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  10. How chlorine changes the colours of objects? Write the chemical equati...

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  11. In a chemical formula, no subscript was written. What does indicate th...

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  12. Is Photosynthesis reaction is a chemical decomposition reaction ? Expl...

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  13. Balance the following equations. 1) Na+O(2)rarr Na(2)O

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  14. Balance the following equations. 2) H(2)O(2)rarr H(2)O+O(2)

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  15. Balance the following equations. 3) Mg(OH)(2)+HCl rarr MgCl(2)+H(2)O

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  16. Balance the following equations. 4) Fe+O(2)rarr Fe(2)O(3)

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  17. Balance the follwowing equations. 1) Al(OH)(3)rarr Al(2)O(3)+H(2)O

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  18. Balance the follwowing equations. 2) NH(3)+CuO rarr Cu+N(2)+H(2)O

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  19. Balance the follwowing equations. 3) Al(2)(SO(4))(3)+NaOH rarr Al(OH...

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  20. Balance the follwowing equations. 4) HNO(3)+Ca(OH)(2)rarr Ca(NO(3))(...

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