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What does one mean by exothermic and end...

What does one mean by exothermic and endothermic reactions ? Give examples.

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Exothermic reactions are those reactions during which heat energy is released .
E.g. (a) `2Mg+O_(2)rarr2MgO+"Heat"`
(b) `CaO+H_(2)OrarrCa(OH)_(2)+"Heat"`
Those chemical reactions in which heat energy is required to carry out the reactions are called endothermic reactions.
E.g. (a) `CaCO_(3) overset("Heat")CaO+CO`
(b) `H_(2)+Soverset("Heat")H_(2)S`
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OSWAAL PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-NCERT CORNER (Textbook Exercises)
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  5. Translate the following statements into chemical equations and then ba...

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  6. Balance the following chemical equation. (a) HNO(3)+Ca(OH)(2)rarrCa(...

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  7. Write the balanced chemical equations for the following reactions. ...

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  8. Write the balanced chemical equation for the following and identify ...

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  9. What does one mean by exothermic and endothermic reactions ? Give exam...

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  10. Why is respiration considered an exothermic reaction ? Explain.

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  11. Why are decomposition reactions called the opposite of combination rea...

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  12. Write one equation for decomposition reactions where energy is supplie...

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  16. Explain the following in terms of gain or loss of oxygen with two exam...

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  17. A shiny brown -coloured elemnt 'X' on heating in air becomes black in ...

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  18. Why do we apply paint on iron articles ?

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  19. Oil and fat containing food items are flushed with nitrogen. Why ?

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  20. Explain the following terms with one example each . (a) Corrosion ...

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