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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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VGS PUBLICATION-BRILLIANT-ATOMS ,MOLECULES AND CHEMICAL REACTIONS-EXERCISE
  1. Write difference between oxidation and reduction reactions.

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  2. Give tw0 example for chemical reactions in which precipitate is form...

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

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  4. What is an alloy ? Give two examples for alloys.

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  5. What is a photochemical reaction? Give one example.

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  6. What do you mean by precipitation reaction ?

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  7. How would you write 2 molecules of Oxygen and 5 molecules of Nitrogen ...

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  8. What do you mean by corrosion? How can you prevent it ?

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  9. Explain rancidity.

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  10. MnO(2)+4HCl rarr MnCl(2)+2H(2)O+Cl(2) In the above equation, name th...

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  11. Which are known as molecules ?

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  12. Expand IUPAC.

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  13. What are the reactants and products in a chemical reaction?

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  14. In the refining of silver, the recovery of silver from silver nitrate ...

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  15. What is the difference between 2N and N2?

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  16. Mohan said "O2 differs from O," Do you agree? Justify.

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  17. The atomic number (Z) of an element is 6. name the element.

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  18. Write any one precautions in doing the experiment chromatography.

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  19. In a class, a teacher asked students to write the molecular formula of...

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  20. Anitha wrote the formula for oxygen molecule as 2O. Is it correct or n...

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