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Why should a magnesium ribbon be cleaned...

Why should a magnesium ribbon be cleaned before burning in air?

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Magnesium is a very reactive metal. When stored, it reacts with oxygen to from a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air.'
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NCERT ENGLISH-CHEMICAL REACTIONS AND EQUATIONS-Exercise
  1. Why should a magnesium ribbon be cleaned before burning in air?

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

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  3. Write a balanced chemical equation with state symbols for the followin...

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  4. A solution of the substance 'X' is used for white washing. (i) Name ...

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  5. Why is the amount of gas collected in one of the test tubes in Activit...

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  6. Why does the colour of copper sulphate solution change when an iron na...

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  7. Give an example of a double displacement reaction other than the one g...

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  8. Identify the substances that are oxidised and the substances that are ...

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  9. Which of the statements about the reaction below are incorrect? 2PbO...

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  10. Fe(2)O(3) + 2Al rarr Al(2)O(3) + 2Fe The above reaction is an exampl...

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  11. What happens when dilute hydrochloric acid is added to iron fillings? ...

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  12. What is a balanced chemical equation? Why should chemical equations be...

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  13. Translate the following statements into chemical equations and then ba...

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  14. Balance the following chemical equations.

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  15. Write the balanced chemical equations for the following reactions: (...

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  16. Write the balanced chemical equation for the following and identify th...

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

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

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

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  20. Write one equation each for decomposition reactions where energy is su...

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