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When hydrogen burns in oxygen, water is ...

When hydrogen burns in oxygen, water is formed, when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases.

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ICSE-CHEMICAL CHANGES AND REACTIONS-EXERCISE 2(B)
  1. A catalyst either ........... or ............. the rate of a chemical ...

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  2. On heating, hydrated copper sulphate changes its colour from ............

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  3. When hydrogen burns in oxygen, water is formed, when electricity is pa...

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  4. Explain, giving one example for each of the following chemical changes...

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  5. Explain, giving one example for each of the following chemical changes...

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  6. Explain, giving one example for each of the following chemical changes...

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  7. Explain, giving one example for each of the following chemical changes...

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  8. What is synthesis ?

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  9. What kind of chemical reaction is synthesis ? Support your answer by a...

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  10. Decomposition brought about by heat is known as thermal decomposition....

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  11. Define neutralization reaction with an example.

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  12. Give three applications of neutralization reactions.

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  13. What do you understand by precipitation reaction ? Explain with an exa...

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  14. What are double displacement reactions ?

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  15. Give an example of double displacement reaction, where a gas is evolve...

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  16. What is a decomposition reaction ?

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  17. Decomposition reactions can occur by (i) heat (ii) electricity and (ii...

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  18. State the type of reactions each of the following equations represent ...

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  19. State the type of reactions each of the following equations represent ...

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  20. State the type of reactions each of the following equations represent ...

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