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Explain why , hydrogen and oxygen ar...

Explain why , hydrogen and oxygen are considered elements whereas water is not considered an element .

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LAKHMIR SINGH & MANJIT KAUR-IS MATTER AROUND US PURE -Exercise
  1. State three reasons why you think air is a mixture and water ...

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  2. Name two solid , two liquid and two gaseous elements at the r...

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  3. Explain why , hydrogen and oxygen are considered elements where...

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  4. what are the three group into which all the elements can be div...

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  5. State two physical properties on the basis of which metals can ...

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  6. Compare the properties of metals and non -metals with respect to...

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  7. state any two properties for believing that aluminium is a meta...

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  8. Give reason why : (a) Copper metal is used for making electric...

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  9. How would you confirm that a colourless liquid given to you is pu...

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  10. Choose the solutions from among the following mixttures : Soil,...

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  11. state three reasons why you think air is a mixture and water ...

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  12. state three reasons why you think air is a mixture and water ...

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  13. Define a compounds Give two points of evidence to show that sodi...

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  14. Define a mixture ,Give two points of evidence to show that su...

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  15. state two reasons for supposing that brass is a mixture and no...

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  16. List five characteristics by which compounds can be distingushed ...

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  17. Explain why ,a solution of salt in water is comsidered a mixture ...

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  18. state one property in which a solution of sugar in water resembl...

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  19. How will you distinguish a colloid from a solution ?

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  20. Name a non- metal: (a) which is lustrous (b) which is requi...

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