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In a class, a teacher asked students to ...

In a class, a teacher asked students to write the molecular formula of oxygen. Shamita wrote the formula as `O_2`, and Priyanka as O. Which one is correct? State the reason.

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VGS PUBLICATION-BRILLIANT-ATOMS ,MOLECULES AND CHEMICAL REACTIONS-EXERCISE
  1. The atomic number (Z) of an element is 6. name the element.

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

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

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

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  5. Ravi wrote the symbols for sodium as “S” and symbol for potassium as...

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  6. Dheeraj argued that number of molecules in 18 units of water and 18 g...

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  7. What is atomic mass?

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  8. What is the molecular formula of water ?

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  9. What is the molecular mass of water?

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  10. What are the units of molecular mass ?

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  11. Define the terms : Mole.

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  12. What is the molecular mass of water?

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  13. What are.the units of molar mass?

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  14. How many molecules are there in 18 grams of water?

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  15. How many molecules are there in 18 grams of water?

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  16. We write symbol of water as H2O. State why should not we write it HO2'...

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

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  18. A student was given the following substances and was asked to show typ...

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  19. Why does respiration considered as an exothermic reaction ? Explain.

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  20. Is 'Na' an element or compond? Why

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