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What are the rules you have to follow wh...

What are the rules you have to follow while writing a chemical formula?

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1. The valancies or charge on the ion must balance.
2. When a compound consists of metal and non-metal , the name of the symbol of metal is written first. Eg: calcium oxide (CaO)
3. In compounds formed with poly atomic ions, the ion is enclosed in a bracket before writing the number to indicate the ratio.
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VGS PUBLICATION-BRILLIANT-ATOMS AND MOLECULES-ESSENTIAL MATERIAL FOR EXAMINATION PURPOSE (4 MARK)
  1. Explain the method of writing a formula to a compound using criss-cros...

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  2. Define the terms : Molecular mass.

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  3. Define the terms : Formula unit mass

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  4. Define the terms : Mole.

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  5. What are the main postulates of Dalton's atomic theory? (OR) Write t...

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  6. what is the defination of incident ray and reflected ray?.

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  7. Illustrate the concept of mole through a diagram.

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  8. How can you appreciate John Dalton for proposing his atomic theory?

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  9. How do you feel after studying the symbols and formulae of different e...

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  10. Describe the experiment conducted by Joseph L., Proust, which lead him...

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  11. Write down the formulae of these compounds, using criss-cross methods?...

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  12. Write down the formulae of these compounds, using criss-cross methods?...

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  13. Write down the formulae of these compounds, using criss-cross methods?...

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  14. Write down the formulae of these compounds, using criss-cross methods?...

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  15. Write down the names of compounds represented by the following formula...

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  16. What are the rules you have to follow while writing a chemical formula...

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  17. Calculate the molecular weight H2,O2,Cl2,CO2CH4,C2H6,C2H4,NH3,CH3OH.

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  18. What is atomicity?

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  19. Which mirrors are called spherical mirrors? how many types are they?

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  20. Why do elements have different atomicities?

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