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What do you mean by significant figures?...

What do you mean by significant figures?

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CHHAYA PUBLICATION-SOME BASIC CONCEPTS OF CHEMISTRY-SOLVED NCERT EXERCISE
  1. What is the SI unit of mass? How is it defined?

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  2. Match the following prefixes with their multiplies:

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  3. What do you mean by significant figures?

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  4. A sample of drinking water was found to be severely contaminated with ...

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  5. Express the following in the scientific natation: (1) 0.0048 (2) 2...

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  6. How many significant figures are present: (1) 0.0025 (2) 208 (3) 5...

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  7. Round up the following upto three significant figures: (1) (1) 34.21...

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  8. The following data are obtained when dinitrogen and dioxygenn react to...

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  9. If the speed of light is 3.0xx10^(8)m*s^(-1), calculate the distance c...

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  10. In a reaction A+B(2) to AB(2). Identify the limiting reagent, if any, ...

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  11. N(2) and H(2) react with to produce ammonia according to the equation:...

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  12. How are 0.5 mol Na(2)CO(3) and 0.5(M) Na(2)CO(3) different?

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  13. If ten volumes of dihydrogen gas reacts with five volumes of dioxygen ...

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  14. Convert the followingn into basic units: (1) 28.7 pm (2) 15.15 pm ...

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  15. Which of the following will have largest no. of atoms? (1) 1 g Au (g...

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  16. Calculate the molarity of a solution of ethanol in water in which the ...

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  17. What will be the mass of one ""^(12)C atom in g?

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  18. How many significant figures should be present in the answer of the fo...

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  19. Use the data given in the following table to calculate the molar mass ...

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  20. Calculate the number of atoms in each of the following (1) 52 moles of...

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