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Out of atoms and molecules, which can ex...

Out of atoms and molecules, which can exist independently?

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Molecules can exist independently. However, the atoms of noble gases (He, Ne, Ar, Kr, Xe) can also exist independently.
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DINESH PUBLICATION-ATOMS AND MOLECULES-VERY SHORT ANSWER QUESTIONS
  1. Out of atoms and molecules, which can exist independently?

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  2. What does the symbol 'u'represent?

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  3. Write the chemical symbols and Latin names of (i) gold (ii) mercury?

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  4. Are the mass of a molecule of a substance and its molar mass same?

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  5. How are mass, molar mass and number of moles of a substance related to...

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  6. Avogardo's number represents how many particles?

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  7. Give an example of (i)a divalent anion (ii)a trivalent cation (iii) a ...

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  8. Calculate the molar mass of ethyl alcohol (C(2)H(5)OH).

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  9. If 16 g of oxygen contains 1 mole of oxygen atoms, calculate the ma...

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  10. What is the valency of calcium in CaCO(3)?

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  11. What happens to an element A if its atom gains two electrons?

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  12. Why is a cation so named?

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  13. An element Z forms an oxide with formula Z,O3. What is its valency?

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  14. The valency of an element A is 4. Write the formula of its oxide.

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  15. An element X has valency 3 while the element Y has valency 2. Write th...

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  16. Formula of the carbonate of a metal M is M(2)CO(3). Write the fomula o...

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  17. What do you understand from the statement "relative atomic mass of sul...

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  18. Calculate the formula unit mass of CaCl(2).

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  19. Which of the following represents the correct chemical formula? (i) ...

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  20. Sample A contains one gram molecules of oxygen molecules and sample B ...

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