Atoms and Molecules (Practice Sheet, Class 9)

(1) What are the laws of chemical combination? State.

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(2) Write difference between atomic mass and molecular mass.

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(3)What is the atomicity? Give an example.

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(4)What is ion?

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(5)Write the chemical formula of H2O and H2S.

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(6) What is molecular mass? Calculate the molecular mass of H2O2.

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(7)What is mole?

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(8) Convert 12 g of nitrogen in to mole.

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(9)What is the mass of 0.5 moles of oxygen atoms?

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(10) Calculate mass of the 6.022 ×1023 number of N2 molecules (mass from number).

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Helping Topics

Atoms and Molecules

NCERT solutions, class 9

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