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Q&A HomeClass 9CBSEChemistryAtoms and Molecules
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Chapter 3

Atoms and Molecules

Chemistry•Class 9•CBSE

11 Questions Available

Showing 11 questions on this page

1

Explain law of constant proportion.

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2

What is the ratio by mass of combining elements in H2O, CO2 and NH3?

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3

Write down the formula for:

Copper nitrate, calcium sulphate and aluminium hydroxide.

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4

Give the Latin name for sodium, potassium, gold and mercury.

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5

What is polyatomic ton? Give one example.

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6

What is meant by atomic mass, gram atomic mass of an element? Why is the mass have different expressions i.e., 'u' and 'g'?

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7

Consider the compound calcium carbonate (CaCO3).

 (a) Name the elements present in calcium carbonate.

 (b) Calculate its formula unit mass. (Atomic masses: Ca = 40u, C = 12u, O = 16u)

(c) If a sample of calcium carbonate contains 6.022 × 1023 formula units, what would be its mass in grams?

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8

What is formula unit mass? How is it different from molecular mass?

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9

Define valency and give the valency for the following elements:

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10

Give the atomicity of phosphorous and nitrogen.

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11

What is atomic mass unit?

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