Chemistry

Atoms and Molecules


Molecules of Compounds


The molecule of a compound contains two (or more) different types of atoms chemically combined together.For example, hydrogen chloride is a compound. The molecule of hydrogen chloride (HC1) contains two different types of atoms : hydrogen atom (H) and chlorine atom (Cl) [see Figure 29(a)], Water is a compound.A molecule of water (H2O) is made up of two different types of atoms : hydrogen atoms (H) and oxygen atom (O) [see Figure 29(b)]. Carbon dioxide (CO2) is also a compound whose molecule consists of two different types of atoms : carbon atom (C) and oxygen atoms (O) [see Figure 29(c)]. Some more examples of the molecules of compounds are : sulphur dioxide (SO2), methane (CH4) and ammonia (NH3).Please note that a compound which consists of molecules is called a molecular compound.Hydrogen chloride, water, carbon dioxide, sulphur dioxide, methane and ammonia,are all molecular compounds (which consist of molecules and not ions). We will now discuss chemical formulae.

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Notes
Atoms and Molecules - Notes
1. Drawbacks of Dalton’s Atomic Theory
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2. Monovalent Cations (Cations Having a Valency of 1+)
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3. Dalton’s Symbols of Elements
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4. Divalent Cations (Cations Having a Valency of 2+)
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5. Trivalent Cations (Cations Having a Valency of 3+)
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6. Formulae of Some Molecular Compounds
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7. An Important Discussion
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8. Molecular Formulae of Some Common Elements
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9. an example, let us give the significance of symbol C
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10. As an example, let us give the significance of the formula H2O
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11. Chemical Formulae
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12. 2. A Negatively Charged Ion is Known as Anion
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13. Molecules
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14. Molecular Mass
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15. Molecules of Compounds
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16. Explanation of the Law of Conservation of Mass
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17. Some Ionic Compounds
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18. Atoms, Molecules and Ions
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19. Atoms
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20. Formula Mass
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21. Mole of Molecules
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22. Formulae of Elements
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23. 1. A Positively Charged Ion is Known as Cation
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24. Simple Ions and Compound Ions (Polyatomic Ions)
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25. 1. Molecules of Elements
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26. Symbols of Elements
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27. Gram Atomic Mass And Gram Molecular Mass
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28. John Dalton
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29. Mole of Atoms
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30. Formulae of Compounds
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31. Ions
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32. Explanation of the Law of Constant Proportions
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33. Dalton's Atomic Theory
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34. Significance of the Formula of a Substance
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35. Some Common Ions
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36. Molecular Masses of Some Common Elements
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37. Ionic Compounds
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38. Laws Of Chemical Combination
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39. Calculation of Molecular Mass
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40. Formula Unit of Ionic Compounds
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41. Divalent Anions (Anions Having a Valency of 2-)
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42. Atoms And Molecules
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43. How Do Atoms Exist
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44. Writing Of Formulae Of Ionic Compounds
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45. Problems Based On Moles Of Molecules
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46. Experiment to Verify Law of Conservation of Mass
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47. Gram Molecular Mass
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48. Gram Atomic Mass
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49. Laws Of Conservation of Mass
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50. Atomic Radii of Some Common Elements
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