Chemistry

Atoms and Molecules

Some Ionic Compounds

Name	Formula	Ions present
1.Sodium chloride 2.Potassium chloride 3.Ammonium chloride 4.Magnesium chloride 5.Calcium chloride 6.Magnesium oxide 7.Calcium oxide 8.Aluminium oxide 9.Sodium hydroxide 10.Copper sulphate 11.Calcium nitrate	NaCl KC1 $NH$ ₄Cl $MgCl$ ₂ $CaCl$ ₂ $M$ _gO CaO $Al$ ₂O₃ NaOH $CUSO$ ₄ $Ca(N0$ ₃)₂	$Na$ ⁺ and $Cl$ ^- $k$ ⁺ and $Cl$ ^- $NH$ ₄⁺ and $Cl$ ^- $Mg$ ²⁺ and $Cl$ ^- $Ca$ ²⁺ and $Cl$ ^- $Mg$ ²⁺ and $O$ ^2- $Ca$ ²⁺ and $O$ ^2- $Al$ ³⁺ and $O$ ^2- $Na$ ⁺ and $OH$ ^- $CU$ ²⁺ and $SO$ ₄^2- $Ca$ ²⁺ and $NO$ ₄^3-

Please note that all the above ionic compounds are made up of a metal and a non-metal (except ammonium chloride which is an ionic compound made up of only non-metals). So, whenever we see a compound made up of a metal and a non-metal,we should at once say that it is an ionic compound. We will now solve one problem based on ionic compunds.
Sample Problem. Write down the names of compounds represented by the following formulae. Also show the ions present in them :

Al

₂(SO₄)₃ (ii)

CaCl

₂ (iii)

K

₂SO₄ (iv)

KNO

₃(v)

CaCO

₃
Solution.(i)

Al

₂(SO₄)₃ is aluminium sulphate. Ions present are :

Al

³⁺ and

SO

₄^2-
(ii)

CaCl

₂ is calcium chloride. Ions present are :

Ca

² and

Cl

^-
(iii)

K

₂SO₄ is potassium sulphate. Ions present are :

K

⁺ and

SO

₄^2-
(iv)

KNO

₃ is potassium nitrate. Ions present are :

K

⁺ and

NO

₃^2-
(v)

CaCO

₃ is calcium carbonate. Ions present are :

Ca

²⁺ and

CO

₃^2-

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Notes

Atoms and Molecules - Notes

1. Drawbacks of Dalton’s Atomic Theory

2. Monovalent Cations (Cations Having a Valency of 1+)

3. Divalent Cations (Cations Having a Valency of 2+)

4. Dalton’s Symbols of Elements

5. Trivalent Cations (Cations Having a Valency of 3+)

6. Formulae of Some Molecular Compounds

7. An Important Discussion

8. Molecular Formulae of Some Common Elements

9. an example, let us give the significance of symbol C

10. Molecules

11. As an example, let us give the significance of the formula H₂O

12. Chemical Formulae

13. 2. A Negatively Charged Ion is Known as Anion

14. Molecules of Compounds

15. Molecular Mass

16. Explanation of the Law of Conservation of Mass

17. Atoms, Molecules and Ions

18. Some Ionic Compounds

19. Atoms

20. Formula Mass

21. Mole of Molecules

22. Formulae of Elements

23. 1. A Positively Charged Ion is Known as Cation

24. 1. Molecules of Elements

25. John Dalton

26. Simple Ions and Compound Ions (Polyatomic Ions)

27. Gram Atomic Mass And Gram Molecular Mass

28. Symbols of Elements

29. Mole of Atoms

30. Formulae of Compounds

31. Explanation of the Law of Constant Proportions

32. Dalton's Atomic Theory

33. Ions

34. Significance of the Formula of a Substance

35. Some Common Ions

36. Molecular Masses of Some Common Elements

37. Calculation of Molecular Mass

38. Laws Of Chemical Combination

39. Ionic Compounds

40. How Do Atoms Exist

41. Formula Unit of Ionic Compounds

42. Problems Based On Moles Of Molecules

43. Divalent Anions (Anions Having a Valency of 2-)

44. Experiment to Verify Law of Conservation of Mass

45. Atoms And Molecules

46. Writing Of Formulae Of Ionic Compounds

47. Gram Molecular Mass

48. Gram Atomic Mass

49. Mole Concept

50. Problems Based On Moles Of Atoms