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

5. Dalton’s Symbols of Elements

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

7. Formulae of Some Molecular Compounds

8. An Important Discussion

9. Molecular Formulae of Some Common Elements

10. Explanation of the Law of Conservation of Mass

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

12. Molecules

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

14. Molecules of Compounds

15. Simple Ions and Compound Ions (Polyatomic Ions)

16. Formulae of Elements

17. Chemical Formulae

18. Some Ionic Compounds

19. Symbols of Elements

20. Molecular Mass

21. Gram Atomic Mass And Gram Molecular Mass

22. Atoms

23. Formulae of Compounds

24. Formula Mass

25. Atoms, Molecules and Ions

26. 1. Molecules of Elements

27. Mole of Atoms

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

29. Ions

30. Mole of Molecules

31. Dalton's Atomic Theory

32. Laws Of Chemical Combination

33. Calculation of Molecular Mass

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

35. Molecular Masses of Some Common Elements

36. Some Common Ions

37. Explanation of the Law of Constant Proportions

38. John Dalton

39. Significance of the Formula of a Substance

40. Formula Unit of Ionic Compounds

41. Ionic Compounds

42. Symbols Derived from Latin Names of the Elements

43. Atomic Mass Of An Element

44. Modern Symbols of Elements

45. Valencies of Some Common Metal Elements Valencies of Some Common Non-Metal Elements

46. Atomic Masses of Some Common Elements

47. Writing Of Formulae Of Molecular Compounds

48. Laws Of Conservation of Mass

49. Problems Based On Moles Of Atoms

50. Atoms And Molecules