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SS2: CHEMISTRY - 1ST TERM

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  1. Periodicity and Periodic Table I | Week 1
    5 Topics
    |
    1 Quiz
  2. Quantum Numbers Orbitals & Electrical Structure | Week 2
    6 Topics
    |
    1 Quiz
  3. Periodicity and Periodic Table II | Week 3
    12 Topics
    |
    1 Quiz
  4. Periodicity and Periodic Properties III | Week 4
    11 Topics
    |
    1 Quiz
  5. Periodicity and Periodic Properties IV | Week 5
    5 Topics
    |
    1 Quiz
  6. Mass-Volume Relationship in Reaction | Week 6
    8 Topics
    |
    1 Quiz
  7. Types of Reactions: Oxidation and Reduction | Week 7 & 8
    7 Topics
    |
    1 Quiz
  8. Oxidation – Reduction Reaction II | Week 9
    3 Topics
    |
    1 Quiz
  9. Electrode Potential and Electrochemical Cells I | Week 10
    6 Topics
    |
    1 Quiz
  10. Electrode Potential and Electrochemical Cells II | Week 11
    5 Topics
    |
    1 Quiz
  11. Electrolysis I | Week 12
    8 Topics
    |
    1 Quiz
  12. Electrolysis II | Week 13
    8 Topics
    |
    1 Quiz

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Topic Content:

  • Theory Questions and Answers – Periodicity and Periodic Properties IV

Theory Questions – Periodicity and Periodic Properties IV:

1.

(a) What are transition Elements?
(b) State, with examples, four characteristic properties of transition Elements.
(c) Which of the following metals belongs to the first transition Series?  Chromium, Lead, Sodium, Manganese, Aluminium.

2.

(a) Explain why transition metals have variable Oxidation states
(b) Give the reason why Zinc, 30Zn does not exhibit the characteristics properties of transition Elements.

3.

(a) The Oxidation number of Copper in its compounds is either +1 or +2. Give the name and formula of a compound in which Copper has (i) +1 Oxidation State   (ii) +2 Oxidation State

(b)(i) What is a Complex Ion
(ii) Name two metals that form Complex Ions, giving an example in each case   

 

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Evaluation Questions

    1(a) What are transition Elements?

    Answer: Transition elements are elements with partially filled d-orbitals.

     

    (b) State, with examples, four characteristic properties of transition Elements.

    Answer:

    i) Variable oxidation states e.g. 25Mn ⇒ +2, +3, +4, +6, +7

    ii) Formation of complex ions e.g. [Cu(NH3)4]2+

    iii) Formation of coloured compounds e.g. Ni2+ ⇒ Green

    iv) Catalytic activity e.g. Nickel in the production of Ethane from ethane

     

    (c) Which of the following metals belongs to the first transition Series? Chromium, Lead, Sodium, Manganese, Aluminium.

    Answer:  Chromium and Manganese

     

    2(a) Explain why transition metals have variable oxidation states

    Answer:  Transition metals exhibit variable oxidation states because the 4s electrons are available for bond formation

     

    (b) Give the reason why Zinc, 30Zn does not exhibit the characteristics properties of transition Elements.

    Answer:  Zinc does not exhibit characteristic properties of transition elements because it doesn’t have a partially filled d-orbital but completely filled d-orbital.

     

    3(a) The Oxidation number of Copper in its compounds is either +1 or +2. Give the name and formula of a compound in which Copper has

    (i) +1 Oxidation State

    Answer: Cuprous chloride ⇒ CuCl

    (ii) +2 Oxidation State

    Answer:  +2 oxidation state ⇒ [Cu (NH3)4]2+

     

    (b)(i) What is a Complex Ion

    Answer: A complex ion consists of a central metal cation to which several anions or molecules called ligands are bonded.

     

    (ii) Name two metals that form Complex ions, giving an example in each case   

    Answer:

    Copper Cu e.g. [Cu(NH3)4]2+

    Iron Fe e.g. [Fe(CN)6]3-

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