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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 – Periodicity and Periodic Properties III

Theory Questions – Periodicity and Periodic Properties III

1. Consider the following elements  6C, 11Na, 12Mg, 15P, 16S, 17Cl, 18Ne

State which of these can:

(a) Form hybrids by electrovalent bonding

(b) Be used to catalyse a chemical reaction

(c) Be used in radioactive dating

(d) Form an acid anhydride

(e) Exhibit both metallic and non-metallic behaviour.

2. (a) How many groups are in the periodic table?

(b) In terms of electronic structure, state what is common to all the elements in the same (i) Group  (ii) period

3. Write briefly on the characteristics of:

(a) Alkali metals

(b) Alkaline earth metals

(c) Halogens

(d) Transition metals

4. (a) Halogens are referred to as salt producers? Explain:

(b) Give five uses of noble gas 

(c) State the period and the group to which each of the following elements belong! 4V, 13W, 2X, 20Y, 10Z. 

15P

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Evaluation Questions

    1. Consider the following elements  6C, 11Na, 12Mg, 15P, 16S, 17Cl, 18Ne

    State which of these can:

    (a) Form hybrids by electrovalent bonding

    Answer: 11N, 12Mg

     

    (b) Be used to catalyse a chemical reaction

    15P

     

    (c) Be used in radioactive dating

    Answer:  18Ne

    (d) Form an acid anhydride

    Answer: 16S

     

    (e) Exhibit both metallic and non-metallic behaviour.

    Answer: 6C

     

    2. (a) How many groups are in the periodic table?

    Answer: There are 8 groups in the periodic table

     

    (b) In terms of electronic structure, state what is common to all the elements in the same

    (i) Group 

    Answer:  The same number of valence electrons (i.e. electrons in the outermost shell)

    (ii) Period

    Answer: They have the same number of electron shells

     

    3. Write briefly on the characteristics of 

    (a) Alkali metals

    Answer:

    • They are group 1 elements
    • They are the most reactive metals
    • They are univalent elements
    • They are strong reducing agents
    • They are good conductors of electricity
    • They react with cold water to liberate hydrogen gas and form alkalis
    • Their trioxonitrate (V) salt decomposes on heat to give dioxonitrate (III) salts and oxygen.

     

    (b) Alkaline earth metals

    Answer:

    • They are group 2 Elements
    • They are the second most reactive group of metals
    • They are divalent elements
    • They are electron donors and form electrovalent bonds
    • They are strong reducing agents and also good conductors of electricity

     

    (c) Halogens

    Answer:

    • Most reactive non-metals
    • They are diatomic molecules
    • They ionize to form univalent negative ions
    • They have high electronegativity and are electron acceptor
    • They are strong oxidizing agents

     

    (d) Transition metals

    Answer:

    • They are found in between group II and III
    • They contain partially filled d-orbitals

     

    4. (a) Halogens are referred to as salt producers, Explain

    Answer:

    Halogens are derived from the Greek words hal (-‘salt’) and –gen (‘to produce’) because they produce sodium salts of similar properties of which sodium chloride table salt or halite is renowned.

     

    (b) Give five uses of noble gas 

    Answer:

    • Argon is used in gas-filled electric bulbs
    • Helium is used in filling balloons
    • Radon is a radioactive element. Radiation is used as medicine for the treatment of cancer.
    • A mixture of krypton and xenon is used in the photographer’s flash tube.
    • Mixtures of helium and oxygen are used by divers.

     

     (c) State the period and the group to which each of the following elements belongs!

    4V, 13W, 2X, 20Y, 10Z. 

    Answer:

    4V → Group II, period II

    13W → Group III, period III

    2X → Group VIII (8 or 0), period I

    20Y → Group II, period IV

    10Z → Group VIII (8 or 0), period II

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