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SS2: CHEMISTRY - 3RD TERM

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  1. Hydrogen and its Compounds | Week 1
    7 Topics
    |
    1 Quiz
  2. Oxygen and its Compounds | Week 2
    7 Topics
    |
    1 Quiz
  3. Halogens, Chlorine and its Compounds | Week 3
    7 Topics
    |
    1 Quiz
  4. Hydrogen Chloride and Hydrochloric Acid | Week 4
    5 Topics
    |
    1 Quiz
  5. Nitrogen and Its Compounds | Week 5
    9 Topics
    |
    1 Quiz
  6. Ammonia | Week 6
    9 Topics
    |
    1 Quiz
  7. Sulphur and its Compounds | Week 7
    13 Topics
    |
    1 Quiz
  8. Hydrocarbons | Week 8
    12 Topics
    |
    1 Quiz
  9. Alkanols | Week 9
    4 Topics
    |
    1 Quiz

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Topic Content:

  • Theory Questions & Answers – Oxygen and its Compounds

Theory Questions & Answers – Oxygen and its Compounds:

1. (a) Give the electronic configuration of oxygen.

(b) Give the oxidation state of oxygen in each of the following compounds.

i. MgO ii.  CaO iii. Na2O2 iv. H2O

2. (a) Describe the industrial preparation of oxygen.

(b) Describe one laboratory preparation of oxygen

3. (a) Test for oxygen in the Laboratory

(b) State three uses of oxygen

4. (a) State three chemical properties of oxygen.

(b) List four types of oxides, giving an example in each case.

 

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Theory Questions & Answers

1. (a) Give the electronic configuration of oxygen.

Answer: 8O = 1s2, 2s2, 2p4.

 

(b) Give the oxidation state of oxygen in each of the following compounds.

i. MgO

Answer:  = -2

ii.  CaO

Answer:   = -2

iii. Na2O2

Answer:   = -4

iv. H2O

Answer  = -2

 

2. (a) Describe the industrial preparation of oxygen.

Answer:

  • Air is collated and filtered to remove dust
  • Air is cooled to a temperature of 200°C to form liquid water vapour condenses and removed
  • CO2 is removed at about 79°C
  • The liquid air is passed into a fractionating column
  • Nitrogen, Oxygen, and Argon are removed at a temperature of -196°C and argon at -183°C while oxygen boils out at -183°C and is collected as liquid.
  • It is then compressed and stored in a strong steel cylinder under the pressure of 100 atm.

 

b. Describe one laboratory preparation of oxygen.

Answer:

From hydrogen peroxide H2O2(l)

2H2O2(l) →  2H2O(l) + O2(g)

 

3. (a) Test for oxygen in the Laboratory

Answer: A glowing splint reignites when inserted into the gas.

 

(b) State three uses of oxygen

Answer:

  • It is used in medicine
  • It is used in welding
  • It is essential for respiration

 

4. (a) State three chemical properties of oxygen.

Answer:

– It reacts with metals

e.g. 4K(s) + O2(g)   → 2K2O(s)

 

– It reacts with non-metals

e.g. S2 + 2O2  → 2SO2

 

– It reacts with hydrogen to form water

e.g.  2H2 + O2 → 2H2O

 

(b) List four types of oxides, giving an example in each case.

Answer:

Four types of oxygen

Acidic oxides →   H2SO3

Basic oxide →  KOH

Neutral oxide →  CO

Peroxides →  H2O2

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