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SS2: CHEMISTRY - 3RD TERM

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  1. Hydrogen and its Compounds
    7 Topics
    |
    1 Quiz
  2. Oxygen and its Compounds
    7 Topics
    |
    1 Quiz
  3. Halogens, Chlorine and its Compounds
    7 Topics
    |
    1 Quiz
  4. Hydrogen Chloride and Hydrochloric Acid
    5 Topics
    |
    1 Quiz
  5. Nitrogen and Its Compounds
    9 Topics
    |
    1 Quiz
  6. Ammonia
    9 Topics
    |
    1 Quiz
  7. Sulphur and its Compounds
    13 Topics
    |
    1 Quiz
  8. Hydrocarbons
    12 Topics
    |
    1 Quiz
  9. Alkanols
    4 Topics
    |
    1 Quiz
  • excellence
Lesson 2, Topic 6
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Binary Compounds of Oxygen: Oxides

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Topic Content:

  • Acidic Oxides
  • Basic Oxides
  • Amphoteric Oxides
  • Neutral Oxides
  • Peroxides
  • Higher Oxides

Oxides are binary compounds of oxygen with another element. Examples of oxides are CO2 , SO2 , CaO, CO, ZnO, BaO2 , and H2 O. Based on their acid-base characteristics oxides are classified as acidic, basic, amphoteric, or neutral.

Acidic Oxides:

Acidic oxides are oxides of non-metals. They are also called acid anhydrides. Acidic oxides dissolve in water to give acidic solutions. CO2(g) , SO2(g) , and NO2(g) are examples of acidic oxides.

 

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\( \scriptsize SO_{2(g)} + H_2O_{(l)} \large \rightarrow \scriptsize \underset {Trioxosulphate (IV)\: acid}{H_2SO_{3(aq)}} \)

\( \scriptsize CO_{2(g)} + H_2O_{(l)} \large\rightarrow\scriptsize \underset {Trioxocarbonate (IV)\: acid}{H_2CO_{3(aq)}} \)

\( \scriptsize NO_{2(g)} + H_2O_{(l)} \large \rightarrow \scriptsize \underset {Trioxonitrate (V)\: acid}{HNO_{3(aq)}} \)

Basic Oxides:

Generally, the alkali metals and the alkaline earth metals form basic oxides with oxygen. The soluble basic oxides, also called basic anhydrides, react with water to produce hydroxides (alkalis) For example, potassium oxide and sodium oxide will each react with water to produce potassium hydroxide and sodium hydroxide respectively as shown in the equation below.

K2 O(s) + H2 O(l) → 2KOH(aq)

Na2 O(s) 

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