Oxides

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  • umba166 - that's hardly a fair comment. How about you make sure YOUR work is accurate by cross referencing it with other sources?
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  • @jazzyimhere if the oxide can only react with acids, it is a basic oxide.
    if the oxide can only react with alkalis, it is a acidic oxide
    if the oxide can both react with acids and alkalis, it is an amphoteric oxide.
    if the oxide does not show basic or acidic properties, it is a neutral oxide
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  • i dont understand. How can some oxides dissolve in acid? I am not sure what it means...I am confused..:(
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  • I use slide share for some of my notes so make sure your work is accurate
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  • Hi, i think there is a mistake. NO (nitric oxide) is an acidic oxide. In water, NO reacts with oxygen and water to form HNO2 or nitrous acid. The reaction is thought to proceed via the following stoichiometry:
    4 NO + O2 + 2 H2O → 4 HNO2
    Source: Wiki. (unable to find a better source though)

    I think you mean N2O instead, as a neutral oxide.
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Oxides

  1. 1. Acid and Bases -Types of Oxides- Many acids and alkali are formed by dissolving oxides in water
  2. 2. At the end of this e-learning, you should able to: <ul><li>Classify oxides as acidic, basic, amphoteric or neutral based on metallic/non-metallic character </li></ul>
  3. 3. What is an oxide? <ul><li>An oxide is a compound of oxygen and another element. </li></ul><ul><li>Most oxides can be grouped into four types: </li></ul><ul><ul><li>acidic oxides </li></ul></ul><ul><ul><li>basic oxides </li></ul></ul><ul><ul><li>amphoteric oxides </li></ul></ul><ul><ul><li>neutral oxides </li></ul></ul>
  4. 4. Acidic oxides <ul><li>Oxides of non-metal </li></ul><ul><li>Acidic oxides are often gases at room temperature. </li></ul>
  5. 5. Acidic oxides <ul><li>React with water to produce acids . </li></ul><ul><ul><li>Example: </li></ul></ul><ul><ul><li>sulphur trioxide + water sulphuric acid </li></ul></ul>SO 3 + H 2 O H 2 SO 4
  6. 6. Acidic oxides <ul><li>React with bases and alkalis to produce salts </li></ul><ul><ul><li>Example: </li></ul></ul><ul><ul><li>carbon dioxide + sodium hydroxide sodium carbonate + water </li></ul></ul>CO 2 + 2NaOH Na 2 CO 3 + H 2 O
  7. 7. Examples of acidic oxides phosphoric acid, H 3 PO 4 P 4 O 10 phosphorous(V) oxide CO 2 SO 2 SO 3 Formula carbonic acid, H 2 CO 3 sulphurous acid, H 2 SO 3 sulphuric acid, H 2 SO 4 Acid Produced with Water carbon dioxide sulphur dioxide sulphur trioxide Acidic Oxide
  8. 8. Basic oxides <ul><li>Oxides of metal </li></ul><ul><li>Basic oxides are often solids at room temperature. </li></ul><ul><li>Most basic oxides are </li></ul><ul><li>insoluble in water. </li></ul>Calcium oxide (quicklime)
  9. 9. Basic oxides <ul><li>React with acids to produce salts and water only. </li></ul><ul><ul><li>Example: </li></ul></ul><ul><ul><li>Magnesium oxide + hydrochloric acid magnesium chloride + water </li></ul></ul>MgO + 2HC l MgC l 2 + H 2 O This is a neutralisation reaction
  10. 10. Examples of basic oxides CuO copper(II) oxide CaO Na 2 O MgO Formula calcium oxide sodium oxide magnesium oxide Basic Oxide
  11. 11. Amphoteric oxides <ul><li>Oxides of metal </li></ul><ul><li>Can behave as acidic oxides </li></ul><ul><li>or as basic oxides </li></ul>Zinc oxide
  12. 12. Amphoteric oxides <ul><li>React with acids and alkalis to produce salts </li></ul><ul><ul><li>Example: aluminium oxide (A l 2O3) </li></ul></ul><ul><ul><ul><li>aluminium oxide as a base </li></ul></ul></ul><ul><ul><ul><li>aluminium oxide as an acid </li></ul></ul></ul>hydrochloric acid aluminium chloride water aluminium oxide + + aluminium oxide sodium hydroxide sodium aluminate water + +
  13. 13. Neutral oxides <ul><li>Non-metals that form oxides that show neither basic nor acidic properties. </li></ul><ul><li>Insoluble in water. </li></ul>
  14. 14. Examples of neutral oxides NO CO H 2 O Formula nitric oxide carbon monoxide water Neutral Oxide
  15. 15. How can we classify an unknown oxide? <ul><li>First question: </li></ul><ul><li>Does the oxide dissolve in acid? </li></ul>YES NO
  16. 16. It is either a basic or amphoteric oxide. <ul><li>Next question: </li></ul><ul><li>Is the oxide soluble in alkali? </li></ul>Soluble Insoluble
  17. 17. It is either an acidic or neutral oxide. <ul><li>Next question: </li></ul><ul><li>Is the oxide soluble in alkali? </li></ul>Soluble Insoluble
  18. 18. Amphoteric oxide What is an amphoteric oxide? Back to first question
  19. 19. Basic oxide What is a basic oxide? Cook an egg with calcium oxide Back to first question
  20. 20. Acidic oxide What is an acidic oxide? How does acidic oxide affects the atmosphere? Back to first question
  21. 21. Neutral oxide What is an neutral oxide? Back to first question Back to the first slide

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