匿名
匿名 發問於 科學及數學化學 · 6 年前

combustion and burning

I learn that combustion is a gas-phase reaction.

But someone told me that burning is a type of combustion

According to this, burning is also a gas-phase reaction

But as I read my textbook, when solid potassium metal burns in air, lilac flames show up;

This experiment shows that burning is not necessary a gas-phase reaction.

I am confused about the difference between combustion and burning. Please tell me about it. Also explain more on gas-phase reactions

Thanks a lot!

更新:

Thanks for your help.

It seems that I did not think clearly. A silly logical mistake!!!><

But can you tell me whether burning is a gas-phase reaction?

Still, I did not understand thoroughly about gas-phase reaction.

Are all reactions involving gases gas-phase reactions?

更新 2:

Also, I can't see why the reaction between carbon and oxygen (from your example of solid reacting with gas) is a gas-phase reaction because carbon is a solid....... >

2 個解答

評分
  • Jenkin
    Lv 7
    6 年前
    最愛解答

    I think you have a fundamental misconception in "logic" or meanings of English.

    Burning is "a form" of combustion means there are many types of "Combustion" and buring is only one type of combusion.

    "Combustion" is a gas-reaction is a physical description of a process. It is not to define the "materials of the combustion.

    It is true that combustion is gas-reaction...but the source of the "gas" or gaseous reaction can be:

    solid reaction with gas - wood burning is a combustion of reaction of wood(carbon) with air (oxygen) to form CO2 (gas) and heat.

    gas reaction with gas - natural/town gas burning on stove is CH4 + O2 = CO2 + heat!

    liquid reaction wtih gas - oil burning is vaporization of the oil and react with air (oxygen)...

    All these are combustions: gas-phase reaction means the "micro" process of the combustion is reaction between the air(gas) with the gasous molecule of the "material" burning.

    Of course this is a simplified expanation, not a text book definition. But from a simple sense, burning is what you can see; combustion may refers to the molecular level of the reaction.

  • fooks
    Lv 7
    6 年前

    The burning of potassium occurs in the gas phase. Note that the flame is above the potassium (i.e. gas phase), and the lilac colour of the flame is caused by the gaseous potassium ions.

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