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    Hi, I have an exam question...

    An unknown element is burnt in the air and the product is collected and dissolved in water, which gives an acidic solution. The element as a solid is a good conductor of electricity. Suggest the identity of the element.

    Is it a metal? But a specific one? Any help will be greatly appreciated!
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    Well, what you're looking for is something that, when burnt in the air (oxygen) produces a gas that when bubbled through water makes it acidic. Then, this element also has to be a good conductor of electricity.

    I'll give you a clue to start you off, then you see if you can work out the rest.

    The clue is 'thermal decomposition'.
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    (Original post by GetOverHere)
    Well, what you're looking for is something that, when burnt in the air (oxygen) produces a gas that when bubbled through water makes it acidic. Then, this element also has to be a good conductor of electricity.

    I'll give you a clue to start you off, then you see if you can work out the rest.

    The clue is 'thermal decomposition'.
    Ok, so oxygen and therefore probably an oxide/hydroxide. Only it can't be an oxide because that's a base. So hydroxide and copper (for example) is a good conductor of electricity. Copper hydroxide?
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    (Original post by DragonQueen)
    Ok, so oxygen and therefore probably an oxide/hydroxide. Only it can't be an oxide because that's a base. So hydroxide and copper (for example) is a good conductor of electricity. Copper hydroxide?
    Hydroxides are alkali
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    (Original post by ScienceFantatic)
    Hydroxides are alkali
    It has to be a metal though, right?
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    (Original post by DragonQueen)
    It has to be a metal though, right?
    In this case, it probably isn't.
    Metal oxides and hydroxides are all generally quite basic/alkaline.

    Which elements, that are not metals, conduct electricity?
    I'll give you a clue, there are only a couple.
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    (Original post by Firstservingman)
    In this case, it probably isn't.
    Metal oxides and hydroxides are all generally quite basic/alkaline.

    Which elements, that are not metals, conduct electricity?
    I'll give you a clue, there are only a couple.
    Carbon, as graphite does. So do the halogens...
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    It most like graphite but could also be a metaloid like arsenic but its not a good conductor of electricity so I think its graphite..
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    Ok, thank so much for all the help!!!
 
 
 
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