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Posted by on Wednesday, September 23, 2009 at 2:14am.

When an element is burnt in excess oxygen, is the oxide formed always:

1. a crystalline solid
2. greater in mass than the element
3. soluble in water
4. white in color

alright, i know that most oxides are not soluble in water other than group 1 elements and calcium and barium. (correct me if i'm wrong) And not all oxides are white in color. So, what about option 1 and 2? The correct answer is 2, but i don't get it, why must the oxide formed be heavier than the element?? And what kind of oxide isn't a crystalline solid?

Help, thanks!

  • Chem - oxides - , Wednesday, September 23, 2009 at 10:56am

    The oxide must have a greater mass than the element as O atoms have been added. Thus CuO must have a great mass than Cu.

    For 1. I suspect that they are thinking of room temperature and pressure. Thus CO2 is a gas, H2O is a liquid.

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