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24.03.2020 •
Chemistry
Pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons
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Ответ:
I'd say it is an element. It is not a compound, it doesn't do things on its own like us. It's an element like fire and water.
Ответ:
d= 5 / 4.5