An unknown yellow material in the laboratory was heated. When heated, the material melted and turned light brown. The material cooled off and upon cooling, it turned back to yellow color. What could be the nature of the material?
A. elements C. mixture
B. compound D. cannot be determined
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Answer:
D. Cannot be determined
I think it is D because elements are substances that are made up of one type of atom while Compounds are substances made from atoms of different elements joined by chemical bonds and a mixture is made by simply mixing together elements and compounds.