Question by Jena: In which classification of matter does the green powder belong?
A light green powder is heated in a test tube. A gas is given off, and the solid becomes black. In which classification of matter does the green powder belong? Explain your reasoning.
Best answer:
Answer by Max G
The green powder is a CARBONATE.
More precisely it is copper (II) carbonate, which is greenish in colour. It thermally decomposes as follows:
CuCO3 (s) ——-> CuO (s) + CO2 (g)
The gas given off is carbon dioxide, while the copper (II) oxide produced has in fact a black colouration.
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