When a piece of copper foil is heated by a Bunsen flame, the foil
A. does not burn but turns black
B. does not burn but turns brown
C. burns with a green flame and a grey powder is formed
D. burns with an orange flame and a grey powder is formed
Chem mc 一題
2007-05-30 2:50 am
回答 (1)
2007-05-30 4:06 am
✔ 最佳答案
The answer is A.The reactivity of copper is low, and thus copper does not burn in air.
When copper is heated in air, the copper becomes red hot but does not burn. Copper is changed to black copper(II) oxide. The equation is:
2Cu(s) + O2(g) → 2CuO(s)
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