試題詳解

12. The copper oxide (CuO) and carbon powder are fully mixed and heated to produce red metal and gas. Which of the following statements is correct?
(A) the gas is CO₂
(B) the red metal is copper carbide
(C) this experiment shows that copper is more active than carbon
(D)pour the gas into the water, it can be detected by the pH test strips to be alkaline.