In several reactions a colour change indicates the formation of new products. For example, green copper carbonate reacts, when heated, to form black copper oxide and carbon dioxide gas.
Photopromoted carbonylation of chloroalkanes with carbon monoxide and carbon dioxide was catalyzed by copper salts and carried out under mild conditions.
研究了光促进温和条件下，非贵金属铜盐催化氯代烷烃的羰基化反应。
3
This paper describes a method of ion flotation for separating cobalt, nickel and copper from a solution of manganese ore leached with sulphur dioxide.