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Copper oxide and zinc reaction

Copper oxide and zinc reaction

A500/0682

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Credit

DAVID TAYLOR / SCIENCE PHOTO LIBRARY DAVID TAYLOR / SCIENCE PHOTO LIBRARY

Caption

Copper oxide and zinc, undergoing an exothermic displacement reaction. The reaction is self- perpetuating after being initially lit, since it provides its own heat energy needed for the reaction to continue. Reactions that give off heat are known as exothermic. A displacement reaction is when an element is displaced from its compound (copper oxide, CuO) by a more reactive element (zinc, Zn), to produce the element in its pure form (copper metal, Cu) and a new compound (zinc oxide, ZnO). The zinc oxide is seen as a yellow powder (centre, left) which turns white when cool.

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