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Balance copper turning black in air.

Exercise and reference answers

Left
  1. Coefficient
    2
    Formula
    Cu
  2. Coefficient
    1
    Formula
    O₂
Right
  1. Coefficient
    2
    Formula
    CuO
Instructions
Heated copper forms black CuO.

Explanation

_Source: syllabus Science, Ch 3 'Metals and Non-Metals' §3.2.1_
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