The vinegar mixture causes a chemical reaction between the copper and the air known as a redox reaction. Is the resulting colour change different with this acid?.Instead of ethanoic acid try using citric acid (2-hydroxypropane-1,2,3-tricarboxylic acid). Is this a chemical or physical reaction?.Describe the appearance of the copper coins.Why are the coins separated into two different groups?.Leave them for around 1–2 hours or left in a safe place for next lesson.Take the paper towel with the other three coins on and mark this B. ![]()
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