Chemistry · Oct / Nov 2025 · Paper 61 · Question 4

When a solid metal is added to an aqueous salt of a less reactive metal, a reaction takes place. The reaction is exothermic, and the temperature of the reaction mixture increases. The larger the difference in reactivity of the two metals, the more exothermic the reaction. Cobalt, manganese and nickel are three metals which are all more reactive than copper and react with aqueous copper(II) sulfate. The temperature of the reaction mixture increases during each reaction. Plan an investigation to find the order of reactivity of the three metals cobalt, manganese and nickel. Your plan should include how you can use the results to find the order of reactivity of the three metals cobalt, manganese and nickel. You are provided with powdered samples of cobalt, manganese and nickel, aqueous copper(II) sulfate and common laboratory apparatus. [6]

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