Exothermic and endothermic reactions

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Question 14
Medium

Zinc reacts with copper(II) sulfate solution in an exothermic reaction.

The equation for the reaction is:

Zn(s)+CuSO4(aq)→ZnSO4(aq)+Cu(s) \text{Zn(s)} + \text{CuSO}_4(\text{aq}) \rightarrow \text{ZnSO}_4(\text{aq}) + \text{Cu(s)} Zn(s)+CuSO4​(aq)→ZnSO4​(aq)+Cu(s)

A student investigated the effect of changing the mass of zinc powder on the highest temperature reached by the reaction mixture.

Figure 1

a.

Determine the gradient of the line of best fit in Figure 1. Use the equation:

Gradient=Change in highest temperatureChange in mass \text{Gradient} = \frac{\text{Change in highest temperature}}{\text{Change in mass}} Gradient=Change in massChange in highest temperature​

Give the unit.

[3]
b.

The initial temperature of the reaction mixture is where the line of best fit would meet the yyy-axis. Determine the initial temperature of the reaction mixture by extrapolating the line of best fit to a mass of 0.0 g.

[2]

Exothermic and endothermic reactions Questions

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