Question

1) Using the data below, create two simple line graphs on a separate sheet of paper that will help you to determine the type of reaction. Your graphs should have the independent variable on the y-axis (temperature) and the dependent variable on the x-axis (time). Because we did not measure the time in the same intervals, you should do two separate graphs rather than a combined one. You must determine the correct spacing for your axis and the scale. Make sure that the graphs are labeled correctly and are titled.

2) How can you tell from your graphs which reaction was endothermic and which one was exothermic?

Answer 1

The thiosulfate reaction is endothermic while the sodium hydroxide reaction is exothermic.

What is an endothermic reaction?

An endothermic reaction is one in which the temperature decreases as time increases while an exothermic reaction is one in which the temperature increases as time increases.

We can see that the reaction involving the thiosulfate is an endothermic reaction because the temperature was decreased as time increased while the reaction involving the sodium hydroxide is an exothermic reaction because the temperature increased as time increased.

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