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A student investigated the effect of changing acid concentration on reaction rate - Scottish Highers Chemistry - Question 2 - 2015
Question 2
A student investigated the effect of changing acid concentration on reaction rate. Identical strips of magnesium ribbon were dropped into different concentrations of... show full transcript
Worked Solution & Example Answer:A student investigated the effect of changing acid concentration on reaction rate - Scottish Highers Chemistry - Question 2 - 2015
Step 1
Use information from the graph to calculate the reaction time
Answer
From the graph, the rate is determined to be 0.022 s⁻¹. Thus, the time taken for the reaction can be calculated using the formula: t = 1/rate = 1/0.022 = 45.45 seconds. Therefore, the reaction time is approximately 45 seconds.
Step 2
Add a second curve to graph 1 to show the distribution of kinetic energies at 50°C
Answer
The second line should be drawn to the left of the original curve, indicating a decrease in kinetic energy distribution at a lower temperature of 50°C. The peak of the curve should appear lower than that of the original distribution at 100°C.
Step 3