Graphical techniques questions

Assignment: Graphical techniques short answer questions

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Sketch three separate graphs to show how the concentration of reactant A varies with time for :
(a) a zero order reaction with respect to [A].
(b) a first order reaction with respect to [A].
(c) a second order reaction with respect to [A].

10 lines
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The ideal gas equation is PV = nRT.
(a) Sketch a graph to show how pressure changes with volume for a fixed mass of gas at a constant temperature.
(b) Show how the variables can be manipulated to produce a straight- line graph.

10 lines
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The absorbance of a solution containing an unknown concentration of iron(III) thiocyanate was measured with a visible spectrometer and found to be 0.036. Use the calibration curve below, which was obtained using known concentrations of iron(III) thiocyanate under the same conditions, to determine the concentration of iron(III) thiocyanate (in ppm) in the sample.

3 lines
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A student wanted to determine the value for the temperature of absolute zero in oC by experiment. She took 100 cm3 of methane measured at 1.00 x 105 Pa and 20 oC. She then successively increased the temperature by 10 oC and measured the new volume at 30 oC, 40 oC, 50 oC, 60 oC, 70 oC and 80 oC whilst keeping the pressure constant. Explain how she could use her results graphically to determine the value for absolute zero.

10 lines
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