Wzorowane na: Chemistry HL Paper 1B, May 2025, TZ2, pytanie 3(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Informacja do zadań 3a-3c.
The reaction between powdered calcium carbonate,
The results were plotted on the graph.
If the reaction with 0.80 went to completion, the theoretical mass of released would be 1.76 g.
(i) Use the graph to determine the mass, in g, of actually released in this reaction.
(ii) Calculate the percentage difference between the actual mass of and the theoretical mass, relative to the theoretical mass.
(iii) The same mass of and the same volume of
(i) «104.6 − 103.2 =» 1.4 «g» ✔
(ii) «» 20 «%» ✔
(iii) Any one of:
the data logger was started after the solid had been added, so some had already escaped/the delay before recording differed between runs ✔
the balance was not tared/zeroed in the same way before each run ✔
different flasks «with slightly different masses» were used ✔
the flask was wet/not cleaned between runs ✔
not all of the solid or acid was transferred to the flask ✔
the volume of acid was measured with a measuring cylinder «so it varied slightly» ✔
the balance drifted/was recalibrated between runs ✔
(i) [1] for 1.3 to 1.5 g. (ii) [1]; ECF from (i): 1.3 g gives 26 %, 1.5 g gives 15 %; accept 20 % or 20.5 %. (iii) [1], list principle.
The percentage difference is taken relative to the theoretical value; the missing mass is CO2 that dissolved in the solution or escaped before logging started.
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