Zadanie 30
Wzorowane na: Chemistry SL Paper 1, November 2024, pytanie 30. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A student determines the concentration of a solution of hydrochloric acid by titration. The same titration is repeated five times, and the titres are scattered both above and below the mean, because the student finds it difficult to judge the exact point at which the indicator changes colour.
Which type of error is most likely to occur, and how does it affect the quality of the data?
A. Systematic error and lower accuracy
B. Systematic error and lower precision
C. Random error and lower precision
D. Random error and lower accuracy
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
C ✔
«values scattered unpredictably about the mean show a random error, which reduces the precision (the agreement between repeated measurements); a systematic error would shift all the values in the same direction»
Schemat punktowania
One mark for the correct option.