Zadanie 29
Wzorowane na: Chemistry SL Paper 1, May 2023, TZ1, pytanie 29. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Which source of error would be reduced by repeating the measurement and calculating the mean of the results?
A. A balance reads 0.05 g too high for every object placed on it
B. The student's judgement of the moment at which a cross disappears differs from trial to trial
C. A pipette always delivers 0.2 cm3 less than the volume marked on it
D. A thermometer was incorrectly calibrated and reads 1 °C too high at every temperature
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
B ✔
«a random error, such as a varying judgement of an end point, changes the result by a different amount in each trial, so the errors partly cancel in the mean; the other three are systematic errors that shift every reading by the same amount and are not removed by repeating»
Schemat punktowania
One mark for the correct option.