Zadanie 1c
Wzorowane na: Chemistry HL Paper 3, November 2024, pytanie 1(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 1a-1c.
Tributyltin (TBT) compounds were once used in antifouling paints for ships. In harbour water, TBT is present as tributyltin ions, (C4H9)3Sn+, which are absorbed by marine animals, then slowly metabolized and excreted.
Polecenie
Suggest two variables that should be controlled when mussels are collected and their soft tissue is sampled.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
any two of:
species / size / mass / length / age of the mussels ✔
time spent in the harbour ✔
position / depth in the harbour where the mussels were kept ✔
temperature of the water ✔
water content of the tissue sampled ✔
part of the mussel the tissue is taken from ✔
method used to extract the tin from the tissue ✔
Schemat punktowania
[1] for each variable, maximum [2]. Do not accept 'mass of the tissue sample' alone, 'the same mussels' alone or 'pH'.