Zadanie 5f
Wzorowane na: Chemistry HL Paper 2, November 2022, pytanie 5(f). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 5a-5f.
Coal is burned in power stations to generate electricity. Coal contains small amounts of sulfur.
Polecenie
PF3Cl2 can form isomers, some of which are polar and one of which is non-polar. Deduce the three-dimensional arrangement of one non-polar isomer and of one polar isomer of PF3Cl2 by stating the positions, axial or equatorial, of the two chlorine atoms. In a trigonal bipyramid the two axial positions lie on the 180° axis through the central atom and the three equatorial positions lie in the plane perpendicular to that axis.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Non-polar isomer: trigonal bipyramidal molecule with both chlorine atoms axial «180° apart» and the three fluorine atoms equatorial ✔
Polar isomer: trigonal bipyramidal molecule with both chlorine atoms equatorial «two fluorine atoms axial»
OR
one chlorine atom axial and one equatorial ✔
Schemat punktowania
M1: non-polar isomer (both Cl axial, dipoles cancel); M2: a polar isomer. Accept other clear representations of the three-dimensional structure, such as wedge and dash drawings.
Komentarz
Phosphorus has five electron domains, so the shape is trigonal bipyramidal, not octahedral.