Zadanie 1b
Wzorowane na: Chemistry SL Paper 2, November 2023, TZ1, pytanie 1(b). 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-1d.
Ethanoic acid, CH3COOH, belongs to the homologous series of carboxylic acids, in which it is the second member.
Polecenie
Draw a Lewis (electron dot) formula for a molecule of ethanoic acid, showing every bonding and non-bonding electron pair.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
correct Lewis structure of ethanoic acid ✔
«the two carbon atoms are joined by one shared pair; the methyl carbon carries three hydrogen atoms, each joined by one shared pair; the carbonyl carbon is joined by two shared pairs to one oxygen atom, which also has two lone pairs; the carbonyl carbon is joined by one shared pair to the second oxygen atom, which has two lone pairs and is joined by one shared pair to the last hydrogen atom»
Schemat punktowania
[1] for a structure that shows every bonding pair and every lone pair (24 valence electrons in total) with the C=O double bond and the O–H bond in the right places. Accept any combination of lines, dots and crosses to represent electron pairs. Do not award the mark if lone pairs on oxygen are missing or if the oxygen atom of the hydroxyl group is bonded to the wrong carbon.