Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.
Baza zadań
Wybierz umiejętność, rok lub poziom trudności. Każde zadanie ma klucz i schemat punktowania.
Pokazujemy tylko poziomy, dla których mamy zadania.
Znaleziono 1061 zadań
Which row correctly describes a weak Brønsted–Lowry acid? A. Ionizes only partially; its conjugate base is relatively strong B. Ionizes almost completely; its conjugate base is relatively strong C. Ionizes almost completely; its conjugate base is very weak D.…
What is the hydroxide ion concentration, in mol dm−3, of a solution with pH = 9.0 at 298 K? A. 1.0 × 10−9 B. 1.0 × 10−5 C. 1.0 × 105 D. 1.0 × 10−14
Which change involves the oxidation of chlorine? A. Cl2 → Cl− B. ClO4− → ClO3− C. Cl2 → ClO3− D. HCl → Cl−
Which element has more than one oxidation state in its compounds? A. Sodium B. Magnesium C. Fluorine D. Sulfur
What is the formula of iron(III) sulfide? A. FeS B. Fe3S2 C. Fe2(SO4)3 D. Fe2S3
Which statement describes a voltaic cell? A. It converts electrical energy to chemical energy using a spontaneous redox reaction B. It converts chemical energy to electrical energy using a non-spontaneous redox reaction C. It converts electrical energy to…
Which row describes an electrolytic cell? A. The anode is positive; the overall reaction is non-spontaneous B. The anode is negative; the overall reaction is spontaneous C. The anode is negative; the overall reaction is non-spontaneous D. The anode is…
Which species could be reduced to form elemental sulfur, S? A. H2S B. ZnS C. SO2 D. CS2
Which formula represents an ester? A. CH3CH2OCH2CH3 B. CH3COOCH2CH3 C. CH3CH2CONH2 D. CH3CH2COOH
Which compound is an aromatic ester? A. Compound A B. Compound B C. Compound C D. Compound D