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 1476 zadań
The sample produces the following mass spectrum. (i) Explain why the three peaks around m/z 72 have different relative heights. (ii) From the sample, calculate the relative atomic mass of chlorine, giving your answer to two decimal places.
(i) Using sections 9 and 17 of the data booklet, and showing your working, deduce the type of bonding present in magnesium chloride, MgCl2, and its percentage covalent character. (ii) Assuming purely ionic bonding, and using sections 9 and 12 of the…
Anhydrous nickel(II) chloride is yellow, whereas magnesium chloride is white. (i) State nickel's condensed electron configuration. (ii) In terms of electron configuration, state why nickel(II) chloride is a coloured compound. (iii) Nickel(II) chloride absorbs…
A steel object is electroplated with nickel, using an aqueous nickel(II) chloride electrolyte. (i) Deduce the half-equation for the reaction occurring at each electrode. Anode: Cathode: (ii) For the reaction between chlorine gas and aqueous potassium iodide…
Part of the lattice of potassium bromide, KBr, is shown in an expanded view. Which statement about the lattice of potassium bromide is correct? A. Each bromide ion is in contact with six potassium ions. B. Neighbouring ions are held together by shared pairs of…
Which row correctly gives the electron domain geometry and the molecular geometry of sulfur dichloride, SCl2? A. Trigonal planar electron domain geometry; bent molecular geometry B. Linear electron domain geometry; linear molecular geometry C.…
What are the electron domain geometry and the molecular geometry of the BrF4− ion? A. Electron domain geometry: tetrahedral; molecular geometry: tetrahedral B. Electron domain geometry: trigonal bipyramidal; molecular geometry: seesaw C. Electron domain…
Which molecule has the largest net dipole moment? A. SiF4 B. CS2 C. H2S D. H2O
Which orbitals overlap to form the σ-bond and the two π-bonds between carbon and nitrogen in hydrogen cyanide, HCN? A. σ-bond: sp and sp3; π-bonds: p and p B. σ-bond: sp and sp; π-bonds: p and p C. σ-bond: sp…
Which statements about the allotropes of carbon are correct? I. Graphite conducts electricity because each carbon atom contributes one electron to a delocalized system. II. Diamond conducts electricity because it has a covalent network structure. III.…