Zadanie 7
Which is the electron configuration of an atom of a metallic element? A. [He] 2s2 2p3 B. [Ne] 3s2 3p5 C. [Ar] 3d6 4s2 D. [Ar] 3d10 4s2 4p4
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Which is the electron configuration of an atom of a metallic element? A. [He] 2s2 2p3 B. [Ne] 3s2 3p5 C. [Ar] 3d6 4s2 D. [Ar] 3d10 4s2 4p4
Which of the following ions are expected to be paramagnetic? I. V3+ II. Mn2+ III. Cu+ A. I and II only B. I and III only C. II and III only D. I, II and III
(i) State why ammonia can act as a Lewis base. (ii) Calculate the pH of a 2.50 × 10−2 mol dm−3 aqueous solution of ammonia. pKb = 4.75 at 298 K. (iii) Justify whether a 1.0 dm3 solution made by mixing 0.30 mol NH3…
(i) Sketch the shape of a sigma (σ) bond and of a pi (π) bond, showing the overlapping orbitals. Sigma (σ): Pi (π): (ii) Identify the number of sigma bonds and the number of pi bonds in one molecule of acrylonitrile. Sigma (σ): Pi (π): (iii) State the…
Acrylonitrile and but-1-ene have similar relative molecular masses but very different boiling points. Suggest why but-1-ene has a lower boiling point than acrylonitrile.
Explain why the complex ion [Cu(NH3)4]2+ is coloured.
A solution of hydrated nickel(II) ions, [Ni(H2O)6]2+, is green. Which statement explains the colour? A. Green light is absorbed when electrons are promoted between d-orbitals B. Light complementary to green is absorbed when electrons are promoted…
The complex ion [Co(H2O)6]3+ is blue and the complex ion [Co(NH3)6]3+ is orange. The colour absorbed by a complex is complementary to the colour observed. The colour wheel gives the wavelength of light of each colour. What is correct about the…
(i) Outline two differences between the bonding of carbon atoms in graphite and in diamond. (ii) Explain why fullerene, C60, sublimes at a much lower temperature than graphite.
(i) State two features that show that ethene and propene are members of the same homologous series. (ii) The mass spectrum of pentane is shown. Suggest the species responsible for peak R. Use section 22 of the data booklet.