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CAIE A-Level Chemistry 28.1.2 Shapes of 3d Orbitals

Practise sketching and labelling the 3dxy and 3dz² orbitals relative to Cartesian axes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • draw 3dxy as four lobes lying in the xy plane between the x and y axes
  • draw 3dz² with two lobes along the z axis and a central torus in the xy plane
  • label the x, y and z axes so orbital orientation, not only the number of lobes, is unambiguous

28.1.2—Sketch the shape of a 3dxy orbital and 3dz² question 1

[Maximum number: 1]

Iodine is found naturally in compounds in many different oxidation states.

The concentration of Cu2+(aq)\mathrm{Cu}^{2+}(\mathrm{aq}) in a solution can be determined by the reaction of Cu2+\mathrm{Cu}^{2+} ions with I−\mathrm{I}^{-}ions.

reaction \(12 \mathrm{Cu}^{2+}+4 \mathrm{I}^{-} \rightarrow 2 \mathrm{CuI}+\mathrm{I}_{2}\)

The I2\mathrm{I}_{2} produced in reaction 1 is titrated against a solution containing thiosulfate ions, S2O32−\mathrm{S}_{2} \mathrm{O}_{3}{ }^{2-}, using a suitable indicator.

 reaction 22 S2O32−+I2→ S4O62−+2I−\text { reaction } 2 \quad 2 \mathrm{~S}_{2} \mathrm{O}_{3}^{2-}+\mathrm{I}_{2} \rightarrow \mathrm{~S}_{4} \mathrm{O}_{6}^{2-}+2 \mathrm{I}^{-}

Copper(I) and copper(II) both contain electrons in all five 3d orbitals.

Sketch the shape of a 3 dxy3 \mathrm{~d}_{\mathrm{xy}} orbital on the axes provided.

Figure for Question 28.1.2—Sketch the shape of a 3dxy orbital and 3dz² question 1 — CAIE A-Level Chemistry A2
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