Describe the hydrogen emission spectrum as evidence for discrete energy levels that converge at higher energy, and match the ultraviolet, visible and infrared series of lines to electron transitions ending at n = 1, n = 2 and n = 3.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Energy can also be produced by a hydrogen-oxygen fuel cell that uses an aqueous solution of sodium hydroxide as the electrolyte. Hydrogen gas is fed to the anode and oxygen gas to the cathode. (i) Deduce the half-equations for the electrode reactions in this…
Which statement about the visible line emission spectrum of atomic hydrogen is correct? A. The lines are equally spaced because the energy levels are equally spaced B. The lines get closer together towards longer wavelength because the energy levels converge…
When an electric discharge is passed through hydrogen gas at low pressure, the emitted light forms a line emission spectrum: a series of separate, sharp lines that converge as the frequency increases, rather than a continuous band of colour. What does this…
Which feature of the hydrogen emission spectrum shows that the spacing between the electron energy levels decreases as the energy of the levels increases? A. The lines within each series get closer together towards the high-frequency end B. The spectrum…
Lithium can be identified in the light emitted by stars and by flames containing lithium compounds. (i) Outline the appearance of the emission spectrum of lithium. The emission spectrum of a one-electron species, such as the Li2+ ion, can be explained…
Which electron transition in a hydrogen atom emits radiation with the longest wavelength? A. n = 2 to n = 1 B. n = 3 to n = 2 C. n = 4 to n = 3 D. n = 1 to n = 4
Which electron transition produces the line of longest wavelength in the visible region of the hydrogen line emission spectrum? A. Transition A B. Transition B C. Transition C D. Transition D
An electron in a hydrogen atom falls from the energy level n = 4 to the energy level n = 2. Which statement is correct? A. A photon is emitted and its energy equals the difference between the two energy levels B. A photon is absorbed and its energy equals…
The diagram represents the electron energy levels in a hydrogen atom. (i) Suggest two features of the behaviour of electrons in atoms that this energy level model cannot explain or represent. (ii) Draw an arrow, labelled Z, on the diagram to represent the…
Which observation provides evidence that electrons in atoms occupy discrete energy levels? A. The line emission spectrum of hydrogen B. The deflection of alpha particles by a thin gold foil C. The existence of isotopes of an element D. The deflection of…
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