Explain how atoms emit photons when excited electrons fall to lower energy levels, relate colour, wavelength, frequency and energy across the electromagnetic spectrum, and distinguish a continuous spectrum from a line spectrum.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2022–2025.
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…
Which statement correctly compares infrared and ultraviolet radiation? A. Infrared radiation has a longer wavelength and a lower photon energy than ultraviolet radiation. B. Infrared radiation has a longer wavelength and a higher frequency than ultraviolet…
Each of the two bonds between oxygen atoms in an ozone molecule, O3, has a bond order of 1.5, whereas the bond between the oxygen atoms in an oxygen molecule, O2, has a bond order of 2. Which allotrope has the longer bond between oxygen atoms,…
Ultraviolet (UV) light is being investigated as a way of killing micro-organisms in juice without heating it, so that less vitamin C is lost. The absorption spectrum of a dilute aqueous solution of sorbic acid, a preservative that is added to some bottled…
UV-C irradiation is an alternative to heat treatment that causes less loss of nutrients. The absorption spectrum of a solution of vitamin C is shown. (i) Deduce the type of electromagnetic radiation absorbed by vitamin C. Use section 5 of the data booklet.…
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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