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 8 zadań wzorowanych na arkuszach IB z lat 2023–2025.
Portions of the rinse water were then titrated with the standardized EDTA solution in the presence of murexide as indicator. The burette readings are given in the table. (i) Suggest two reasons why trial 1 required a much larger volume of EDTA than the other…
Chlorine molecules, Cl2, and bromine molecules, Br2, can both be split into atoms by radiation. Use section 12 of the data booklet. Explain how the wavelengths of radiation that can split Cl2 and Br2 molecules into atoms compare.
Atmospheric carbon dioxide and the pH of surface seawater were measured at a monitoring station over nineteen years. The graph shows the annual mean values. (i) Outline the relationship between the carbon dioxide mixing ratio and the pH of the seawater. (ii)…
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…
Bromine radicals form when the bond in a bromine molecule is broken by ultraviolet light. The energy needed to break the bond in one molecule of Br2 is 3.21 × 10−19 J. (i) Calculate the minimum frequency of light needed to break this…
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.…
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