General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN: 9781305580343
Author: Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher: Cengage Learning
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Determine the energy change associated with the transition from n = 7 to n = 2 in the hydrogen atom.
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- A particular microwave oven delivers 750 watts. (A watt is a unit of power, which is the joules of energy delivered, or used, per second.) If the oven uses microwave radiation of wavelength 12.6 cm, how many photons of this radiation are required to heat 1.00 g of water 1.00C, assuming that all of the photons are absorbed?arrow_forwardDescribe briefly why the study of electromagnetic radiation bas been important to our understanding of the arrangement of electrons in atomsarrow_forwardDescribe briefly why the study of electromagnetic radiation has been important to our understanding of the arrangement of electrons in atoms.arrow_forward
- The energy of a photon of visible light emitted by an excited atom is the energy change that takes place within the atom itself.arrow_forwardNeutrons are used to obtain images of the hydrogen atoms in molecules. What energy must be imparted to each neutron in a neutron beam to obtain a wavelength of 10.0 pm? Obtain the energy in electron volts (eV) (1 eV = 1.602 1019 J).arrow_forwardPlanck originated the idea that energies can be quantized. What does the term quantized mean? What was Planck trying to explain when he was led to the concept of quantization of energy? Give the formula he arrived at and explain each of the terms in the formula.arrow_forward
- According to a relationship developed by Niels Bohr, for an atom or ion that has a single electron, the total energy, En, of an electron in a stable orbit of quantum number n is En = [Z2/n2] (2.179 1018 J) where Z is the atomic number. Calculate the ionization energy for the electron in a ground-state He+ ion.arrow_forwardA hydrogen-like ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels of these ions are Z2RH/n2 (where Z = atomic number). Calculate the wavelength of the transition from n = 3 to n = 2 for He+, a hydrogen-like ion. In what region of the spectrum does this emission occur?arrow_forwardHow many unpaired electrons are there in an atom of (a) phosphorus? (b) potassium? (c) plutonium (Pu)?arrow_forward
- Light with a wavelength of 425 nm fell on a potassium surface, and electrons were ejected at a speed of 4.88 105 m/s. What energy was expended in removing an electron from the metal? Express the answer in joules (per electron) and in kilojoules per mole (of electrons).arrow_forwardFor each of the following elements, specify the extent to which the subshell containing the distinguishing electron is filled (s2, p3, p5, d4, etc.). a. 13Al b. 23V c. 20Ca d. 36Krarrow_forwardLight with a wavelength of 405 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.36 105 m/s, what energy was expended in removing the electron from the metal? Express the answer in joules (per electron) and in kilojoules per mole (of electrons).arrow_forward
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