Lon Capa HW 3 - Chem 102 fully solved 2023

Lon Capa HW 3 - Chem 102 fully solved 2023In order to effectively radiate a radio signal, an antenna must be at least one-half the wavelength of transmission in length, i.e., minimum antenna height = 1/2(λ). WDWS operates at a frequency of 1400. kHz. What is the minimum height (m) of the antenna that WDWS (news/talk radio) must have? The speed of light, c, is 2.998 x 10⁸ m/s. - correct answer 107.1 m An electron is excited from the ground state to n=5 in a hydrogen atom. Decide if the following statements are true or false. a) For n=5 the electron is in an excited state. b) The wavelength of light emitted if the electron drops from n=5 to n=4 will be shorter than the wavelength of light emitted when the electron falls from n=5 to n=3. c) The wavelength of light emitted when the electron falls to the ground state from n=5 will be the same as the wavelength of light absorbed to go from the ground state to n=5. d) The electron is closer to the nucleus on average in the n=5 state than in the n=1 state. e) It takes less energy to ionize the electron from n=5 state than from the ground state. - correct answer a) true b) false c) true d) false e) true Calculate the energy (J) of the photon emitted when an electron in the hydrogen atom falls from n=4 to n=2 . Use 2.178 x 10⁻¹⁸ J for the constant in the Bohr equation. - correct answer 4.084×10⁻¹⁹ J Calculate the wavelength (m) of the light emitted during the transition from n=6 to n=1 . - correct answer 9.387×10⁻⁸ m Enter the electron configuration for Te- using noble gas shorthand notation. - correct answer [Kr] 5s²0f⁰4d¹⁰5p⁵ Enter the electron configuration for At using noble gas shorthand notation. - correct answer [Xe] 6s²4f¹⁴5d¹⁰6p⁵ Which of the following statements are true? a) The ground state electron configuration for Cu is [Ar]4s¹3d¹⁰. b) The ground state electron configuration for the undiscovered element 115 is [Rn]7s²5f¹⁴6d¹⁰7p³. c) The element with a ground state electron configuration of [Kr]5s²4d¹⁰5p⁵ has 10 valence electrons. d) The element with a ground state electron configuration of 1s²2s²2p⁶3s¹ is an alkali metal. e) The electron configuration of 1s²2s²2p⁶3s²3p⁶4s¹3d⁵ is an excited state electron configuration for Mn. f) If an element (abbreviated X) has a ground state electron configuration of [Ne]3s²3p⁴, then the formula of the compound that X forms with magnesium is Mg₂X. - correct answer a) True b) True c) False d) True e) False f) False Rank the following elements in order of increasing number of unpaired electrons. Sb, Re, K, Ni, Zn fewest unpaired e- → most unpaired e- - correct answer Zn, K, Ni, Sb, Re Indicate if the following are the correct ground state electron configurations for the atom listed by selecting correct or incorrect. a) Co³⁺: [Ar]4s⁰3d⁸ b) Fe: [Ar]4s²3d⁶ c) Cr: [Ar]4s¹3d⁵ d) Cd: [Kr]5s²3f¹⁴4d¹⁰ e) Ti²⁺: [Ar]4s²3d⁰ f) Cu⁺: [Ar]4s⁰3d¹⁰ - correct answer a) incorrect