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Chem133 lesson 3 questions with verified correct answers 2024

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2024/2025

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Download Chem133 lesson 3 questions with verified correct answers 2024 and more Exams Chemistry in PDF only on Docsity! 160 nm n = 4 to n = 3 Chem133 lesson 3 questions with verified correct answers 2024 4 / 4 points Calculate the wavelength of a neutron that has a velocity of 250 cm/s. mneutron = 1.675 × 10–24 g Question options: 1.6 × 10–4 nm 0.16 nm 0.016 nm 1.6 pm 4 / 4 points For which of the following transitions does the light emitted have the longest wavelength? Question options: n = 3 to n = 2 n = 2 to n = 1 n = 4 to n = 2 n = 4 to n = 1 larger the average distance from the nucleus and the higher the orbital energy. 492.6 nm 4 / 4 points For an electron in a given atom, the larger n, the Question options: smaller the average distance from the nucleus and the higher the orbital energy. larger the average distance from the nucleus and the lower the orbital energy. smaller the average distance from the nucleus and the lower the orbital energy. 4 / 4 points A common way of initiating certain chemical reactions with light involves the generation of free halogen atoms in solution. For the reaction, Cl2(g) → 2Cl(g) ΔH = 242.8 kJ/mol what is the longest wavelength of light that will produce free chlorine atoms in solution? Question options: 698.6 nm 246.3 nm 465.2 nm 349.3 nm 2.04 × 10–18 J 646 nm He emphasized its usefulness in predicting the existence and properties of unknown elements. 2.25 × 10–18 J 2.19 × 105 J 3.27 × 10–17 J 4 / 4 points What is the wavelength of a photon of red light (nm) whose frequency is 4.64 x 1014 Hz? Question options: 155 nm 464 nm 1.55 x 106 nm 4 / 4 points Mendeleev is given the most credit for the concept of a periodic table of the elements because: Question options: His periodic table was arranged in octaves. He grouped elements into triads of similar properties. the wavelength of the photon will be about 1800 times longer than the wavelength of the electron. [Kr]4d2 His representation of the table was the most understandable. He had the longest history of research in elemental properties. 0 / 4 points A proton is roughly 1800 times more massive than an electron. If a proton and an electron are traveling at the same speed, Question options: the wavelength of the photon will be roughly equal to the wavelength of the electron. the wavelength of the electron will be about 1800 times longer than the wavelength of the photon. the wavelength of the electron will be about (1800)1/2 times longer than the wavelength of the photon. the wavelength of the photon will be about (1800)1/2 times longer than the wavelength of the electron. 4 / 4 points What is the ground state electron configuration for Zr2+? Question options: [Kr]5s24d2 [Kr]5s2 [Kr] Br < Se < Cs [Kr]5s24d4 4 / 4 points Place the following in order of increasing metallic character: Br, Cs, Se Question options: Br < Cs < Se Cs < Br < Se Cs < Se < Br Se < Br < Cs 4 / 4 points Place the following in order of increasing radius: Br- Na+ Rb+ Question options: Br- < Na+ < Rb+ Rb+ < Br- < Na+ Rb+ < Na+ < Br- 2 4.03 × 1014 s-1 3 1 4 4 / 4 points What is the frequency of electromagnetic radiation with a wavelength of 745 nm appears as red light to the human eye? Question options: 2.48 × 10-15 s-1 4.03 × 105 s-1 2.24 × 102 s-1 2.24 × 1011 s-1 4 / 4 points What are the possible values of l if n = 4? Question options: 4 -4, +4 0, 1, 2, or 3 Po angular momentum quantum number -5, -4, -3, -2, -1, 0, +1, +2, +3, +4, or +5 -4, -3, -2, -1, 0, +1, +2, +3, or +4 4 / 4 points Which element has the highest first electron affinity? Question options: Rn Ra Fr 4 / 4 points Which of the following quantum numbers describes the shape of an orbital? Question options: Schrödinger quantum number principal quantum number spin quantum number magnetic quantum number 81 0 / 4 points How many valence shell electrons does an atom of thallium have? Question options: 3 2 1 92 / 100 - 92 % 92 / 100 - 92 %