PracticeExam3 - CHM 2045C Practice Exam 3 1 If the de...

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CHM 2045C Practice Exam 3 1. If the de Broglie wavelength of an electron is 555 nm, what is its velocity? The mass of an electron is 9.1 10 -31 kg. a. 4.0 10 -10 m/s b. 7.6 10 -4 m/s c. 5.2 10 2 m/s d. 1.3 10 3 m/s e. 2.5 10 9 m/s 2. Which of the following statements concerning ground state electron configurations are CORRECT? 1. In a hydrogen atom with one electron, the 2 s and 2 p orbitals have different energy. 2. For a lithium atom with three electrons, the 2 s and 2 p orbitals have different energies. 3. The effective nuclear charge felt by an electron in a 2 p orbital is larger for carbon than for fluorine. 3. Which of the following properties is associated with the value of the m l quantum number? 4. What 2+ ion has the following ground state electron configuration? 5. How many electrons can be described by the following quantum numbers: n = 4, l = 3, m l = -2, m s = +1/2? a. 0 b. 1 c. 2 d. 3 e. 6
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6. If an AM radio station broadcasts at 995 kHz, what is the wavelength of this radiation?
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