PracticeExam3

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. a. 1 only b. 2 only c. 3 only d. 1 and 3 e. 1, 2, and 3 3. Which of the following properties is associated with the value of the m l quantum number? a. the number of electrons in an orbital b. the size of an orbital c. the shape of an orbital d. the energy of an orbital e. the orientation in space of an orbital 4. What 2+ ion has the following ground state electron configuration? a. Ni 2+ b. Co 2+ c. Ca 2+ d. Cu 2+ e. Mn 2+ 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? a. 6.59 10 -28 m b. 1.01 10 -6 m c. 3.32 10 -3 m d. 301 m e. 2.98 10 14 m 7. According to the Bohr model for the hydrogen atom, the energy necessary to excite an electron from n = 2 to n = 3 is ____ the energy necessary to excite an electron from n = 4 to n = 5. a. less than b. greater than c. equal to d. either equal to or greater than e. either less than or equal to 8. What type of orbital is designated n = 4, l = 3, m l = -3? a.
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PracticeExam3 - CHM 2045C Practice Exam 3 1. If the de...

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