151F09_W8_LV_short

151F09_W8_LV_short - 1) Your cell phone broadcasts at a...

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UA GenChem 1) Your cell phone broadcasts at a typical frequency of 835 MHz ( 1.0 mega Hertz= 1x10 6 1/s). What is the energy of one photon of this type of electromagnetic radiation in Joules? A) 5.54 x10 -25 B) 7.94 x10 -43 C) 3.33 x10 -1 D) 1.66 x10 -16 E = hν c = λν
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UA GenChem 2) UVB radiation has a shorter wavelength than UVA radiation. IF UVB radiation causes sunburn and UVA causes only skin tanning what can you say about the photons of UVB? A) they carry less energy and have a higher frequency B) they carry less energy and have a lower frequency C) they carry more energy and have a lower frequency D) they carry more energy and have a higher frequency
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UA GenChem 3) A radioactive isotope of Technetium is used to diagnose cancer with bone scans. For + 2 99 43 Tc give the number of protons, neutrons and electrons separated by a comma. A) 43,56,43 B) 43,56,45 C) 43,99,41 D) 43,56,41 E) 99,43,41
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UA GenChem 5) Element X has only two isotopes 20X and 30X. If the average molar mass of element X is 23.0 g/mol which isotope occurs in the highest % abundance? A) 20X B) 30X C) 23X D) both equal 6) What is the correct electronic configuration for Ar? A) 1s 2 2s 2 2p 6 3s 2 3p 8 B) 1s 2 2s 2 2p 6 3s 2 3p 5 4s 1 C) [He]3s 2 3p 6 D) 1s 2 2s 2 2p 6 3s 2 3p 6
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UA GenChem E n = 1 n= 2 n = 3 A B C Wavelength 390 nm 550 nm 620 nm 9) Consider the following emission spectra of a hypothetical atom with three emission lines A,B, and C: A chemist builds a simple atomic model to explain this spectrum. She assumes electrons emit energy when moving between three different quantized states, as shown in the diagram: Which of the three possible transitions, A, B, or C, generates light with a wavelength of 390 nm? A) A B) B C) C
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UA GenChem 10) An element has the follow ionization energies. Ionization #1 Ionization #2 Ionization #3 Ionization #4 578 1817 2245 21,577 kJ/mole The element has _____ valence electrons. A) 1 B) 2 C) 3 D) 4 E) 0
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UA GenChem 15) 5pts Experiments show that compounds with Fe3+ ions are all paramagnetic with 5 unpaired electrons. Using electronic configurations and box diagrams for orbitals what is the correct configuration of Fe3+ ?
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UA GenChem Carbon 1s 2 2s 2 2p 2 Sodium 1s 2 2s 2 2p 6 3s 1 Oxygen 1s 2 2s 2 2p 4
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UA GenChem 2) Consider the element that corresponds with spectrum A and answer the following questions. The ionization energy of the 1s electrons in this element is 409.9 eV (1eV = 1.602 x 10 -19 J). What is the longest photon wavelength required to ionize a 1s electron in this element? Report you answer in nm. Convert 409.9 eV to kJ/mol. Is the common ion for this element diamagnetic or paramagnetic?
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UA GenChem The larger the charge of the ions the stronger the force between them. Force
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at Arizona.

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151F09_W8_LV_short - 1) Your cell phone broadcasts at a...

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