PRINCIPLES OF CHEMISTRY I
PRINCIPLES OF CHEMISTRY I CH 301
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Date Created: 09/07/15
CH30150970 Help Sheet Exam1 operator 7 atom an e p momentum quantum no mg quantum no m5 energy to remove an 39 from a gaseous atom or ion of an electron to a gaseous atom increasing Zeff loss or gain of electrons Multicharged ions buck the general trend Sept 92011 Page 1 arriaga yga77 7 HW01 7 quy 7 50970 1 This print out should have 23 questions Multiple choice questions may continue on the next column or page 7 nd all choices before answering 001 100 points What is the correct order of decreasing fre quency 1 visible light7 ultraviolet radiation7 in frared radiation7 radio waves 2 radio waves7 infrared radiation7 visible light7 ultraviolet radiation 3 infrared radiation7 radio waves7 visible light7 ultraviolet radiation 4 ultraviolet radiation7 visible light7 in frared radiation7 radio waves correct 5 radio waves7 visible light7 ultraviolet radi ation7 infrared radiation Explanation ultraviolet radiation gt visible light gt infrared radiation gt radio waves 002 100 points Which of the following provided evidence that the electrons in atoms are arranged in distinct energy levels 1 the deflection of ions in a mass spectrom eter 2 the observation of line spectra from gas discharge tubes correct 3 the results of the Millikan oil drop exper iment 4 the existence of elements with noninteger values for atomic weights 5 the scattering of 04 particles by a metal foil Explanation The fact that gases emitted only speci c wavelengths of energy suggested that electron energy states are quantized 003 100 points Consider a ea of mass 45 gtlt 10 4 g moving at 10 ms midway through its jump What is its de Broglie wavelength 1 14725 gtlt 1030 m 2 29818 gtlt10 37 m 3 147244 gtlt 1027 m correct 4 29818 gtlt 10 40 m Explanation 0001 k m 000045 g x 7g 45 x10 7 kg h h A 4 p m 1 6626 gtlt 1034 kg TmZ 45 gtlt 10 7 kgl ms 147244 gtlt 10 27 m 004 100 points All of these are forms of electromagnetic radi ation except 1 plane polarized light 2 gamma rays 3 enantiomers correct 4 microwaves Explanation 005 100 points Visible light7 microwaves7 and x rays travel through empty space at 300 gtlt 108 m s7 1 True correct arriaga yga77 7 HW01 7 quy 7 50970 2 2 False Explanation All forms of electromagnetic radiation move at the same speed through empty space7 at speed c 3 gtlt108 ms 006 100 points Compared to a 280 nm photon7 a 320 nm photon has 1 shorter wavelength7 lower frequency7 lower energy 2 shorter wavelength7 lower frequency7 higher energy 3 longer wavelength7 higher frequency7 higher energy 4 longer wavelength7 higher energy lower frequency7 5 longer wavelength7 lower frequency7 lower energy correct 6 shorter wavelength7 higher frequency7 lower energy Explanation 007 100 points Which of the following statements is true re garding electromagnetic radiation 1 The frequency of electromagnetic radia tion determines how fast it travels 2 Electromagnetic radiation with a wave length of 600 nm travels faster than that with a wavelength of 400 nm 3 Electromagnetic radiation with a wave length of 400 nm travels faster than that with a wavelength of 600 nm 4 Electromagnetic radiation with a wave length of 400 nm has a frequency that is lower than that with a wavelength of 600 nm 5 Electromagnetic radiation with a wave length of 600 nm has a frequency that is lower than that with a wavelength of 400 nm cor rect Explanation v f A so A 7 Higher wavelengths cor respond to lower frequencies7 and vice versa 008 100 points What is the frequency of light with a wave length of 40 gtlt1077 m 1 75 gtlt 1014 s 1 correct 2 30 gtlt1014 s71 3 13 gtlt 1015 s71 4 120 s71 5 30 gtlt 1014 s71 Explanation 009 100 points The higher the frequency of light the 1 higher the speed of light 2 lower its energy 3 lower Planck7s constant 4 shorter its wavelength correct 5 None of these Explanation 010 100 points Frequency is 1 the number of waves passing a xed point in one second correct 2 the distance between successive peaks in a wave arriaga yga77 7 HW01 7 quy 7 50970 3 3 the distance between a peak in a wave to the next trough 4 the height of the wave Explanation De nition 011 100 points The wavelength of light with a frequency of 667 gtlt 1014 sf1 is 1 909 nm 2 650 nm 3 200 nm 4 450 nm correct Explanation 012 100 points Which of the following types of electromag netic radiation EM R has the greatest energy per photon infra red ultra violet radio or visible 1 ultra violet correct 2 infra red 3 radio 4 visible 5 They all have the same energy because they all travel at the same speed Explanation 013 100 points A photon of wavelength of 245 nm would correspond to what frequency 1 122 gtlt 1015 HZ correct 2122 gtlt1017 Hz 3122 gtlt10 1 Hz 4 122 gtlt 102 Hz Explanation c A 1 c 1 1 A i 3 gtlt 108 m s71 7 245 gtlt 10710 m 122 gtlt1015 Hz 014 100 points The fundamental particle of a chemical ele ment according to Dalton7s Theory is the 1 molecule 2 compound 3 electron 4 atom correct Explanation An atom is the smallest particle of an ele ment that retains the chemical identity of that element Compounds and molecules are both made up of a combination of atoms The fundamental particles of matter 7 protons neutrons and electrons 7 were not known at this time and are the same no matter what element they are found in 015 100 points Rutherford7s gold foil experiment demon strated that 1 electrons must have quantized energy lev els 2 Dalton was correct in claiming that atoms are hard structureless spheres 3 lead could be transformed into gold 4 the positive charge in an atom must reside in a dense core much smaller than the atom correct Explanation ln Rutherford7s gold foil experiment in arriaga yga77 7 HW01 7 quy 7 50970 4 1910 Oz alpha particles were red at gold foil and the resulting de ection of the parti cles were observed Most of the 04 particles went through the sample unde ected sug gesting that much of the atom was empty space But of the few 04 particles that were de ected they were de ected at all angles including some very wide angles The wide de ections suggested a very hard dense pos itively charged core in the atom However this core or nucleus must be small in relation to the overall size of the atom since so few of the 04 particles were de ected in the rst place It also suggests that the nucleus is sur rounded by a cloud of electrons at relatively great distances from the nuclei 016 100 points If an 04 particle hits a gold nucleus in a head on collision the 04 particle will not be de ected very much 1 True 2 False correct Explanation The 04 particle is SHe so it will de nitely bounce off any gold atom that it hits 017 100 points Most of the atom is empty space with a dense positively charged nucleus 1 False 2 True correct Explanation ln Rutherford7s gold foil experiment in 1910 Oz alpha particles were red at gold foil and the resulting de ection of the parti cles were observed Most of the 04 particles went through the sample unde ected sug gesting that much of the atom was empty space But of the few 04 particles that were de ected they were de ected at all angles including some very wide angles The wide de ections suggested a very hard dense pos itively charged core in the atom However this core or nucleus must be small in relation to the overall size of the atom since so few of the 04 particles were de ected in the rst place It also suggests that the nucleus is sur rounded by a cloud of electrons at relatively great distances from the nuclei 018 100 points The average speed of a helium atom at 2500 is 123 gtlt 103 ms What is the average wave length of a helium atom at this temperature 1 203 gtlt 10 11m 2 406 gtlt 1011 m 3 743 gtlt 10 15 m 4 811 X 10 11m correct 5 415 gtlt 10 12 m Explanation v 123 gtlt103 ms The mass of one He atom is 400 gmol 6022 gtlt 1023 atomsmol 664 gtlt 1024 g 664 gtlt 1027 kg massHe Using de Broglie7s relationship h h A n 7 1 my 6626 x 1034 kg mQs 664 gtlt 1027 kg 1230 ms 811294 gtlt 10 11m 019 100 points Which particle has the largest de Broglie wavelength assuming all have approximately equal velocities 1 One with a mass of 1 kg 2 One with a mass of 1 g 3 One with a mass of 1 mg correct Explanation