Chem 210 Final exam study guide

What is ground state electron configuration of Co? [Ar]3d^9 [Ar]4s^1 3d^8 [Ar]4s^2 3d^7 [Ar]4s^2 4p^6 4d^1 - correct answer [Ar]4s^2 3d^7 molybdenum has an anomalous electron configuration. using the shorthand notation for electron configurations, write the electron configuration A) [kr]5s 4d^6 B) [kr]5s 4d^0 5p^6 C) [kr]5s^1 4d^5 D) [kr]5s^2 4d^4 - correct answer C) [kr]5s^1 4d^5 the symbol [Kr] represents a) 4s^2 4p^6 b) 1s^2 2s^2 2p^6 3s^6 4s^2 4p^6 c) 1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6 D)1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6 4d^10 - correct answer c) 1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6 What is the wavelength of UV light in the balmer series when m=2 and n=7? a) 0.00252 nm b) 397 nm c)337 nm d)0.00297 nm - correct answer b) 397 nm How many electrons can a single orbital hold? A) 2n B) 2 C) 2l+1 D)8 - correct answer B) 2 What are the possible values of I and m1 for an electron in a 5d orbitial? A) I=0 and mI=0 B) I=3 and MI=-2,-1,0,+1, or +2 c) I=1 and MI=-1,0,+1 D) I=2 and MI=-2,-1,0,+1, +2 - correct answer D) I=2 and MI=-2,-1,0,+1, +2 What is the the de Broglie wavelength of an electron (m=9.11e-31 kg) moving at a velocity of 3.0e7m/s? a) 3.9e-12 b)2.4e-11 c)3.3e-8 d)1.1e-4 - correct answer b)2.4e-11 What is the frequency of a helium-neon laser light with a wave of 632.8 nm? a) 4.47e14 s-1 b)4.47e5 s-1 c)2.11e-15 s-1 d)1.58e-15 s-1 - correct answer a) 4.47e14 s-1 What is the correct nuclear symbol for the unknown product "X" in the nuclear equation shown below? A)234 TH 90 B) 226 Ra 88 C) 234 U 90 D) 242 Pu 94 E) 234 Pu 94 - correct answer A)234 TH 90 The alpha particle is A)1 1 H B)2 1 H C)3 1 H D)4 2 He - correct answer D)4 2 He 15. An element has two naturally occurring isotopes. One has an abundance of 37.40% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956 amu. What is the atomic weight of the element? A) 185.7 amu B) 186.0 amu C) 186.2 amu D) 187.0 amu - correct answer C) 186.2 amu What is the chemical symbol for an atom that has 29 protons and 36 neutrons? A) Cu B)Kr C)N D)Tb - correct answer A) Cu How many protons (p) and neutrons (n) are in an atoms of 90Sr 38 A) 38 p, 52 n B) 38 p, 90 n C) 52 p, 38 n D) 90 p, 38 n - correct answer A) 38 p, 52 n The observation that hydrogen and oxygen can react to form two compounds with different chemical and physical properties, one having an O:H mass ratio = 8:1 and the other having an O:H mass ratio = 16:1 is consistent with the law of A)definite proportions B) energy conservation C) mass conservation D)multiple proportions - correct answer multiple proportions The observation that 15.0 g of hydrogen reacts with 120.0 g of oxygen to form 135.( g of water is evidence for the law of A) definite proportions. B) energy conservation. C) Mass conservation. D) multiple proportions. - correct answer Mass conservation Argon belongs to the ____group A) alkali metal B)alkaline earth C)halogen D) noble gas - correct answer D) noble gas Lithium belongs to the _____group of the periodic table: A) alkali metal B)alkaline earth C)halogen D) noble gas - correct answer A) alkali metal To the correct number of sig figs, an automobile traveling at 28 mi/h is traveling at ___kn/h (1 km=0.6214 mi) A)17 b)17.40 C)45 D45.06 - correct answer 45 how many sig figs are there in the following problem : 18.65+0.590=? A)one B)two C) three D) four - correct answer D) four Which of the following has the greatest number of sig figs? A)0.5070 B)0.201 C)418 D)6.02e24 - correct answer A)0.05070 A student measured the diameter of a sphere and determined the average value. His measurements are 5.17 cm, 5.16 cm, 5.16 cm, and 5.17 cm. If the true diameter is 6.18 cm, what can be said about the student's results? A) it is accurate and precise B)It is accurate but not precise C) it is precise but not accurate D) it is neither - correct answer C) it is precise but not accurate If the melthing point of titanium metal is 16720C, what is its melting point in kelvin? A)897K B)1399K C)1945K D)3042 - correct answer C) 1945 K The diameter of an atom is approximately 1e-10m what is the diameter in millimeters? A)1e-16mm B)1e-13mm C)1e-7mm D)1e-4 mm - correct answer C) 1e-7 ,, convert 0.003002 to standard scientific notoation A)3.002e-3 B)3002e-6 C)3.0023 D3002e6 - correct answer A) 3.00e-3 A laboratory procedure requires 4.67 g of a liquid whose density is 1.034 g/mL. What volume of liquid should be used for this procedure? A) 4.83 mL B) 4.52 mL C) 0.221 mL D) 5.70 mL - correct answer B) 4.53 mL Which of the species below has 28 protons and 26 electrons? A)Fe^2+ B)Ni^2+ C) 54 26Fe D) 54 28Ni - correct answer B)Ni^2+ The definitive distinction between ionic bonding and covalent bonding is that A) ionic bonding involves a sharing of electrons and covalent bonding involves a transfer electrons. B) ionic bonding involves a transfer of electrons and covalent bonding involves a sharing electrons. C) ionic bonding requires two nonmetals and covalent bonding requires a metal and a nonmetal. D) covalent bonding requires two nonmetals and ionic bonding requires a metal and a nonmetal. - correct answer B) ionic bonding involves a transfer of electrons and covalent bonding involves a sharing electrons. What type of bonding is found in the compound PC15? A) covalent bonding B) h