Chem 210 Final exam study guide

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 - ANS [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 - ANS 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 - ANS 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 - ANS b) 397 nm How many electrons can a single orbital hold? A) 2n B) 2 C) 2l+1 D)8 - ANS 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 - ANS 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 - ANS 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 - ANS 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 - ANS A)234 TH 90 The alpha particle is A)1 1 H B)2 1 H C)3 1 H D)4 2 He - ANS 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 - ANS 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 - ANS 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 - ANS 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 - ANS 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. - ANS Mass conservation Argon belongs to the ____group A) alkali metal B)alkaline earth C)halogen D) noble gas - ANS D) noble gas Lithium belongs to the _____group of the periodic table: A) alkali metal B)alkaline earth C)halogen D) noble gas - ANS 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 - ANS 45 how many sig figs are there in the following problem : 18.65+0.590=? A)one B)two C) three D) four - ANS D) four Which of the following has the greatest number of sig figs? A)0.5070 B)0.201 C)418 D)6.02e24 - ANS 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 - ANS 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 - ANS 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 - ANS C) 1e-7 ,, convert 0.003002 to standard scientific notoation A)3.002e-3 B)3002e-6 C)3.0023 D3002e6 - ANS 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 - ANS 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 - ANS 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. - ANS 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) hydrogen bonding C) ionic bonding D) metallic bonding - ANS A) covalent bonding Which one of the following compounds contains ionic bonds? A) CaO B)HF C)NI3 D) Si02 - ANS A) CaO Of the following, which element has the highest first ionization energy? A) Al B) Cl C) Na D) P - ANS B) Cl Which is the most acceptable electron dot structure for N2H2? - ANS B) Which element can accommodate more then eight electron is its valance shell A) C B) O C) P D) He - ANS C) P Which of the following contains an atom that does not obey the octect rule? A) KBr B) CO2 C)CIF3 D)ICI - ANS C) CIF3 consider a molecule with the following connections: when a vaild electron dot structure is written how many double bonds will the molecule contain? A) 0 B) 1 C) 2 D) 4 - ANS C) 2 How many resonanse structures are required in the electron-dot structure of CO3^2- A) two B) three C) four D) five - ANS B) three Assign formal cahared to each atom in the resonance form for SOCl2 given below A) 0 for cl, 0 for S, 0 for O B)0 for cl, +1 for S, -1 for O C) -1 for cl, +4 for S, -2 for O D) -1 for cl, -2 for S, -2 for O - ANS B)0 for cl, +1 for S, -1 for O the name for the compound formed from fluorine and bromine is A) bromine monofluoride B)fluorine monobromide C) monobromine momofluoride D) monofluorine monobromide - ANS A) bromine monofluoride What geometric arrangement of charge clouds is expected for an atom that has five charge clouds? A) tetrahedral B)square planar C) trigonal bipyramidal D) octahedral - ANS C) trigonal bipyramidal What is the molecular geometry of AsCl3 A) T-shaped B) tetrahedral C)trigonal planar D) trigonal pyramimidal - ANS D) trigonal pyramimidal Which orbital hybridization is associated with a tetrahedral charge cloud arragement? A) sp B) sp2 C) sp3 - ANS C) sp3 A triple bond is generally composed of A) three pi bonds B)two pi bonds and one ohmaga bond C) one pi bond and two ohmaga bond D) three ohmaga bonds - ANS B) two pi bonds and one ohmaga bond what is the molecular geometry of If5? A) octahedral B) seesaw C)square pyradmidal D) trigonal bipyramidal - ANS C)square pyradmidal What are bond angles in BCl3 A) 180 B) 109.5 C) 107 D) 120 - ANS D) 120 The MO diagram below is appropiate for B2 based on the diagram, B2 A) has a bond order of one and is diamagnetic B) has a bond order of one and is paramagnetic C) has a bond order of two and is diamagnetic D) has a bond order of two and is paramagnetic - ANS A) has a bond order of one and is diamagnetic Where are electron affinity values the highest? A) top left B) bottom left C) Top right D) Bottom right - ANS C) Top right Li2S is named A) lithium disulfide B) lithium sulfide C) lithium(II) sulfide D) lithium sulfur - ANS B) lithium sulfide What is the chemical formula for ferrous phosphate? A) Fe2P B) Fe2PO4 C)Fe3P2 D)Fe3(PO4)2 - ANS D)Fe3(PO4)2 Group 2A metals tend to be somewhat less reactive than alkali metals, and the order of their reacivity is A) Ba>Sr>Ca>mg>Be B)Be>Mg>Ca>Sr>Ba C) Ca>Mg>Be>Ba>Sr D) Sr>Ca>Mg>Be>Ba - ANS A) Ba>Sr>Ca>mg>Be which molecule contains the most polar bonds? A)CF4 B)CO2 C)CN D)CH4 - ANS A) CF4 The formula for dinitrogen trioxide is A) N(OH)3 B) (NO3)2 C) N2O3 D) N3O2 - ANS C) N2O3 What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients A) 3 B) 5 C) 7 D) 9 - ANS D) 9 . What is the mass of 0.500 mol of dichlorodifluoromethane, CF2CI2? A) 4.14e-3 B)60.5 g C) 121 g D) 242 g - ANS B) 60.5 g How many moles of CuO can be produced from 0.450 mol of Cu2O in the following reaction? A) 0.900 mol B) 0.450 mol C) 0.225 mol D) 1.80 mol - ANS A) 0.900 mol When 10.0 g of calcium metal is reacted with water, 5.00 g of calcium hydroxide is produced. Using the following balanced equation, calculate the percent yield for the reaction? A) 13.5% B) 27.1% C) 50.0% D) 92.4% - ANS B) 27.1% Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation: 2 SO + 3 02(g) + 4 NaOH(aq) --9 2 Na2S04(aq) + 2 H20(1) A) S(s) B) O2(g) C) NaOH(aq) D) none of theses - ANS A) S What is the concentration of FeCI3 in a solution prepared by dissolving 10.0 g of FeCI3 in enough water to make 275 mL of solution? A) 0.224 M B) 2.224e-4 M C) 4.46 M D) 4.46e3 M - ANS A) 0.224 M Which of the following compounds contains the smallest percent oxygen by mass? A) CO2 B)N2O4 C)P4O10 D)SO2 - ANS D) SO2 Which one of the following is an empirical formula? A) C2F6 B)H2SO4 C) N2H4 D) P4O10 - ANS B) H2SO4 What term describes a solution of covalent-compound in water that does not conduct an electric current? A) amorphous solution B an electrolyte solution C) nonelectrolyte solution D) superconducting solution - ANS C) nonelectrolyte solution What is the solid product that forms when K2SO4(aq) and Pb(NO3)2(aq) are mixed? A) PbSO4 B) K2S03 C) Pb D) KN03 - ANS A) PbSO4 What is the chemical formula for sulfurous acid? A) H2S(aq) B) H2SO3 C) H2SO4 D) H2S2O7 - ANS B) H2SO3 12. What is the oxidation number of the chromium atom in K2Cr2O7? A) -2 B) +2 C) +6 D) +7 - ANS C) +6 What are the coefficients in front of NO3-(aq) and Cu(s) when the following redox equation is balance in an acidic solution A) 2,3 B)2,6 C)3,4 D)3,6 - ANS A) 2,3 What is the general term for the process in which a chemical species loses electrons? A) base B) Reduction C) dioxidation D) oxidation - ANS D) oxidation Which species functions as the reducing agent in the following reduction-oxidation reaction: ZnO+C-----> Zn + CO A) C B) CO C) Zn D) ZnO - ANS A) C what ion is produced when arrhenius bases dissolve in water? A) H+ B) Na+ C) Cl- D) OH- - ANS D) OH- Which of the following is not a state function? A) altitude B)Heat C) internal energy D) volume - ANS Heat Calculate the work energy, w, gained or lost by the system when a gas expands from 15L to 35L against a constant external pressure of 1.5 atm.{1L*atm=101J} A) -5.3kJ B)+3.0kJ C) -3.0kJ D) +5.3 - ANS C) -3.0 kJ A reaction is carried out at constant pressure; q=125kJ and w=-15kJ. what are values of ^V and ^H a) E=110kJ and H=125kJ B)E=125kJ and H=110kJ C) E=125kJ and H-140kJ D) E=140 and H=125kJ - ANS A) 110kJ and 125 Which of the following statements does not represent an exothermic reaction? A) Heat is transferred from system to surroundings B) Heat is transferred from surroundings to system ) C) Feels hot D) Energy is represented as a product - ANS B) heat is transferred from surrounding to system The enthalpy of fusion, or heat of fusion (^Hfusion) of water is positive and corresponds to which physical change? A) H20(g) -> H20(s) B) H20(1) --> H20(s) C) H20(s) -> H20(1) D) H20(s) -> H20(g) - ANS C) H20(S)---->H20(I) The specific heat of copper is 0.385 J/(g • 0C). If 34.2 g of copper, initially at 250C absorbs 4.689 kJ, what will the final temperature of the copper be? (Hint: check your units) A)25.4 C B)27.8 C C) 356 C D) 381 C - ANS C) 356 C use the given standard enthalpies of formation to calculate ^Hrxn for the following 3 Fe2O3(s) + CO(g) -> 2 Fe3O4(s) + CO2(g) A) -5213.4 kJ B)-577.2 kJ C) -47.2 D) +47.2kJ - ANS C) -47.2 kJ One method for making ethanol, C2H50H, involves the gas-phase hydration of ethylene, C2H4. Estimate AH for this reaction from the given average bond dissociation energies, D A) -35 kJ B)-580 kJ C) +35 kJ D) 580 kJ - ANS A) -35 kJ Which of the following can be interpreted as a measure of randomness? A) enthalpy B) entropy C) free energy D) temperature - ANS B) entropy