CHEM 10113, Quiz 2 September 7, 2011 Name (please print) All answers must use the correct number of significant figures, and must show units! IA Periodic Table of the Elements VIIIA (1) (18) 1 2 1 H IIA IIIA IVA VA VIA VIIA He 1.0080 (2) (13) (14) (15) (16) (17) 4.0026 3 4 5 6 7 8 9 10 2 Li Be B C N O F Ne 6.9410 9.0122 10.811 12.011 14.007 15.999 18.998 20.179 11 12 13 14 15 16 17 18 3 Na Mg IIIB IVB VB VIB VIIB.......... VIIIB..........IB IIB Al Si P S Cl Ar 22.990 24.305 (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) 26.982 28.086 30.974 32.066 35.453 39.948 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.098 40.078 44.956 47.880 50.942 51.996 54.938 55.847 58.933 58.690 63.546 65.380 69.723 72.610 74.922 78.960 79.904 83.800 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.468 87.620 88.906 91.224 92.906 95.940 98.907 101.07 102.91 106.42 107.87 112.41 114.82 118.71 121.75 127.60 126.90 131.29 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 6 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.91 137.33 138.91 178.49 180.95 183.85 186.21 190.20 192.22 195.09 196.97 200.59 204.38 207.20 208.98 208.98 209.99 222.02 87 88 89 104 105 106 107 108 109 110 111 112 114 7 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Uuu Uub Uug 223.02 226.03 227.03 (261) (262) (266) (264) (270) (268) (281) 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.12 140.91 144.24 145.91 150.36 151.97 157.25 158.93 162.50 164.93 167.26 168.93 173.04 174.97 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.04 231.04 238.03 237.05 244.06 243.06 247.07 247.07 242.06 252.08 257.10 258.10 259.10 260.11 1. (3 points) Give ONE example of each of the following: a halogen _fluorine, chlorine, bromine, iodine, or astatine an element in the same group as tungsten molybdenum, chromium, or seaborgium a metalloid boron, silicon, germanium, arsenic, antimony, tellurium, polonium an element that exists in nature as a diatomic molecule_oxygen or many other options an element that readily forms a 2+ cation Mg, Be, Ca, Sr, Ba, or Ra part of an atom found inside the nucleus proton or neutron 2. (5 points) Consulting the periodic table if needed (above), fill in the blanks to complete the table. Chemical Z A Number of Number of Number of Charge symbol p e- n 11 19 11 10 8 +1 26 57 26 29 31-3 1
3. (5 points) a) How many atoms of each element are represented in the following formula of tetrabutylammonium nitrate? (CH 3 CH 3 CH 3 CH 2 ) 4 N(NO 3 ) 16 carbons, 44 hydrogens, 2 nitrogens, 3 oxygens b) How many atoms of each element can be found in the products side of the following equation? Is the equation balanced? C 10 H 8(s) + 9 MnO 2(s) + H 2 SO 4(aq) C 8 H 6 O 4(s) + 2 CO 2(g) + MnSO 4(aq) + H 2 O (l) 10 carbons, 8 hydrogens, 13 oxygens, 1 manganese, one sulfur, not balanced 4. (4 points) SHOW ALL WORK. Chlorine s mass in the periodic table is given as 35.453 amu. It has two isotopes, A and B. Fill in the missing information about isotope B. Isotope Isotopic Abundance Isotopic Mass A 75.77% 34.968853 amu B 24.23% 36.97 amu 100 75.77 = 24.23 35.453 = (0.7577)(34.968853) + (0.2423)x x = (35.453 26.49589992)/0.2423 = 36.97 5. (1 point) If a 10 g sample of element X contains twice as many atoms as a 10 g sample of element Y, how does the atomic mass of X (mass X ) compare with the atomic mass of Y (mass Y )? mass X = ½(mass Y ) 6. (1 point) How many moles of sulfur are there in 3.92 moles of Ca(S 2 O 3 ) 2? 4(3.92) = 15.7 mol 7. (6 points) Upon hearing how many students would be in this class, Dr. Hanna began to hyperventilate. In 2 minutes she took 75 breaths of air. Given that each breath was 0.50 L, and that air contains 0.28 g of oxygen per liter, how many atoms of oxygen did Dr. Hanna inhale in those 2 minutes? 75 breaths x (0.50 L air)/(1 breath) x (0.28 g O)/(1 L air) x (1 mol O atoms)/(15.999 g O) x (6.022 x 10 23 O atoms)/(1 mol O atoms) = 4.0 x 10 23 O atoms 2
CHEM 10113, Quiz 2 September 7, 2011 Name (please print) All answers must use the correct number of significant figures, and must show units! IA Periodic Table of the Elements VIIIA (1) (18) 1 2 1 H IIA IIIA IVA VA VIA VIIA He 1.0080 (2) (13) (14) (15) (16) (17) 4.0026 3 4 5 6 7 8 9 10 2 Li Be B C N O F Ne 6.9410 9.0122 10.811 12.011 14.007 15.999 18.998 20.179 11 12 13 14 15 16 17 18 3 Na Mg IIIB IVB VB VIB VIIB.......... VIIIB..........IB IIB Al Si P S Cl Ar 22.990 24.305 (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) 26.982 28.086 30.974 32.066 35.453 39.948 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.098 40.078 44.956 47.880 50.942 51.996 54.938 55.847 58.933 58.690 63.546 65.380 69.723 72.610 74.922 78.960 79.904 83.800 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.468 87.620 88.906 91.224 92.906 95.940 98.907 101.07 102.91 106.42 107.87 112.41 114.82 118.71 121.75 127.60 126.90 131.29 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 6 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.91 137.33 138.91 178.49 180.95 183.85 186.21 190.20 192.22 195.09 196.97 200.59 204.38 207.20 208.98 208.98 209.99 222.02 87 88 89 104 105 106 107 108 109 110 111 112 114 7 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Uuu Uub Uug 223.02 226.03 227.03 (261) (262) (266) (264) (270) (268) (281) 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.12 140.91 144.24 145.91 150.36 151.97 157.25 158.93 162.50 164.93 167.26 168.93 173.04 174.97 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.04 231.04 238.03 237.05 244.06 243.06 247.07 247.07 242.06 252.08 257.10 258.10 259.10 260.11 1. (3 points) Give ONE example of each of the following: a noble gas helium, neon, argon, krypton, xenon, or radon an element in the same group as platinum palladium or nickel or darmstadtium a metal iron, or lots of other examples an element that exists in nature as a diatomic molecule oxygen, or many other examples an element that readily forms a 1+ cation H, Li, Na, K, Rb, Cs, or Fr part of an atom found outside the nucleus electron 2. (5 points) Consulting the periodic table if needed (above), fill in the blanks to complete the table. Chemical Z A Number of Number of Number of Charge symbol p e- n 35 75 35 36 40-1 17 37 17 16 20 +1 3
3. (5 points) How many atoms of each element are represented in the following formula of sodium oleate? CH 3 (CH 2 ) 7 CHCH(CH 2 ) 7 COONa 18 carbons, 33 hydrogens, 2 oxygens, 1 sodium How many atoms of each element can be found in the products side of the following equation? Is the equation balanced? FeTiO 3(s) + 3 Cl 2(g) + 3 C (s) 3 CO (g) + FeCl 2(s) + TiCl 4(g) 3 carbons, 3 oxygens, 1 iron, 6 chlorines, 1 titanium, yes, balanced 4. (4 points) SHOW ALL WORK. Antimony s mass in the periodic table is given as 121.75 amu. It has two isotopes, A and B. Fill in the missing information about isotope A. Isotope Isotopic Abundance Isotopic Mass A 57.30% 120.9 amu B 42.70% 122.904222 amu 100 42.70 = 57.30% 121.75 = (0.4270)(122.904222) + (0.5730)x x = (121.75 52.4801)/(0.5730) = 120.889873 120.9 amu 5. (1 point) If a 20 g sample of element X contains twice as many atoms as a 20 g sample of element Y, how does the atomic mass of X (mass X ) compare with the atomic mass of Y (mass Y )? mass X = ½(mass Y ) 6. (1 point) How many moles of nitrogen are there in 4.63 moles of Mg(NO 3 ) 2? 2(4.63) = 9.26 mol 7. (6 points) Upon hearing how many students would be in this class, Dr. Hanna began to hyperventilate. In 2 minutes she took 102 breaths of air. Given that each breath was 0.50 L, and that air contains 0.28 g of oxygen per liter, how many atoms of oxygen did Dr. Hanna inhale in those 2 minutes? 102 breaths x (0.50 L)/(1 breath) x (0.28 g O)/(1 L air) x (1 mol O)/(15.999 g O) x 6.022 x 10 23 atoms O)/(1 mol O) = 5.4 x 10 23 atoms 4
CHEM 10113, Quiz 2 September 7, 2011 Name (please print) All answers must use the correct number of significant figures, and must show units! IA Periodic Table of the Elements VIIIA (1) (18) 1 2 1 H IIA IIIA IVA VA VIA VIIA He 1.0080 (2) (13) (14) (15) (16) (17) 4.0026 3 4 5 6 7 8 9 10 2 Li Be B C N O F Ne 6.9410 9.0122 10.811 12.011 14.007 15.999 18.998 20.179 11 12 13 14 15 16 17 18 3 Na Mg IIIB IVB VB VIB VIIB.......... VIIIB..........IB IIB Al Si P S Cl Ar 22.990 24.305 (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) 26.982 28.086 30.974 32.066 35.453 39.948 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.098 40.078 44.956 47.880 50.942 51.996 54.938 55.847 58.933 58.690 63.546 65.380 69.723 72.610 74.922 78.960 79.904 83.800 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.468 87.620 88.906 91.224 92.906 95.940 98.907 101.07 102.91 106.42 107.87 112.41 114.82 118.71 121.75 127.60 126.90 131.29 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 6 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.91 137.33 138.91 178.49 180.95 183.85 186.21 190.20 192.22 195.09 196.97 200.59 204.38 207.20 208.98 208.98 209.99 222.02 87 88 89 104 105 106 107 108 109 110 111 112 114 7 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Uuu Uub Uug 223.02 226.03 227.03 (261) (262) (266) (264) (270) (268) (281) 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.12 140.91 144.24 145.91 150.36 151.97 157.25 158.93 162.50 164.93 167.26 168.93 173.04 174.97 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.04 231.04 238.03 237.05 244.06 243.06 247.07 247.07 242.06 252.08 257.10 258.10 259.10 260.11 1. (3 points) Give ONE example of each of the following: an alkali metal Li, Na, K, Rb, Cs, or Fr an element in the same group as tellurium O, S, Se, or Po a nonmetal oxygen or many other examples an element that exists in nature as a diatomic molecule oxgyen or many other examples an element that readily forms a 2- anion O, S, Se, Te, or Po the heaviest part of an atom nucleus 2. (5 points) Consulting the periodic table if needed (above), fill in the blanks to complete the table. Chemical Z A Number of Number of Number of Charge symbol p e- n 34 75 34 36 41-2 11 23 11 10 12 +1 5
3. (5 points) a) How many atoms of each element are represented in the following formula of heptamethyldisilazane? (CH 3 ) 3 SiN(CH 3 )Si(CH 3 ) 3 7 carbons, 21 hydrogens, 2 silicons, 1 nitrogen b) How many atoms of each element can be found in the products side of the following equation? Is the equation balanced? C 10 H 8(s) + 6 CrO 3(s) + H 2 SO 4(aq) C 8 H 6 O 4(s) + 2 CO 2(g) + 3 Cr 2 (SO 4 ) 3(aq) + H 2 O (l) 10 carbons, 8 hydrogens, 45 oxygens, 6 chromiums, 9 sulfurs, no, not balanced 4. (4 points) SHOW ALL WORK. Boron s mass in the periodic table is given as 10.811 amu. It has two isotopes, A and B. Fill in the missing information about isotope A. Isotope Isotopic Abundance Isotopic Mass A 19.80% 10.01 amu B 80.20% 11.009305 amu 100 80.20 = 19.80 10.811 = (0.8020)(11.009305) + (0.1980)x x = (10.811 8.82946)/(0.1980) = (1.98154)/(0.1980) = 10.01 amu 5. (1 point) If a 5 g sample of element X contains twice as many atoms as a 5 g sample of element Y, how does the atomic mass of X (mass X ) compare with the atomic mass of Y (mass Y )? mass X = ½(mass Y ) 6. (1 point) How many moles of nitrogen are there in 5.43 moles of Ca(NO 3 ) 2? 2(5.43) = 10.86 mol 7. (6 points) Upon hearing how many students would be in this class, Dr. Hanna began to hyperventilate. In 2 minutes she took 86 breaths of air. Given that each breath was 0.50 L, and that air contains 0.28 g of oxygen per liter, how many atoms of oxygen did Dr. Hanna inhale in those 2 minutes? 86 breaths x (0.50 L)/(1 breath) x (0.28 g O)/(1 L air) x (1 mol O)/(15.999 g O) x (6.022 x 10 23 atoms O)/(1 mol O) = 4.5 x 10 23 atoms O 6