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1 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) H IIA IIIA IVA VA VIA VIIA He (2) (13) (14) (15) (16) (17) Li Be B C N O F Ne Na Mg IIIB IVB VB VIB VIIB VIIIB IB IIB Al Si P S Cl Ar (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Uuu Uub Uug (261) (262) (266) (264) (270) (268) (281) Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr (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

2 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 amu. It has two isotopes, A and B. Fill in the missing information about isotope B. Isotope Isotopic Abundance Isotopic Mass A 75.77% amu B 24.23% amu = = (0.7577)( ) + (0.2423)x x = ( )/ = (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)/( g O) x (6.022 x O atoms)/(1 mol O atoms) = 4.0 x O atoms 2

3 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) H IIA IIIA IVA VA VIA VIIA He (2) (13) (14) (15) (16) (17) Li Be B C N O F Ne Na Mg IIIB IVB VB VIB VIIB VIIIB IB IIB Al Si P S Cl Ar (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Uuu Uub Uug (261) (262) (266) (264) (270) (268) (281) Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr (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

4 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 amu. It has two isotopes, A and B. Fill in the missing information about isotope A. Isotope Isotopic Abundance Isotopic Mass A 57.30% amu B 42.70% amu = 57.30% = (0.4270)( ) + (0.5730)x x = ( )/(0.5730) = 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)/( g O) x x atoms O)/(1 mol O) = 5.4 x atoms 4

5 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) H IIA IIIA IVA VA VIA VIIA He (2) (13) (14) (15) (16) (17) Li Be B C N O F Ne Na Mg IIIB IVB VB VIB VIIB VIIIB IB IIB Al Si P S Cl Ar (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Uuu Uub Uug (261) (262) (266) (264) (270) (268) (281) Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr (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

6 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 amu. It has two isotopes, A and B. Fill in the missing information about isotope A. Isotope Isotopic Abundance Isotopic Mass A 19.80% amu B 80.20% amu = = (0.8020)( ) + (0.1980)x x = ( )/(0.1980) = ( )/(0.1980) = 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) = 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)/( g O) x (6.022 x atoms O)/(1 mol O) = 4.5 x atoms O 6

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