Answer Key 2012-2013 Summer School Assessment Chemistry Unit 3

Answer Key2012-2013 Summer School AssessmentChemistry Unit 3QuestionNumberCorrectAnswerHISDObjectiveGradeLevel/CourseTEKSSEProcessStandardSource forcopyrightmonitoring1 C CHEM.8B CHEM 8 B CHEM.2G HISD2 A CHEM.8D CHEM 8 D CHEM.2G HISD3 D CHEM.8B CHEM 8 B CHEM.2G HISD4 B CHEM.8D CHEM 8 D CHEM.2G HISD5 D CHEM.10F CHEM 10 F HISD6 A CHEM.10F CHEM 10 F CHEM.2H HISD

2012-2013 HISD Summer School AssessmentChemistry Unit 3Name1 How many atoms are in 28.0 grams ofcopper?Date3 How many ions are present in 50.0 gramsof hydrogen cyanide (HCN)?A1.12 x 10 28 atomsA7.50 x 10 23 ionsB1.47 x 10 24 atomsB1.12 x 10 24 ionsC2.65 x 10 23 atomsC3.36 x 10 24 ionsD3.42 x 10 20 atomsD2.23 x 10 24 ions2 Ethane (C 2 H 6 ) is a colorless gas used as afuel. Ethane burns in oxygen to producecarbon dioxide and water. The balancedchemical equation that describes thisreaction is –ABCD2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O2C 2 H 6 + 5O 2 3CO 2 + 6H 2 OC 2 H 6 + 7O 2 4CO 2 + 3H 2 O3C 2 H 6 + 7O 2 6CO 2 + 9H 2 OPage 1Chemistry © Houston ISD – Curriculum 2012 – 2013

4 When calcium carbonate reacts with vinegar, bubbles of carbon dioxide form. What is themissing product in the balanced reaction below?CaCO 3 + 2CH 3 COOH Ca(CH 3 COO) 2 + CO 2 + ____________ABCDCOH 2 OCaOC 2 HO5 Which of the following procedures would increase the rate of dissolution of a gas in a liquid?1. Increase the temperature2. Increase the pressure3. Shake or stir the mixture4. Increase the surface areaAB1 and 2 only2 and 4 onlyC 1, 2, and 3D 2, 3, and 4Page 2Chemistry © Houston ISD – Curriculum 2012 – 2013

6 Based on the graph below, an increase in temperature –ABCDusually affects the solubility of ionic compoundscauses compounds to dissolveincreases the rate at which substances dissolveincreases the solubility of ionic compoundsBE SURE YOU HAVE RECORDED ALL OF YOURANSWERS ON THE ANSWER DOCUMENTPage 3Chemistry © Houston ISD – Curriculum 2012 – 2013

STAAR CHEMISTRYREFERENCE MATERIALSSTAARTMState of TexasAssessments ofAcademic ReadinessATOMIC STRUCTURESpeed of light = (frequency)(wavelength) c = fλEnergy = (Planck’s constant)(frequency) E photon= hf(Planck’s constant)(speed of light)Energy =(wavelength)BEHAVIOR OF GASESsum of the partial pressuresTotal pressure of a gas =( )of the component gasesP = P + P + P +TE photon1 2 3hc= λ...(Pressure)(volume) = (moles)(ideal gas constant)(temperature) PV = nRT(Initial pressure)(initial volume)(Initial moles)(initial temperature)=(final pressure)(final volume)(final moles)(final temperature)PV1 1nT1 1=PV2 2nT2 2(Initial pressure)(initial volume) = (final pressure)(final volume) PV = PV1 1 2 2(Initial volume)(Initial temperature)=(final volume)(final temperature)VT11=VT22(Initial volume)(Initial moles)=(final volume)(final moles)Vn11=Vn22SOLUTIONSmoles ofsoluteMolarity = M = molliter of solutionLhydrogen ion hydroxide ion+ −Ionization constant of water =concentration concentrationK w= [H ][OH ]( )( )(Volume of molarity ofsolution 1 solution 1 = volume of molarity ofsolution 2 solution 2VM = VM)( ) ( )( )1 1 2 2+pH = −logarithm (hydrogen ion concentration) pH =−log[H ]THERMOCHEMISTRYHeat gained or lost = (mass) specific change in( heat )( )temperatureEnthalpy of enthalpy= of products − enthalpyof reactantsreaction ( ) ( )Q = mc ∆ Tpoo∆H = ∆Hf(products)− ∆Hf(reactants)

STAAR CHEMISTRYREFERENCE MATERIALSOTHER FORMULASmassDensity = D =volumeaccepted value − experimental valuePercent error =( accepted value ) (100)Percent yield =( )actual yieldtheoretical yield (100)CONSTANTS AND CONVERSIONSmV23Avogadro’s number = 6.02 × 10 particles per mole4alpha particle ( α ) = He 2h = Planck’s constant = 6.63 × 10 34 J ⋅ s8c = speed of light = 3.00 × 10 m s14K ionization constant of water 1.00 × 10−w= =0beta particle () β = e −1−(molL)2neutron1= n 0standard temperature and pressure (STP) = 0°C and 1 atm0°C = 273 Kvolume of ideal gas at STP = 22.4 Lmol1cm 3 = 1 mL = 1cc1 atm = 760 mm Hg = 101.3 kPaR =ideal gas constant 0.0821 L ⋅=atmmol ⋅ K=8.31 L ⋅ kPamol ⋅ K=62.4L ⋅ mm Hgmol ⋅ K1 calorie (cal) = 4.18 joules (J)1000 calories (cal) = 1 Calorie (Cal) = 1 kilocalorie (kcal)RULES FOR SIGNIFICANT FIGURES1. Non-zero digits and zeros between non-zero digits are always significant.2. Leading zeros are not significant.3. Zeros to the right of all non-zero digits are only significant if a decimal point is shown.4. For values written in scientific notation, the digits in the coefficient are significant.5. In a common logarithm, there are as many digits after the decimal point as there aresignificant figures in the original number.

Increasing ActivitySTAAR CHEMISTRYREf ERENCE M ATERIALSPOLYATOMICIONSSOLubILITY Of COMMONIONIC COMPOuNdS IN WATER−Acetate C H O2 3 2 , CH3 COOAmmonium NH 4+Carbonate CO 32−Chlorate ClO 3−Chlorite ClO 2−Chromate CrO 42−Cyanide CN −2−Dichromate Cr 2O 7Hydrogen carbonate HCO 3−−Solublecompounds contain−C H O , CH COO−Common exceptionsNone2 3 2 3+NH None4−NO 3NoneCN −NoneClO −None−ClO 2None−ClO 3None−ClO 4NoneBr −Compounds of Ag + , Pb 2+ 2+, and Hg 2Cl −Compounds of Ag + , Pb 2+ 2+, and Hg 2I −Compounds of Ag + , Pb 2+ 2+, and Hg 2S 2−Hydroxide OH −SO 42−Compounds of Sr 2+ , Ba 2+ , Pb 2+ , and Hg 22+Hypochlorite ClO −−Nitrate NO 3−Nitrite NO 2Insolublecompounds containCO 32−PO 43−Common exceptions+Compounds of NH and the alkali metal cations4+Compounds of NH and the alkali metal cations4Perchlorate ClO 4−CrO 42−Compounds of NH 4+and the alkali metal cations−Permanganate MnO Cr O4 722−Compounds of NH 4+and the alkali metal cationsPhosphate PO 43−OH −+Compounds of NH 4 , the alkali metal cations,Ca 2+ , Sr 2+ , and Ba 2+Sulfate SO 42−Compounds of NH 4+ , the alkali metal cations,Sulfite SO 32−Ca 2+ , Sr 2+ , and Ba 2+ACTIvITYSERIESMetalLithiumPotassiumBariumCalciumSodiumMagnesiumAluminumManganeseZincChromiumIronCobaltNickelTinLead(Hydrogen)CopperMercurySilverPlatinumGold

STAAR CHEMISTRYREFERENCE MATERIALSPERIODIC TABLE OF THE ELEMENTS123456711A1H1.008Hydrogen22A3 4Li Be6.941 9.012Lithium Beryllium11 12Na Mg22.990 24.305Sodium Magnesium19 20K CaScTiVAtomic numberSymbolAtomic massCrMn14Si28.086Silicon3 4 5 6 7 8 93B 4B 5B 6B 7B8B21 22 23 24 25 26 2739.098 40.078 44.956 47.867 50.942 51.996 54.938 55.845 58.933Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt37 38 39 40 41 42 43 44 45Rb Sr Y Zr Nb Mo Tc Ru85.468 87.62 88.906 91.224 92.906 95.96 (98) 101.07 102.906Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium55 56 71 72 73 74 75 76 77Cs Ba Lu Hf Ta W Re Os132.905 137.328 174.967 178.49 180.948 183.84 186.207 190.23 192.217Cesium Barium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium87 88 103 104 105 106 107 108 109Fr Ra Lr Rf Db Sg Bh Hs Mt(223) (226) (262) (267) (268) (271) (272) (270) (276)LawrenciumFrancium Radium Rutherfordium Dubnium Seaborgium Bohrium Hassium MeitneriumFeCoRhI rName10 111B28NiPdPt29CuAgAu122B30ZnCdHg133AGaTl144AGePb155AAs166AIn Sn Sb Te IBiSePo177ABrAt188AHe4.003Helium5 6 7 8 9 10B C N O F Ne10.812 12.011 14.007 15.999 18.998 20.180Boron Carbon Nitrogen Oxygen Fluorine Neon13 14 15 16 17 18Al Si P S Cl Ar26.982 28.086 30.974 32.066 35.453 39.948Aluminum Silicon Phosphorus Sulfur Chlorine Argon31 32 33 34 35 3658.693 63.546 65.38 69.723 72.64 74.922 78.96 79.904 83.798Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton46 47 48 49 50 51 52 53 54106.42 107.868 112.412 114.818 118.711 121.760 127.60 126.904 131.294Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon78 79 80 81 82 83 84 85 86195.085 196.967 200.59 204.383 207.2 208.980 (209) (210) (222)Platinum Gold Mercury Thallium Lead Bismuth Polonium Astatine Radon110Ds111Rg(281) (280)Darmstadtium RoentgeniumMass numbers in parentheses are those ofthe most stable or most common isotope.2KrXeRnLanthanide SeriesActinide Series57La138.905Lanthanum89Ac(227)Actinium58Ce140.116Cerium90Th232.038Thorium59Pr140.908Praseodymium91Pa231.036Protactinium60Nd144.242Neodymium92U238.029Uranium61Pm(145)Promethium93Np(237)Neptunium62Sm150.36Samarium94Pu(244)Plutonium63Eu151.964Europium95Am(243)Americium64Gd157.25Gadolinium96Cm(247)Curium65Tb158.925Terbium97Bk(247)Berkelium66Dy162.500Dysprosium98Cf(251)Californium67Ho164.930Holmium99Es(252)Einsteinium68Er167.259Erbium100Fm(257)Fermium69Tm168.934Thulium101Md(258)Mendelevium70Yb173.055Ytterbium102No(259)NobeliumUpdated Spring 2011