practicecheexam2
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practicecheexam2

Course Number: CHEM 301, Fall 2011

College/University: Texas Brownsville

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1) Aflatoxin B1 (C17H12O6) is present in a blue mold that may grow on peanuts and rice stored improperly in humid conditions. The toxin affects the liver. In people who have been exposed to hepatitis aflatoxin is thought to be synergistic with the development of liver cancer. How many molecules are in 10 mg of aflatoxin B1? 2) By chemical analysis, the composition of calcium phosphate is 38.71% calcium, 20.00%...

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Aflatoxin 1) B1 (C17H12O6) is present in a blue mold that may grow on peanuts and rice stored improperly in humid conditions. The toxin affects the liver. In people who have been exposed to hepatitis aflatoxin is thought to be synergistic with the development of liver cancer. How many molecules are in 10 mg of aflatoxin B1? 2) By chemical analysis, the composition of calcium phosphate is 38.71% calcium, 20.00% phosphorous and 41.29% oxygen. Determine its empirical formula. 3) Balance the following equation and answer the questions below. A) FeS2 + O2 --> Fe2O3 + SO2 B) If 0.032 moles of FeS2 reacts completely. How many moles of SO2 will be formed? 4) Which of the following is not a unit-conversion factor for the reaction 2 Al(OH)3 + 3 H2SO4 ---> a. b. c. d. Al2(SO4)3 + 3 H2O ? 3 mol H2SO4 / 1 mol Al2(SO4)3 1 mol Al2(SO4)3 / 2 mol Al(OH)3 3 mol H2SO4 / 2 mole H2O 2 mol Al(OH)3 / 3 mol H2SO4 5) Consider the reaction below. Which statement correctly identifies the type of reaction that is occurring? MnO4- + 8 H+ + 5 e- ---> Mn2+ + 4 H2O a) b) c) d) e) The reaction is an example of a combustion. MnO4- is undergoing an oxidation. MnO4- is undergoing a reduction. The reaction is an example of a dehydrogenation. The reaction is not a balanced half-reaction. 6) Write the balanced equation for the complete combustion of D-mannoheptulose (C7H14O7) which is found in the fruit of the avocado tree. 7) A sample of gas has a volume of 505 mL at a pressure of 705 torr. What volume will the gas occupy at the same temperature but at 755 torr? 8) A mixture is made up of helium, nitrogen and oxygen. Their partial pressures are 311 torr, 0.200 atm, and 0.500 atm respectively. Calculate the total pressure of the mixture in atm. 9) How does temperature affect the solubility of gases in a liquid? Consider the solubility of a gas in water. What happens to the solubility as the temperature increases? A) the solubility of the gas increases. B) the solubility of the gas decreases. C) the solubility of the gas remains constant D) cannot be determined without additional information. 10) As the pressure of a gas at 760 torr is changed to 380 torr at constant temperature, the of volume the gas: a) increases b) decreases c) remaines the same d) cannot be determined 11) If the pressure of a sample of gas at 298 K is tripled, what will the new temperature be when the volume is kept constant? 12) Inhaled air contains O2 at a pressure of 160 torr. The capacity of a human lung is about 3.00 L. Body temperature is 37.0 oC. Calculate the mass of O2 in a lung after inspiration. 13) A 1.00 L sample of gas at 27.0 oC is heated so that it expands at constant pressure to a final volume of 1.50 L Calculate its final temperature. 14) If one serving of cake contains 10.0 mg of cholesterol, which is 0.0259 mmol, what is the formula mass in g/mol? 15) Which of the following reaction systems tends to become less random as reactants form products? A) I2 (s) + Cl2 (g) --> 2 ICl (g) B) 2 Mg (s) + O2 (g) --> 2 MgO (s) C) C (s) + O2 (g) --> CO2 (g) D) S (s) + O2 (g) --> SO2 (g) 16) Explain why CCl4 and C3H8 would or would not form a solution. 17) Water can be made to boil at 90oC by : A) decreasing the pressure with volume constant B) increasing the pressure with volume constant C) increasing the pressure while decreasing the volume D) decreasing the volume with pressure constant 18) Choose the correct sequence for arranging the following molecules in order of increasing boiling points: I. CH4 II. H2O III. NH3 A) B) C) D) E) II < I < III I < III < II II < III < I I < II < III none of the above 19) Which one or more of the following interactions occur between molecules of hydrogen (H2) A) ionic interactions B) London Dispersion forces C) Dipole-dipole interactions D) Hydrogen bonds 20) Molecules with large dipole moments are likely to: A) have lower melting points than molecules with no dipole moment B) have higher boiling points than molecules with no dipole moment C) exist as gases D) have high vapor pressures 21) For a liquid at its normal boiling temperature, which of the following vapor pressures is correct? A) 1 atm B) 2 atm C) 273 atm D) 760 atm 22) Solid sodium chloride has a melting point of 800 oC. This solid is an example of a: A) B) C) D) covalent crystal molecular crystal ionic crystal amorphous solid

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Texas Brownsville - CHEM - 301
1) Fill in the blank:a) The interaction between a solute and solvent is called _.b) The interaction between water and substances to form solutions is called_.2) The blood volume of an adult is 5.0 L. Blood alcohol levels of 0.50% v/v can cause acoma.
Texas Brownsville - CHEM - 301
1. a) Identify the two conjugate acid/base pairs in the following equilibrium:OH3COHH+H(aq)OHHOH+(l)Base (2)Conj. Acid (2)Acid (1)(aq)OH3CO(aq)Conj. Base (1)b) Draw arrows to show the movement of electrons from the base to the aci
Texas Brownsville - CHEM - 301
Chapter1TestStudyGuide1)Describethecharacteristicsofelements,compounds,andmixtures.a)Distinguishbetweenchemicalandphysicalproperties.b)Classifymixturesashomogeneousorheterogeneousandgiveexamplesofeach.c)Classifysubstancesaselements,compoundsormixtures
Texas Brownsville - CHEM - 301
Chapter2TestStudyGuide1)UseDalton'satomictheorytoexplaintheconstantcompositionofmatterandtheconservationofmass inchemicalreactions.a)Explainthemeaningofthe&quot;LawofConservationofMass&quot;.b)Explainthemeaningofthe&quot;LawofConstantComposition&quot;.c)Calculatethemass
Texas Brownsville - CHEM - 301
Chapter3TestStudyGuide1)Describethedifferencebetweenionicandcovalentbonds.a)Explainthenecessaryconditionsfortheformationofeachtypeofbond.b)Statetherelationshipbetweenionizationenergyandperiodicity.c)Writeionicchargesforallmaingroupelements.d)UseLewis
Texas Brownsville - CHEM - 301
Chapter4TestStudyGuide1)Calculatetheformulamassofacompound.a)Determinetheidentityandnumberofatomsofeachelementpresentinacompound.b)Usetheaboveinformation,inconjunctionwiththerelativemassesofeachelement,tocalculatethe formulamassofacompound.c)Convertf
Texas Brownsville - CHEM - 301
Chapter5TestStudyGuide1)Definegaspressureanditsunitsanddescribehowitismeasured.a)Explaintherelationshipbetweenareaandforceandhowthesetwofactorsdeterminethepressureofa gas.b)Statethevolumeoccupiedbyonemoleofanygasat0 Cand1atmpressure.c)Convertpressure
Texas Brownsville - CHEM - 301
Chapter6TestStudyGuide1)Usemolecularconceptstoexplainthepropertiesofthethreestatesofmatterandtransitionsbetween them.a)Stateandexplainthecharacteristicpropertiesofeachofthethreestatesofmatter.b)Explainwhysolidscannotbecompressedandholdtheirshapes,whil
Texas Brownsville - CHEM - 301
Chapter7TestStudyGuide1)Describehowtheformationofasolutiondependsonthemolecularpropertiesofthesoluteand solvents.a)Definetheterms&quot;solute&quot;,&quot;solvent&quot;,&quot;miscible&quot;and&quot;suspension&quot;.b)Nametheninetypesofmixturesthatcanbeformedfromthethreestatesofmatter.c)Expl
Texas Brownsville - CHEM - 301
Chapter8TestStudyGuide1)Describehowtheratesofchemicalreactionsareaffectedbytheconcentrationsofreactants,the temperature,andthepresenceofcatalysts.a)Writeamathematicalrepresentationfortherateofareaction.b)Statetheconditionsnecessaryfortheoccurrenceofac
Texas Brownsville - CHEM - 301
Chapter9TestStudyGuide1)Describethecentralroleofwaterinacidbasechemistry.a)Explainwhywatermoleculesarecapableofinteractingwitheachotherthroughhydrogenbonding.b)Explainhowprotontransferoccursbetweentwowatermoleculesandnametheresultingmolecular species.
Texas Brownsville - CHEM - 301
Chapter10TestStudyGuide1)Defineradioactivityanddescribetheprincipalkindsofnuclearemissions.a)Definetheterms:&quot;nucleons&quot;,&quot;nuclide&quot;,and&quot;radionuclide&quot;.b)Explainwhatradioactivityis.c)Listthemajortypesofradioactiveemissionsanddescribethecharacteristicsofeac
Texas Brownsville - CHEM - 301
Chapter11TestStudyGuide1)Defineorganicchemistry.a)Explaintheterm&quot;organicchemistry&quot;.b)Giveexamplesoforganiccompoundsandtherolestheyplayineverydaylife.c)Explainthedifferencebetweenmolecularandstructuralformulas.d)Explaintheterm&quot;combiningpower&quot;andlistth
Texas Brownsville - CHEM - 301
Chapter12TestStudyGuide1)Describethebondinginalkenes.a)Explainwhatadoublebondis.b)Writethegenericformulaforalkenes.c)Describethephysicalpropertiesofalkenes.d)Classifycompoundsasalkanes,alkenesorcycloalkanesbasedontheirmolecularformula.e)Describethed
Texas Brownsville - CHEM - 301
Chapter13TestStudyGuide1)Drawandnamealcohols.a)Explainthestructuralrelationsbetweenalcohols,phenolsandethers.b)Classifycompoundsasalcohols,phenolsorethers.c)Drawconstitutionalisomersofalcohols.d)Writethegeneralformulasforalcohols.e)Classifyalcoholsa
Texas Brownsville - CHEM - 301
Chapter14TestStudyGuide1)Drawandnamealdehydesandketones.a)Describethedifferencebetweenaldehydesandketones.b)Classifycompoundsasaldehydesorketones.c)Writethegeneralmolecularformulaforaldehydesandketones.d)Drawstructuralformulasforaldehydesandketonesan
Texas Brownsville - CHEM - 301
Chapter15TestStudyGuide1)Drawandnamecarboxylicacidsandtheirderivatives(esters,acidanhydrides,andacidhalides).a)Drawgenericstructuralformulasforcarboxylicacids,esters,acidanhydrides,amides,andacid halides.Describethedifferencesbetweenthem.b)Classifycom
Texas Brownsville - CHEM - 301
Chapter16TestStudyGuide1)Drawandnameamines.a)Listandexplainthedifferencesbetweenaminesandamides.b)Classifycompoundsasaminesoramides.c)Classifyaminesasprimary,secondaryortertiary;andasaromaticoraliphatic.d)Drawconstitutionalisomersofamines.e)Selectan
Texas Brownsville - CHEM - 301
Chapter17TestStudyGuide1)Distinguishbetweenconstitutionalisomersandstereoisomers.a)Explainthedifferencebetweenconstitutionalisomersandstereoisomers.b)Definetheterm&quot;conformation&quot;.c)Describethedifferencebetweenenantiomersanddiastereomers.d)Listthecondi
Texas Brownsville - CHEM - 301
Chapter18TestStudyGuide1)Definethescopeofbiochemistry.a)Explaintheterm&quot;biochemistry&quot;.b)Describetheareasofbiochemistryemphasizedinthetext.2)Describethebiologicalrolesofcarbohydratesanddistinguishbetweenmonosaccharides, oligosaccharides,andpolysacchari
Texas Brownsville - CHEM - 301
Chapter19TestStudyGuide1)Drawthestructuresanddescribethephysicalpropertiesofsaturatedandunsaturatedfattyacids.a)Definetheterm&quot;lipid&quot;.b)Listthefivemajorclassesoflipidsandgiveanexampleofthefunctionofeachclass.c)Explainthedifferencebetweenhydrolyzablelip
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