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The Modern View of Atomic Structure; Atomic | Ch 2 - 35E

Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 35E Chapter 2

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 35E

The Modern View of Atomic Structure; Atomic Weights (Sections)Naturally occurring magnesium has the following isotopic abundances:IsotopeAbundance (%)Atomic mass (amu)24Mg78.9923.9850425Mg10.0024.9858426Mg11.0125.98259(a) What is the average atomic mass of Mg? (b) Sketch the mass spectrum of Mg.

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SarahStewart BIOL1040 Exam3notes Chapter43:ReproductionandEmbryonicDevelopment Lecturegiven3/29/16 HumanReproduction: • Bothspeciesmusthaveasetofgonads,ductsforgametetransport,and structuresforcopulation MaleReproduction: • Testesproducespermandmalehormones • Epididymisstoresspermastheydevelop • Multipleglandscontributetosemen:theseminalvesicles,theprostategland, andthebulbourethralglands • Duringejaculation:spermisexpelledfromthepenis,glandssecreteintothe urethra,andsemenisformedandexpelled • Spermproductionisregulatedbyanegativefeedbacksystem • Involvesthehypothalamus,anteriorpituitary,andthetestes • Testesistheorganaffectedbythesehormones;producespermandandrogens (sexhormonesthatcauselowervoice)oncemalereachespuberty • LHistheluteinizinghormonethatactsuponthecellsinthetestes,andFSHisthe folliclestimulatinghormonethatmakesthetestesproducetestosterone;these twohormonescomefromthefemalereproductivesystem FemaleReproduction: • Meanttocarryapregnancy SarahStewart BIOL1040 Exam3notes • Hormonessynchronizecyclicchangesintheovaryanduterus,approximately every28days;canbesynchronizedwithotherfemales • Thiscycle’spurposeistoprepareawomenforapregnancy,greatvariation betweeneverywoman • ThehypothalamussignalstheanteriorpituitarytosecreteFSHandLH o LH–stimulatesgrowthoffollicle,promotesovulationanddevelopment ofcorpusluteum o FSH–stimulatesgrowthoffollicle • Triggerthegrowthofanovarianfollicleandovulation • Afterovulation,thefolliclebecomesthecorpusluteum • Thecorpusluteumsecretsestrogenandprogesteronewhich o Stimulatetheendometrium(uterinelining)tothicken o Preparetheuterusforimplantation o Inhibitthehypothalamus,whichreducesFSHandLH–negativefeedback loop • Onlyabout30%ofimplantationsaresuccesses,mostimportanttimeinthe reproductivecycle • Iftheeggisfertilized,embryoreleaseshormonesthatmaintaintheuterine lining:menstruationdoesnotoccur o Embryonicstageisthefirstthreemonthsofpregnancy SarahStewart BIOL1040 Exam3notes o Remaining2stagesarethefetaldevelopmentstage,embryobegins takingonhumancharacteristics • Iftheeggisnotfertilized,thedropinLHshutsdownthecorpusluteumandits hormones;menstruationistriggeredandthehypothalamusandpituitaryforma newfollicle–estrogen/progesteronenolongerinhibitingthis MenstrualCycle • Beginswithovulation;generallyoccursaroundday14 • LHandFHSlevelsspike,whichstimulatesthefollicletobereleasedandtogrow • Thefolliclegrowsandsecretesestrogen;oncethecorpusluteumisformedby thefollicle,itsecretesprogesteroneandestrogen • Estrogenandprogesteronepromotetherapidthickeningoftheuterinewall o Estrogen-lowlevelsinhibitpituitary,highlevelsstimulatehypothalamus o Progesterone–maintainendometrium,highlevelsinhibithypothalamus andpituitary–sharpdropspromotemenstruation • Iftheeggisnotfertilized,theliningissloughedoffandthisiswhatcauses menstrualbleeding Chapter45:PopulationandCommunityEcology Lecturegiven3/31/16 • Populationecologyisconcernedwithchangesinpopulationsizeandfactorsthat regulatepopulationsovertime,suchasimmigrationandemigration o Toomanypeopleonthisearthtomaintainasustainableenvironment SarahStewart BIOL1040 Exam3notes • Populationsincreasethroughbirthandimmigrationtoanareaanddecrease throughdeathandemigrationoutofanarea Population–agroupofindividualsofasinglespeciesthatoccupythesamegeneral area;fromareproductiveviewitisagroupofindividualsthatsharecommongenepool Populationdynamics–theinteractionsbetweenthebiotic(living)andabiotic(nonliving) factorscausesvariationinpopulationsizes • Individualsinapopulationrelyonthesameresources,areinfluencedbythe sameenvironmentalfactors,andarelikelytointeractandbreedwitheachother • Populationmaybedescribedbythenumberanddistributionofindividuals • 46.2millionlivinginpovertyintheUS(below$27,000)–mostresourcesare consumedbyrelativelyfewpeopleindevelopedcountries Populationdensity–thenumberofindividualsofaspeciesperunitareaorvolume;i.e. numberofoaktreespersquarekilometerinaforest • Ecologistsuseavarietyofsaplingtechniquestoestimatepopulationdensities, notalwayseasytodetermine • Animalsmovearoundanddensitiesvaryinapopulation’srange,soyoucantbe completelyconfidentinadensitynumber Capture-recapture–samplingmethodthatmakestheassumptionsthatmarkinghasno effectonmortality,markinghasnoeffectonthelikelihoodofbeingcaptured,andthat thereisnoimmigrationoremigrationbetweenthesamplingtimes SarahStewart BIOL1040 Exam3notes Dispersionpattern–thewayindividualsarespacedwithinanarea;canbeclumped, nearlyuniform,orrandom Lifehistorypattern–asetofadaptionsthatinfluencesurvival,fertility,andtheageat firstreproduction;asetofconditionspertainingtoanindividual’sscheduleof reproduction,summarizedinlifetables/survivorshipcurves • Lifetables o Trackage-specificpatterns o Populationdividedintoagecategories o Birthandmortalityratescalculatedforeachagecategory o Eachspecieshasacharacteristiclifespan,notallachieveit • Survivorshipcurves–usedtoplotacohort’sage-specificsurvivalinahabitat o TypeI–highsurvivorshipuntillateinlife,thenalargeincreaseindeath; elephants,humans o TypeII–reflectafairlyconstantdeathrateatallages;lizards,small mammals,largebirds o TypeIII–deathratehighestearlyon,speciesthatproducemanysmall offspringanddolittleparenting;invertebrates

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Chapter 2, Problem 35E is Solved
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Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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The Modern View of Atomic Structure; Atomic | Ch 2 - 35E