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MCAT (C&P, B&S and P&S )Review (Examkrackers Exam 1) With Correct Answers.
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MCAT (C&P, B&S and P&S )Review (Examkrackers Exam 1) With Correct Answers.
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MCAT (C&P, B&S and P&S )Review
(Examkrackers Exam 1) With Correct
Answers
Increasing nnthe nnmolarity nnof nnan nnionic nnsolution nn- nnANSWER: nn✔ nnIncreases nnthe nnability nnof nnthe
nnsolution nnto nnconduct nnelectricity nnb/c nnsolns nncontaining nndissolved nnsalts nnrelease nncharged nnparticles
nninto nnsolution nnthat nncan nncarry nnan nnelectric nncurrent
The nnhighest nnmeasured nncurrent nnat nna nngiven nnvoltage nnduring nnthe nnexp. nnwould nnmost nnlikely nnbe
nnproduced nnby nnpBS nnwith nnwhich nnmass nnratio nnof nnNaCl, nnKCl nnand nnNa2HPO4? nn- nnANSWER: nn✔ nn1.5:0.5:1
Q nnis nnasking nnwhich nnratio nnof nnPBS nnby nnmass nnwould nnmake nna nnsolution nnof nnthe nngreatest nnmolarity. nn
Na2HPO4 nndoesn't nndissociate nnso nncan nnbe nndisregarded nnin nncomparing nnmolarities. nn
For nnany nnequal nnmass nnof nneach nnsalt, nnNaCl nnwill nnalways nnprovide nnmore nnmoles. nnQ nnboils nndown nnto
nnwhich nnof nnthese nnmixtures nnhas nnmore nnNaCl nnpresent. nn
PBS nnalready nnhas nna nnset nnmass nnof nnNacl, nnKCl nnand nnNa2HPO4 nnso nnthe nnmass nnratio nnis nnof nnmass nnof
nneach nnsalt nncompared nnto nnthe nntotal nnmass nnof nnPBS. nnNaCl nnwill nnalways nnproduce nnmore nnmoles nnwhen
nnits nnmolar nnmass nnis nnmultiplied nnby nnan nnequal nnmass.
What nnare nncharge nncarriers nnin nnelectric nncircuits? nn- nnANSWER: nn✔ nnA nncharge nncarrier nnis nna nnparticle nnthat
nnis nnfree nnto nnmove, nncarrying nnan nnelectric nncharge, nnesp. nnthe nnparticles nnthat nncarry nnelectric nncharges nnin
nnelectrical nnconductors. nnCharge nncarriers nnare nndifferent nnfrom nnelectron nntransporters.
After nnadding nnthe nnsodium nnacetate nnsoln, nnan nnincreased nnamplitude nnin nnthe nncurrent nnreading nnwas
nnobserved. nnWhich nnof nnthe nnfollowing nnbest nnexplains nnthis nnphenomenon? nn- nnANSWER: nn✔ nnNaCH3COO
nnalmost nncompletely nnionizes, nnproviding nnmore nncharge nncarriers nnin nnthe nnsoln. nnIncreasing nnthe nnnumber
nnof nncharge nncarriers nnin nnthe nnsoln nncauses nnan nnincreased nnamplitude nnin nnthe nncurrent nnreading.
If nnthe nnlab nnran nnout nnof nnethanol, nnwhich nnof nnthe nnfollowing nnchemicals nnwould nnbe nnmost nnappropriate
nnto nnuse nnfor nnthe nnprecipitation nnprocedure? nn- nnANSWER: nn✔ nnPropanol. nn
Whole nnpoint nnof nnusing nnethanol nnis nnto nnprecipitate nnDNA nnb/c nnthe nnadded nnsodium nnacetate nnintroduces
nnNa+ nnions nnthat nninteract nnwith nnDNA's nnnegatively nncharged nnphosphate nnbackbone, nnleaving nnthe nnDNA
nntoo nnpolar nnto nnremain nnsoluble nnin nnthe nnsubstantially nnless nnpolar nnethanol nnsoln. nnEthanol nnis nnmiscible
, nnwith nnwater nnand nnwon't nnform nntwo nnphases. nnIts nnaddition nnserves nnto nnreduce nnthe nnpolarity nnof nnthe
nnsolution. nn
So nnwe nnneed nna nnmolecule nnthat's nnmiscible nnwith nnwater nnbut nnalso nnnon-polar nnenough nnto nnprecipitate
nnDNA. nnPropanol nnis nnmost nnsimilar nnto nnethanol
If nnthe nnexp nnin nnFigure nn1 nnwas nnrepeated nnwith nnN2, nnwould nnit nngive nna nndifferent nnresult nnthan nnhaving
nnused nnCO2? nn- nnANSWER: nn✔ nnYes, nnnitrogen nnwould nnbehave nndifferently nnb/c nnof nnthe nnalready nnhigh
nnquantities nnof nnnitrogen nnin nnthe nnair. nnNitrogen nnmakes nnup nnthe nnlargest nnproportion nnof nnthe nngases nnin
nnthe nnair nnof nnaround nn75%. nnReleasing nn6000 nnppm nnof nnnitrogen nninto nna nnroom nnwould nnnot nndetectably
nnincrease nnthe nnpartial nnpressure nnof nnnitrogen. nnThere nnwould nnthen nnbe nnless nnof nna nnconcentration
nngradient nnfor nnnitrogen nnto nndiffuse nndown nnso nnthe nnconcentration nnwould nnsimply nnremain nnconstant.
nnThe nnother nngases nnlisted nnwould nndisplay nnthe nnsame nnbehavior nnof nndiffusing nnout nnof nnthe nnroom.
Ethanamide nnundergoes nnhydrolysis nnin nna nntest nntube nncontaining nna nnsolution nnwith nna nnpH nnof nn11.
nnWhich nnof nnthe nnfollowing nndescribes nnwhat nnwould nnhappen nnif nna nnstrip nnof nnmoist nnlitmus nnpaper nnwas
nnheld nnabove nnthe nntest nntube? nn- nnANSWER: nn✔ nnAmides nnin nnalkaline nnconditions nnwould nnundergo
nnhydrolysis nnto nnform nnammonia nnand nnthe nnsalt nnof nnthe nncorresponding nnacid, nnthe nnethanoic nnacid. nnThe
nnammonia nngas nnwould nnthen nnbubble nnout nnof nnthe nnliquid nnsolution. nnAmmonium nnion nnwould nnbe
nnproduced nnonly nnif nnthe nnamide nnwere nnhydrolyzed nnin nnacidic nnconditions. nnPhysically nnwrite nnout nnthe
nneq. nnif nnthe nnquestion nngives nnyou nna nnreaction.
Effect nnof nndecreasing nnthe nnvolume nnof nnthe nnsystem nn- nnANSWER: nn✔ nn- nnfavors nnthe nnside nnof nnthe
nnequilibrium nnwith nnfewer nnmoles nnof nngas nnb/c nnthe nnpressure nnwill nnincrease
What nnwould nndecreasing nnthe nntemp. nnof nna nnrxn nnwith nnpositive nnenthalpy nnmean? nn- nnANSWER: nn✔ nn-
nnremoving nna nnreactant nnb/c nnheat nnin nna nnrxn nnwith nnpositive nnenthalpy nnmeans nnthat nnheat nnis nnon nnthe
nnreactant nnside
What nnis nnconsidered nna nnsmall nnsample nnsize? nn- nnANSWER: nn✔ nnFor nndata nnthat nnisn't nnskewed: nna nnsmall
nnsample nnsize nnnormally nn< nn10 nnis nnsufficient nn
For nndata nnthat nnis nnmoderately nnskewed: nnn>=25 nn(central nnlimit nntheorem) nnand nnmay nnneed nnan nneven
nnlarger nnsample nnsize nnif nnthe nndata nnis nnhighly nnskewed
Factors nnthat nnaffect nnacid nnstrength nn- nnANSWER: nn✔ nnIntramolecular nnforces nn(NOT nnintermolecular
nnforces) nninfluence nnacid nnstrength nn