thepage="Calc Eo(141)" //11/18/02-updated netscape 7 //global variables refnumber=185 corrt=0 tried=0 totl=0 theanswer=0 which=0 thecmpds="" hrxn="" attempts=0 first=3 second=0 option=0 potentials="" thecell="" thebutton="" halfrxn=new Array() halfrxn[0]=new Array("F2","F-",2,3.06) halfrxn[1]=new Array("F2O","F-",4,2.1) halfrxn[2]=new Array("O3","O2",2,2.07) halfrxn[3]=new Array("S2O8-2","SO4-2",2,2.01) halfrxn[4]=new Array("NO3-","NO2",1,1.80) halfrxn[5]=new Array("MnO4-","Mn+2",5,1.69) halfrxn[6]=new Array("ClO2-","ClO-",2,1.64) halfrxn[7]=new Array("BrO3-","Br2",10,1.52) halfrxn[8]=new Array("PbO2","Pb+2",2,1.455) halfrxn[9]=new Array("Au+3","Au+",2,1.41) halfrxn[10]=new Array("Cl2","Cl-",2,1.36) halfrxn[11]=new Array("Cr2O7-2","Cr+3",6,1.33) halfrxn[12]=new Array("MnO2","Mn+2",2,1.23) halfrxn[13]=new Array("IO3-","I2",10,1.20) halfrxn[14]=new Array("ClO4-","ClO3-",2,1.19) halfrxn[15]=new Array("Br2","Br-",2,1.087) halfrxn[16]=new Array("VO2+","VO+2",1,1.00) halfrxn[17]=new Array("HNO2","NO",1,.99) halfrxn[18]=new Array("NO3-","NO",3,.96) halfrxn[19]=new Array("ClO2","ClO2-",1,.954) halfrxn[20]=new Array("HgO","Hg",2,.926) halfrxn[21]=new Array("Ag+","Ag",1,.7995) halfrxn[22]=new Array("Fe+3","Fe+2",1,.771) halfrxn[23]=new Array("Hg+2","Hg2+2",2,.92) halfrxn[24]=new Array("ClO-","Cl-",2,.89) halfrxn[25]=new Array("AsO2-","As",3,.68) halfrxn[26]=new Array("I2","I-",2,.628) halfrxn[27]=new Array("MnO4-","MnO2",3,.588) halfrxn[28]=new Array("Sb2O5","SbO+",4,.559) halfrxn[29]=new Array("I3-","I-",2,.545) halfrxn[30]=new Array("VO+2","V+3",1,.337) halfrxn[31]=new Array("UO2+2","U+4",2,.334) halfrxn[32]=new Array("BiO+","Bi",3,.32) halfrxn[33]=new Array("PbO2","PbO",2,.28) halfrxn[34]=new Array("SbO+","Sb",3,.212) halfrxn[35]=new Array("Mo+3","Mo",3,.20) halfrxn[36]=new Array("SO4-2","SO2",2,.17) halfrxn[37]=new Array("Sn+4","Sn+2",2,.154) halfrxn[38]=new Array("Sb2O3","Sb",6,.152) halfrxn[39]=new Array("TiO+3","Ti+3",1,.10) halfrxn[40]=new Array("Sn+2","Sn",2,.01) halfrxn[41]=new Array("H+","H2",2,0) halfrxn[42]=new Array("GeO2","GeO",2,-.118) halfrxn[43]=new Array("H3PO3","H3PO2",2,-.50) halfrxn[44]=new Array("SO3-2","S2O3-2",4,-.58) halfrxn[45]=new Array("H3BO3","B",3,-.87) halfrxn[46]=new Array("Cr+2","Cr",2,-.91) halfrxn[47]=new Array("Al+3","Al",3,-1.66) halfrxn[48]=new Array("Th+4","Th",4,-1.90) halfrxn[49]=new Array("Mg+2","Mg",2,-2.37) halfrxn[50]=new Array("Be2O3-2","Be",4,-2.62) choice=new Array() choice[0]=new Array("I","II","Ered I-Ered II",0,1) choice[1]=new Array("II","I","Ered II-Ered I",1,0) ansphrase=new Array("The half reactions (both written as reductions) are as shown below.
","The overall reaction is written such that reaction "," is the reduction and reaction "," is the oxidation.
Therefore, the overall Eo is:
") function startit(){ clear() thedata=new Array() totl++ document.forms[0].total.value=totl document.forms[0].results.value="" first=Math.floor(Math.random()*halfrxn.length) second=first while(second==first)second=Math.floor(Math.random()*halfrxn.length) getcmpds(first,second) theE=number(halfrxn[first][3]-halfrxn[second][3],3,3) reaction="" reaction="What is Eo for the following?
"+thecmpds[1]+" + "+thecmpds[2]+" => "+thecmpds[3]+" + "+thecmpds[4]+"
" showquest(reaction) buildanswer() } function getcmpds(first,second){ hrxn=new Array() thecmpds=new Array() option=Math.floor(2*Math.random()) option=1 if(option==0){ thecmpds[1]=completeformula(halfrxn[first][0]) thecmpds[2]=completeformula(halfrxn[second][1]) thecmpds[3]=completeformula(halfrxn[first][1]) thecmpds[4]=completeformula(halfrxn[second][0]) electrons=new Array(halfrxn[first][2],halfrxn[second][2]) potentials=new Array(halfrxn[first][3],halfrxn[second][3]) hrxn[1]="(I)"+thecmpds[1]+"+"+electrons[0]+"e- =>"+thecmpds[3]+" E½="+potentials[0]+"
" hrxn[2]="(II)"+thecmpds[4]+"+"+electrons[1]+"e- => "+thecmpds[2]+" E½="+potentials[1]+"
" } else{ thecmpds[2]=completeformula(halfrxn[first][0]) thecmpds[1]=completeformula(halfrxn[second][1]) thecmpds[4]=completeformula(halfrxn[first][1]) thecmpds[3]=completeformula(halfrxn[second][0]) electrons=new Array(halfrxn[second][2],halfrxn[first][2]) potentials=new Array(halfrxn[second][3],halfrxn[first][3]) hrxn[1]="(I)"+thecmpds[3]+"+"+electrons[0]+"e- =>"+thecmpds[1]+" E½="+potentials[0]+"
" hrxn[2]="(II)"+thecmpds[2]+"+"+electrons[1]+"e- => "+thecmpds[4]+" E½="+potentials[1]+"
" } } function getn(second,second){ gain=halfrxn[first][2] lost=halfrxn[second][2] if(gain==lost)return gain; else if(gain%lost==0)return gain; else if(lost%gain==0)return lost; else { while(gain%2==0 & lost%2==0){gain=gain/2;lost=lost/2} while(gain%3==0 & lost%3==0){gain=gain/3;lost=lost/3} ne=gain*halfrxn[second][2] return ne } } function buildanswer(){ theanswer=ansphrase[0]+hrxn[1]+hrxn[2]+ansphrase[1]+choice[option][0]+ansphrase[2]+choice[option][1]+ansphrase[3]+choice[option][2]+"="+potentials[choice[option][3]]+"-"+potentials[choice[option][4]]+"="+theE } function answer(ans){ if(tried==1)alert("You've done this one. Get a new problem."); else{ if(tried==2){totl++;document.forms[0].total.value=totl} right=0 attempts++ if(theE<0){ if(ans>.95*theE || ans<1.05*theE){ right++ } } else{ if(ans<.95*theE || ans>theE){ right++ } } if(right==0){ tried=1 corrt++ document.forms[0].results.value="correct" document.forms[0].correct.value=corrt } else{ tried=2 document.forms[0].results.value="incorrect" } }} stringlist="0123456789" signlist="+-" function constants(){ var cont=window.open("","cont","toolbar=yes,scrollbars=yes,width=300,height=300") cont.document.writeln (""); cont.document.writeln ("Ionization Constants"); cont.document.writeln (""); cont.document.writeln ("Potentials for abbreviated half reactions
"); for(k=0;k"); } cont.document.writeln("
",completeformula(halfrxn[k][0]),"=>",completeformula(halfrxn[k][1])," Eo=",halfrxn[k][3],"V
"); cont.document.writeln(""); cont.document.close(); cont.focus(); }