thepage="Nomenclature - Names to Formulas"
//11/20/02-updated netscape 7
//refnumber=136
attempts=0
tried=0
totl=0
corrt=0
anpre=""
catpre=""
theformula=""
thesolution=""
newone=""
ansphrase=new Array()
anion=new Array();
cation=new Array();
cation[0]=new Array("lithium","Li",1)
cation[1]=new Array("beryllium","Be",2)
cation[2]=new Array("potassium","K",1)
cation[3]=new Array("calcium","Ca",2)
cation[4]=new Array("sodium","Na",1)
cation[5]=new Array("magnesium","Mg",2)
cation[6]=new Array("cesium","Cs",1)
cation[7]=new Array("barium","Ba",2)
cation[8]=new Array("rubidium","Rb",1)
cation[9]=new Array("strontium","Sr",2)
cation[10]=new Array("aluminum","Al",3)
cation[11]=new Array("ammonium","NH4",1)
cation[12]=new Array("carbon","C",4)
cation[13]=new Array("silicon","Si",4)
cation[14]=new Array("phosphorus","P",3)
cation[15]=new Array("phosphorus","P",5)
cation[16]=new Array("boron","B",3)
cation[17]=new Array("sulfur","S",4)
cation[18]=new Array("sulfur","S",6)
cation[19]=new Array("nitrogen","N",3)
cation[20]=new Array("titanium","Ti",4,3)
cation[21]=new Array("vanadium","V",5,4,3,2)
cation[21]=new Array("chromium","Cr",6,3,2)
cation[22]=new Array("manganese","Mn",6,4,3,2)
cation[23]=new Array("iron","Fe",3,2)
cation[24]=new Array("cobalt","Co",3,2)
cation[25]=new Array("nickel","Ni",2,3)
cation[26]=new Array("copper","Cu",2,1)
cation[27]=new Array("niobium","Nb",5,3)
cation[28]=new Array("molybdenum","Mo",6,5,4,3,2)
cation[29]=new Array("ruthenium","Ru",6,4,3,2)
cation[30]=new Array("rhodium","Rh",2,3,4)
cation[31]=new Array("palldium","Pd",4,2)
cation[32]=new Array("tin","Sn",4,2)
cation[33]=new Array("tungsten","W",6,5,4,3,2)
cation[34]=new Array("rhenium","Re",6,4,2)
cation[35]=new Array("osmium","Os",6,4,3,2)
cation[36]=new Array("iridium","Ir",6,4,3,2)
cation[37]=new Array("platinum","Pt",4,2)
cation[38]=new Array("gold","Au",3,1)
cation[39]=new Array("mercury","Hg",2,1)
cation[40]=new Array("thallium","Tl",3,1)
cation[41]=new Array("lead","Pb",4,2)
anion[0]=new Array("oxide","O",2)
anion[1]=new Array("fluoride","F",1)
anion[2]=new Array("sulfide","S",2)
anion[3]=new Array("chloride","Cl",1)
anion[4]=new Array("selenide","Se",2)
anion[5]=new Array("bromide","Br",1)
anion[6]=new Array("iodide","I",1)
anion[7]=new Array("carbonate","CO3",2)
anion[8]=new Array("hydroxide","OH",1)
anion[9]=new Array("nitrate","NO3",1)
anion[10]=new Array("nitrite","NO2",1)
anion[11]=new Array("sulfate","SO4",2)
anion[12]=new Array("sulfite","SO3",2)
anion[13]=new Array("cyanide","CN",1)
anion[14]=new Array("permanganate","MnO4",1)
anion[15]=new Array("dichromate","Cr2O7",2)
anion[16]=new Array("phosphate","PO4",3)
anion[17]=new Array("perchlorate","ClO4",1)
anion[18]=new Array("hydrogen carbonate","HCO3",1)
anion[19]=new Array("chlorite","ClO2",1)
anion[20]=new Array("thiosulfate","S2O3",2)
anion[21]=new Array("hypochlorite","ClO",1)
anion[22]=new Array("chlorate","ClO3",1)
anion[23]=new Array("phosphite","PO3",3)
anion[24]=new Array("chromate","CrO4",2)
anion[25]=new Array("acetate","C2H3O2",1)
anion[26]=new Array("oxalate","C2O4",2)
anion[27]=new Array("silicate","SiO3",2)
anion[28]=new Array("borate","BO3",3)
anion[29]=new Array("hydrogen sulfite","HSO3",1)
anion[30]=new Array("hydrogen sulfate","HSO4",1)
anion[31]=new Array("hydrogen phosphate","HPO4",2)
anion[32]=new Array("dihydrogen phosphate","H2PO4",1)
thestock=new Array("","(I) ","(II) ","(III) ","(IV) ","(V) ","(VI) ","(VI) ","(VII) ")
thepres=new Array("","mono","di","tri","tetra","penta","hexa","hepta","octa","nona")
numstring="0123456789"
function process(formula){
	newformula=""
	for(j=0;j<formula.length;j++){
		numstring.indexOf(formula.charAt(j))>0?newformula+="<sub>"+formula.charAt(j)+"</sub>":newformula+=formula.charAt(j)};
	return newformula
}
function startit(){
	clear()
	totl++
	document.forms[0].total.value=totl
	cat=Math.floor(20*Math.random())
	if(cat>11) ani=Math.ceil(6*Math.random());
	else ani=Math.floor(anion.length*Math.random());
	if((cat==17 || cat==18)& ani==2){totl--;startit()}
	else{
	cat<19?x=cation[cat][2]:x=cation[cat][2+Math.floor(Math.random()*(cation[cat].length-2))];
	y=anion[ani][2]
	if(x==y){
		csub=1
		asub=1
	}
	if(x>y){
	if(x%y==0){
		csub=1
		asub=Math.ceil(x/y)
	}
	else{
	 	csub=y
		asub=x
		}
	}
	else{
	if(y%x==0){
		csub=Math.ceil(y/x)
		asub=1	
	}
	else{
	 	csub=y
		asub=x
	    }
	}
	formula=""
	if(cat!=11)csub==1?formula+=cation[cat][1]:formula+=cation[cat][1]+csub;
	else csub==1?formula+=cation[cat][1]:formula+="("+cation[cat][1]+")"+csub;
	if(asub==1)formula+=anion[ani][1];
	else ani<7?formula+=anion[ani][1]+asub:formula+="("+anion[ani][1]+")"+asub;
	anpre=catpre=""
	if(asub==1 & ani==0)anpre="mon";
	else if(asub>1 & cat>11)anpre=thepres[asub];
	if(cat>11 & csub>1)catpre=thepres[csub];
	thename=catpre+cation[cat][0]+ "  " + anpre + anion[ani][0]
	firstpart=catpre + cation[cat][0]
	secpart=anpre + anion[ani][0]
	if(cat>19)thename=getstock(cat,ani,x)
	showquest(thename)
	buildanswer()
}}
function getstock(cat,ani,x){
	thename=cation[cat][0]+thestock[x]+anion[ani][0]
	return thename
}
function buildanswer(){
	if(cat>19)thesolution="Since the cation "+cation[cat][1]+" has a charge of "+x+"+ and the "+anion[ani][0]+" has a charge of "+anion[ani][2]+"- , they will combine in a "+csub+":"+asub+" ratio and the formula is :"+process(formula);
	else{
		if(cat<12)thesolution= "Since the "+cation[cat][1]+" can only have a charge of "+cation[cat][2]+"+ and the "+anion[ani][0]+" has a charge of "+anion[ani][2]+"- , they will combine in a "+csub+":"+asub+" ratio and the formula is :"+process(formula);
		else thesolution="The prefixes give a ratio of "+cation[cat][0]+" to "+anion[ani][0]+" of "+csub+":"+asub+" and a formula of :"+process(formula);	
	}
	theanswer=thesolution
} 
function previewit(test){
	if(thisbrowser=="IE"){
		qspot.innerHTML=test
		}
	else{
		if(thisbrowser=="NN4"){
		document.qspot.document.open()
		document.qspot.document.write(test)
		document.qspot.document.close()
		}
		else{
			document.getElementById("qspot").innerHTML=test
			}
		}
}	
function answer(ans){
	if(tried==1)alert("You've already done this one. Get a new problem");
	else{
		attempts++
		if(tried==2){totl++;document.forms[0].total.value=totl}
		if (ans==formula){
			document.forms[0].results.value="correct"
			corrt++
			document.forms[0].correct.value=corrt
			tried=1
		}
		else{
			document.forms[0].results.value="incorrect"
			tried=2
		}
	}
}