[KACT] Re: help!!

  • From: David Kadavy <dkadavy@xxxxxxxxxxxxxxxx>
  • To: <kact@xxxxxxxxxxxxx>
  • Date: 13 Jan 2006 10:42:06 -0600

Try using money.  Give three students each a  $5 bill and two students a $1 
bill.  Tell them this is a synthesis reaction so they are to get together to 
purchase a six dollar item.  Ask them if it is the $5 bill or the $1 bill that 
limits how  many items( the synthesis product) they can buy together.  They 
tend to understand money.  This in some sense helps them to understand 
stoichiometry and the proportions.

David Kadavy

On 1/13/2006 10:04 AM, Kelly Deters <kellymdeters@xxxxxxxxx> wrote:
>I, too, use the recipe example...so I can't give much help with a 
>different approach.
>For limiting reactants, I use the "sandwhich" example.  If it takes 
>2 pieces of bread, 2 piece of cheese and 3 pieces of meat to have 
>a sandwhich, how many sandwiches can you make if you have...(and 
>then give a bunch of examples).  Or you can use the brat example 
>(brats come in packages of 5, hot dog buns in packages of 8...what's 
>the limiting reactant).  Those two have cleared up limiting reactants 
>for most any student I've explained them to...but that's assuming 
>you've already worked through the "muck" of stoichioemtry to begin 
>Maybe somebody will have another idea.
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