[KACT] Re: help!!

  • From: "Stockam, Angela" <adiskin@xxxxxxxxxx>
  • To: <kact@xxxxxxxxxxxxx>
  • Date: Fri, 13 Jan 2006 10:13:48 -0600

I use the recipe example also.  But, before at the very beginning of the
unit I have the students read the "Stoichiometry Fairytale Kingdom."
Sometimes I have them work in groups and build a model of the kingdom
that is described in the fairytale and sometimes I have them make a
painting of it.  The fairytale is great because it helps them sequence
in their minds the process of doing mass-mass calculations.  
After they have the story in their mind - the calculations don't seem so
ominous to them - then I introduce the recipe analogy.


From: kact-bounce@xxxxxxxxxxxxx [mailto:kact-bounce@xxxxxxxxxxxxx] On
Behalf Of London Reif
Sent: Friday, January 13, 2006 8:24 AM
To: kact@xxxxxxxxxxxxx
Subject: [KACT] help!!

Okay everyone I need some help here!
We are to the stoichiometry chapter in chemistry.  I tried to introduce
the chapter by putting a recipe on the board and asking how much of each
ingredient we would need to double the recipe, half the recipe, and so
on.  Then I tried to use the same analogy to move to chemical equations.
So far we have talked about mole-mole problems, and mass-mass problems.
Some students still cannot make the transition from the recipe idea to
the chemical equation idea.  
How do you all introduce it? Do you have any little tricks to help the
students better understand the concept?  Thanks for your input.
London Reif
Hoisington High School

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