Low Budget
Manipulatives
to
Improve Teaching
Stoichiometry
H
H
N
H
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A man was out walking in the desert
when a voice said to him, "Pick up
some pebbles and put them in your
pocket, and tomorrow you will be both
happy and sad."
The man obeyed. He stooped down
and picked up a handful of pebbles
and put them in his pocket. The next
morning he reached into his pocket
and found diamonds, sapphires,
rubies and emeralds.
And he was both happy and sad.
Happy he had taken some - sad that
he hadn't taken more.
Anthony Fernandes
La Salle High School
(Pasadena)
25 Years Education
Biology, Chemistry (All
Levels), Genetics
Certified in Biotechnology
afernandes@lasallehs.org
626.696.4337
B
A
Brian Miller
La Salle High School (Pasadena)
29 Years Education
Biology, Chemistry (All Levels),
Environmental Science,
Anatomy, Physics
Smart Notebook Trainer
smarterteacher.blogspot.com
bmiller@lasallehs.org
626.696.4349
B
Housekeeping
Sign In Sheet
Cell Phones
Bathroom Breaks
Ask Questions
A
Difficulties in Teaching Stoichiometry
Resistance
Math
Conversions
Fractions
Nomenclature
Reading the Problem
HOW TO SOLVE A PROBLEM
Step I.
Understand the Problem
(Put Your Pencil Down)
Collect Relevant Data
Read the Question
What You Have (Knowns)
What You Want (Unknowns)
Act It Out
Choose an Operation
Draw a Picture
Guess and Check
Look for a Pattern
Make a Chart or Table
Make an Organized List
Use Logical Reasoning
Work Backwards
Step III. Solve The Problem
(Pick Up Your Pencil)
Step IV. Analyze Your Result
Does My Answer Make Sense?
Rafe Esquith
Teach Like Your Hair is On Fire
Step II. Choose an Appropriate Strategy
Our Classroom
The 3 C's: Critical Thinking,
Communication, Collaboration
White Boards
Home Depot
Size &
Space
Presentation
Encourages Collaboration
Creates Focus
Manipulatives
Printer Overstocks
B
Pre - Stoichiometry
Periodic Table
Know Your Ions
Memorize or Not to
Memorize
Ion Cards
The Mole Triangle
A
Stoichiometry
Pre-Supposes Balancing Equations,
Chemical Reactions and Calculating
Molar Mass
Introducing Stoichiometry
Utilize One Basic Balanced Equation
Ammonia N2 + 3H2 ---> 2NH3
Rust
4Fe + 3O2 ---> 2Fe2O3
Simple Equation
Varied Coefficients
Work all Aspects
B
Synthesis
A
+
B
AB

Decomposition
AB

A
+
B
Single Replacement
AB
+
CD

AD
+
B
Double Replacement
AB
+
CD

AD
+
CB
4
Fe
N2
+
+
3 O2
2 Fe2O3
3 H2
2 NH3
4
Fe
+
3 O2
2 Fe2O3
What is the mole ratio for each of the
following:
Fe : O2
Fe : Fe2O3
O2 : Fe2O3
A
How many grams of rust (Fe2O3) can be
produced from the complete corrosion of
15 grams of iron?
4
Fe
+
3 O2
2 Fe2O3
Step 1:
Read the Question and Confirm
Equation is Balanced
Step 2:
Highlight Start (have) in Green and
Stop in Red (want).
How many grams of rust (Fe2O3) can be
produced from the complete oxidation of
15 grams of iron?
15 g Fe
? g Fe2O3
4
Fe
+
3 O2
2 Fe2O3
Step 3:
Use Stoichiometry Pieces to Create
Roadmap
B
How many grams of rust (Fe2O3) can be produced from
the complete oxidation of 15 grams of iron?
? g Fe2O3
4
Fe
+
15 g Fe
3 O2
2 Fe2O3
moles of
want
g.f.m. of
want
g.f.m. of
given
grams of
want
__moles
of given
moles of
given
1 mole of
want
1 mole
of given
__ grams of
given
grams of
given
GRAMS
grams of
given
1 mole
of given
moles of
want
g.f.m. of
want
g.f.m. of
given
moles of
given
1 mole of
want
MOLES
x
1 mole of given
gram formula mass
of given
MOLES
moles of want
from balanced
equation
x
x
moles of given
from balanced
equation
grams of
want
GRAMS
gram formula mass
of want
=
1 mole of want
grams of
want
How many grams of rust (Fe2O3) can be produced from
the complete oxidation of 15 grams of iron?
15 g Fe
? g Fe2O3
4
Fe
+
3 O2
2 Fe2O3
Step 4:
Solve Problem Using White Boards
Step 5:
Compare, Correct and/or Present Work
on White Boards.
A
B
It is absolutely FREE!!!
A
How many grams Hydrogen are necessary to produce
0.75 moles of ammonia (NH3)?
N2
+
3 H2
2 NH3
grams of
given
GRAMS
grams of
given
1 mole
of given
moles of
want
g.f.m. of
want
g.f.m. of
given
moles of
given
1 mole of
want
MOLES
x
1 mole of given
gram formula mass
of given
MOLES
moles of want
from balanced
equation
x
x
moles of given
from balanced
equation
grams of
want
GRAMS
gram formula mass
of want
=
1 mole of want
grams of
want
N2
1 mole of
want
moles of
given
__moles
of given
+
3 H2
grams of
want
moles of
want
g.f.m. of
given
2 NH3
__ grams of
given
1 mole
of given
g.f.m. of
want
How many moles of Hydrogen are necessary to produceB
2.5 grams of ammonia (NH3)?
N2
+
3 H2
2 NH3
grams of
given
GRAMS
grams of
given
1 mole
of given
moles of
want
g.f.m. of
want
g.f.m. of
given
moles of
given
1 mole of
want
MOLES
x
1 mole of given
gram formula mass
of given
MOLES
moles of want
from balanced
equation
x
x
moles of given
from balanced
equation
grams of
want
GRAMS
gram formula mass
of want
=
1 mole of want
grams of
want
N2
g.f.m. of
want
__moles
of given
g.f.m. of
given
+
3 H2
2 NH3
1 mole
of given
__ grams of
given
1 mole of
want
moles of
given
grams of
want
moles of
want
Your
Turn
What volume of oxygen is necessary to produce 1.5
grams of rust when an excess of iron is present?
4
Fe
+
3 O2
2 Fe2O3
Suggestions
Student Created Problems
What do you suggest???
WPAs
Professional Development Workshops
by SMARTERTEACHER
SMART Boards and SMART Notebook in the Classroom
SMART Response in the Classroom
Effective Teaching Strategies for the Block Schedule
Teaching the Three C's:
Critical Thinking, Communication and Collaboration
Multiple Intelligences in the Science Classroom
Teaching to Both Sides of the Brain
smarterteacher@gmail.com
smarterteacher.blogspot.com
Attachments
Stoichiometry Moles to Grams.wmv
Stoichiometry Grams to Grams.wmv