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Abstract
Using a balanced equation, students will be able to calculate the
mass of an unknown from a given mass. Students will determine their
"final" recipe by employing stiochiometry. Students will test their
"recipe" for desired product qualities. As the students test their
"recipe" they will modify their "recipe" accordingly.
Lesson fundamental understandings:
Essential
Questions: 1. What are the steps involved in going
from an unknown mass of reactant to a known mass of product?
2.
How much raw materials (reactants) does one need to make desired
product?
3. Is the "recipe" producing the desired product
qualities? if not what needs to be done to modify the "recipe"?
Standards
National Standards Mathematics is
essential in sientific inquiry. Mathematical tools and models guide
and improve the posing of questions, gathering data, constructing
explanations, and communicating results. Scientific explanations
must adhere to criteria such as: a proposed explanation must be
logically consistent; it must abide by the rules of evidence; it
must be open to questions and possible modifiation; and it must be
based on historical and current scientific knowledge.
State Standards Nebraska State
Standards: By the end of twelfth grade, students will develop the
abilities needed to do scientific inquiry. Nevada State Standards:
20.12.1 Use mathematical symbols and formulas to express
relationships that behave in the same ways as the objects or
processes under investigation 22.12.1 Analyze experimental
procedures and suggest appropriate revisions for improvement
Lesson
Prerequisite Skills
1. Students need to be able write a formula and a balanced
equation. 2. Students need to be able to convert from mole to grams
and grams to moles. 3. Students need to be able to use a mole ratio.
Teacher
Information/Situations/Setting/Time Time Frame: 4
days: One day instructor introduces going from grams of known to
grams of unknown. Also, instructor gives practice problems involving
mixed stiochiometry problems. Day two: students do an application
lab (Example: Bicarbonate Dilmma from CRYSTAL). On day three,
students take quiz on mixed stiochiometry problems. On day four,
students work on project trials.
Materials/Resources: Lab
equipment such as: crucibles, sodium bicarbonate, tongs, sodium
chloride, clay triangles, iron rings, Bunsen burners, ring stands,
balances, safety goggles, aprons for the lab "Bicarbonate dilema".
Materials for projects: Beakers, graduated cylinders, balances,
tongs, Bunsen burners, safety goggles, aprons, chemicals for making
products
Instructor needs to have worksheet for mixed
stiochiometry problems and Quiz for mixed stiochiometry
problems.
Pre-lesson Preparation: Instructor needs to prepare
mixed stiochiometry worksheet and quiz. Instructor needs to set up
lab for bicarbonate dilemma and have materials set out for student
projects.
Assessment
1. Homework worksheet on mixed stiochiometry problems with group
and instructor feedback.
2. Lab report for application lab "
Bicarbonate dilemma"
3. Quiz invovling mixed stiochiometry
problems.
4. Journal entries for step four of project.
5.
Worksheet and evaluation of step four of project.
Student Activity/Tasks 1. Students will
review mole to gram problems and gram to mole problems.
2. With
instructor guidance students will create a roadmap for stiochiometry
problems. Instructor will put mole ratio in the middle and students
will make connections of how to go from mass of known to unknown
mass by going through the middle of mole ratio.
3. Students will
practice stiochiometry by doing problems on worksheet provided by
instructor.
4. Students will perform a lab involving
stiochiometry (Bicarbonate Dilemma)
5. Students will perform quiz
on mixed stiochiometry problems given by instructor.
6. Students
will determine final recipe for project by performing the
stiochiometry and finding amounts of reactants. Students will test
their recipe in the lab and make revisions to recipe based on the
qualities they are trying to obtain.
Enrichment/Alternate Activity:
1. Instructor may need to do more practice problems and
additional labs or other labs.
Cross-Curricular:
Algebra- ratios and unit analysis
Technology
Requirements/Tools/Materials
Overhead projector for guided practice
Acknowledgements:
Bicarbonate Dilemma from CRISTAL program, Iowa Chemistry Tsk
Force, University of Northern Iowa, Price Laboratory School, Dr.
Jody Stone, Project Director
Additional Resources
Main
URL:
Related Lessons
Related Resources
Step
4 Worksheet
Copyright © 1997-2003
Career Connection to Teaching with Technology
USDOE Technology Innovation Challenge Grant
Marshall Ransom, Project Manager
All rights reserved.
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