Plop!Plop! Fizz! Fizz! Oh, what things chemistry teachers
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Transcript Plop!Plop! Fizz! Fizz! Oh, what things chemistry teachers
Plop! Plop! Fizz! Fizz!
Oh, the things chemistry teachers
can do with AlkaSeltzer!
Patricia Mason, PAEMST 2003
Delphi Community High School
[email protected]
Judith Flint Baumwirt
Granada Hills Charter High School
[email protected]
July 2005, ChemEd Conference, UBC, Vancouver, Canada
Experiments and Activities
Alka Seltzer Rainbow - ChemFax
Demonstration (provided by Flinn Scientific)
Alka Seltzer Rockets
Buffering Ability of Alka Seltzer Tablets
Buffer Balancing Acts - ChemFax
Demonstration (provided by Flinn Scientific)
Common Ion Effect on the Solubility of
Alka Seltzer
Experiments and Activities
Change in pH and Temperature as a
Reaction Occurs
Differentiating Liquids
Decomposition of Effervescent Tablets
Decomposition of Effervescent Tablets
with Sample Data Analysis/Results
Density Challenge
Does a Gas Have Mass?
Experiments and Activities
Effect of Particle Size on Rate of Reaction
Demonstration
Effect of pH on rate of reaction
Effect of Temperature on Rate of
Reaction Demonstration
Rate of Reaction Lab - Combined
Activities for Students
Equilibrium and Rate Determining Step
demonstrations
Experiments and Activities
Micro Popper (provided by Flinn Scientific)
Quantitative Determination of Sodium
Bicarbonate in Alka Seltzer
Second Quarter Laboratory
Evaluation: Analysis of Alka Seltzer
(provided by Flinn Scientific)
What Chemists Do: Identification and
Analysis - White Powder Identification
Alka-Seltzer Rockets
Factors affecting the rates of solution
It is important to break tablets evenly into
four quarters
Only Fuji canisters provide a good seal
(lid fits securely inside the canister)
Inverted in the launcher
Can be used test variables
Factors Affecting Rate of Reaction
Effect of
Temperature on Rate
of Reaction
Teacher
demonstration
Student activity
Effect of Particle
Size on Rate of
Reaction
Whole tablet
Broken in half
Quartered
Coarsely ground
Finely ground
Effect of pH on Rate of Reaction
Complicated set-up
Glass work done by teacher saves time
Solutions available of various pH
Each group uses water plus 2 others
Water displacement technique
Plotting data and analysis
Comparison of rates with pH
Common Ion Effect
Can be used as a discrepant event
Why do the tablets dissolve at different
rates and in varying amounts?
Monitoring Changes in pH and
Temperature as Reaction Occurs
Must use probeware
for pH
Temperature
Tablets are added to
room temperature
water
Data taken for 5
minutes
Variables can be
changed
Number of tablets
Division of tablets
Amount of water
Amount of agitation
Buffering Ability of Alka-Seltzer
Tablets
Macro-Demonstration
Burets HCl and NaOH
Universal indicator
HCl with water
HCl with tablet
NaOH with tablet
NaOH with water
Can also use pH
probes
Micro-Activity
Broken tablets
(0.15g to 0.20 g
samples)
Well-plates
Universal indicator
Calibrate the micropipettes for drops
Does a Gas Have Mass?
Can be used initially for introduction to
Chemistry
Can be used to demonstrate
conservation of mass
When a gas is produced is mass lost?
Baggie provides a closed system
Differentiating Liquids Lab
Good introductory lab activity
Properties of Liquids
Viscosity
Density
Solubility
Detailed data recording and evaluation
Inquiry section, if time permits
Equilibrium and Rate
Determining Step Demo
An entertaining student-centered activity
Shows the progress of a reaction from
reactants to a mixture of reactants and
products
Can visually recognize that the reaction
is favored in the decompositon direction
The “Slow step” is obvious in this
demonstration
What Chemists Do – A Beginning
Analysis Lab
This is a good application of inquiry and
the scientific method.
May be useful as a beginning lab on
analysis
Students have three unknowns to
determine so the lab requires some
extended prep time.
Quantitative Determination of
Sodium Bicarbonate
AP Chemistry
Stoichiometry
Calculations
Limiting Reactant
Graphing
Acid-base
Solutions
Decomposition