1. Flinn Scientific Exploring Chemistry Workshop
Welcome!
Flinn Scientific Exploring Chemistry Workshop
Presented by
Joan Berry

2. Flinn’s Exploring Chemistry
Packages available for 10 major curriculum topics in general chemistry!
Matter and Measurement
Atomic and Electron Structure
Periodic Table
Chemical Bonding
Chemical Reactions
Molar Relationships and Stoichiometry
Gases and Gas Laws
Thermochemistry
Solids, Liquids, and Solutions
Acids and Bases

3. Exploring Chemistry Packages
Lab and demonstrations supplies included for 3 classes of 30 students!
We have selected the best-of-the-best activities for each topic!
Flinn ChemTopic Labs series and POGIL™

4. Exploring Chemistry
Today, we’re going to look at a demonstration from the Thermochemistry Unit and the POGIL from the Gases Unit

5. Today’s Workshop
Discovering Instant Cold Packs Experiment (Thermochemistry, Vol. 10)
Demonstrations
Stoichiometry Balloon Races (Molar Relationships and Stoichiometry)
Energy in Photons (Atomic and Electron Structure)
Upset Tummy? MOM to the Rescue (Acids and Bases)
Foiled Again (Chemical Reactions)
POGIL Gas Laws Activity

6. Stoichiometry Balloon Races (Purple Activity in Packet)
Mole ratio
Limiting and excess reactants
Acid – base neutralization
Jillian presenting

7. Energy in Photons (Yellow Activity in Packet)
Energy and wavelength of light
Absorbance versus transmittance
Phosphorescence
Atomic structure
Mike presenting

8. POGIL Activity – Isotopes (White Packet)
Process Oriented Guided Inquiry Learning (POGIL)
Increase problem solving, content mastery, and analytical reasoning skills.
Series of guiding questions used to interpret data and trends.
1-2 POGILs are included with each major topic package!

9. POGIL Roles Example
Group students and assign roles! For example, in a group of three, you can assign a
Manager – In charge of the group and orchestrating who reads the POGIL out loud. The instructor will answer questions from the manager only.
Recorder – In charge of summarizing the main points of the activity and individual group discussions. Turns in a separate summary to the teacher at the end of the period (great way to check for student understanding).
Presenter – At designated stopping points, this student stands up and shares his or her group’s answers and reasoning.

10. POGIL (from page 1)
Here is an example of one of the models students are asked to read and interpret. Also, make predictions based on the information given.

11. POGIL (from page 2)
Students are then stopped at various parts of the POGIL. At this time, you can have the presenter stand up and explain their group’s answers and reasoning.

12. POGIL (from page 6)
The questions and models build as the POGIL continues.

13. POGIL Activity – Isotopes
Great student-centered learning activity.
Students are asked to interpret and recognize trends.
Models and data illustrate key concepts.

14. POGIL Books Available for Chemistry and AP Chemistry
POGIL Books Available for Chemistry and AP Chemistry. (Biology POGIL books are also available)

15. Discovering Instant Cold Packs
Familiar first aid devices used to treat injuries when ice is unavailable.
Applications oriented experiment (pg 27 of book).
Students can design a procedure to measure temperature change when the “cold pack solid” dissolves in water.
Determine heat of solution for process.
Calorimetry – measurement of the amount of heat energy produced in a reaction.

16. Chemical Concepts Exothermic and endothermic reactions
Heat of solution
Enthalpy change
Calorimetry

17. Pre-Lab or Background Activity
What information is needed to calculate heat of solution?
Heat energy equation q = m × c × DT
m mass of the solution, c specific heat of the solution, and DT temperature change produced when solid dissolves
Identify variables that will affect experiment and results.
Independent and dependent variables?
What variables must be controlled?

18. What is an Instant Cold Pack?
Name of solid – Ammonium Nitrate
Formula of solid NH4NO3, molar mass
80.04 g/mole
Mass of solid g, number of moles
2.305 moles
Volume of water 80.0 mL

19. Sample Procedure (Use Pink Sheet to Collect Data)
Wear goggles!
Nest two Styrofoam cups together, use the graduated cylinder to measure and add 25.0 mL of water.
Place the digital thermometer in the cup, measure and record initial temperature.
Stir and add pre-weighed amount of ammonium nitrate.
Measure and record lowest temperature that is reached.
Dispose of solution in plastic waste cup.

20. Sample Data Table Trial Mass of solid Volume of water Mass of Soln†
Tinitial oC
Tfinal T 1 2
*Each pair of teachers conducts one trial. Share Trial 2 data with second pair of teachers working from same “kit box.”
†See calculations.

21. Calculations Heat energy change q = m × c × DT
Assume m equals total mass of solution, c equals specific heat of water, 4.18 J/g.oC. This is a source of experimental error.
Energy change in joules per gram of solid
Energy change in kilojoules per mole of solid (5.0 g = moles)

22. Sample Results Typical results DHsoln = 25.5-26.5 kJ/mole
Literature value 25.7 kJ/mole
Percent error about 3%!
Assuming cold pack contains 185 g ammonium nitrate and 80.0 mL of water, calculate amount of heat absorbed from surroundings when entire cold pack is activated.

23. Instant Cold Pack – Conclusions
When the white solid in the commercial cold pack dissolves in water, the pack feels (hot/cold) because the temperature of the solution (increases/decreases). Energy is (absorbed/released) from the surroundings during this reaction and the reaction is classified as (endothermic/exothermic). The sign of DH for the heat of solution is (positive/negative).

24. Upset Tummy? MOM to the Rescue (Green Activity in Packet)
Acid – base neutralization
Solubility
Chemical indicators
Equilibrium
Consumer chemistry
Mike presenting

25. Upset Tummy? MOM to the Rescue (Green Activity in Packet)

26. Foiled Again (Blue Activity in Packet)
Evidence of a chemical reaction
Single replacement reaction
Metal activity
Thermodynamics
Catalysis
Jillian presenting

27. Exploring Chemistry Supports You – the Teacher!
Teacher-designed, student-tested activities
Optimized for safety and success!
Comprehensive Teachers’ Notes
Each package includes chemicals, specialized materials, one to two POGIL activities, and complete instructions, as well as free online video resources, for three classes of 30 students working in pairs.

28. Flinn
If you have any questions, give us a call or ! We’d love to help!