1. Section of class powerpoint
The Candle Experiment
Section of class powerpoint

2. 3 Levels of Thinking: Macro
Observations
Measurements
Instrumental methods
Quantitative
numbers “4.37 grams”
Qualitative -
descriptions “blue solid”

3. 3 Levels of Thinking: Micro
What are the molecules doing?
Imagination!
Modeling
Recognize limits of models
Trade accuracy vs. simplicity

4. 3 Levels of Thinking: Symbolic
Represent microscopic
Equations
Numerical
Chemical reaction
Pictures
Make predictions about macro
Explain using micro

5. The Candle Experiment Groups of 3 or 4 Examine using all 3 levels
Macro
Micro
Symbolic
What measurements could you make?
Take notes
Be ready to share your info!

6. Candle Expt Sharing What were your macro observations?
What micro level views explain those?
What symbolic representations are useful?
I … bring before you, in the course of these lectures, the Chemical History of a Candle. There is not a law under which any part of this universe is governed which does not come into play and is touched upon in these phenomena. … There is no more open door by which you can enter into the study of natural philosophy than by considering the physical phenomena of a candle. Michael Faraday - The Chemical History of a Candle

7. Physical & Chemical Properties & Changes
For each observation about the candle, what is an observation you could class as a physical change?
Which physical changes are evidence of chemical changes?
Which physical changes might happen without a chemical change?