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Cultivating Conceptual Chemical Thinking: Can You Visualize It?. Scott A. Sinex & Barbara A. Gage Department of Physical Sciences Prince George’s Community College. Presented at the Middle Atlantic Regional Meeting of the American Chemical

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cultivating conceptual chemical thinking can you visualize it

Cultivating Conceptual Chemical Thinking: Can You Visualize It?

Scott A. Sinex & Barbara A. Gage

Department of Physical Sciences

Prince George’s Community College

Presented at the Middle Atlantic Regional Meeting of the American Chemical

Society held at George Mason University in Fairfax, VA on 28-30 May 2002.

slide2

Building A Conceptual Understanding

Microscopic –

the particulate nature of matter

The atomic level

(abstract)

Symbolic – mathematical equation or chemical equation

Macroscopic - observations or results of an experiment

How we represent it

The visible world or

How we SEE it

what we want students to do
What we want students to do
  • Model data with algebra
  • Use graphical approach with simulations
  • Use science process
  • Understand concepts
  • Visualize at an atomic/molecular level

Think critically!!

slide5

The following is a text of the emergency chemistry instruction system.

This is only a test!

slide6

Can you hit the bull's-eye?

Three shooters with three arrows each to shoot.

How do they compare?

Both accurate and precise

Precise but not accurate

Neither accurate nor precise

Can you define accuracy and precision based on the graphics above?

slide7

How does the mass influence the vibration?

H2

I2

MM = 2 g/mole

MM = 254 g/mole

4111 cm-1

365 cm-1

The greater the mass - the lower the wavenumber

Estimate the wavenumber for the HI stretch.

2919 cm-1

slide8

Have you ever tried explaining the derivative to students?

HCl + NaOH  NaCl + H2O

The slope between each pair of data points.

inflection point - changed from increasing to decreasing

pH

decreasing slope

7

increasing slope

How is the slope changing?

Volume of titrant (mL NaOH)

slide9

How about intramolecular interactions?

(Click on image to load movie- slow, big file)

di-t-butyl peroxide

Movie produced in Spartan ‘02

Discovering Intramolecular Interactions – html activity

slide10

Can vibrations change the dipole of a molecule?

(Click on image to load movie- slow, big file)

CH2Cl2

Dipole moment

Cl-C-Cl bond angle

Movie produced in Spartan ‘02

Studying Vibrations in Molecules – html activity

the tools of conceptual visualization
The tools of conceptual visualization
  • Animation in PowerPoint XP
  • Spartan ’02 computational chemistry software
  • Stella modeling and simulation software
  • Interactive Excel spreadsheets
  • Chime molecular rendering freeware
  • Netlogo simulation freeware
  • Flash animation software (future effort)

Click on links above for information/download of software.

slide12

Some more examples

Interactive Excel: Weak Acid Behavior

Beers Law Simulator

(pdf activity using simulator)

Netlogo gas particle motion

Structure and Bonding –

a series of Chime activities

Stella model for crystal violet kinetics

what are our outcomes
What are our outcomes?
  • Web-based interactive assignments – both in and out of class
  • More student involvement in class and lab – they are engaged!
  • More integration of mathematics
  • Can ask higher-order questions

Let’s look at an example

e e 0 0591 ph

A higher-order thinking example:

E = E’ – 0.0591 pH

For the calibration of pH electrode:

How does the measured voltage, E, vary with pH?

How does the graph change if the glass membrane ages with time?

What is influenced by a change in temperature?

E ’

new E ’

E ’ is function of temperature too!

E

Slope = -0.0591

new slope

pH

slide15

This has been a test.....

Department of Physical Sciences – downloadable resources at http://academic.pg.cc.md.us/psc

Scott Sinex (sinexsa@pg.cc.md.us)

http://academic.pg.cc.md.us/~ssinex

see teaching and publications list

Barb Gage (gageba@pg.cc.md.us)

http://academic.pg.cc.md.us/~bgage

see courses taught