chemnistry and mathematics - the perfect couple?
TRANSCRIPT
Chemistry and Mathematics – the Perfect Couple?
Michael SpringborgPhysical and Theoretical Chemistry
University of Saarland66123 Saarbrücken
Germany
What is chemistry?
What is chemistry?
What is chemistry?
Chemistry is, however, also related to mathematics and data
manipulation!
Farmaceuticals:
Functionality?Side effects?
Washing powder:
Do they clean?Colours?Environment?
Elctronic components;Plastics:
Waste?Replace expensive elements through cheaper ones.Stability (atmosphere, environment, time, light, weather, …)
Are they (only) healthy?
Accordingly: Not only synthesis in the labBut also:Study of properties:• Costs• Risks for environment, health• Stability (mechanical, thermal, light, atmosphere)• Leftovers of products, educts, …• Wanted / required properties?
No yes/no questions! Instead quantitive studies!
Also the development of theoretical methods is important
Keto – Enol Tautomers of
Acetone
The determination of properties is often indirect.Based on mathematical identities.
Ideal gas law:
P V = n R T
n = m / M
Then:
P = (R T m) / (M V)
P: pressureV: volume:n: # molR: Gas constantT: abs. temperaturem: massM: molar mass
Units are very important
Our „laws“ are not exact – but idealizations that may or may not be
sufficiently accurate.(„Essentially all models are wrong but
some are useful“)
Again ideal gas law:
P V = n R T
or
Z = (P V) / (n R T) = 1
If ideal gas law is not suffieciently accurate, one may restore to other laws. For instance van der Waals
law:
Important: when to use which approximation.
Accuracy is an issue:
1.03 m/s ≠ 1.030 m/s
Measured quantities have error bars
Manipulation of measured date
is an issue
Typical procedure
Scientific question
Mathematical question
Scientific answer
Mathematical answer
Mathematics is the language of science
Scientific question
Mathematical question
Scientific answer
Mathematical answer
Where do chemistry students have problems?
Where can Math-Bridge help?
Why do chemistry students have problems with mathematics?
Unrealistic ideas about chemistry.
Inadequate background knowledge.
Interest in science but not at all in mathematics.
Mathematics is the language of science.
If you do not understand the language, you do not understand
the science.
We expect from the students that they master simple mathematics:
1. Simple arithmetics (+,-,*,/,**)2. Simple functions (cos, sin, exp, ln, log, powers, polynomials)3. Differentiation4. Integration5. (Linear) differential equations6. Linear equations7. Quadratic equations8. Sums and series9. Linearization10. Minimization and fitting11. Complex numbers12. Discrete probability distributions13. Vectors14. Matrices
And that they can read and understand mathematical
expressions:
P V = n R T
Study of Chemistry
Classical fields of chemistry:
Inorganic chemistry
Organic chemistry
Physical chemistry
Synthesis – matches typical expectations
Properties – surprise; contains physics and mathematics; often problematic
Since some years: new 1st semester course
Introduction to Physical Chemistry
(contains a little of everything in PC plus of mathematics and of English)
Experience with Math-Bridge / Active-Math
The students of „Introduction to PC“ were offered access to Active-Math
Active training was awarded extra credit points in examination (125 / 100 possible; 50 necessary; 5 extra)
Students had to accept that activity was monitored individually
Performance and skills were not monitored
Only few made use of the offer
Experience with Math-Bridge / Active-Math
Why so few?
Not part of the lectures / exercises
Not well-known
Problematic attitude towards mathematics
Next attempt:
Use Math-Bridge directly in bridge course before lectures start
Scientific question
Mathematical question
Scientific answer
Mathematical answer
Here Math-Bridge can help
Here Math-Bridge could be extended
Concluding:
Chemistry and Mathematics – the Perfect Couple?
Not really – their relation is rather based on necessity than love. A ”family” therapy (=
Mathe-Bridge) could help.
Thank you very much!