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1 Chemistry and the Scientific Method (2009)

1 Chemistry and the Scientific Method (2009) - Chemistry...

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Chemistry &  The Scientific Method The Foundations of Chemistry
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Why Chemistry?
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(c) Lanzafame 2007 The Problem with Chemistry General Chemistry can seem like a bunch of  barely connected concepts about a bunch of  strange little things (molecules) that you never  directly observe.
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(c) Lanzafame 2007 The Context of Chemistry All of those seemingly unconnected concepts are  really a series of questions that could be asked  about the reactions and physical properties of  molecules.
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(c) Lanzafame 2007 EVERYTHING is Chemistry All substances are constructed of molecules.   Chemistry is the study of those molecules. This study has 2 main areas of study.
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(c) Lanzafame 2007 The Physical of Chemistry “What are their physical properties?” 1. State of matter (solid, liquid, gas) 2. Boiling point 3. Freezing point 4. Solubility in other liquids 5. Malleability 6. Electrical Conductivity 7. Heat Conduction 8. Tensile Strength
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(c) Lanzafame 2007 The Chemical of Chemistry What is the reactivity of the molecules? 1. Will they react to form new substances with A, B, or C? 2. How fast will that reaction occur? 3. Are the likely products more stable than the reactants? 4. What is the yield of the reaction?  What limits the yield of the  reactions? 5. Does the reaction create energy or require energy? 6. Does the reaction use electrons or generate electrons? 7. What is the structure of the new materials? 8. Are any byproducts generated by the reaction?
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(c) Lanzafame 2007 The Difference? Chemical properties (& changes) involve changes  in COMPOSITION. Physical properties (& changes) involve a constant  composition.
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(c) Lanzafame 2007 Example: Boiling water     physical It’s water when you start, it’s water when you end Cracking an egg physical It’s an egg when you start it’s a (broken) egg when you finish Boiling an egg chemical A bit tricky – the protein in the egg is modified by the heat which is why  it changes consistency.  It’s a new molecule!
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(c) Lanzafame 2007 Water boiling – physical change
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(c) Lanzafame 2007 Rust  Chemical  change
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(c) Lanzafame 2007 Why they make you come here The world is made up of molecules. If you want to build a bridge, what properties must it have?  What  properties must its parts have? Life is about motion and change.  What causes the changes?  What  limits the changes?  What could we do to improve the situation?
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(c) Lanzafame 2007 Questions are more important than  answers Answers are fleeting and specific.
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