Week 1, Section Meeting

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Week 1, Section Meeting

• 9/8/05

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Define the following

• Fact
• Law
• Theory
• Hypothesis
• Model

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According to the National Academy of Science, a
Hypothesis is
A testable statement about the natural world that
can be used to build more complex inferences and
explanations
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According to the National Academy of Science, a
Fact is
In science, an observation that has been
repeatedly confirmed.
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According to the National Academy of Science, a
Law is
A descriptive generalization about how some
aspect of the natural world behaves under stated
circumstances How are a fact and a law
related? Can you think of any scientific laws?
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Some Examples of Laws as stated by Dalton

• Law of Conservation of Matter
• In an ordinary chemical reaction matter is
  neither created nor destroyed.
• The sum of the masses of the reactants equals the
  sum of the masses of the products.

• Law of Constant Composition
• A chemical compound always contains the same
  elements in the same proportions by mass.

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According to the National Academy of Science, a
Theory is
In science, a well-substantiated explanation of
some aspect of the natural world that can
incorporate facts, laws, inferences, and tested
hypotheses. Theories must be falsifiable.
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According to the National Academy of Science, a
Model is

• A description or analogy used to help visualize
  something (as an atom) that cannot be directly
  observed

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Theory vs. Model

• Theory based on facts, evidence
• Model is the picture, an analogy, a way of
  describing a theory

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Qualitative vs. Quantitative

• Fehlings Reagent
• http//jchemed.chem.wisc.edu/JCESoft/CCA/CCA0/MOVI
  ES/FEHLTEST.html

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Please Make Sure to Hand-in

• Group contract
• GSI selection for in-class point assignment