ch. 1: the chemical world dr. namphol sinkaset chem 152: introduction to general chemistry
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I. Layman’s View of ChemicalsTRANSCRIPT
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Ch. 1: The Chemical WorldCh. 1: The Chemical World
Dr. Namphol Sinkaset
Chem 152: Introduction to General Chemistry
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I. Chapter OutlineI. Chapter Outline
I. IntroductionII. Atoms and MoleculesIII. The Scientific MethodIV. Succeeding in Chemistry
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I. Layman’s View of I. Layman’s View of ChemicalsChemicals
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I. Educated View of ChemicalsI. Educated View of Chemicals
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I. The Nature of ChemistryI. The Nature of Chemistry
• Revolves around the question “Why?”
• Make connections between macroscopic and microscopic behavior.
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II. Atoms and Molecules II. Atoms and Molecules
• Microscopic view refers to atoms.• Atoms can bind together to form
molecules.• chemistry: the science that seeks to
understand what matter does by studying what atoms/molecules do
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II. Carbon Dioxide and WaterII. Carbon Dioxide and Water
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III. The Scientific MethodIII. The Scientific Method
• A way of learning that emphasizes observation and experimentation.
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III. It Begins w/ ObservationsIII. It Begins w/ Observations
• Scientists begin their study by making an observation or measurement.
• Observation can be simple description or complex measurement.
• e.g. Fleming noticed bacteria-free rings around a certain mold.
• e.g. Lavoisier measured masses before and after combustion reactions.
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III. A Hypothesis is Formed III. A Hypothesis is Formed and Testedand Tested
• Observations lead to preliminary interpretation or explanation.
• The hypothesis should be falsifiable.• Hypotheses are tested via experiments.• experiment: highly controlled observations
designed to validate/invalidate a hypothesis.
• Results may lead to revision of hypothesis.
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III. Scientific LawsIII. Scientific Laws
• Many similar observations may be developed into a scientific law.
• scientific law: statement that synthesizes past observations and predicts future ones
• Laws can be tested with experiments as well.
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III. TheoriesIII. Theories
• One or more well-established hypotheses can be formulated into a theory.
• theory: models of nature that provide a broader and deeper explanation of observations and laws
• A lot of work goes into formulating a theory; they are the height of scientific understanding…not “just a theory.”
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IV. Keys to SuccessIV. Keys to Success
• Curiosity – you need to be interested in finding out the “why” of things.
• Math – you need to have the math skills to deal with and calculate quantities in chemistry.
• Hard work – you need to be able to commit the time and effort to be successful.