2Roy A. Lacey, Stony Brook University; Che 131, Fall 2010Scientific Method•A hypothesis is a tentative andtestable explanation for anobservation or a series ofobservations.•A scientific theory is a generalexplanation of widely observedphenomena that have beenextensively tested.Why are measurements important?
3Roy A. Lacey, Stony Brook University; Che 131, Fall 2010`Accurate measurements areessential for characterizingthe physical and chemicalproperties of matter.`Standardization of the unitsof measurements isessential.MeasurementsUNITS MATTER!!`Quantitative‐easy to check`Easy to agree upon, no personal bias`The measuring instrument limits how good themeasurement is.
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