Chem 1211 2nd Edition Lecture 1Outline of Last Lecture I. Introduction to ClassII. Received SyllabusOutline of Current Lecture I. MatterII. Scientific MethodIII. Scientific or Natural LawsCurrent LectureI. What properties define matter?a. Takes up spaceb. Has massc. Made up of atomsd. DensityII. Scientific methoda. Observationb. Hypothesis- a tentative explanation or prediction based on experimental observationsc. Experimentd. Theory- a well-tested, unifying principle that explains a body of facts and the laws based on them. It is capable of suggesting new hypotheses that can be tested experimentallye. Law- A concise verbal or mathematical statement of a behavior or a relation that seems always to be the same under the same conditionsIII. Scientific or Natural Lawsa. Conservation of matter- matter can be changed but not created or destroyedb. Conservation of energy- energy cannot be created or destroyedc. Conservation of Matter and Energy- has to do with the big picture (in the universe, matter and energy cannot be created or destroyed)d. Einstein’s theory of relativity- E=mc^2 (AKA energy=mass x constant)i. Has to do with nuclear energy, which we will discuss laterii. Energy holds protons and nucleons togetherIV. Example: According to the law of conservation of matter, in the reaction C2H6 + 3O2 CO2 + CO + 3H2O, which masses are equal?a. Answer: C2H6 + 3O2 = CO2 + CO + 3
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