apchp1kotzlecture - Scientific Method Matter and...

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1 Matter and Measurement Scientific Method When our hypothesis successfully predicts what will happen, we designate it as a scientific law – a (usually) mathematical description of “here’s what will happen.” A theory is the explanation for a law. Quantitative vs. Qualitative Qualitative = Descriptive Quantitative = Measured Taking measurements of real world quantities The precision of the measurement is limited by the measuring device. You are allowed one digit of uncertainty in any measurement and no more. Classification of matter Pure substances (elements and compounds) Homogeneous mixtures (solutions) Heterogeneous mixtures 1. All atoms are made from protons, neutrons and electrons 2. All elements are made of atoms 3. All compounds (molecules) are made from elements (chemically bound) 4. All Mixtures are made from combinations of elements and/or compounds (not chemically bound) Chicken Noodle Soup Heterogeneous mixture (obvious) Whole Blood Heterogeneous mixture (not so obvious with naked eye observations) Salt Water Solution (uniform even under high magnification)
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2 States of Matter Physical separation could be: distillation, magnetic properties,
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This note was uploaded on 12/07/2011 for the course CHEM 100 taught by Professor Feebeck during the Fall '10 term at Purdue University-West Lafayette.

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apchp1kotzlecture - Scientific Method Matter and...

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