1Matter and MeasurementScientific MethodWhen 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 theoryis the explanationfor a law.Quantitative vs. QualitativeQualitative = DescriptiveQuantitative = MeasuredTaking measurements of real world quantitiesThe 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 matterPure substances (elements and compounds)Homogeneous mixtures (solutions)Heterogeneous mixtures1. All atoms are made from protons, neutrons and electrons2. All elements are made of atoms3. All compounds (molecules) are made from elements (chemically bound)4. All Mixtures are made from combinationsof elements and/or compounds (not chemically bound)Chicken Noodle SoupHeterogeneous mixture(obvious)Whole BloodHeterogeneous mixture(not so obvious with naked eye observations)Salt WaterSolution(uniform even under high magnification)
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