Chem 115 1st Edition Lecture 2Outline of Last Lecture I. What is ChemistryII. Properties of ChemistryIII. States of MatterIV. Energy in ChemistryV. Conducting an ExperimentVI. Conversion FactorsOutline of Current LectureI. DensityII. TemperaturesIII. Significant FiguresCurrent LectureDensity: a characteristic physical property and has a specific valueMassVolumeKelvin: “absolute temperature scale”, begins at absolute zero and has only positive valuesCelsius: based on the temperature of waterFahrenheit: temperature measurement in the U.S.0 C = 273.15 K = 32 FF = 9/5 X C + 32Significant Figures: recorded digits both certain and uncertain- The greater the number, the more certain it isEx. 32.33 is more certain than 32.3- Start at the first nonzeroThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. = Density- If there is no decimal, zeros at the end are NOT significantEx. 5300 L has 2 sig-figs 5.3 X 103 has 2 sig-figs5300. L has 4 sig-figs 5.300 X 103 has 4 sig-figs- Multiplying and dividing uses the least number of sig-figs presentEx. 9.5 X 1.753 X 1.0 = 16.6535 = 17 (2 sig-figs)- Adding and subtracting uses the same amount of the fewest decimal placesEx. 5.0 + 7.13 12.13 = 12.1 (3
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