CHMY 121in Lecture 5Outline of Last Lecture- Maintaining Uncertainty o +/- 193.638576 9 005.988000 4 +224.740540 8424.367116 424Examples of Metric/English/ SI conversions- Temperatureo SI unit is the Kelvin (K, not in degrees)o Kelvin is the absolute temperature scaleo Other units include Celsius and Fahrenheito Conversion between the Celsius and Fahrenheit F=32+ 9/5(C) or C= 5/9(F-32)o Conversion between Celsius and Kelvin K=C+273.15 or C=K-273.15Greek PrefixesKilo- (k) one thousandDeci- (d) one-tenthCenti- (c) one-hundredthMilli- (m) one-thousandthMicro- ( ) one-millionthNano- (n) one-billionth**** These conversions are correct and do NOT affect Sig Figs**** 1 tsp= 0.000005 m^3Current Lecture- Densityo • Measure of compactness, “How much Matter is in a given volume?”o Density (D) =mass/volume=m/v=grams/milliliter=g/mLThese 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.Solid Metal Very DenseSolid Wood Less DenseLiquid Lesser DenseGas Least Dense- Intensive & Extensive Propertieso Density does not change when looking at different amounts (intensive property) Other intensive properties include color and temperatureo Extensive properties change when the amount of the sample changes Includes mass, volume, and length- Practice Calculating Densityo A cube that is 10.0 mm x 10.0 mm x 10.0 mm and has a mass of 4.70 g Find the Density D=m/v D= ( 10.0 x 10.0 x 10.0)(4.70 g)= 0.047g/cm^3- Calculations Unit Analysiso 3.5 weeks=.7 days. 24 hour. 60 min. 60 s = 2,116,800 s OR 2.1 x 10^6 s 1 week 1 day 1 hour 1 min- Rearranging Equationso Manipulating equations is a way to solve for variables without changing the meaning of an equationo Can do for addition/subtraction: X = W + Y Y =? W =?
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