units of measurement agenda review elements lab reports tuesday song notes on units of...
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Units of MeasurementUnits of Measurement
AgendaAgenda Review elementsReview elements Lab Reports TuesdayLab Reports Tuesday SongSong Notes on Units of Measurement & SNNotes on Units of Measurement & SN HomeworkHomework
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FFfluorinefluorine
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OOoxygenoxygen
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seleniumseleniumSeSe
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NNnitrogennitrogen
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chlorinechlorineClCl
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SSsulfursulfur
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PPphosphorusphosphorus
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BrBrbrominebromine
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strontiumstrontiumSrSr
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IIIodineIodine
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arsenicarsenicAsAs
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GaGagalliumgallium
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aluminumaluminumAlAl
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Percent error formula?Percent error formula?
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Units of MeasurementUnits of MeasurementDate:Date:
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SongSong
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SI UNITSSI UNITS
International System of UnitsInternational System of Units Measurements used around the world so Measurements used around the world so
results are comparable.results are comparable.
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Base UnitsBase Units
How would you define base units?How would you define base units?
Basic unit of measurementBasic unit of measurement
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LengthLength
Meter, mMeter, m
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MassMass
Kilogram, kgKilogram, kg
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Amount of SubstanceAmount of Substance
Mole, molMole, mol
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TemperatureTemperature Kelvin, KKelvin, K
NO degree sign!NO degree sign!
Absolute Temperature Absolute Temperature no negative # no negative # At absolute 0, all molecular motion stopsAt absolute 0, all molecular motion stops
Celsius to KelvinCelsius to Kelvin ooC + 273 = KC + 273 = K
Celsius to FahrenheitCelsius to Fahrenheit ooF = (9/5*F = (9/5*ooC) + 32C) + 32
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Derived UnitsDerived Units
DefineDefine
A combination of base unitsA combination of base units
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VolumeVolume
mm33
Length x width x heightLength x width x height
Not very practical unit so we’ll use LNot very practical unit so we’ll use L
1 cm1 cm33 = 1 mL = 1 mL 1000 L = 1 m1000 L = 1 m33
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DensityDensity
Mass / volumeMass / volume Kg/mKg/m33
More practical g/mLMore practical g/mL
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PressurePressure
Force / AreaForce / Area
mmHg, torr, kPa, atmmmHg, torr, kPa, atm
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Reliability of MeasurementsReliability of Measurements
Accuracy: the closeness of a Accuracy: the closeness of a singlesingle measurement to its true value.measurement to its true value. Hitting the bullseye.Hitting the bullseye.
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Precision: the closeness of a Precision: the closeness of a setset of values of values to each other.to each other.
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Measurement ExplorationMeasurement Exploration
Which measuring devices are more Which measuring devices are more precise?precise?
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Basic FormulaBasic Formula
A * 10A * 10exponentexponent
A number between 1 and 10A number between 1 and 10
If original number > than 1, exponent +If original number > than 1, exponent + If original # < than 1, exponent -If original # < than 1, exponent -
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PracticePractice
30003000 26530002653000 5460054600 130130 0.0000560.000056 0.004560.00456 0.078690.07869 3.14159263.1415926
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HomeworkHomework