tool&l measuremen(m4)t
TRANSCRIPT
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Tools and Tools and MeasurementMeasurement
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Recall (Recall (ทบทวนทบทวน))UNITS OF MEASUREMENTUNITS OF MEASUREMENT
Use Use SI unitsSI units — based on the metric system — based on the metric system
Length Length
MassMass
VolumeVolume
TimeTime
TemperatureTemperature
Metre, mMetre, m
Kilogram, kgKilogram, kg
Seconds, sSeconds, s
kelvins, Kkelvins, K
Cubic metre ,mCubic metre ,m33
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Mass vs. WeightMass vs. Weight
• Mass: Amount of Mass: Amount of Matter (grams or Matter (grams or kilograms measured kilograms measured with a BALANCE)with a BALANCE)
• Weight: Force Weight: Force exerted by the exerted by the mass, only present mass, only present with gravity with gravity (Newton, measured (Newton, measured with a SCALE)with a SCALE)
Can you hear Can you hear me now?me now?
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A BALANCEA BALANCE
A ScaleA Scale
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EqualitiesEqualities
State the same measurement in State the same measurement in two different unitstwo different units
lengthlength
10.0 in.10.0 in.
25.4 cm25.4 cm
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Instruments for Measuring Instruments for Measuring VolumeVolume
Graduatedcylinder
Syringe Volumetric flaskBuret Pipet
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Units of Measuring VolumeUnits of Measuring Volume
1 L = 1000 mL
1 qt = 946 mL
Timberlake, Chemistry 7th Edition, page 3
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Reading a MeniscusReading a Meniscus
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Units for Measuring MassUnits for Measuring Mass
1 kg = 2.20 lb
Timberlake, Chemistry 7th Edition, page 3
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Quantities of Quantities of MassMass
Kelter, Carr, Scott, Chemistry A Wolrd of Choices 1999, page 25
Earth’s atmosphere to 2500 km
Ocean liner
Indian elephant
Average human
1.0 liter of water
Grain of table salt
Typical protein
Uranium atomWater molecule
1024 g
1021 g
1018 g
1015 g
1012 g
109 g
106 g
103 g
100 g
10-3 g
10-6 g
10-9 g
10-12 g
10-15 g
10-18 g
10-21 g
10-24 g
Giga- Mega-
Kilo-Kilo-
base
milli-milli-
micro-
nano-
pico-
femto-
atomo-
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Some Tools for MeasurementSome Tools for Measurement
Which tool(s) Which tool(s) would you would you use to use to measure:measure:
A.A. temperaturetemperature
B.B. volume volume
C.C. time time
D.D. weight weight
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Learning CheckLearning Check
Match Match L) lengthL) length M) mass M) mass V) volume V) volume
____ A. A bag of tomatoes is 4.6 kg.____ A. A bag of tomatoes is 4.6 kg.
____ B. A person is 2.0 m tall.____ B. A person is 2.0 m tall.
____ C. A medication contains 0.50 g Aspirin.____ C. A medication contains 0.50 g Aspirin.
____ D. A bottle contains 1.5 L of water.____ D. A bottle contains 1.5 L of water.
M
L
M
V
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Learning CheckLearning Check
What are some U.S. units What are some U.S. units that are used to measure that are used to measure each of the following?each of the following?
A. length A. length
B. volume B. volume
C. weightC. weight
D. temperatureD. temperature
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Learning CheckLearning Check
Select the unit you would use to measure Select the unit you would use to measure
1. Your height1. Your height
a) millimeters a) millimeters b) metersb) meters c) c) kilometerskilometers
2. Your mass2. Your mass
a) milligramsa) milligrams b) gramsb) grams c) kilograms c) kilograms
3. The distance between two cities3. The distance between two cities
a) millimetersa) millimeters b) metersb) meters c) kilometers c) kilometers
4. The width of an artery4. The width of an artery
a) millimetersa) millimeters b) metersb) meters c) kilometers c) kilometers
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SolutionSolution
1. Your height1. Your height
b) metersb) meters
2. Your mass2. Your mass
c) kilogramsc) kilograms
3. The distance between two cities3. The distance between two cities
c) kilometersc) kilometers
4. The width of an artery4. The width of an artery
a) millimetersa) millimeters
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1. 1000 m = 1 1. 1000 m = 1 ______ a) mm b) km c) dma) mm b) km c) dm
2. 0.001 g = 1 2. 0.001 g = 1 ___ ___ a) mg b) kg c) dga) mg b) kg c) dg
3. 0.1 L = 1 3. 0.1 L = 1 ______ a) mL b) cL c) dLa) mL b) cL c) dL
4. 0.01 m = 1 ___ 4. 0.01 m = 1 ___ a) mm b) cm c) dma) mm b) cm c) dm
Learning CheckLearning Check
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1. 1000 m = 1 1. 1000 m = 1 ______ a) mm a) mm b) kmb) km c) dm c) dm
2. 0.001 g = 1 2. 0.001 g = 1 ___ ___ a) mga) mg b) kg c) dg b) kg c) dg
3. 0.1 L = 1 3. 0.1 L = 1 ______ a) mL b) cL a) mL b) cL c) dLc) dL
4. 0.01 m = 1 ___ 4. 0.01 m = 1 ___ a) mm a) mm b) cmb) cm c) dm c) dm
Learning CheckLearning Check