Tools and Tools and MeasurementMeasurement

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

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?

A BALANCEA BALANCE

A ScaleA Scale

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

Instruments for Measuring Instruments for Measuring VolumeVolume

Graduatedcylinder

Syringe Volumetric flaskBuret Pipet

Units of Measuring VolumeUnits of Measuring Volume

1 L = 1000 mL

1 qt = 946 mL

Timberlake, Chemistry 7th Edition, page 3

Reading a MeniscusReading a Meniscus

Units for Measuring MassUnits for Measuring Mass

1 kg = 2.20 lb

Timberlake, Chemistry 7th Edition, page 3

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-

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

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

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

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

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

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

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