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# Applied Chapter 1.2 : Describing Matter

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### Transcript

• 1. Describing Matter
Chapter 1.2
• 2. Objectives
Distinguish between different characteristics of matter, including mass, volume, and weight.
Identify and us SI unit in measurements and calculations.
Set up conversion factors, and use them in calculations.
Identify and describe physical properties, including density.
Identify chemical properties.
• 3. Matter has Mass and Volume
Matter
Anything that has mass and volume
Volume
Amount of space an object takes up
Use graduated cylinder or meter stick
Measured in mL, cm3, L
Mass
Amount of matter in an object
Use triple beam balance or electronic scale
Measure in grams, mg, kg
Weight
Force produced by gravity acting on object
• 4. Units of Measurement
Quantity
Magnitude, size, or amount
5 3500 0.00045
Unit
Standard of measurement
Liters, Grams, Seconds
SI Units
Standard International Units
• 5. SI Base Units
Quantity Symbol Unit Abbrev.
Length l meter m
Mass m kilogram kg
Time t second s
Volume v Liter L
• 6. SI Prefixes
Prefix Abbrev. Exponent Meaning
Kilo k 103 1000
Hecto h 102 100
Base 100 1
Deci d 10-1 1/10
Centi c 10-2 1/100
Milli m 10-3 1/1000
• 7. Converting Units
Conversion Factor
Ratio that is derived from the equation of two different units and that can be used to convert from one unit to the other.
Example of equalities
1 kg = 1000 g or
1 m = 100 cm or
1 kg
1000 g
1000 g
1 kg
1 m
100 cm
100 cm
1 m
• 8. Using conversion Factors
Identify quantity and unit given
Use correct equality
Set up so given unit cancels out
Multiply by conversion factor
Mass given
Mass
Wanted
1000 g
4.5 kg
=
4500 g
1 kg
Conversion Factor
• 9. Practice
357 mL = ______ L
25 kg = ______ mg
35000 cm3 = ______ L
2.46 L = ______ cm3
Which quantity is larger?
2400 cm or 2 m
3 L or 3 mL
17 g or 1.7 kg
• 10. Derived Units
Requires more than one measurement
Examples:
Speed - distance and time, miles/hour or m/s
Area – length x width, m2
Volume – L x W x H, cm3
1 L = 1000 mL = 1000 cm3
• 11. Properties of Matter
Physical Properties
Property that can be changed without changing the identity of the substance.
Example: color, texture, melting point, smell, density
Density:
Ratio of mass to volume - g/cm3 or g/mL
Density = Mass or D = M
Calculate the density of a piece of metal if its mass is 201.0 g and it volume is 18.9 cm3
Volume
V
• 12. Chemical Properties
Describes a substance’s ability to participate in chemical reactions.
Examples
Rusting
Not rusting– silver and gold
+
table salt
sodium metal
chlorine gas
Sodium Chlorine Sodium Chloride