scientific measurementsscientific measurements si units significant figures
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Density and SI Units
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Scientific Measurements
SI Units
Significant Figures
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SI Units
Measurement system universal to scientists.
Measurement standards (base and derived)
Base unit— Quantity we can MEASURE
Derived unit-- Quantity provided by CALCULATION
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SI Units (cont.)
Base
Mass = kilogram (kg)
Length = Meter (m)
Time = Second (s)
Temperature = Kelvin (°K)
Derived
Volume = m3, we will use cm3/ml ml is NOT an SI unit
Density = kg/m3, we will use g/cm3 or g/ml
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Mass vs. Weight
What is the difference?
How do we measure mass?
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Density
Physical property of matter/substances
Used for substance identification
Provides information on how solids/liquids interact
Ratio of a substance’s mass and volume
Density = Mass/Volume
Units = SI Unit (kg/m3), we will use g/cm3 or g/ml
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Example 1: A student obtains a mass of 5.03 g for a metal and a volume of 3.24 ml?
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Example 2: What is the volume of a substance with a density of 0.824 g/ml and a mass of 0.451g?
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Example 3: A student records V1= 2.7ml and V2= 3.4 ml after placing an object in a
graduated cylinder. The mass of an empty beaker is 1.13g
and the mass of both the beaker and substance is
4.13g. What is the object’s density?
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Density Problems
1) An object has a mass of 4 grams and a volume of 1.7 cm3. What is it’s density?
2) What is an object’s mass if it’s density is 8.3 g/cm3 and the volume is 4 cm3 ?
3) What is the volume of an object with a mass of 11 grams and a density of 4.2 g/cm3?
4) An object’s mass is found to be 40 grams. When this object is placed in a graduated cylinder with a V1 of 17ml, the V2 becomes 20 ml. What is the object’s density?
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Homework
Density Problems