Density & Temperature Unit 1: Measurement & matter Aim: What determines the density of a substance?
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Transcript of Density & Temperature Unit 1: Measurement & matter Aim: What determines the density of a substance?
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Density & TemperatureUnit 1: Measurement & matter
Aim: What determines the density of a substance?
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Density
Ratio of the mass of an object to its volume
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Density• Commonly used to identify
substances
• Explains why things float
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How Does an Ice Cube Float?
A B C
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Density of water is 1 g/mL
Relative: In relation to
More Dense > 1 g/mLLess Dense < 1 g/mL
Density of Water
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Which will float? Object with higher density
than water?
Or
Object with lower density than water?
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Density & Volume Increase in volume, decreases the
density
What type of relationship is this? Indirect Inversely proportional
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Why Did the Titanic Sink??
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Density & Mass As mass increases, density increases
What type of relationship is this? Directly proportional
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1. the “Compactness” of an object
2. Mass of particles there are per unit of area
3. How an object uses its space
Density [in words]
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Density [Visual]:
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Calculating density
V
m
d
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Example #1An unknown substance has a mass of 8.7g and a volume of 3.2cm3. What is the density of the substance in sig figs?
A: 2.7 g/cm3
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Example #2
What is the volume of a pure silver coin that has a mass of 14g in sig figs? The density of silver (Ag) is 10.5g/ml
A: 1.3 `ml
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Volume: the amount of space an object takes up
What are two ways we measure volume?
•Video
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Measuring Volume
Volume [=] mL [=] cm 3
With a ruler:V= L x W x H [=] cm x cm x cm
With glassware (water displacement):1mL [=] 1cm 3
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Displacement
Usually used for awkward shaped objects
Final Volume
Initial Volume
VolumeOf
Object=
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TemperatureMeasure of how hot/cold an
object is
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Scientists Use 2 Temperature Scales
CelsiusDevised by Swedish Astronomer Anders Celsius. Temperature scale most commonly used for scientific work; freezing point of water =0˚C ; boiling point =100˚C
KelvinProposed by Lord William Kelvin0 K= lowest possible temperature or absolute zero
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Converting Between the 2
Celsius to KelvinK =˚C + 273
Kelvin to Celsius
˚C= K─273