Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have...
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![Page 1: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/1.jpg)
Density
![Page 2: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/2.jpg)
Comparing Feathers and Rocks
1 kg of feathers 1 kg of rock
Which do you think would have the greater mass?Which do you think would have the greater volume?
![Page 3: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/3.jpg)
Density
Density is defined as mass per unit volume. Density is a measure of how tightly packed
molecules are in an object. Basically, it is the amount of matter within a
certain volume.
![Page 4: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/4.jpg)
The Math…
The Units: Mass = Grams (g)
Volume (2 ways) Ruler = cm3
Displacement = ml
Density (2 ways) Ruler = g/cm3
Displacement = g/ml
![Page 5: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/5.jpg)
What is Density?
IRON! It has the most mass for that volume.
If you take the same volume of different substances, thenthey will weigh different amounts.
Water IronWood
1 cm3
1 cm3
1 cm3
0.50 g 1.00 g 8.00 g
Q) Which of these is most dense? Why?
![Page 6: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/6.jpg)
Density for different things…
Each substance has it’s own density.It does not matter how much of a substance you have, it will have the samedensity.
1 gram of water will have the same density as 100 grams of water Distilled Water has a density of 1 g/cm3
(This is the only density you need to memorize!)
Substance Density (g/cm3)
Hydrogen 0.00009Helium 0.000178Air (atmospheric air) 0.001293Carbon Monoxide 0.00125Carbon Dioxide 0.001977Gasoline 0.70Ice 0.922Water (@ 20deg C) 0.998Water (@ 4deg C) 1.000Milk 1.03Magnesium 1.07Water in the Dead Sea (31.5% salt in the water)
1.24
Aluminum 2.7Iron 7.8Lead 11.3Mercury 13.6Gold 19.3Lead 21.4
![Page 7: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/7.jpg)
Density for different things…
Objects with different densitiesinteract in a very predictable way
The more dense object will sink, theless dense will rise to the top…
Substance Density (g/cm3)
Hydrogen 0.00009Helium 0.000178Air (atmospheric air) 0.001293Carbon Monoxide 0.00125Carbon Dioxide 0.001977Gasoline 0.70Ice 0.922Water (@ 20deg C) 0.998Water (@ 4deg C) 1.000Milk 1.03Magnesium 1.07Water in the Dead Sea (31.5% salt in the water)
1.24
Aluminum 2.7Iron 7.8Lead 11.3Mercury 13.6Gold 19.3Lead 21.4
![Page 8: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/8.jpg)
Different objects have different densities
Is the ice or the water more dense?The water is more dense
than the ice because the ice floats!
Objects with less than 1 g/cm3 density will float in tap water (ex: ice at 0.93)
Objects with more than 1 g/cm3
density will sink in tap water (ex: gold at 19.3)
![Page 9: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/9.jpg)
Sidenote…
Sulfur hexaflouride. Density? Explain this.
![Page 10: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/10.jpg)
The Math…
The Units: Mass = Grams (g)
Volume (2 ways) Ruler = cm3
Displacement = ml
Density (2 ways) Ruler = g/cm3
Displacement = g/ml
![Page 11: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/11.jpg)
Determining Density
Step 1:Find the mass of the object
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Determining Density
STEP 2: Determine Volume
We have 2 ways to determine VOLUME. Measure
Cube = L * W * H Cylinder = Πr2H Sphere = (4Πr3)/3
Calculate Displacement Displacement is how much liquid is moved out of the way
to make room for the object placed in water
![Page 13: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/13.jpg)
Determining Volume: Displacement
Calculate Displacement Displacement is how much liquid is moved out of the way
to make room for the object placed in water
![Page 14: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/14.jpg)
Determining Density
Step 3:Calculate
Density = Mass Volume
Units:For ruler: g/cm3
For displacement: g/ml
![Page 15: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/15.jpg)
1) Find the mass of the object
2) Find the volume of the object
3) Divide : Density = Mass / Volume
To find density:
Ex. If the mass of an object is 35 grams and it takes up 7 cm3 of space, calculate the density.
![Page 16: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/16.jpg)
1) Find the mass of the object
2) Find the volume of the object
3) Divide : Density = Mass / Volume
To find density:
Set up your density problems like this:
Known: Mass = 35 grams Unknown: Density (g/cm3) Volume = 7 cm3
Formula: D = M / V Solution: D = 35g / 7cm3
D = 5g/cm3
Ex. If the mass of an object is 35 grams and it takes up 7 cm3 of space, calculate the density.
![Page 17: Density. Comparing Feathers and Rocks 1 kg of feathers 1 kg of rock Which do you think would have the greater mass? Which do you think would have the.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e605503460f94b5a887/html5/thumbnails/17.jpg)
Osmium is a very dense metal. What is its density in g/cm3 if 50.00 g of the metal occupiesa volume of 2.22cm3?
1) 2.25 g/cm3
2) 22.5 g/cm3
3) 111 g/cm3
Practice Problem 1
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lecturePLUS Timberlake
18
What is the density (g/cm3) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? A) 0.2 g/ cm3 B) 6 g/cm3 C) 252 g/cm3
25 ml 33 mL
Practice Problem #3