How to Calculate Density. How do we know the density of a substance? We can’t see the molecules...
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Transcript of How to Calculate Density. How do we know the density of a substance? We can’t see the molecules...
![Page 1: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/1.jpg)
How to How to Calculate Calculate DensityDensity
![Page 2: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/2.jpg)
How do we know the How do we know the density of a substance?density of a substance?
• We can’t see the molecules inside a substance to know how dense it is.
• Instead we can calculate how dense something is.
• Remember, density is how much mass is in a certain space.
• Therefore…
![Page 3: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/3.jpg)
Remembering MassRemembering Mass• To get the density of an object you need to
know its mass and its volume.• Mass- the amount of matter in an object. • To measure mass, we use a triple beam
balance.
Units for mass= grams
![Page 4: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/4.jpg)
Remembering VolumeRemembering Volume• Volume- the amount of
space an object takes up.
• To measure the volume of a liquid, we use a graduated cylinder.
• To measure the volume of a solid, we calculate : L x W X H
• To measure the volume of an irregular solid we use volume displacement.
Unit with graduated
cylinder-= mL
Unit with a ruler= cm3
Unit with displaceme
nt-= mL
![Page 5: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/5.jpg)
Calculating DensityCalculating Density• Imagine you had a metal cube that has a
mass of 20.0 grams and a volume 5.0 cm3. What is its density?
D = M__ V
D= 20.0 grams 5.0 cm3
D= 4.0 D= 4.0 _g_ cm3
SHOW ALL WORK!
![Page 6: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/6.jpg)
You try…You try…• The mass of an object is 10.0 grams and its
volume is 4.0mL. What is its density?
D = M__ V
D= 10.0 grams 4.0 mL
D= 2.5
D= 2.5 _g_ mL
SHOW ALL WORK!
![Page 7: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/7.jpg)
The Density of WaterThe Density of Water• The mass of water is 10.0 grams and its volume
is 10.0mL. What is its density?
D = M__ V
D= 10.0 grams 10.0 mLD= 1.0
D= 1.0 _g_ mL
THE DENSITY OF WATER IS 1.0!
SHOW ALL WORK!
![Page 8: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/8.jpg)
Will it sink or float?Will it sink or float?• If an object has a density greater than
water (1.0), it will sink.• If an object has a density less than water
(1.0), it will float.
Less than 1.0
More than 1.0
![Page 9: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/9.jpg)
Liquid LayersLiquid Layers• If you pour together
liquids that don’t mix and have different densities, they will form liquid layers.
• The liquid with the highest density will be on the bottom.
• The liquid with the lowest density will be on the top.
![Page 10: How to Calculate Density. How do we know the density of a substance? We can’t see the molecules inside a substance to know how dense it is. Instead we.](https://reader036.fdocuments.us/reader036/viewer/2022082517/56649d9f5503460f94a8a325/html5/thumbnails/10.jpg)
Check out this picture Check out this picture • Which layer has the highest
density?• Which layer has the lowest
density?• Imagine that the liquids
have the following densities: 10.0 g/cm3
3.0 g/cm3
6.0 g/cm3
5.0 g/cm3
• Which number would go with which layer? 1
0
6
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