Upload
bennett-butler
View
276
Download
0
Embed Size (px)
DESCRIPTION
We can see the difference in density of different materials when we look at... wood floating on water helium balloons floating in the air
Citation preview
Density
Introduction
Introduction•We can see the difference in density of
different materials when we look at ...•wood floating on water
•helium balloons floating in the air
Introduction•We can see the difference in density of
different materials when we look at ...•iron sinking in water
•lava lamps
Introduction
Properties
Properties•Density is an intensive property of
matter.•The density of matter does not
depend on the amount of matter.•Density does depend on the
composition of the matter
Properties•Density is the mass of the matter
divided by the volume of the matter.
•The density of matter generally decreases as the temperature of the matter increases.
D =mV
Properties•The density of some materials is given
in this chart:MaterialMaterial D (g/mL)D (g/mL) MaterialMaterial D (g/L)D (g/L)
gold 19.3 carbon dioxide 1.83
mercury 13.6 argon 1.66lead 11.4 air 1.20
copper 8.86 helium 0.166corn oil 0.922 hydrogen 0.084water 1.000 methane 0.665
Properties
Doing the Math
Doing the Math•Density is the mass of the matter divided
by the volume of the matter.
•The volume of matter is the mass divided by the density.
•The mass of matter is the density times the volume.
D =mV
V =mD
m = D•V
Doing the Math
Examples
ExamplesExample 1:
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?V = l•w•h = (15 cm)(10. cm)(5.0 cm)
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?V = l•w•h = (15 cm)(10. cm)(5.0 cm) = 750 cm3
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?
D = m V
V = l•w•h = (15 cm)(10. cm)(5.0 cm) = 750 cm3
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?
D = = m 340 gV 750 cm3
V = l•w•h = (15 cm)(10. cm)(5.0 cm) = 750 cm3
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?
D = = = 0.453333333 g/cm3 m 340 gV 750 cm3
V = l•w•h = (15 cm)(10. cm)(5.0 cm) = 750 cm3
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?
D = = = 0.453333333 g/cm3 = 0.45 g/cm3
m 340 gV 750 cm3
V = l•w•h = (15 cm)(10. cm)(5.0 cm) = 750 cm3
ExamplesExample 1:A block of wood has a length of 15 cm, a width of 10. cm, and a height of 5.0 cm. The block also has a mass of 340 g. What is the density of the block?
D = = = 0.453333333 g/cm3 = 0.45 g/cm3
m 340 gV 750 cm3
V = l•w•h = (15 cm)(10. cm)(5.0 cm) = 750 cm3
Examples
ExamplesExample 2:
ExamplesExample 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
Example 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
Examples
D = m V
Example 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
Examples
D = ➔ V = m m V D
Example 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
Examples
D = ➔ V = = m m 37.4 gV D 11.4 g/cm3
Example 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
Examples
D = ➔ V = = = 3.280701754 cm3
m m 37.4 gV D 11.4 g/cm3
Example 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
Examples
D = ➔ V = = = 3.280701754 cm3
m m 37.4 gV D 11.4 g/cm3
V = 3.28 cm3
Example 2:A block of lead has a mass of 37.4 g. Lead has a density of 11.4 g/cm3. What is the volume of the block?
V = 3.28 cm3
Examples
D = ➔ V = = = 3.280701754 cm3
m m 37.4 gV D 11.4 g/cm3
Examples
ExamplesExample 3:
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•l
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm)
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm) = 0.157 cm3
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm) = 0.157 cm3
D = m V
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm) = 0.157 cm3
D = ➔ m V
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm) = 0.157 cm3
D = ➔ m = D•Vm V
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm) = 0.157 cm3
D = ➔ m = D•V = (8.86 g/cm3)(0.157 cm3)
m V
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.05000 cm)2(20.0 cm) = 0.157 cm3
D = ➔ m = D•V = (8.86 g/cm3)(0.157 cm3)
m V m = 1.39 g
ExamplesExample 3:What is the mass of a 20.0 cm length of copper wire with a density of 8.86 g/cm3 and a radius of 0.0500 cm? The volume of a cylinder is V = π•r2•lV = π•r2•l = π(0.0500 cm)2(20.0 cm) = 0.157 cm3
D = ➔ m = D•V = (8.86 g/cm3)(0.157 cm3)
m V m = 1.39 g