8th Grade Ch. 1 Sec. 2 Measuring Matter
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Transcript of 8th Grade Ch. 1 Sec. 2 Measuring Matter
Ch. 1Ch. 1Sec. 2 Sec. 2
Measuring Measuring MatterMatter
weightweight• depends on force of gravity
mass• Unlike an object’s weight, an
object’s mass will not change if the force of gravity on it changes.
definition formula SI units
massmass
measure of how much matter an object contains
• kilogram (kg)• gram (g)
volumevolume
amount of space that matter occupies
length X width X height
(l.w.h)
• cm3 (solids)• liter (L)• milliliter (mL)
densitydensity
measure of how much mass is in a given volume
mass
volume
• g/cm3
• g/mL
Volume is found by multiplying the measurements of length, width, and
height.
L x W x HL x W x H
Answer= cubic centimeters
(cm3)
How can you measure the volume of an object with an
irregular shape, such as a rock?
• One way is to put the object in a graduated cylinder containing water and measure the change in the volume of the water.
• Answer is in mL not cm3
density
• density of water = 1.0 g/mL
(1.0 g/cm3)
A small block of wood floats on water. It has a volume of 25 cubic
centimeters and a mass of 20 grams. What is the density of the wood?
• Density= Mass
Volume
• Density= 20 g
25 cm3
• Density= 0.8 g/cmDensity= 0.8 g/cm33
Density ProblemsCoin Mass
(g)Volume
(cm3)
Density
(g/cm3)
A 2.5 g 0.5 cm3
B 4.8 g 0.08 cm3
C 7.2 g 2.4 g/cm3
Object Mass (g) Volume (cm3) Density (g/cm3)Whole Whole
Wooden stickWooden stick
Piece 1
Piece 2
Whole Whole Modeling clayModeling clay
Piece 1
Piece 2
Whole CrayonWhole Crayon
Piece 1
Piece 2
RockRock
MarbleMarble
Activity pg. 28 - Making Sense of Density Activity pg. 28 - Making Sense of Density
1.0 g/mL(1.0 g/cm3)
density of water
weightweight
• depends on force of gravity
massmass• Unlike an object’s weight, an object’s ____
will not change if the force of gravity on it changes.
massmass• measure of how much matter an object contains
volumevolumeamount of space that
matter occupies
densitydensitymeasure of how much
mass is in a given volume
Which liquid has the greatest density? Water, corn syrup, or
vegetable oil?• Hypothesis: I
predict that the ________ will have the greatest density because _______________.
• Observations: ______________
3. Corn syrup
2. Water
1. Vegetable oil
3.
2.
1.
Before
After
Matter of DensityObject Floats or sinks Density compared
to water
Marble
Wood
Ironwood
Japanese yen
Granite
Pumice rock
Penny