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CHEMISTRY the study of matter
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MATTER anything that has mass and has volume
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2 Properties of Matter 1) Mass
A measure of how difficult it is to change the object’s motion (b.k.a. inertia) Units on mass: kilograms, grams, (pounds)
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Massive objects are harder to move
Massive objects are harder to move. Thus they have more matter and more inertia Which has more inertia?
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Weight vs. Mass Weight Mass
Depends on gravity (changes depending on where you are) Stays the same EVERYWHERE!!!
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2 Properties of Matter 2) Volume
The amount of space an object occupies Units on volume: milliliters, liters, (cup, gallon)
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An object’s volume can be found in 4 basic ways:
Multiplying dimensions together (lwh, πr2h,4/3 πr3) Volume displacement Using a liquid measure (mL) As a derived unit (D=m/v)
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The ratio of an object’s mass to its volume
Density The ratio of an object’s mass to its volume
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Units: g/mL, g/cm3
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Anything with a density of GREATER than 1g/mL will sink in water.
Anything with a density LESS than 1g/mL will float in water.
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A block of wood has a mass of 28 grams
A block of wood has a mass of 28 grams. If its volume is 14 cm3, what is the density of the wood? 2.0 g/cm3
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The density of gold is 19. 3 g/mL
The density of gold is 19.3 g/mL. What is the mass of a piece of gold with a volume of 34.5 mL? 666 grams
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Air has a density of 0. 0013 g/mL
Air has a density of g/mL. How much volume does 48,000 grams of air take up? 3.7 x 107 mL
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What is the density of sand?
PROBLEM What is the density of sand?
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Are your 10 pennies made before 1982 or after 1982?
PROBLEM Are your 10 pennies made before 1982 or after 1982?
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How close a measurement is the correct or true measurement
Accuracy How close a measurement is the correct or true measurement
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Precision How close a set of measurements are to each other (regardless of how correct they are)
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A quantitative comparison between your value and an accepted value
% Error A quantitative comparison between your value and an accepted value
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Calculate the % error in your measurement!
Your value for water density = 0.88 Accepted value for water density = 1.0 Calculate the % error in your measurement!
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