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Transcript of Do Now How many grams are in one kg? 1000 How many slices are in a pizza? varies How many cm...
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Do NowHow many grams are in one kg?
1000
How many slices are in a pizza?varies
How many cm are in an inch (from lab)?2.54
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Dimensional AnalysisUnit 1: Matter & Measurement
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English-> SI Conversions
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Common Conversions 1.06 quart = 1 Liter
1quart = 946 mL
1 pound = 454 grams
1kg = 2.2 lbs
1 inch = 2.54 cm
1 cm3 = 1mL
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CONVERSION FACTORSRatio of two equivalent
measurements-Used to convert between systems
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Conversion Factors
HAVE
WANT
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Let’s Practice7 grams= _____lbs?
Want= lbsHave= grams
7g x1 lb
454g
=0.02 lbs
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Why Does This Work? The given units (what you have) are
canceled out!
7g x1 lb
454g
=0.02 lbs
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Let’s Practice
19L = _____quarts?Want= quartsHave = Liters
19Lx1.06 quart
1L=20 quarts
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Let’s Practice9.5 inches = ______ cm?
Want = cmHave = inches
9.5 inx2.54 cm1 in
=24.13 cm
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Your Height What is your height in
inches? **HINT** 5 feet = 60 inches
Convert your height in inches to centimeters.
Then convert your height in centimeters to meters.
62 inches
62 inches X 1 inch 2.54 cm
= 157.48 cm
K H D B D C M
Move the decimal 2 places to the left.= 1.5748 m
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Upcoming Quiz Tomorrow 9/18!
Metrics Quiz Metric-metric conversions (KHDBDCM) Sig Figs
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Upcoming Homework HW 1.7 - Online Homework (Temperature & Density
Calculations) due TONIGHT 9/17 8pm
HW 1.8 - Read p. 34-37, 42-43, & 48 by Thurs. 9/18/14
HW 1.9 - Read p. 38-39 & 44-47 by Fri. 9/19/14
HW 1.10 - Online Homework (Describing Matter) due Fri. 9/19 8pm
HW 1.11 - Read p. 40-41 by Mon. 9/22/14
HW 1.12 - Read p. 49-50 by Tues. 9/23/14
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Properties of MatterUnit 1: Measurement & Matter
Aim: Does matter matter?
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From the HW… Which is heavier: a ton of feathers or a
ton of bowling balls?
THEY ARE THE SAME!!
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Do Now Describe Beyoncé
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Matteranything that has mass and takes up space
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States of MatterGas Liquid Solid
Particle Model
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Properties Gas Liquid SolidParticle Movement“free to move” or“fixed position”Shape“definite” or “takes the shape of the container”
Volume“definite” or “takes the volume of the container”
Free to move
Free to move
Fixed position
Takes the shape of the container
Takes the shape of the container
Definite shape
Takes the volume of the container
Definite volume
Definite volume
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Properties used to describe matter; characteristics by
which a substance is recognized
Extensive Depend on amount of matter present
ie: volume, mass, length, width, etc
Intensive ONLY depends on type of matter present
ie: boiling and melting points; density Used to identify substances
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Physical propertyQuality or condition of a substance that can be observed/measured without changing the substance’s composition
ie: color, taste, luster, malleable, conductivity
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Chemical properties Describe how a substance interacts (or
doesn’t interact) in the presence of another substance to produce new substances
Out with the old-> in with the new
ie: iron reacts with air and forms rust; nitrogen gas really doesn’t react with much of anything under most conditions
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Matter changes
Nothing stays the same
Of course scientists have categories for that too!
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Physical Changeswhen the state or form of matter is changed without changing its chemical properties or composition.
Examples: cutting, freezing, melting, etc.
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Chemical Change
change that produces 1+ new substances that differ in chemical properties and composition from the original substance.
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Name That Change!!
Think= silently to yourself and decide what type of change is represented by the slide
Share=class vote
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ice melting
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burning a chemistry book
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melting iron
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frying an egg
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fireworks exploding in the sky
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turning wood into a baseball bat
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baking a cake
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sharpening a pencil
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carving a watermelon into a creepy looking face
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pouring liquid nitrogen into a bowl and watching it vaporize
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sulfuric acid added to sugar
http://www.youtube.com/watch?v=nqDHwd9rG0s
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You Decide…
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Read the following paragraph to answer questions 1 and 2:
A match is lit and held under a cold piece of metal. The following observations are made:The match burns. The metal gets warmer. Water condenses on the metal. Black soot (carbon) is deposited on the metal.
1. What is one physical change from the above paragraph? Why is it a physical change?
2. What is one chemical change from the above paragraph? Why is it a chemical change?
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In Conclusion…How can scientists describe matter?
Propertieso Extensive & intensiveo Physical & chemical
Changeso Physical & chemical
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Elements to Memorize Know the element name & symbol!
Hydrogen = Iron = Au = He =
Quiz on Wednesday 9/24
H
Fe
Gold
Helium
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Upcoming HomeworkHW 1.9 - Read p. 38-39 & 44-47 by Fri.
9/19/14
HW 1.10 - Online Homework (Describing Matter) due Fri. 9/19 8pm
HW 1.11 - Read p. 40-41 by Mon. 9/22/14
HW 1.12 - Read p. 49-50 by Tues. 9/23/14