today’s catalyst 1. what is an intensive property of matter? list two examples of intensive...
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Today’s Catalyst 3. Compare these two elephants. What would be an intensive property of the elephants? What would be an extensive property of the elephants?TRANSCRIPT
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Today’s Catalyst1. What is an intensive property of matter? List two examples of intensive properties. 2. What is an extensive property of matter? List two examples of extensive properties.
Do not depend upon the amount of matter present; color, density
Do depend upon the amount of matter present; mass, volume
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Today’s Catalyst
3. Compare these two elephants. What would be an intensive property of the elephants? What would be an extensive property of the elephants?
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https://www.youtube.com/watch?v=88MBCyiaPSM
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Pure Substances and Mixtures
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By the end of the class period today I will be able to…Identify a piece of matter as an element, compound, homogeneous, or heterogeneous mixture based upon its properties
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Pure SubstancesComposition is the same throughout and
does not vary from sample to sample.
CANNOT be broken down by physical changes
Can be an element or compound.
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ElementDefinition: substances in their simplest formsCannot be broken down by a physical or chemical change
Found on the periodic tableMade up of one type of atom
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Examples of Elements:HydrogenCarbonLithiumGold
What are two other examples of elements not listed above? What do all elements have in common?
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CompoundDefinition: substance formed by the
chemical combination of two or more elementscan be broken into simpler substances by a chemical change
+ = Compound
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A compound is always composed of the same elements in the same proportions.
In other words, Carbon Dioxide (CO2) is always composed of 1 atom of C and 2 atoms of O.
If there are different amounts of carbon or oxygen, it is no longer carbon dioxide.
Law of Definite Proportions
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More Examples of Compounds
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MixtureDefinition: two or more pure substances (elements or compounds) that are mixed together but NOT joined chemicallyNOT a pure substanceExamples: The air we breath, gasoline for cars, the sidewalk on which we walk
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Homogeneous MixturesUniform in composition and
appearance
Same proportion of components throughout
Consists of two or more substances in the same phase
Also called solutions
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Heterogeneous Mixturesvariable appearance and composition
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Raise ‘em Up!Look at the following example and with your partner determine if it is a heterogeneous mixture, homogeneous mixture, element, or compound
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Chicken Noodle Soup
Heterogeneous Mixture
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Pure Water
Compound
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Tap Water
Homogeneous Mixture
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Pure Gold
Element
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Coca-Cola
Homogeneous Mixture
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Kool Aid has mass and takes
up space
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Can be separated
by allowing water to
evaporate
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Same composition throughout
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Wrapping up!In 1-2 STRONG sentences…under your flow-chart…
Why is it DIFFICULT to classify matter??
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HOMEWORK!!!Complete the 2-sided Pure Substance and
Mixtures Homework sheet – due tomorrow! We will go over ALL correct answers tomorrow!!
TEST coming THURSDAY SEPTEMBER 17th !!! Covers: Physical/Chemical Properties AND
Changes, States of Matter, and Pure Substances and Mixtures!!