bellringer 11-7-2013
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Bellringer 11-7-2013. What are the 2 most basic categories of matter? If you shine a flashlight through a glass of KoolAid and then a glass of water with a little milk mixed in, which one(s) would you see the light beam going through the glass? a. Kool-Aidb. Milky waterc. Both. - PowerPoint PPT PresentationTRANSCRIPT
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Bellringer 11-7-20131. What are the 2 most basic
categories of matter?2. If you shine a flashlight through a
glass of KoolAid and then a glass of water with a little milk mixed in, which one(s) would you see the light beam going through the glass?
a. Kool-Aid b. Milky waterc. Both
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What is Matter? It has mass and takes up
space Everything around us is matter
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ON A PIECE OF NOTEBOOK PAPER, MAKE THE FOLLOWING GRAPHIC ORGANIZERPhysical Properties Chemical
Properties
Physical Changes Chemical Changes
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Physical Properties Definition: can be observed without
altering the chemical composition of a substance
Examples: color, texture, malleability, solubility, mass, volume, density
Malleable: capable of being extended or shaped by beating
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Play Dough: Physical Properties
Color?Texture?Malleability?Mass?Solubility?
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Physical PropertiesPhysical properties can be described as being intensive or extensive.
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Extensive Properties:•Dependent on size.•volume, mass, and length
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Intensive Properties:•do not change with the sample size
•can be useful in identifying a substance
color, density, viscosity, temperature, solubility, and states of matter.
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Chemical PropertiesDefinition: the ability of a
substance to combine with or change with other substances.
Toxicity, reactivity, flammability, radioactivity
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Play Dough: Chemical Properties
Toxicity Reactivity Flammabilit
y Radioactivi
ty
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#1The boiling point of a certain alcohol is 75 degrees CelsiusPhysic
al
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#2Copper forms green copper carbonate when in contact with moist airChemic
al
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#3Table salt dissolves in water Physic
al
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#4Copper is a good conductor of heat and electricity
Physical
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#5Magnesium burns brightly when ignitedChemic
al
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#6Iron is more dense than aluminum
Physical
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What’s the Difference? Matter can change Examples: Freeze, cut, burn,
etc. 2 types of changes
1. Physical changes2. Chemical changes
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Physical Changes Definition: when the state or
form of matter is changed physically or mechanically
Clue: still the same stuff Examples: breaking, cutting, freezing,
melting, etc. Ask yourself…”Can it be turned back into how it started?” Yes
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Chemical Change Definition: takes place on a
molecular level (reaction) and produces a new chemical substance.
Clue: new stuff, color etc. A chemical change always
involves a chemical reaction
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Where is the Evidence???
Evidence of chemical change: color change, gas production, and release of heat, light, odor, or sound.
Examples: Burning (combustion), rusting, tarnishing and fermenting
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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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sulfuric acid added to sugar
http://www.youtube.com/watch?v=nqDHwd9rG0s
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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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Exit Ticket: A chemist is looking to describe a chemical
with a intensive property. Which of the following is an intensive property? a. Mass is 6.7gb. Boiling point is 500 Cc. Volume is 4 cm3
Label as physical or chemical: Ice meltingBaking a cake Iron rusting