way back wednesday! catalyst – april [prime # between 5 and 11], 2010 name fecl 2 how many...
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WAY BACK WEDNESDAY!Catalyst – April [prime # between 5 and 11], 2010
Name FeCl2
How many protons, neutrons, and electrons are in Chlorine-40?
What are two differences of ionic and covalent bonds?
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Today’s Agenda
Catalyst Go over worksheet (5th only) Physical/Chemical Change Lab
Stations (45 minutes) Intro notes on separating
mixtures Exit Question
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Today’s Objectives
SWBAT describe matter using physical and chemical properties.
SWBAT observe and distinguish between physical and chemical changes.
SWBAT begin to learn about separating mixtures.
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Review
Physical or Chemical Change?
A physical change is a change, but only physical properties change
A chemical change is also a change, but it forms a new substance
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Evidence of Physical Change
Bending, breaking, smashing, freezing, melting, evaporating,
crushing, cutting, tearing, sanding, grinding, mixing, separating, dissolving...
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Evidence of Chemical Change
Fizzing, burning or combustion, corrosion, production of odor, heat,
cold, light, rust, solids, smoke, decomposition, oxidation, rotting,
digestion…
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Physical and Chemical Change Lab Stations There are EIGHT stations Each group will go to each station for 5
minutes FIVE LAB STATIONS, TWO QUESTION
STATIONS, ONE HAIKU STATION During the Haiku stations, you will be required
to work on a Chemistry Haiku (5-7-5) You must include the Haiku in order to get credit
for the day’s work, so I expect you to be working the entire time
More Haikus for extra points!
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What’s a Haiku?
A short 3-line poem with a certain number of syllables on each line First line: 5 syllables Second line: 7 syllables Third line: 5 syllables 5-7-5!
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Ms. Stroh’s Haiku
LY’s class works hardStroh’s class works
even harderTo become masters!
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Alternative Assignment
If you weren’t here yesterday or didn’t do your homework… Complete Unit 4 Resume (Homework) Write one Chemistry Haiku Bookwork:
Read pages 66-69 and answer questions 15-19 (on page 69)
Read pages 70-74 and answer questions 25, 29 (on page 77)
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Mixtures….of whaaaaat?!?!?
Key Point #1: Mixtures are PHYSICALLY combined, so they can be PHYSICALLY separated.
A mixture is a combination of two or more substances in which each substance keeps its individual chemical properties.
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Let’s look at some mixtures…
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Why is separation of mixtures so important in chemistry?
When you perform reactions, you must often isolate certain products…
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Real-Life Examples of Separating Mixtures Separating components of blood
Separating oil from water in an oil spill
Getting drinkable water in third world countries
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How you do that?
Key Point #2: Chemists separate mixtures by using differences in physical properties of each part.
Physical Properties: Size Density Solubility Magnetism Boiling Point
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Physical Properties that can be different: Size:
Ex. Big Grizzly Bear and little Ida Henry Density : Will it float or sink in water? OR Which is
more dense? Ex. Toothpicks and paper clips; Ex. Water and oil
Solubility: Will it dissolve in water? Ex. Rocks and sugar
Magnetism: Is it magnetic? Ex. Paper and metal clippings
Boiling Point : At what temperature does it boil? Ex. Water and oil
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Density
Based off differences in density, you can separate liquids from each other
Ex: Oil and Water
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Magnetism
Based on differences is magnetism, you can separate magnetic objects from non-magnetic objects
Ex: Rocks and Coins
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SEPARATION TECHNIQUES
Key Point #3: Filtration separates a solid from a liquid by filtering out the liquid.
Ex. sand and water mixture
What physical property is being utilized here?
Utilizes the solubility and density of the solid
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Filtration
Based on differences in phase state, you can separate solids from liquids using filtration
Ex: Sand and waterEx: Spaghetti and water
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Filtration
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Crystallization
Based on differences in boiling points, you can separate dissolved solids from liquids
Ex: Boil salt water to crystallize salt and evaporate water
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SEPARATION TECHNIQUES
Key Point #5: Crystallization separates a solid that has been dissolved in a liquid by boiling off the liquid.
Ex. salt water mixture
What physical property is being utilized here? Utilizes different boiling points of each
substance
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Distillation
Based on differences in boiling points, you can separate two liquids from each other.
Liquid A has a boiling point of 100°C Liquid B has a boiling point of 110°C
How could I separate these two mixtures?
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SEPARATION TECHNIQUES
Key Point #4: Distillation separates two liquids from each other by boiling off one liquid at a time.
Ex. water and alcohol mixture.
What physical property is being utilized here? Utilizes the differing boiling points of each
substance
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Individual Whiteboard:Identify the technique (filtration,
distillation, or crystallization) you would use to separate the following mixtures:
(1) Remove rocks from an ocean water sample. (2) A solution of salt water.(3) A mixture of oil and water.(4) Isolate sugar from a sugar-water solution.(5) Salt and ammonium chloride mixture (salt is
not soluble in ammonium chloride).(6) A mixture of paperclips and rice.(7) A mixture of water and oil.
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Separation Challenge
Problem: You have a mixture of sand, salt, wood chips, and iron fillings. It is your job to successfully separate all of these components.
Possible Materials to use: Magnets Distilled water Funnel Filter paper Hot plate Watch glass Spoon beaker
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Precipitation Reactions and Filtration
BaCl2(aq) + Na2SO4(aq) BaSO4(s) + 2NaCl(aq)
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Exit Question
Jose found a mixture of pennies dissolved in salt water. Make a procedure for separating each component.
*Remember use the differences between the parts!