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?
Today’s Agenda
Catalyst Go over worksheet (5th only) Physical/Chemical Change Lab
Stations (45 minutes) Intro notes on separating
mixtures Exit Question
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.
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
Evidence of Physical Change
Bending, breaking, smashing, freezing, melting, evaporating,
crushing, cutting, tearing, sanding, grinding, mixing, separating, dissolving...
Evidence of Chemical Change
Fizzing, burning or combustion, corrosion, production of odor, heat,
cold, light, rust, solids, smoke, decomposition, oxidation, rotting,
digestion…
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!
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!
Ms. Stroh’s Haiku
LY’s class works hardStroh’s class works
even harderTo become masters!
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)
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.
Let’s look at some mixtures…
Why is separation of mixtures so important in chemistry?
When you perform reactions, you must often isolate certain products…
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
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
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
Density
Based off differences in density, you can separate liquids from each other
Ex: Oil and Water
Magnetism
Based on differences is magnetism, you can separate magnetic objects from non-magnetic objects
Ex: Rocks and Coins
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
Filtration
Based on differences in phase state, you can separate solids from liquids using filtration
Ex: Sand and waterEx: Spaghetti and water
Filtration
Crystallization
Based on differences in boiling points, you can separate dissolved solids from liquids
Ex: Boil salt water to crystallize salt and evaporate water
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
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?
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
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.
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
Precipitation Reactions and Filtration
BaCl2(aq) + Na2SO4(aq) BaSO4(s) + 2NaCl(aq)
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!
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