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
th
 Go over worksheet (5 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 hard
Stroh’s class works even harder
To 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 nonmagnetic 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 water
Ex: 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)
(2)
(3)
(4)
(5)
(6)
(7)
Remove rocks from an ocean water sample.
A solution of salt water.
A mixture of oil and water.
Isolate sugar from a sugar-water solution.
Salt and ammonium chloride mixture (salt is not soluble in
ammonium chloride).
A mixture of paperclips and rice.
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!