1. Bellwork: Monday 4/23/2012
Classify the following as either a chemical change or a physical change:
Boiling
Burning
On a molecular level, how would you describe the difference between boiling something, and burning something?
Different Phase- Still same bonds; farther apart, moving faster
Physical Change
Chemical Change
Wednesday 4/14/2010- Burning is a
Chemical change
Physical change
Wednesday 4/14/2010- Boiling is a
Wednesday 4/14/2010- On a molecular level, when the atoms are still bonded the same, but the molecules are organized differently, this is a
Wednesday 4/14/2010- On a molecular level, when the bonds between the atoms have been broken and reformed to create a new substance, this is a
NEW substance- Bonds broken, reformed

2. Think about it…
A garden salad is made up of lettuce, tomatoes, cucumbers, ham, egg, bacon bits, and croutons.
Compare this to dissolving sugar into un-sweet tea.
Hint: think about each of them as different things being mixed together—what is the end result??
The salad is not a uniform mixture (one bite is different from the next) – the salad is a heterogeneous mixture
The tea is a uniform mixture – once dissolved, the sugar is spread out evenly in the tea so one sip tastes like another – the tea is a homogeneous mixture

3. Packet 12, Page 1- Mixtures & Solutions
Compound- two or more substances chemically combined
Only separated by chemical means/reactions
Examples of compounds:
Salt (NaCl) – Sodium & chlorine combined chemically
Water (H2O) – Hydrogen & oxygen combined chemically
Carbon Dioxide (CO2) – Carbon & oxygen combined chemically
Mixture- two or more substances mixed together; NOT chemically combined
Separated by physical means
Examples of mixtures:
Bowl of cereal – mixture of cereal and milk
Trail mix- mixture of various nuts, fruit, candy

4. Take a Guess! Mixture or Compound?
Air – mixture of gases
Soda pop – mixture of soda syrup, water, and CO2 gas
Fog – mixture of water and air
Table salt – compound of Sodium and Chlorine: NaCl
Kool-Aid – mixture of water, sugar, and flavor crystals
Water – compound of Hydrogen and Oxygen: H2O
Salt water – mixture of salt and water
Carbon monoxide – compound of Carbon and Oxygen: CO

5. “Uniform” means the same throughout
6.19- TSW USE EVIDENCE TO COMPARE AND CONTRAST HOMOGENEOUS AND HETEROGENEOUS MIXTURES.
Heterogeneous mixture- a mixture in which the properties are not uniform (ex. beef stew, garden salad)
“Uniform” means the same throughout
Suspension- *solid is not dissolved* Very fine particles of solid mixed with a liquid; often looks cloudy; eventually solid settles to the bottom
Sediment- *solid is not dissolved and settles to the bottom*

6. Solute- is dissolved (s, l, g)
Homogeneous mixture- a mixture in which the properties are uniform (ex. sweetened tea)
Solution- *solid is dissolved* mixture in which one substance is dissolved in another; has two parts:
Solute- is dissolved (s, l, g)
Solvent- does the dissolving (s, l, g—usually liquid)
*The solute is present in a smaller amount than the solvent*

7. Solubility- How well a solute will dissolve in a solvent
Insoluble- does not dissolve in water
Soluble- does dissolve in water

8. 6.21- TSW IDENTIFY THE SOLUTE AND SOLVENT IN A SOLUTION.
Lemonade
Soda pop
Ocean water
Sugar (s) and Lemon Juice (l); Lemonade powder (s)
Water (l)
CO2 – (g) carbonation/bubbles
Water (l) & Syrup (l)
Salt (s)
Water (l)
(s) Means it is a SOLID; (l) LIQUID; (g) GAS

9. Matter: Pure Substances vs. Mixtures Packet 12, Page 2
Solid, liquid, gas
Pure Substance
Constant Composition; Can write chemical formula, homogeneous
Element
One type of atom
Compound
Two or more different types of atoms chemically bonded
Mixture
Variable Composition
Homogeneous
solutions
Heterogeneous
Colloids and suspensions

10. In-Class Work: Page 2- Classify Substance vs. Mixture
Type of Matter
Substance- Element or Compound?
Mixture- Heterogeneous or Homogeneous?
Chlorine
Water
Soil
Sugar water
Oxygen
Carbon dioxide
Rocky road ice cream
Pure air
Silver
Ethyl alcohol (C2H5OH)
Aluminum
Table salt (NaCl)
Sugar
Seawater
Chocolate chip cookie dough
Vanilla ice cream
Element
Compound
Heterogeneous 
Homogeneous
Element
Compound
Heterogeneous 
Homogeneous
Element
Compound
Element
Compound
Compound
Homogeneous
Heterogeneous 
Homogeneous

11. Page 5- Separating Mixtures Using Physical Methods: 6
Page 5- Separating Mixtures Using Physical Methods: TSW SEPARATE MIXTURES USING THE FOLLOWING PHYSICAL MEANS: FILTERING, MAGNETISM, DISSOLVING, AND EVAPORATION.
Filtration- separates a solid (or suspension) from a liquid
Example: separate dirt from some salty water
How it works: The liquid (and anything dissolved in the liquid) passes through holes in the filter paper. The solid particles are too big and get stuck.
Magnetism- separates objects with magnetic properties, from non-magnetic objects
Example: separate iron from sand
How it works: The magnet sticks to the iron, not the sand.

12. Dissolving- causes solid matter to pass into a liquid solution; “disappears”
Example: the dissolving of salt in water
How it works: Soluble solids will dissolve, while insoluble solids will not
Evaporation- separates a dissolved SOLUTE from a SOLUTION
Example: obtain some pure salt from salty water
How it works: When salty water is warmed the water evaporates leaving behind crystals of salt.

13. Paper Chromatography- separates the different colors in dyes
Example: separate the different colored dyes in ink pens
How it works: Place a dot of the dye to separate, on chromatography paper, and then dip it into a solvent. As the solvent soaks up through the paper it carries the dye with it. The more soluble dyes move further up than the less soluble ones, hence separating from each other.

14. In-Class Work: Page 4 Circle/write correct answers
Whatever is not finished is homework!

15. Bellwork: Tuesday 4/24/2012
Choose one of the five separation techniques we have studied so far and describe how they can be used to separate a mixture, and what they separate.
Evaporation – how / what
Magnetism – how / what
Filtration – how / what
Dissolving – how / what
Chromatography – how / what
The process that separates substances in a heterogeneous mixture through the use of a screen, coffee filter, mesh, etc., is called ________________.
Evaporation
Magnetism
Filtration
Chromatography
Salt flats in Nevada’s deserts are remnants of an ancient sea. What process separated the salt from the ancient ocean?

16. Separating Mixtures Lab- Page 5
Objective: Students will design, conduct, and justify an experimental design in which they combine sand, iron filings, gravel, and salt, and then use physical means to separate the mixture.
Data Table
Procedures
Conclusion Questions
We will be working on this lab for one day. Your mixture should be completely separated by the end of today.

17. Separating Mixtures Lab Procedures - Page 5
Part 1 Procedure:
Measure and record the “original mass” of the sand, iron fillings, gravel, and salt in the data table on pg. 6.
Combine the sand, iron fillings, gravel, and salt in a beaker; stir until the substances are a complete jumble!
Challenge:
Along with your partners, you must now find a way to separate the jumble that you have created in your beaker back into the original substances: sand, iron fillings, gravel, and salt.
You may only use the tools you have been given!
Use Part 2 Procedure on pg. 6 to complete the challenge!
We don’t have a hot plate or blow dryer so MEASURE THE MASS OF WATER IF YOU USE IT!!

18. Separating Mixtures Review
Filtration- separate a solid or suspension from a liquid
separating SAND from water
Magnetism- separate magnetic objects from non-magnetic objects
separating iron from salt
Dissolving- causes solid matter to pass into a liquid solution; “disappears”
Evaporation- used to obtain the solute from a solution
obtaining SALT from salty water
Chromatography- used to separate out one color from a mixture of colors
separating out the colors in black ink

19. Answer the following questions on your bellwork.
Bellwork: Thursday 4/26/12
Answer the following questions on your bellwork.
In the lab we did yesterday, what separation techniques worked for you and which ones did not?
Write the order of separation that you found to be the best.

20. 1. Filter the large gravel from the sand, salt, iron mixture.
2. Add water to the salt and sand mixture.
3. Shake well until the salt dissolves. The sand does not dissolve.
4. Filtration: Use the filter paper and the funnel to filter into the beaker. The salt solution passes through the paper. The sand remains behind on the paper.
5. Evaporation: Put the salt solution in the evaporating basin and heat with the Bunsen burner. The water is evaporated.  White salt crystals will be left behind.
6. You can dry the sand by carefully heating the wet filter paper.
7. You should now be left with separate piles of salt and sand!!