1. Vocabulary chapter 18, section 1 and 2 Page 528 and 540 10 words
Homework
Vocabulary chapter 18, section 1 and 2 Page 528 and words

2. Bell Work – write question, answer and explanation 9-24-11
A substance is mixed into a solution. If there is no chemical reaction, what will happen when the liquid is evaporated out of the mixture?
The container will be empty
The container will have residue of the solid that was originally dissolved
The mixture cannot evaporate
None of the above

3. Homework
Read ch. 18 section 1: Page 528 to 539 Answer questions 1-5 at the end of the section (p 539) GET TEST PAPER SIGNED!!!

4. Bell Work – write question, answer and explanation 9-28-11
Carbonation is mixing a gas into a liquid such as when soda pop drinks are made. Which answer is correct? Explain your answer.
This is a chemical change
This is a physical change
Gas cannot be mixed into a liquid
The gas is the solvent and the liquid is the solute of the solution

5. Homework
Read chapter 18 section 2: Page 540 to 546 Answer questions 1-5 at the end of the section (p 546) QUIZ TOMORROW

6. Anything that has mass and takes up space. STUFF!
What is Matter?
Anything that has mass and takes up space.
STUFF!

7. What instrument is used to measure mass?
A balance
Scales are used to measure weight.

8. What are some examples of matter?
List some……
What about air, is it matter? Does it have mass?

9. What are the three most common states of matter?
1. solid
2. liquid
3. Gas
Lets demonstrate!!!!!!!!!
See particle movement for each phase

10. Demonstration
Lets create our own Human Molecules Demonstration!!!

11. 2 other states of matter…..
Plasma
(super excited and super hot atoms)
*examples: neon signs, ball lightening, stars
Bose Einstein condensate
(super unexcited and super cold atoms)
See States of Matter

12. The Water Cycle is an example of state changes in nature
Water from Earth evaporates into water vapor
Because it heats up
Water vapor condenses and forms clouds
Because it cools down
It can become ice, snow or hail if it cools enough
Water precipitates as and it all starts over again!

13. Can you name other state changes we observe?

14. Can you name other state changes we observe?
Chocolate in a hot car melts
Solid to liquid
Will it become a solid again?
Is it still chocolate?
Then it is still the same substance so it is a physical change.
What about cheese, plastic, popsicles…?

15. The state of matter a substance is at room temperature is a physical property that can be used to identify the substance.
What is water at room temperature?
What is plastic at room temperature?
What is helium at room temperature?

16. What causes the states of matter to change?
ENERGY…
Heat added changes a solid to liquid to gas
Heat taken away changes gas to liquid to solid

17. What are the changes of matter called?
Solid to liquid…..melting
Liquid to solid…..freezing
Liquid to gas…..evaporation
Gas to liquid….condensation
Solid to gas….sublimation

18. What determines how fast the state of matter changes?
Pressure and heat
The starting temperature
The amount of the substance that undergoes change
The amount of heat that is applied to the substance
The surface area is another factor that determines how fast a substance will melt or boil.

19. How do we describe matter?
Physical properties
Chemical properties

20. Physical properties
Properties that do not change the chemical nature of the substance
Link

21. Physical Property Description Color, Shape, Length, Mass Volume
Amount of space an object takes up
Density
D=m/v
solubility
Ability to Dissolve
Boiling point
At 1 atmosphere water boils at: 100 oC Fahrenheit K
Freezing point
0 oC or 32 Fahrenheit
Melting Point
Point at which a solid becomes a liquid
magnetic

22. Physical Property
Description
ductility
malleability

23. Chromatography
Chromatography is a method for separating substances in some mixtures.
Different substances of the mixture have different solubility rates.
If the substance is very soluble, it moves up the paper quickly.
If the substance is less soluble, it creeps along very slowly.

24. Physical Changes Observe some examples.
What about solubility and phase changes?

25. Mixture
A mixture is made of two or more substances that come together, but DO NOT CHEMICALLY combine.
Homogenous mixtures: are evenly mixed
Like tea or Koolaide
Heterogeneous mixtures: are unevenly mixed
Like a pizza or salad

26. Solution
A solution is a mixture in which the different particles are tiny and are mixed completely evenly
EXAMPLES:
Liquid dissolved in liquid (sugar in water)
Liquids dissolved in other liquids (water in alcohol)
Gas dissolved in a gas (oxygen dissolved in the nitrogen in the air)
Gas dissolved in a liquid (carbonated drink)

27. Soluble
The ability to be dissolved.

28. What determines solubility?
The temperature and the amount of the solvent

29. What is the difference between solute and solvent
Solute: The dissolved substance in a solution.
( sugar and tea dissolved in water)
Solvent: The dissolving agent in the solution, usually a liquid such as water.
( Water is considered the universal solvent)

30. Precipitate
As the solution cools, the solute will fall out of the mixture.
How is this similar to weather precipitation?

31. Saturated
This is when no more solvent can be dissolved in the solution

32. Chemical Properties
Properties that do change the chemical nature of matter.

33. Chemical Property Description Ability to burn
Ability to react with oxygen pH

34. Acids and Bases: pH

35. Chemical Changes Observe some examples of chemical changes
Hints that indicate a chemical change has taken place: change in temperature, color change, giving off gas – bubbles

36. Physical Change
Chemical Change

37. Compound Compounds can only be broken down by chemical means
They have a fixed ratio or proportion of atoms
An example is water