1. 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

2. 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

3. Quiz 1. Which of the following is not an example of matter? Air Liquid
Love
A pencil

4. Quiz
Chocolate is left in a car on a hot summer day. Which picture best represents the molecules of that chocolate?
a b c.

5. Quiz
3. Which answer best represents helium at room temperature? a. b. c.

6. Quiz
4. Which answer is not true about the molecules this picture represents?
The molecules are not moving at all
The molecules are vibrating
The molecules do not have enough energy to break away from each other
This picture represents the molecules of a solid

7. Quiz
5. Which can be used as an example of the 3 most common states of matter changing phases in real life?
chocolate melting
a popsicle freezing
bread baking
the water cycle

8. Quiz 6. Which vocabulary word describes a liquid changing to a gas?
melting
condensation
evaporation
sublimation

9. Quiz
7. Water and salt are mixed in a solution. Which of the following can be used to separate the substances of that mixture?
melting
plasma
freezing
evaporation

10. Quiz
8. Which of the following is not an example of a physical property?
Boiling point
Volume
The ability to burn
Magnetism

11. Quiz
9. What is the name of the method that uses rates of solubility to separate substances? The individual colors used to make black ink can be discovered this way.
evaporation
chromatography
Sublimation
photography

12. Quiz
10. When we separated the black ink, the blue color was on top? Why
It is the hardest to dissolve
It has less mass, so it floated to the top
It is insoluble
d. It is the most soluble

13. Grade Bonus +5 -0 = 30 -1 = 27 -2 = 24 -3 = 21 -4 = 18 -5 = 15 -6 = 12
-7 = 9
-8 = 6
-9 = 3
Bonus +5

14. Quiz
BONUS: Explain why the center of the Earth is thought to be made of solid iron and nickel instead of liquid or gaseous iron and nickel? It is the hottest place in the Earth, so how can this be?

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

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

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

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

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

20. 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

21. 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!

22. Can you name other state changes we observe?

23. 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…?

24. 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?

25. 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

26. 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

27. 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.

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

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

30. 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

31. Physical Property Description ductility
Metal can be pulled into a wire
malleability
Metal can be pressed or hammered into sheets
viscosity
Thickness of a liquid
Ex. Water vs syrup

32. 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.

33. Physical Changes Observe some examples.
What about solutions, mixtures and phase changes?
They are examples of physical changes.

34. 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

35. Solution
A solution is a mixture in which the different particles are tiny and are mixed completely evenly
EXAMPLES:
Solid 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)

36. Soluble
The ability to be dissolved.

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

38. 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)

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

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

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

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

43. Acids and Bases: pH

44. 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

45. Physical Change Chemical Change Torn paper – change in shape or size
burning
State of matter change
baking
Dissolved substances
mixtures
rusting
Reacting chemically
SIGNS OF CHEMICAL CHANGE:
Odor, color change, fizzing bubbles, temperature change

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