1. 5 Minute Check 09/26/16
What is the relationship between an element and a molecule?
What is the relationship between an element and an atom?
Draw the model of Argon
Today’s Standard:
MS-PS1-2 - Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

2. Taking Care of business
Today we are turning in our projects and offering if anyone would like to present their projects to the class.

3. Word Wall
We have a new word added to our word wall
Molecule

4. Unit 3 Fill in our NAME!!! Then fill in the K and the W Date
Assignment title
Page #
Fill in our NAME!!!
Then fill in the K and the W

5. Physical and Chemical Changes
U10

6. 5 Minute Check 09/27/16 What are physical properties?
What are chemical properties?
Can you think of any examples of either?
Today’s Standard:
MS-PS1-2 - Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

7. Taking Care of business
Yesterday we turned in our molecule project if you did not turn it in yesterday you can turn in today for reduced credit.
Yesterday we started a new table of contents for Unit 3

8. Unit 3 Date Assignment title Page # 09/27/16
Physical and Chemical Changes 1

9. Let’s review matter
Every element is unique in some way from all others.
If you know enough about a substance, you can figure out what it is.
If you know what a substance is, you can then know all types of things about it.

10. Matter All matter has 2 types of properties:
Physical properties and chemical properties.

11. Physical Property
A physical property is a characteristic of a substance that can be observed without changing the substance into another substance.
(You can see it without changing what you’re looking at into something else.)

12. Physical Properties Physical properties can be extensive or intensive:
Extensive properties depend on the amount of a substance that you have.
Intensive properties don’t depend on how much you have.

13. Physical Properties Examples of extensive physical properties include:
Volume
Mass
Weight
Size

14. Physical Properties Examples of intensive physical properties include:
Density
Melting point
Boiling point

15. Physical Properties Other physical properties include: Color Hardness
Odor
Taste
State of matter
Texture
Luster (shine)
Flexibility
Heat conductivity
Electrical conductivity
Solubility (ability to dissolve in water.)
Shape
Viscosity
Ductility
Malleability

16. Physical Properties
List as many physical properties as you can for this item:

17. Physical Change
A Physical change is a change in a substance that does not change what the substance is.

18. Physical Change Examples of physical change include: Change in shape
Change in size
Change in phase
Melting (solid to liquid)
Boiling (liquid to gas)
Evaporation (liquid to gas)
Condensation (gas to liquid)
Freezing (liquid to solid)
Sublimation (solid to gas)
Deposition (gas to solid)

19. Physical Change Physical changes might be caused by: Grinding Cutting
Crushing
Bending
Breaking
Heating/cooling
(change in phase)
squishing

20. Physical Change
Evidence that a physical change has occurred might include:
Change in shape
Change in form
Change in size
Change in phase (This is always a physical change!)
Physical changes are usually reversible

21. Physical Change
What could you do to these items to cause a physical change to occur?

22. Chemical Properties
A Chemical property is a characteristic of a substance that can only be observed by changing it into a different substance.

23. Chemical Properties Examples of chemical properties include:
The ability to burn
Ability to tarnish
Ability to rust
Ability to decompose
Ability to react with other chemicals
Instability
Ability to do acid/base reactions

24. Chemical Properties
List as many chemical properties as you can for this item.

25. Chemical Change
A chemical change is a change in which a substance is changed into a different substance. (You’ve changed what it is.)

26. Chemical Change
Chemical changes occur when a chemical reaction causes bonds between atoms to break or to form.

27. Chemical Change
There are 5 types of chemical reactions that cause chemical changes to occur.

28. Chemical change 1- Composition reactions
Two things come together to form something new
A + B = AB
2H2 + O2  2H2O

29. Chemical change 2- Decomposition reactions
1 thing breaks apart to form 2 or more things.
AB = A + B
2H2O  2H2 + O2

30. Chemical change 3- Single replacement reactions
One atom replaces another atom
A + BC = AC + B or A + BC = AB + C
Mg + 2HCl  H2 + MgCl2

31. Chemical Change 4- Double replacement reactions
Two chemicals switch places
AX + BY = AY + BX
2KI + Pb(NO3)2  PbI2 + 2KNO3

32. Chemical Change 5- Combustion reaction
A substance combines with oxygen and releases energy.
C3H8 (propane) + 5O2  3CO2 + 4H2O

33. Chemical Change
Evidence that a chemical change has occurred might include:
A color change
An odor change
Formation of a precipitate (you mix two liquids and make a solid)
Gas is formed (bubbles)
Changes in physical properties.

34. Chemical Change
During a chemical change energy can be released in the form of:
Heat
Light

35. Chemical change
When a chemical change occurs, energy is either released or absorbed.

36. Chemical change
A chemical reaction that releases energy in the form of heat is called exothermic.
Heat comes OUT
Exo = out
Thermic = heat
It will feel HOT.

37. Chemical change
A chemical reaction that absorbs energy in the form of heat is called endothermic.
Heat goes IN
Endo = in
Thermic = heat
It will feel COLD

38. Chemical and physical properties
So what?

39. Chemical and physical properties – So what?
Titanium is very strong and doesn’t rust, so it is often used in jet engines.
Titanium is also nonallergenic. This, combined with the fact that it is rust proof makes it great for artificial joints as well as piercings.

40. Chemical and physical properties – So what?
Tungsten is usually used as the filament in lightbulbs because it has the highest melting point of any metal.
It glows red hot when electricity runs through it, and it gives off both heat and light.

41. Chemical and physical properties – So what?
Vanadium is heavier and harder than titanium, so mixing a tiny bit of vanadium with steel can make cheap tools that are still very strong.

42. Chemical and physical properties – So what?
Helium is almost completely nonreactive (inert).
It is lighter than air, so it’s great for floating balloons (or making funny voices.)
When electricity runs through helium, it glows a creamy pale peach color.

43. Chemical and physical properties – So what?
In 1943, all US pennies were made of zinc plated steel because copper was being used in the war. The pennies had to be coated with zinc because steel will rust, but zinc won’t.

44. Chemical and physical properties – So what?
Sulfur smells awful. Rotten eggs, onions, and garlic all have sulfur in them. Stink bombs use sulfur to create a bad smell.
Sulfur is also flammable, and it is one of the 3 main ingredients in gun powder.

45. Chemical and physical properties – So what?
Chromium is famous for its intense luster. Chrome plated tools, jewlery, silverware, or car parts are very popular.

46. Physical and Chemical Changes video

47. 5 Minute Check 09/28/16 What is a physical change?
What is a chemical change?
Can you think of any examples of either?
Today’s Standard:
MS-PS1-2 - Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

48. Taking Care of business
If you did not turn in your molecule report please turn it in late

49. Let’s review from yesterday

50. Physical Change
Physical change: a change that occurs that does not change the identity of the substance
Melting ice
Freezing Kool-aid
Tearing paper
Boiling water

51. Chemical Changes
Chemical change: a change that occurs causing the identity of the substance to change
Burning paper
Digesting food
Electrolysis of water
A chemical change is called a chemical reaction

52. Chemical Changes Indicators of a chemical change: Evolution of light
Evolution of heat
Evolution of a gas
Color change
Formation of a precipitate

54. Answer the following 10 questions using:
A for Physical Change
And
B for Chemical Change

55. 1. A. Physical Change B. Chemical Change
Rusting nails

56. 2. A. Physical Change B. Chemical Change
Effervescent tablet

57. 3. A. Physical Change B. Chemical Change
Cut paper

58. 4. A. Physical Change B. Chemical Change
Vinegar and Baking soda

59. 5. A. Physical Change B. Chemical Change
Salt and water

60. 6. A. Physical Change B. Chemical Change
Broken glass

61. 7. A. Physical Change B. Chemical Change
Burning wood

62. 8. A. Physical Change B. Chemical Change
Ice melting

63. 9. A. Physical Change B. Chemical Change
Removing iron filings from a mixture

64. 10. A. Physical Change B. Chemical Change
Boiling water

65. 1. A. Physical Change B. Chemical Change
Answer B. Chemical Change
Rusting nails

66. 2. A. Physical Change B. Chemical Change
Answer B. Chemical Change
Effervescent tablet

67. 3. A. Physical Change B. Chemical Change
Answer A. Physical Change
Cut paper

68. 4. A. Physical Change B. Chemical Change
Answer B. Chemical Change
Vinegar and Baking soda

69. 5. A. Physical Change B. Chemical Change
Answer A. Physical Change
Salt and water

70. 6. A. Physical Change B. Chemical Change
Answer A. Physical Change
Broken glass

71. 7. A. Physical Change B. Chemical Change
Answer B. Chemical Change
Burning wood

72. 8. A. Physical Change B. Chemical Change
Answer A. Physical Change
Ice melting

73. 9. A. Physical Change B. Chemical Change
Answer A. Physical Change
Removing iron filings from a mixture

74. 10. A. Physical Change B. Chemical Change
Answer A. Physical Change
Boiling water

75. Unit 3 Date Assignment title Page # 09/27/16
Physical and Chemical Changes 1
09/28/16
Mystery Powder Investigation (3 Pages) 2

76. ENGAGE
Imagine that you are a crime scene investigator working with the local police department. A suspicious white powder has been found at a local school. This powder may be something harmless, like sugar, or something dangerous, like a chemical agent or drugs. It is your job to identify the substance.
1. What are some examples of physical properties that you could measure in order to identify the powder?
2. What are some examples of chemical properties that you could measure in order to identify the powder?

77. Explore
Investigation Question: Can the way a substance reacts chemically, along with its physical properties, allow you to identify what it is when compared to other similar looking substances?

78. Appearance Procedure
Place a very small amount of the baking soda on a piece of black paper. Look at it using the magnifying lens. Record what you see in Table 1.
Repeat this procedure with each of the powders, individually. Remember to record your observations right away so you do not forget what you observed.
I am going to have each of the powders all ready in the trays so students can just take a tray to their seat to observe

79. 5 Minute Check 09/29/16
Identify the following as either a Physical Change or a Chemical Change.
Cutting paper
Ice melting
Toast Burning
Sawing Wood
Metal Rusting
Disappearing Puddle
Candle Burning
Dry Ice
Today’s Standard:
MS-PS1-2 - Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

80. Taking Care of business
Let’s review from yesterday
We started our lab by examining a variety of different powders. As we looked at each sample we recorded the physical properties for each.

81. Reactions Procedure
Measure exactly 1 tablespoon of baking soda and place the spoonful into one of the compartments of the tray.
Separate the baking soda into 3 piles within its compartment.
Add several drops of water (3–5 drops) to the first pile of baking soda. Observe any reaction and record your observations in Table 1 immediately.
Add several drops of vinegar (3–5 drops) to the second pile of baking soda. Observe any reaction and record your observations in Table 1 immediately.
Add several drops of iodine solution (3–5 drops) to the last pile of baking soda. Observe any reaction and record your observations in Table 1 immediately.
Repeat steps 3–6 with the remaining powders, making sure to place each powder in a separate compartment. Remember to record your observations right away so you do not forget what you observed.

82. 5 Minute Check 09/30/16
What is the difference between a physical property and a chemical property?
Why do we care what an objects physical and chemical properties are?
Today’s Standard:
MS-PS1-2 - Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

83. Taking Care of Business
Yesterday we tested each powder with a different liquid to see its solubility and recorded what reactions occurred.

84. Solubility Procedure
Measure enough baking soda into a 50 mL beaker to cover the bottom of the beaker.
Measure out 25 mL of water using the graduated cylinder and pour it into the beaker.
Using a stir stick, stir the mixture. Observe the solution and record your observations in Table 1.
Thoroughly wash and DRY your breaker and stir stick to reuse it for each of the powders.
Repeat steps 8–10 with the remaining powders, placing each powder in a beaker. Remember to record your observations right away so you do not forget what you observed.

85. Explain
Use the data gathered above and information from previous science lessons to answer the following questions.
1. Which of the procedures measured physical properties? (list all)   
2. Which of the procedures measured chemical properties? (list all)
   
3. Which of the reaction tests resulted in a chemical change occurring to the substances involved? (list all)
4. Choose two of the reactions from question 3 and explain how you know that a chemical change occurred. What were the clues that demonstrated to you that there was a chemical change?