1. Water is the UNIVERSAL solvent.
Why?

2. WATER is the UNIVERSAL SOLVENT because it DISSOLVES almost EVERYTHING!

3. WHAT MAKES this WATER SO UNIQUE?

4. WHAT MAKES H2O SO UNIQUE?

5. WHAT MAKES H2O SO UNIQUE?
(ONE-OF-A-KIND)

6. Why is water is so special?

7. Why water is so special…

8. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT

9. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT

10. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
???

11. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
???

12. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
light balloons with & without water

13. Tiered- hand out “SPECIFIC HEAT” wksheet
Students staple. Go over the first few….assign the rest for homework or end-of-class work

14. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
???

15. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form

16. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form

17. (Leave room for #4 LATER!)
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form
____________________________________________________________________________________________________

18. anyways…

19. These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!!
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form

20. Illustrate with students…

21. 1. How does water dissolve so much stuff. 2
1. How does water dissolve so much stuff? Why is it slow to heat up and cool down? How can it float when frozen?

22. volunteers, balloons and stuff

23. A water molecule has a positive side & a negative side.

24. A water molecule has a positive side & a negative side.
Remember the model of our water molecule yesterday

25. Opposite charges attract… like charges repel. Just like a MAGNET

26. OPPOSITE POLES ATTRACT
Magnets have poles…
LIKE POLES REPEL
OPPOSITE POLES ATTRACT

27. Magnets have poles like Earth!
LIKE POLES REPEL
OPPOSITE POLES ATTRACT

28. That’s why we say the WATER MOLECULES have POLARITY!

29. So, EACH H2O molecule acts like a tiny magnet.
AND…
LIKE POLES REPEL
OPPOSITE POLES ATTRACT

30. That’s why we say the WATER MOLECULES have POLARITY!
They ACT LIKE LIKE TINY MAGNETS.

31. Like the magnets that can pull apart piles of metal scrap…

32. Like the magnets that can tear your insides up!

33. “Magnetic”water molecules are great at breaking down solutes to their individual molecules!

34. These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!!
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form

35. When POLAR water molecules act like magnets, more UNIQUE stuff happens.

36. Flowing “magnetic” water molecules are in a constant motion of push and pull! They have their own agenda.

37. Because water molecules have POLARITY, they repel when they freeze & get too close.
show soda can, lil magnets
Discuss about students in a hallway

38. That’s why water EXPANDS when frozen while most matter contracts
show soda can…

39. Why does water FLOAT when frozen?
IT’S VOLUME INCREASES!!!
mass
volume
density =

40. These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!!
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form

41. Flowing water molecules are in a constant motion of push and pull
Flowing water molecules are in a constant motion of push and pull! They have their own agenda.
Like fans at a Bieber concert…

42. Polar water molecules don’t respond as quickly as other molecules to a little heat or cold.

43. These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!!
It DISSOLVES most stuff—UNIVERSAL SOLVENT
Its high specific heat helps MODERATE our Earth’s CLIMATE
Its SOLID form (ice) is LESS DENSE than its LIQUID form

44. Thurs…

45. What can “polar/magnetic” water molecules do?

46. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION

47. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION

48. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
WATER STICKS TO OTHER STUFF.
pencils, paper towels, clothes

49. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!

50. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
?????
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!

51. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
COHESION
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!

52. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
COHESION
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!
WATER MOLECULES STICK TO EACH OTHER.

53. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
COHESION
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!
WATER MOLECULES STICK TO EACH OTHER. Like people COoperating!

54. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
COHESION
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!
WATER MOLECULES STICK TO EACH OTHER Like people COoperating! SURFACE TENSION of WATER!
THANK YOU WATER MOLECULES FOR STICKING TOGETHER!!!

55. Let's illustrate
First with students then with cups….

56. Let's illustrate
Need volunteers…

57. Can you get a staple to “float” on water?

58. Can you get a staple to “float” on water?
Why did I put float in quotation marks?

59. Can you get a staple to “float” on water?
Why did I put float in quotation marks?
Why does the staple actually rest on top of water?

60. Can you get a staple to “float” on water?
Why did I put float in quotation marks?
Why does the staple actually rest on top of water?
SURFACE TENSION!! The water molecules stick together and form a “magnetic skin” on top of more water.

61. …Now for some pepper.

62. Give 2 reasons why pepper floats on water?

63. Give 2 reasons why does pepper float on water
Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water).

64. Let’s try to BREAK the polarity of water!

65. What happened when soap touched the surface of the water?
Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water).
What happened when soap touched the surface of the water?

66. Give 2 reasons why does pepper float on water
Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water).
What happened when soap touched the surface of the water? The soap repelled the pepper (pushed it away).

67. Give 2 reasons why does pepper float on water
Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water).
What happened when soap touched the surface of the water? The soap repelled the pepper (pushed it away).
Why?

68. Soap molecule….

69. Soap molecule….
Soap molecules mess up the way water molecules want to stick to each other.

70. Give 2 reasons why does pepper float on water
Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water).
What happened when soap touched the surface of the water? The soap repelled the pepper (pushed it away).
Why? Soap molecules mess up the way water molecules want to stick to each other.

71. WATER MOLECULES have POLARITY & act like tiny MAGNETS:
ADHESION
COHESION
WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!
WATER MOLECULES STICK TO OTHER WATER MOLECULES. COoperating! SURFACE TENSION of WATER!

72. end

73. old stuff follows…

74. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.

75. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
SOLID, LIQUID

76. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
GAS
SOLID, LIQUID

77. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
It’s NECESSARY for LIFE!

78. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
It’s NECESSARY for LIFE!

79. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
It’s NECESSARY for LIFE!

80. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
It’s NECESSARY for LIFE!
Its SOLID form (ice) is LESS DENSE than its LIQUID form.

81. Why is water is so special…
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
It’s NECESSARY for LIFE!
Its SOLID form (ice) is LESS DENSE than its LIQUID form.
aka…ICE FLOATS!

82. 3/4 can be explained ATOMICALLY
It DISSOLVES most stuff—UNIVERSAL SOLVENT
It occurs NATURALLY in ALL 3 STATES of matter.
It’s NECESSARY for LIFE!
Its SOLID form (ice) is LESS DENSE than its LIQUID form.