1. 4.1 Technologies based on Solubility
Describe technologies based on the solubility of materials

2. How does soap get dirt off clothes?
Detergent  a substance that can remove dirt from fabric. All detergents contain a cleaning agent called a surfactant.

3. Phosphates were added to detergents to make them work better.
A surfactant is a particle that attaches itself to oil and dirt so that it can’t reattach to clothes.
Phosphates were added to detergents to make them work better.

4. Diving & Decompression The ‘Bends’
At greater water pressures, nitrogen gas dissolves in our blood and tissues at a much higher concentration than normal. If a diver ascends too quickly to the surface, the pressure decreases rapidly and bubbles of nitrogen gas form in parts of the body.

5. Solubility of Gases
The greater the pressure, the more gas is dissolved in a liquid.

6. As he rises, the nitrogen gas comes out of solution and forms bubbles in the blood. This painful condition can be fatal if not treated.
The deeper the diver goes, the greater the pressure, and the more nitrogen gas is dissolved in his blood.

7. Think of it like a can of pop

8. A hyperbaric chamber pressurizes the body, and nitrogen is forced to dissolve back into the blood, then the pressure slowly decreases back to normal allowing the gas to slowly leave the body.

9. Check and Reflect page 65 #’s 1-4
YOUR HOMEWORK . . .

10. Check and Reflect #1
Describe one new thing you learned about cleaners.
Detergents contain a cleaning agent called a surfactant that attaches itself to dirt and oil and prevents the dirt and oil from reattaching itself to clothes.

11. Check and Reflect #2 How does a detergent remove a stain?
A detergent removes a stain by surrounding the dirt particles after they have been agitated off the clothes. The detergent and dirt are then washed away together.

12. Check and Reflect #3 A) “Now brighter and whiter than ever”
Optical Brightener
B) “Cleans your washing machine as it cleans your clothes”
Corrosion Inhibitor
C) “Removes the toughest stains”
Bleach
D) “Now in new ocean mist scent”
Fragrance

13. Check and Reflect #4 What do divers need to know about solubility?
Divers need to know how a change in water depth affects the amount of nitrogen taken into the blood stream. By knowing this, they can determine how slowly they must rise to the surface to avoid getting the ‘bends’.