2. Chemistry of Firefighting/Composites Sydney Holba, Thao Nguyen, and John Brown Period: E

3. Chemistry of Firefighting  Class A: A class A fire usually involves solid fuel with trash, wood, or paper. Water is usually used to extinguish the fire.  Class B: A class B fire usually involves flammable liquids such as gas, petroleum oil, paint. Water usually spreads the fire, because of the salt dissolved in most pressurized water fire extinguishers. The water will conduct electricity.  Class C: A class C fire is an energized electrical circuit fire such as a car. Also for this type of fire, water fire extinguishers are not used to put out the fire because the water conducts electricity.  Class D: A class D fire is a combustible metal fire. Magnesium and titanium are the most common types of metal fires. Water can be a source of oxygen for the fire, so only use a dry powder extinguishing agent, such as smothering and heat absorption.

4. - Combustion Reaction- an element or a compound reacts with oxygen, often producing energy in the form of heat and light.  Types of Extinguishers: -Water/Foam- removes heat elements and separates oxygen (Class A) - Carbon Dioxide- removes heat and oxygen (Class B and C) - Dry Chemicals- Interrupts the chemical reaction of fire (Class A, B, and C)

5. Interactive Question Class A Class B Class D Class C Classify each fire!

6. Composites  A composite is a type of material made from two or more items with different physical and chemical properties that when combined, produce another material with different characteristics from the original components. A composite can be made by embedding fibers in a plastic base.  What are Composites used for? -Aircraft - Boats/ Marine - Sporting Equipment(Tennis Rackets, Surf boards, Hockey Sticks)

7. Which of these is made from composites? A. Toothpaste B. Water Pipes C. Soap D. Mr. Sweeten E. Clouds

8. Benefits/Properties of Composites Includes lightweight properties: - Transportation- Less Weight: More fuel Savings and improved acceleration Non- Corrosive Low Maintenance Long Life Strong in material, low in density

9. For more information on composites, click the link below https://www.youtube.com/watch?v=WYqCnEvTRUQ

10. Which of these is NOT a benefit or property of a composite? A. Corrosive B. Flexibility C. Long- life span D. Low maintenance E. None of the above

11. Homework Questions o Chemistry of Firefighting: 1a. What would start each class of fire? b. How would you extinguish these fires? o Composites: 1a. What are some daily life products that you use that are made from composites? List 2. b. What are the advantages of using these products?