Hazard Class 2: Methyl Chloride - Coursework Example

Multiple choice questions may have more than one correct answer. Indicate all that apply Methyl chloride is hazard 2 dichloromethane is6.1, and 1,1-dichloroethane is 3. Explain these assignments in terms of structure and physical properties. (That is, what happens to chemical and physical properties as carbons and halogens are added). Ans: In hazard class 2 division 2.1, we have the material that has a boiling point of 20º C at sea level and is ignitable when in a mixture of 13 percent or less by volume with air. Now methyl chloride CH3Cl, and it has a boiling point on near about 20 C at sea level and ignitable (extremely flammable) due to which this is in this class. In hazard class 6 division 6.1, we have the Poisonous or Toxic Materials. Dichloromethane CH2Cl2 is not a stable compound due to which it becomes a poisonous and toxic. As the following reactions shows the formation of acid and highly toxic compounds. CH4 + Cl2 → CH3Cl (Methyl chloride) + HCl CH3Cl + Cl2 → CH2Cl2 (Dichloromethane) + HCl CH2Cl2 + Cl2 → CHCl3 + HCl CHCl3 + Cl2 → CCl4 + HCl In hazard class 3 we have Flammable and Combustible Liquids Where Flammable liquids are: A liquid having a flash point of ≤ 60.5º C (141º F) Any material in a liquid phase with a flash point ≤ 37.8º C (100º F) that is intentionally heated and offered for transport or transported at or above its flash point in bulk packaging. and Combustible liquids are a liquid that does not meet the definition of any other hazard class and has a flash point of > 60.5º C (141º F) and ≤ 93º C (200º F). Now 1,1-dichloroethane C2H4Cl2, is a liquid In the atmosphere, 1,1-dichloroethane decomposes with half-life of 62 days, chiefly by reaction of photolytically produced hydroxyl radicals. The liquid is highly flammable and combustible due to which this is included in this class. 2. Write a reaction between potassium phosphide and water. Explain why potassium phosphide is in Division 4.3. How would you fight a fire involving potassium phosphide? How far should you evacuate people in the case of a small spill? Ans: K3P + 3 H2O = 3 KOH + PH3 In division 4.3 we have the materials which are dangerous, when in contact with water, and liable to become spontaneously flammable or to give off flammable or toxic gas at a rate of > 1L/kg of material/hr. When potassium phosphide is exposed to water it can react violently and start a fire. This is why we have placed potassium phosphide in division 4.3. If potassium phosphide is on fire or involved in fire: Do not use water. Use dry chemical or carbon dioxide. In the case of small spill first isolate in all directions for 60 m and then persons downwind during day upto 0.4km and 1.7 km at night. 3. Identify the one chemical in each of the following that is in the appropriate DOT hazard class. a) Hazard class 8: butyl acetate, butanoic acid, butyl alcohol b) Hazard class 3: toluene diisocyanate, PCBs, ethanol c) Hazard class 5.2: ethyl ether, phenol, diacetyl peroxide 4. A BLEVE can be defined as “a sudden release of a large mass of pressurized superheated liquid to the atmosphere.” (Centre for Chemical Process Safety) a) Explain what the term “superheated” means here. b) How does a catastrophic failure of the containment vessel initiate a BLEVE rather than just a release of gas? 5. The following can be used to determine the type of hazard you might encounter in a hazardous materials incident. Describe the type of information you can obtain from each. a) UN number b) Hazard class placard c) MSDS d) NFPA diamond 6. You are an emergency responder called to a traffic accident at night where a truck has overturned. The placard on the truck is labeled 2495. You have access to the web through a wireless connection so you can get an MSDS, DOT Emergency Response Guide, or any other information you need. The contents of the truck are observed to be leaking and diesel fuel from the truck has been spilled. a) What is the material and what is the major threat that this situation represents? b) Describe the potential fire hazards associated with this situation. Should you spray down the truck with water? c) What would happen if some of this material came into contact with your skin or you inhaled it? d) What type of PPE should you have before you approach the truck? e) How big should the perimeter be? 7. Which of the following statements is true? a) The reportable quantity for acetonitrile is 100 lbs. b) PG II is specified for methanol. c) Trichlorosilane (commonly used in wafer fab operations) is water reactive. d) Phenol should be labeled as a corrosive. e) Cupric chloride is considered a marine pollutant 8. Classify the following according to NFPA as a flammable gas, flammable liquid (IA, IB, or IC), or combustible liquid (II, IIIA or IIIB). a) Triethylamine b) Aniline c) Ammonia 9. Draw the structure of the addition polymer that results from polymerization of 2-chloropropene. CH3 CH3 CH3 ---CH2-C-CH2-CH2-C-CH2-CH2-C-CH2--- Cl Cl Cl 10. Recycling of PET soft drink bottles involves heating with methanol and an acid catalyst to liberate ethylene glycol and dimethylterphthalate (methyl ester of pthalic acid). These can then be used as monomers to make new PET products. Write an equation for this recycling reaction. Ans: 11. Which of the following would you expect to be flammable? Which would be corrosive? Which would be an oxidizer? a) CFC 113 b) HNO3 c) 2-butanone d) Potassium chlorate e) Magnesium chloride 12. Write a balanced chemical equation for the complete combustion of toluene (C7H8). Calculate the heat released when one gram of toluene burned. How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned? Ans: Blanced chemical equation is C6H5CH3 + 9O2 7CO2 + 4H2O By burning of 1 gram of toluene we get 10.14 K cal. And when one gallon of toluene is burned the produce amount of CO2 is 26.5 litre. 13. Name the following a) Ans: No stable organic compound does exist with this formula. It should be instead which is 2-amino propane. b) Ans: p-amino benzoic acid c) Ans: Ethylidene 14. Draw the correct structure for the following: a) 2-pentanone b) butyraldehyde c) p-cresol 15. Give the correct formula for the following: a) Iron (III) sulfide b) Ammonium phosphate c) Calcium carbonate d) Ferric chloride 16. For each of the following functional groups (a – h) determine if there is a compound (i – ix) that matches that functional group. If there is no compound match, say so. a) amide b) amine c) ketone d) aldehyde e) alcohol f) freon g) alkyne h) phenol (i) h) phenol (ii) b)amine (iii) a)amide (iv) There is no match (v) There is no match (vi) e) alcohol (vii) d)aldeyde (viii) There is no match (ix) f) freone 17. What property of acetylene makes it less stable than other hydrocarbons? How does that affect the way you have to store acetylene? What is the OSHA standard specific to acetylene? 18. Which of the following statements is true? a) Ammonia leaks will tend to hug the ground. b) Aluminum is a transition metal. c) N has a higher electronegativity than Ge d) A flash point of 50 oC is rated by DOT as a combustible liquid. e) Ammonia can be liquefied at 25 oC by applying pressure without cooling. f) You should be concerned about a fire with a tanker truck placarded as 1202 is involved in an accident. g) A truck carrying gypsum does not need to be placarded. h) A truck carrying gasoline must always be placarded. i) You should be concerned about HCN in a fire involving PET (poly ethylene terephthalate). j) You should be concerned about SO2 in a fire involving wool. k) You should be concerned about NO2 in a fire involving polyurethanes. l) 10 mm Hg is a larger pressure than 10 Pa. m) It takes more energy to vaporize 1 liter of water at 100 oC than to heat it from 25 oC to 100 oC. n) The NFPA diamond rating for fire for methanol is a 3. o) The NFPA diamond rating for diethyl ether should have a W. p) If a commercial product mixture contained 0.5% of xylene, the MSDS for the product must contain xylene as a component. q) A liquid with a flash point of 50 oC is rated by DOT as a combustible liquid. r) It is permissible to ship a small tank of chlorine (< 1 kg) on a passenger aircraft. s) You should be concerned about SO2 in a fire involving polyurethanes. 19. The molecular weight (grams/mole) of sodium dihydrogen phosphate is: 20. A carrier has to deliver 500 lbs of acetonitrile in 10 cans. What is the complete description of the material on the shipping papers? Is a placard required? What does the DOT label tell you about the hazards of acetonitrile? Fire Fighting Procedures: If material on fire or involved in fire: Do not use water. Use dry chemical or carbon dioxide. have completed questions #3, 4, 5, 6, 7, 8, 17, 18, 19 and 20 All that is left is questions #1, 2, 9, 10 11, 12, 13, 14, 15 and 16 8, 12, 13, 14, 15, and 16 + ch30h C6H5CH3 + 9O2 -> 7CO2 + 4H2O (toluene) The heat of combustion of toluene is 934.2 kcal per mole Read More