In theory, flame retardants in furniture and other household items such as draperies could reduce the spread of flames and thus protect people during fires. However, the major category of chemical flame retardants used for this purpose, the polybrominated diphenyl ethers (PBDEs), has a number of adverse health effects including those on the thyroid gland. If you had to choose between a flame-retardant sofa set (with PBDE) and PBDE-free non-flame-retardant sofa set, which would you choose? What alternatives are available? Explain the benefits of these alternatives.

2.) It’s a bad day in the lab!  Two students are doing experiments.  Each is 20 feet away from the professor.  At the same time, each of them lets the same amount of a smelly gas into the room.  One of them releases ammonia, NH3, and the other releases SO2.  NH3 has a pungent odor, and SO2 smells like rotten eggs.  The professor has no idea that this has happened, until she smell the first gas.  Which chemical will the professor smell first?   (NH3 or SO2)                                .  If the professor starts to smell the first gas 42. seconds after the gas is released, how long will it take her to smell the second gas?       sec. * Note: It is unsafe practice to work with these chemicals in an open lab.

Write down some of the benefits and drawbacks of going green. (This question is related to green chemistry in industry) Benefits: Drawkbacks:

A typical long-haul diesel truck travels an average of 72,000 miles annually. Diesel-powered trucks are though to be a major contributor of particulate matter less than 2.5 μm (PM) and nitrogen oxides (NOx) emissions from mobile sources. Assume the average long-haul diesel truck emits 8.67 g/mile of NOx. The annual emission rate (kg/yr) for NOx is most nearly: 15.2 O 625 O 64,0 O 1.57

Calculate the mass of the greenhouse gas, carbon dioxide (CO2) that you release into the atmosphere with each tank of petrol you consume in your car. assume the petrol you put into your car is pure octance (c8H18). The density of octance is 702 kg/m^3 (or 0.702g/ml). Assume a tank of gas is 60 litres

What is fire? What are the classifications of fire? Make a table of the type of fire versus the type of fire extinguishing methods and fire extinguishers to be used.

Explain how ozone in the upper atmosphere functions to filter short-wavelength solar radiation, and how chlorofluorocarbons (CFCs) cause depletion of the ozone layer?

ecollege.com/course.html?courseld=16985674&OpenVellumHMAC=d4abff74a80d41d197d6c57220120253#10001 EUsing Microwave Radiation to Heat Coffee 9 of 29 M Review | Constants | Periodịc Table Microwave ovens use microwaye radiation to heat food. The microwaves are absorbed by the water molecules in the food, which is transferred to other components of the food. As the water becomes hotter, so does the food. Part A Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 295 mL of coffee from 25.0 °C to 62.0 °C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 J/(g - K), as water over this temperature range. Express the number of photons numerically. > View Available Hint(s) ? photons Submit Provide Feedback Next> P Pearson 11:26 AM 72°F Sunny 11/25/2021 20 Cop

It is often said that water vapour amplifies the Earth’s greenhouse effect. Indicate one way that an increased atmospheric concentration water vapour can increase the greenhouse effect and one way that it can decrease the greenhouse effect.

Is molecules A and B identical? Is molecules C and D identical? What structural feature accounts for the difference in your answers to 1a and 1b? What difference did this structural feature impart on your models?