Cost isn't everything. Consider the following pros and cons to using each option. Option Pros Cons No dangerous by-products Heat time of 3 minutes #1 Bulky Very environmentally friendly- products will react with CO2 (removing it from the atmosphere, lowering greenhouse gases) and make chalk and water Not able to heat well in cold weather #2 Heat time of 5 minutes Readily available Reactant can be unstable when heated #3 Produces hydrogen gas (flammable) in a heated, pressurized container. Your scientists have determined that this is an Uses much less material for same amount of #4 heat 90 second heat time explosion risk. 5. Santa cares about being green and saving the environment, and on the Polar Express, what Santa wants, he gets. Keeping in mind all of the pros and cons, the cost of each option, and the option you excluded in Question 1, which option do you think your company should go with? Explain your reasoning.
Even though Option 2 is the most environmental friendly, however since the heating time is 5 minutes, thus the heat efficiency is low and a large amount of the fuel provided in this option will be required to achieve the same temperature as the other methods. Moreover, it is not able to heat in cold weather.
Even though Option 3 is readily available but because the reactant is unstable, therefore it should be stored in a controlled environment where the temperature can be maintained below a certain degree so that any chance of the reactant becoming unstable is lessened. Moreover utmost care should be taken while handling and transportation of the reactant. Thus this makes the cost of the reactant high. On top of that, because it is unstable when heated, the heat efficiency will be far less than any other method.
Option 4 is a clean source and has the highest heat efficiency with the heating time of only 90 seconds. However because it produces hydrogen gas that is highly flammable, this method poses a fire hazard and is extremely dangerous.
Option 1 is a clean source of heat as there is no dangerous by product. Even though it is less environmental friendly than option 2, but this option is able to heat in all kinds of weather, making it useful for people living in any kind of climate. It has a moderate heat efficiency and the heat time is about 3 minutes, which is higher than that of option 2 but significantly lower than option 4, yet it is preferred over option 4 because option 4 is highly flammable and can cause fire hazards. The only con of this method is that this option is bulky and transportation cost will be high. However since it is stable, no additional storage and transportation facility is required which makes it cheaper than option 3.
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