Air Pollution Research the air pollutants produced by...

Key Concepts

Stoichiometry in Combustion Reactions

Stoichiometry involves using balanced chemical equations to quantitatively analyze the reactants and products in a chemical reaction. In the context of combustion, stoichiometric calculations help determine the ratios of fuel and oxygen needed for complete combustion and allow for the quantification of pollutants formed when the reaction does not proceed ideally. This is essential for evaluating how changes in combustion conditions or fuel composition might impact pollutant outputs.

Emission Reduction Strategies and the Impact of Mass Transit

This concept explores how reducing the number of vehicles on roads—by encouraging mass transit usage—can lower overall emissions from internal combustion engines. By performing stoichiometric calculations, one can estimate how decreases in motor vehicle use can lead to proportional reductions in the production of pollutants. This approach emphasizes the importance of alternative transportation methods in mitigating air pollution and improving urban air quality over time.

Combustion Chemistry

This concept involves understanding the chemical reactions that occur when gasoline combusts in internal combustion engines. The process usually involves the reaction of hydrocarbons with oxygen to produce energy, carbon dioxide, and water, among other byproducts. Understanding combustion chemistry is crucial to identifying how different conditions (such as temperature and oxygen availability) can lead to complete or incomplete combustion, which in turn influences the types and amounts of pollutants produced.

Air Pollutants from Gasoline Combustion

When gasoline combusts, it produces a variety of air pollutants, including carbon monoxide (CO), carbon dioxide (CO2), nitrogen oxides (NOx), and unburned hydrocarbons. Each of these pollutants results from specific reaction pathways during combustion. For example, incomplete combustion can lead to the production of CO and unburnt hydrocarbons, while high-temperature conditions favor the formation of NOx through the reaction of nitrogen and oxygen in the air.

Transcript

00:01 All right, guys.

00:01 June, problem 11 of chapter 11 in chemistry matter and change.

00:07 So, research the air pollutants produced by combustion of gasoline and thermal combustion engines.

00:11 So you ask the common pollutants and the reaction that produces them.

00:14 So gasoline is a hydrocarbon.

00:16 So c, cx, h, h, h, y.

00:26 It's composed of carbon hydrant, the exact length of the, the exact length of the carbon chain that depends.

00:34 Some kind of fuel you're using.

00:37 You also have combustion as is also sometimes used in as combustion gas sometimes also contains nitrogen gas to make it somewhat less and somewhat inert.

00:58 So it doesn't you're not you're not using up your fuel as quickly.

01:09 Now when nitrogen, when you burn your fuel it's going to react.

01:13 With oxygen.

01:17 And this can produce few different things.

01:19 This can produce co2, which contributes to global warming, because as co2 is releasing the atmosphere, your create, co2 is releasing to the atmosphere, you'll expand and heat up the earth's atmosphere.

01:40 You also have carbon monoxide, co, which is very dangerous, like if carbon monoxide will prevent you from breathing properly.

01:50 You have water that comes off in the form of steam.

01:54 Water, incidentally is also green, water paper incidentally is also a greenhouse gas.

01:59 And then you have nitrogen dioxide.

02:10 Or rather, i should say, like just nitrogen oxides in general.

02:18 And nitrogen oxides are dangerous because if nitrogen oxide mix with sulfur dioxide, they can actually form acid, they can form acid rain.

02:30 And that is, well, as you can imagine, it's rain that's very acidic.

02:35 So that does a lot of damage, both people and people, the environment, architecture, et cetera.

02:42 Yes.

02:47 The co2 and co, those are formed from the oxygen reacting specifically with the carbon from your gasoline.

02:54 Co2 is from complete combustion.

02:57 Co is from more incomplete combustion.

03:02 So it's really just how your oxygen is interacting with your gasoline.

03:14 So incomplete combustion that can occur because you don't have a sufficient supply of oxygen...

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