Example H.1

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Example H.1

Postby Annamarie » Sun Jun 30, 2019 9:49 pm

Understandably, in order to balance the equation, we will need oxygen - but where is it signified in the question ( aside from letting you know its a gaseous combination ) to hint at adding the oxygen molecule in the reactants? If this is obvious to some, where can I read up to understand how to do this?

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Re: Example H.1

Postby Chem_Mod » Sun Jun 30, 2019 10:46 pm

If you are referring to the example about the hexane fuel, the question provides you with the information needed to know the rest of the reactants and products by saying that the reaction is a combustion reaction. This means that along with the given substance, in this case hexane, reacts with oxygen gas to produce water and carbon dioxide.

Brooke Yasuda 2J
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Re: Example H.1

Postby Brooke Yasuda 2J » Tue Oct 01, 2019 12:33 am

Also, when balancing equations with Oxygen in the problem, Oxygen does not appear as simply one Oxygen because it is a diatomic molecule. This means that Oxygen forms molecules of two atoms bonded together to make O2. Therefore, if there is Oxygen involved in the reaction like in the combustion of hexane, you know that it is O2.

Kayli Choy 2F
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Re: Example H.1

Postby Kayli Choy 2F » Tue Oct 01, 2019 10:39 am

Additionally, whenever the problem states that the reaction is a combustion, burning, or complete oxidation, you know that O2 (g) will be one of the reactants, and that this reaction will release CO2 and H2O. These types of reactions all release energy. If there is incomplete oxidation, CO (carbon monoxide) will be one of the products instead of CO2.

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Re: Example H.1

Postby Veronica_Lubera_2A » Tue Oct 01, 2019 11:20 am

Therefore, each combustion reaction will have this skeletal structure:

Molecule/Compound + O2 --> CO2 + H20

Remember to also always balance the equation!
One tip that helps me to remember a combustion reaction is our breathing. We take in O2 from the air to survive and when we breathe out, we release CO2 and water vapor.

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