Multiple Choice
Which of the following equations correctly expresses the self-ionization of water?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following gases will ignite at the lowest concentration in air?
A
Propane (C_3H_8)
B
Carbon monoxide (CO)
C
Methane (CH_4)
D
Hydrogen (H_2)
Verified step by step guidance1
Understand that the question is about the flammability limits of gases, specifically the Lower Explosive Limit (LEL), which is the lowest concentration of a gas in air that can ignite.
Recall that each gas has a characteristic LEL, usually expressed as a percentage by volume in air, indicating the minimum concentration needed for combustion.
Compare the typical LEL values for the given gases: Propane (C\_3H\_8), Carbon monoxide (CO), Methane (CH\_4), and Hydrogen (H\_2).
Note that Hydrogen has a very low LEL compared to the other gases, meaning it can ignite at much lower concentrations in air.
Conclude that because Hydrogen's LEL is the lowest, it will ignite at the lowest concentration in air among the gases listed.
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