Multiple Choice
Which of the following best explains how fizzing (gas evolution) occurs during a chemical reaction?
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6. Chemical Quantities & Aqueous Reactions
Gas Evolution Equations
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Which gas is primarily responsible for the 'fizz' observed in soda when it is opened?
A
Nitrogen (N_2)
B
Oxygen (O_2)
C
Carbon dioxide (CO_2)
D
Hydrogen (H_2)
Verified step by step guidance1
Understand that the 'fizz' in soda is caused by the release of a dissolved gas when the bottle or can is opened.
Recall that carbon dioxide (CO_2) is commonly dissolved in sodas under pressure to create carbonation.
When the container is opened, the pressure above the liquid decreases, causing the dissolved CO_2 to come out of solution and form bubbles.
These bubbles of CO_2 gas rising to the surface create the characteristic 'fizz' sound and sensation.
Therefore, the gas primarily responsible for the fizz in soda is carbon dioxide (CO_2), not nitrogen (N_2), oxygen (O_2), or hydrogen (H_2).
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