Multiple Choice
Which of the following statements about the reaction of one mole of methane (CH_4) with oxygen at standard temperature and pressure (STP) is NOT correct?
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7. Gases
Gas Stoichiometry
Multiple Choice
Chip bags are commonly filled with which gas to preserve freshness and prevent oxidation?
A
Nitrogen (N_2)
B
Helium (He)
C
Oxygen (O_2)
D
Carbon dioxide (CO_2)
Verified step by step guidance1
Understand the purpose of the gas inside chip bags: it is used to preserve freshness and prevent oxidation of the chips.
Recall that oxygen (O_2) promotes oxidation, which causes spoilage and staleness, so it is generally avoided inside chip bags.
Consider the properties of the gases listed: Helium (He) is inert but expensive and not commonly used for packaging food; Carbon dioxide (CO_2) can be used in some food packaging but may affect taste and texture.
Nitrogen (N_2) is an inert, non-reactive gas that displaces oxygen and moisture, helping to keep the chips fresh without reacting chemically with the food.
Conclude that nitrogen (N_2) is the most suitable gas commonly used in chip bags to preserve freshness and prevent oxidation.
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