10. CBQ - Randicity of foods

Question:

5 m.

Give answer to the following questions:

Kalpana says:

“Chips packed in nitrogen do not become rancid because nitrogen prevents the fats from reacting chemically with anything.”

Jiya says:

“Nitrogen-filled packaging reduces rancidity mainly because it reduces the availability of oxygen required for oxidation.”

1. If oxygen were introduced into the nitrogen-filled packet, what would most likely happen over time?

Nitrogen would immediately remove all oxygen
The possibility of oxidation would increase
The food would become completely resistant to rancidity
The fats would stop undergoing chemical reactions

2. Why did the chips in the sealed packet not spoil quickly?

Nitrogen gas prevents contact of oxygen with the chips, speeding the oxidation
Nitrogen gas prevents contact of oxygen with the chips, slowing down oxidation
Hydrogen gas prevents contact of oxygen with the chips, slowing down oxidation
Oxygen gas prevents contact of oxygen with the chips, slowing down oxidation

3. Why is the second student's explanation more appropriate?

Nitrogen is an inert gas that enhances rancidity
Nitrogen converts rancid fats back into fresh fats
Nitrogen is a strong antioxidant that destroys all oxidised fats
Nitrogen is comparatively unreactive and replaces oxygen in the package

4. A student concludes, “Nitrogen completely stops oxidation, whereas sealing only slows it down.” Which evaluation is most appropriate?

The conclusion is incorrect because sealing provides no protection against rancidity
The conclusion is partly supported because nitrogen flushing greatly reduces oxygen exposure, but oxidation does not becomes absolutely zero
The conclusion is completely correct because nitrogen never reacts with any substance
The conclusion is incorrect because nitrogen accelerates oxidation of fats

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