alleryStart learning →Small pieces of iron and of sodium are left exposed to air overnight. What is observed the next morning?
ABoth metals react completely overnight
BIron reacts fully while sodium does not
CNeither metal shows any visible change
DSodium reacts fully while iron barely does
Answer & Solution
Correct answer: D. Sodium reacts fully while iron barely does
1. Both metals sit in the same air at the same temperature and in similar sized pieces.
2. The only variable left is the chemical nature of the metal itself.
3. Sodium reacts completely with air overnight while iron is barely touched.
4. So the identity of the reacting substance alone sets the difference in rate.
5. The reversed option swaps the two metals, which is the common misreading.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.2 Factors Affecting Reaction Rates_
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