Question

Which of the following reactions shows a chemical change producing a gas?

A. H₂(g) + O₂(g) → H₂O()
B. 2CH₃OH()+3O₂(g) → 2CO₂(g) + 4H₂O()
C. NaCl(s)→ NaCl(aq)
D. 2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
It’s B

Answer 1

Option B (2CH₃OH(g) + 3O₂(g) → 2CO₂(g) + 4H₂O(l)) shows a chemical change producing a gas.

Step-by-step explanation:

The correct reaction that shows a chemical change producing a gas is option B: 2CH₃OH (g) + 3O₂ (g) → 2CO₂ (g) + 4H₂O (l).

In this reaction, the combustion of methanol (CH₃OH) with oxygen (O₂) produces carbon dioxide (CO₂) and water (H₂O).

This is an example of a combustion reaction, where a hydrocarbon reacts with oxygen to produce carbon dioxide and water, along with the release of energy.