Question

Hydrogens (H₂) and oxygen gas (O₂) combine. Which change occurs that indicates a release of bond energy?O a strong odorO the appearance of color in the gasesO a loud popping noiseO the formation of CO₂ bubbles

Answer 1

A loud popping noise. Option C is correct

Explanations:

The reaction between hydrogen and oxygen is as given below;

`2H_2+O_2\rightarrow2H_2O`

This reaction shows that hydrogen undergoes combustion (burning of hydrogen). This reaction cause an explosion of hydrogen which leads to a pop sound that hydrogen make during the reaction.

Hence the change that indicates a release of bond energy during the reaction is a loud popping noise.