Of the Reactions Involved in the Photodecomposition of Ozone (Shown

question 84

Multiple Choice

Of the reactions involved in the photodecomposition of ozone (shown below) , which are exothermic?
1) O₂ (g) + hv → O (g) + O (g)
2) O (g) + O₂ (g) + M (g) → O₃(g) + M^* (g)
3) O₃ (g) + hv →O₂ (g) + O (g)
4) O (g) + O (g) + M (g) →O₂ (g) + M^* (g)

• A) 2 only
• B) 1, 2, and 4
• C) 1 and 3
• D) 2 and 4
• E) all of them

---

Definitions:

Third Variable

A factor that is not directly involved in a research hypothesis but may influence the relationship between the variables being studied.

Correlational Study

A research method that examines the relationship between two or more variables to determine if a correlation exists, without implying causation.

Statistical Significance

Likelihood that a study’s results have occurred only by chance.

Probability

The likelihood or chance that a specific event will occur, often expressed as a ratio or percentage.