The Brown Color Associated with Photochemical Smog Is Due to NO₂(g),which

question 68

Multiple Choice

The brown color associated with photochemical smog is due to NO₂(g) ,which is involved in an equilibrium with N₂O₄(g) in the atmosphere. 2 NO₂(g) ⇌ N₂O₄(g)
Predict the signs of the enthalpy and entropy change for the forward reaction.

• A)The enthalpy change is negative and the entropy change is negative.
• B)The enthalpy change is negative and the entropy change is positive.
• C)The enthalpy change is positive and the entropy change is negative.
• D)The enthalpy change is positive and the entropy change is positive.

---

Definitions:

Ileocecal Valve

A valve located between the ileum (last portion of the small intestine) and the cecum (first part of the large intestine) that controls the flow of digested food.

Pyloric Sphincter

A muscular valve regulating the flow of food from the stomach to the duodenum of the small intestine.

Anal Sphincter

A circular muscle that surrounds the anus, controlling the passage of feces out of the body through the anal opening.

Salivary Glands

Glands located in the mouth that produce saliva, aiding in digestion and keeping the mouth moist.