Author Question: In high concentrations, which of the following gases is a potent anesthetic? a. Nitric oxide c. ... (Read 78 times)

PhilipSeeMore · **on:** Jul 16, 2018

In high concentrations, which of the following gases is a potent anesthetic?

a. Nitric oxide c. Carbon dioxide
b. Nitrous oxide d. Helium-oxygen mixture

Question 2

Which of the following gases is the least dense?

a. Carbon dioxide c. Helium
b. Nitrous oxide d. Air

jsm54321 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
The major use for nitrous oxide is a central nervous system depressant. As such, it is a potent an-esthetic when administered in high concentrations. At very low concentrations (2 to 80 parts per million) combined with oxygen, nitric oxide has been used successfully to treat persistent pul-monary hypertension of the newborn. Carbon dioxide is nonflammable, but it supports combus-tion. Helium-oxygen mixtures decrease the work of breathing by decreasing turbulent airflow.

Answer to Question 2

ANS: C
Helium is the second-lightest element, with a density of 0.165 kg/m3 at 21.1 C and 1 atmos-pheric pressure (atm). Oxygen is slightly heavier than air, with a density of 1.326 kg/m3 at 21.1 C and 760 mm Hg.