Author Question: Which of the following statements regarding O2 are true? 1. It is only slightly soluble in water. 2. ... (Read 54 times)

Alainaaa8 · **on:** Jul 16, 2018

Which of the following statements regarding O2 are true? 1. It is only slightly soluble in water. 2. It is odorless and transparent. 3. It is flammable. 4. It is heavier than air.

a. 1 and 3 only
b. 1, 2, and 4 only
c. 3 and 4 only
d. 1, 2, 3 only

Question 2

What factors affect the combustion-supporting properties of O2? 1. Concentration 2. Partial pressure 3. Humidity

a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3

missalyssa26 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
Oxygen is a colorless, odorless, transparent, and tasteless gas. It exists naturally as free molecular O2 and as a component of a host of chemical compounds. Oxygen constitutes almost 50 by weight of the earth's crust and occurs in all living matter in combination with hydrogen as water. At standard temperature, pressure, and dry (STPD), O2 has a density of 1.429 g/L, being slightly heavier than air (1.29 g/L). Oxygen is not very soluble in water.

Answer to Question 2

ANS: C
Oxygen is nonflammable, but it greatly accelerates combustion. Burning speed increases with ei-ther (1) an increase in O2 percentage at a fixed total pressure or (2) an increase in total pressure of O2 at a constant gas concentration. Thus, both O2 concentration and partial pressure influence the rate of burning.