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Author Question: Which of the following statements about He is false? a. It is an inert gas. b. It is odorless. ... (Read 23 times)

mydiamond

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on: Jul 16, 2018
Which of the following statements about He is false?
 
  a. It is an inert gas.
  b. It is odorless.
  c. It is nonflammable.
  d. It is heavier than air.

Question 2

Which of the following statements about CO2 are true? 1. It does not support animal life. 2. It is a flammable gas. 3. It is odorless and colorless. 4. It is heavier than air.
 
  a. 1 and 3 only
  b. 2 and 3 only
  c. 3 and 4 only
  d. 1, 3, and 4 only


Cnarkel

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: D
Helium is second only to hydrogen as the lightest of all gases; it has a density at STPD of 0.1785 g/L. Helium is odorless, tasteless, nonflammable, and chemically and physiologically inert.

Answer to Question 2

ANS: D
At STPD, CO2 is a colorless and odorless gas with a specific gravity of 1.52 (approximately 1.5 times heavier than air). Carbon dioxide does not support combustion or maintain animal life.


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