Which of the letters points to the manufacturer's mark? a. A ...

[KWilfred]

Which of the letters points to the manufacturer's mark?
 
  a. A c. C
  b. B d. D

Question 2

At 183 C, which of the following gases exists as a pale, bluish liquid that is slightly heavier than water?
 
  a. Air c. Nitrous oxide
  b. Oxygen d. Carbon dioxide

[robbielu01]

Answer to Question 1

ANS: B

Answer to Question 2

ANS: B
Oxygen is an elemental gas that is colorless, odorless, and tasteless at normal temperatures and pressures. It makes up 20.9 of the Earth's atmosphere by volume and 23.2 by weight. It con-stitutes approximately 50 of the Earth's crust by weight. Oxygen is slightly heavier than air, having a density of 1.326kg/m3 at 21.1 C and 760 mm Hg (specific gravity = 1.105). At temper-atures less than 183 C (300 F), oxygen exists as a pale, bluish liquid that is slightly heavier than water.

[KWilfred]

Thanks for the timely response, appreciate it

[miss.ashley]

Excellent