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Author Question: A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of ... (Read 122 times)

Garrulous

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on: Jul 28, 2018
A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of air is ______________.
 Fill in the blank(s) with correct word

Question 2

About 75 of the mass of the visible universe is composed of which element?
 a. Helium
  b. Iron
  c. Hydrogen
  d. Silicon


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yifu223

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Reply #1 on: Jul 28, 2018
Answer to Question 1

nitrogen oxides

Answer to Question 2

c


Garrulous

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Reply 2 on: Jul 28, 2018
:D TYSM

kjohnson

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Reply 3 on: Yesterday
Excellent

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