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Author Question: The earth's atmosphere contains ________; ________. A) 78 nitrogen; 21 oxygen B) 78 hydrogen; 21 ... (Read 142 times)

shenderson6

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on: Jun 23, 2018
The earth's atmosphere contains ________; ________.
 
  A) 78 nitrogen; 21 oxygen B) 78 hydrogen; 21 oxygen
  C) 21 nitrogen; 78 oxygen D) 21 inert gases; 78 oxygen

Question 2

Which statement is true about hydrocarbons?
 
  A) Unburned fuel can be classified as hydrocarbons
  B) They contribute to the formation of smog
  C) Both A and B
  D) Neither A nor B


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Kedrick2014

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Reply #1 on: Jun 23, 2018
Answer to Question 1

A

Answer to Question 2

C


shenderson6

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Reply 2 on: Jun 23, 2018
Thanks for the timely response, appreciate it

xiaomengxian

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Reply 3 on: Yesterday
Excellent

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