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Author Question: Why are combustion reactions generally exothermic? A) Hydrogen easily pulls electrons from the ... (Read 96 times)

dbose

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on: Jul 29, 2018
Why are combustion reactions generally exothermic?
 
  A) Hydrogen easily pulls electrons from the oxygen in water molecules and are reduced.
  B) During combustion oxygen is oxidized, which gives off lots of energy.
  C) Combustion involves the transfer of electrons to oxygen, which has an extremely high tendency for gaining electrons.
  D) It is highly exothermic because combustion involves an oxidation-reduction reaction between a metallic material and oxygen.

Question 2

What is happening at the anodic region?
 
  Rust has a tendency to form when iron in contact with water reacts according to the following reaction:
 
  4 Fe + 3 O2  2 Fe2O3
 
  A) Iron is being oxidized.
  B) Oxygen is being oxidized.
  C) Oxygen is being reduced.
  D) Iron is being reduced.
  E) none of the above


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briseldagonzales

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: C

Answer to Question 2

Answer: A


dbose

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Reply #2 on: Jul 29, 2018
Thanks


briseldagonzales

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Reply #3 on: Jul 29, 2018
Welcome :)


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