Please help me verify:

The following reactions are involved in the formation of acid rain. Use oxidation numbers to identify which of these reactions are REDOX reactions.

a. 2SO2(g) + O2(g) �� 2SO2(g)
-2 -2 0 -2 -2
No change - not REDOX reacton

b. 3NO2(g) + H2O(l) �� 2HNO3(aq) + NO(g)
-3 -2 +1 -2 +1-3-2 -3-2
Nitrogen and Oxygen are reduced
REDOX reaction has occured

c. SO2(g) + H2O(l) �� H2SO3(aq)
-2-2 +1-2 +1-2-2
Oxygen is reduced
REDOX reaction has occured

Please check...

ps. why would they make a rule for hydrogen in most compounds being +1 when is it not? Same with oxygen being -2.

  1. 👍 0
  2. 👎 0
  3. 👁 691
  1. You still are having trouble with oxidation numbers.
    a is not balanced. I think you meant to write
    2SO2 + O2 ==> 2SO3
    And that is a REDOX equation. S changes from +4 to +6; oxygen changes from zero (the O2 is zero while the O in SO2 is unchanged) to -2 in SO3.

    b. You are correct that this is a redox equation but not for the right reasons. N changes from +4 in NO2 on the left to +5 in HNO3 on the right and +2 in NO on the right. Therefore, N in NO2 on the left undergoes both oxidation and reduction. You note that oxygen changes but it doesn't. The oxidation number on the left (in H2O) is -2 and on the right it is -2 in HNO3 and -2 in NO.
    c. SO2(g) + H2O(l) �� H2SO3(aq)
    S in SO2 is +4 and in H2SO3 is 4. No change. O in SO2 is -2 and O in H2O is -2. ON the right, O in H2SO3 is -2. No change so this is not a redox equation.
    Re: your P.S. Because in MOST compounds, H is +1 and in MOST compounds O is -2. H is something other than +1 ONLY in the hydrides (LiH, NaH, KH, CaH2, etc where it is -1). O is other than -2 only in the peroxides (Na2O2, H2O2, K2O2, BaO2, etc where it is -1) AND in the superoxides (KO2, etc where it is -1/2).

    1. 👍 0
    2. 👎 0
  2. Hi yes sorry the arrows didn't work out when I copied the question.

    For the following in your answer

    2SO2 + O2 ==> 2SO3
    And that is a REDOX equation. S changes from +4 to +6; oxygen changes from zero (the O2 is zero while the O in SO2 is unchanged) to -2 in SO3.

    Why is S +4? Doesn't S gain 2 electrons hence -2?

    I'm using periodic table and S is in group 6A/16 . I thought 6A = 6

    This is corrispondence course so all I have done is based on book explanation and my research so I'm not entirely confident on my periodic table use, maybe that is why I'm getting this wrong.

    1. 👍 0
    2. 👎 0
  3. Hi again - was just comparing part c with your notes and I have an extra Oxygen on left side that right side doesn't have?? Perhaps your mistaken and oxygen is reduced?

    1. 👍 0
    2. 👎 0
  4. Please disregard my 2 comments after. I finally had my Eureka moment and figured this all out. Thanks to your help and researching a bit more I feel I understand this now. Your efforts in helping me were not wasted lol. Thanks again!

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    2. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 -> Cr2O7^2– *B.) Cr2O72– -> Cr2O3 C.) NH4+ -> N2 D.) N2 -> NH4+ 3. Which oxidation-reduction reactions

    asked by jack on March 22, 2013
  2. scince

    During a rain storm, rain comes straight down with velocity Vi =-15 m/s and hits the roof of a car perpendicularly. The mass of the rain per second that strikes the roof is 0.060 kg every second. Assuming that the rain comes to

    asked by trina on July 26, 2013
  3. Chemistry

    Classify the following reactions as precipitation reactions, oxidation-reduction reactions, or acid-base reactions. 1)2NaCl(aq)+K2H2Sb2O7(aq)==Na2H2SbO7(s)+2KCl(aq) 2)(CH3COO)2Cu(aq)+(NH4)2C2O4(aq)==CuC2O4(s)+2CH3COONH4(aq)

    asked by Katelyn on October 4, 2016
  4. chemistry

    In the reaction between CV+ and –OH, one species is acting as the Lewis base, the other as the Lewis acid. (Note: A Lewis acid is not necessarily a proton donor. It is, however, always an electron pair acceptor). Which reagent

    asked by Sara on July 13, 2010
  1. Chemistry

    How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid,

    asked by Erika on November 1, 2015
  2. Physical Science ?

    1. Cooking requires continuous addition of energy to the chemical reactions that are taking place. The chemical reactions involved in cooking can be described as _____. 2. Measuring how quickly a reactant disappears is one way to

    asked by raychel on November 8, 2017
  3. Science

    Calculate the acid concentration of a sample of acid rain with a pH of 4.20

    asked by Domenic on August 4, 2011
  4. Chem. Again

    28: You have a glass of pure water. Are chemical reactions occurring in the water? If so, what are they? If not, explain why not. 29: While investigating the effects of acid rain in your area, you discover a lake that is

    asked by Rachel on May 12, 2009
  1. chemistry 112

    the formation of SO3 from so2 and o2 is an intermediate step in the manufacture of sulfuric acid, and it is also responsible for the acid rain phenomenon. the equilibrium constant Kp for the reaction is 0.13 at 830 degree celcius.

    asked by sadia on February 19, 2014
  2. Chemistry

    Calculate the acid concentration of a sample of acid rain with a pH of 4.20

    asked by Domenic on August 4, 2011
  3. Science

    what is the word equation for the formation of acid rain?

    asked by Dee on October 9, 2008
  4. Chemistry

    Write the formation equation for the ester that forms between propanoic acid and 1-pentanol. Include the names of the products and the structures for all substances involved.

    asked by Lily on May 29, 2016

You can view more similar questions or ask a new question.