1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elden [556K]
3 years ago
7

Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reduci

ng agent. Show all of the work used to solve the problem. Br- + MnO2 yields Br2 + Mn2+
Chemistry
1 answer:
earnstyle [38]3 years ago
6 0

The charge of Br changed from –1 to 0, therefore it is the element which is oxidized. Since it is oxidized then Br is also the reducing agent.

 

The charge of Mn changed from +4 to +2 therefore it is the element which is reduced. Since Mn is reduced, then MnO2 is the oxidizing agent.

 

The half –reactions are:

Br: 2Br --> Br2 + 2e-

Mn: MnO2 --> Mn2+

First balance oxygen by adding H2O:

MnO2 --> Mn2+ + 2H2O

Then balance hydrogen by adding H+ ions:

4H+ + MnO2 --> Mn2 + 2H2O

Then the appropriate electrons:

4e- + 4H+ + MnO2 --> Mn2 + 2H2O

 

Multiply the half-reaction of Br by 2 because the half-reaction of Mn has 4 electrons.

4Br --> 2Br2 + 4e-

 

Combine the two half reactions and cancel common factors:

4Br-  +  4H+  +  MnO2 --> 2Br2  +  Mn2  +  2H2O

You might be interested in
2. Suppose this was done on top of a balance. Do you think the mass would change as the reaction proceeded?
Viefleur [7K]
Yes because gas is produced
8 0
3 years ago
Stoichiometry is best defined as the
Oxana [17]

Stoichiometry is “quantitative relationship” among the “reactants” and the “products” in a “chemical reaction”.

<u>Explanation</u>:  

In stoichiometry “stoicheion” means element and “metron” means measure in Greek. The stoichiometric calculation depends upon “stoichiometric coefficients” in a “chemical equation” which can be explained as the “number of moles” of each substance (reactants or products). Stoichiometric calculation is done as follows:

For example reaction between nitrogen and hydrogen to form ammonia as

\mathrm{N}_{2}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{g})

Here stoichiometric coefficients show that “one molecule of nitrogen” reacts with “three molecules of hydrogen” to form “two molecules of ammonia”. Multiplying Avogadro number 6.022 \times 10^{23} to no of molecules in equation:

\text { For } \mathrm{N}_{2}: 1 \times 6.022 \times 10^{23}=1 \mathrm{mol}

\text { For } 3 \mathrm{H}_{2}: 3 \times 6.022 \times 10^{23}=3 \mathrm{mol}

\text { For } 2 \mathrm{NH}_{3}: 2 \times 6.022 \times 10^{23}=2 \mathrm{mol}

Taking molar masses into consideration:  

\text { For } \mathrm{N}_{2}: 1 \times 28.0=28.0 \mathrm{gm}

\text { For } 3 \mathrm{H}_{2}: 3 \times 2=6.0 \mathrm{gm}

\text { For } 2 \mathrm{NH}_{3}: 2 \times 17=34 \mathrm{gm}

Hence balanced equation gives stoichiometric coefficients which gives proportion by moles.

8 0
3 years ago
2. Which of the following solution contains more salt?<br> A. 3M<br> B. 1M<br> C. 0.5M<br> D. 0.25M
Tanya [424]

Answer: 0.25M

Explanation: Because of the highest concentration of water and, if they are all the same volume, the greatest amount of water assuming it is a solid solute in a water solution.

5 0
3 years ago
Why is BrCl5 nonpolar when it's Asymmetrical? Aren't symmetrical molecules suppposed to be polar?
Svet_ta [14]
Although there exists a dipole moment in the molecule, I guess its nonpolar because the dipole is very small as the electronegativity difference between the Br and Cl is very low and so it can be neglected.
8 0
4 years ago
Read 2 more answers
Label the liquids from least to most dense, Vegetable oil, water, Dish soap, Corn syrup, Honey
masya89 [10]

Answer:

1. Vegetable oil

2. Water

3. Dish soap

4. Corn syrup

5. Honey

8 0
3 years ago
Other questions:
  • Why is only one diastereomer formed in this reaction? Relate your answer to the mechanism you drew. b) If you used cis-stilbene
    10·1 answer
  • The pH of a 1.0M solution of butanoic acid HC4H7O2 is measured to be 2.41. Calculate the acid dissociation constant Ka of butano
    8·1 answer
  • In a closed system, how will a decrease in pressure affect the following reaction: N2O4(g) ⇌ 2NO2(g)?
    10·1 answer
  • Though Neon is a relatively small atom with a relatively high nuclear charge, it is difficult to add an electron to a neon atom.
    6·1 answer
  • A liquid at room temperature with high vapor pressure has:
    14·1 answer
  • The electrons in an atoms outermost orbitals, the electrons, are represented in a(n) , which consists of the elements symbol, re
    8·1 answer
  • Convert the speed of light, 3.0 × 10^8 m/sec, into mi/hr
    6·1 answer
  • name some examples of chemical solutions and maybe give a clear explanation as to what chemical solutions are ​
    8·1 answer
  • Which method would be BEST for separating a mixture of black pepper and water? * 1 point A. Condensation B. Sieving C. Filtratio
    9·1 answer
  • For the following reaction, 41.0 grams of sulfuric acid are allowed to react with 36.5 grams of zinc hydroxide. What is the maxi
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!