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
Lunna [17]
3 years ago
15

Balance the following redox equation, using half-reactions. Assume that the reaction occurs in an aqueous solution.

Chemistry
1 answer:
anastassius [24]3 years ago
5 0
First determine the formal oxidation numbers: 
N changes from +2 to +5 going from NO to (NO3)- O remains -2 the whole time Cr changes from +6 to +3 
Now write the half reactions, balance the oxygens with the required number of waters and then balance the hydrogens with the required number of protons: 
Oxidation half reaction: 
NO(aq) + 2 H2O(l) ---> (NO3)-(aq) + 4 H+(aq) + 3 e- 
Reduction half reaction: 
(Cr2O7)2-(aq) + 14 H+(aq) + 6 e- ---> 2 Cr3+(aq) + 7 H2O(l) 
Now balance the number of electrons on both sides and add them together: 
2 NO(aq) + 4 H2O(l) ---> 2 (NO3)-(aq) + 8 H+(aq) + 6 e- (Cr2O7)2-(aq) + 14 H+(aq) + 6 e- ---> 2 Cr3+(aq) + 7 H2O(l) --------------------------------------... 2 NO(aq) + (Cr2O7)2-(aq) + 6 H+(aq) ---> 2 (NO3)-(aq) + 2 Cr3+(aq) + 3 H2O(l) 
Notice that the charge is the same in both sides, which is an indication that the redox equation has been balanced correctly: 
-2 + 6 = -2 + 2(+3) +4 = +4 
You might be interested in
What happens to temperature when there is a State of Change
son4ous [18]

Answer:

Hello There!!

Explanation:

The temperature stays the same when a solid is melting or a liquid is boiling (changing state) during a change of state, even though heat energy is being absorbed.

hope this helps,have a great day!!

~Pinky~

4 0
3 years ago
Read 2 more answers
When a piece of sodium metal is kept in water in chemical equation​
jekas [21]

Explanation:

Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. 

7 0
3 years ago
Read 2 more answers
The compound before the arrow are called blank and the compound after the arrow are called blank
Norma-Jean [14]
First one is reactants and then second one is products
8 0
3 years ago
Question 2(Multiple Choice Worth 3 points) What happens to the rate of most reactions as the reaction progresses? The rate remai
Sav [38]

Answer: -

The rate decreases as the concentration of the reactants decreases

Explanation: -

A reaction involves change of the reactants into products.

Initially there is only reactants. So the rate if reaction is high.

After some time there are products. So the amount of reactant is less.

Reactions involve collisions of reactant molecules. As the reactant amount decreases, collisions between the reactants decreases. As such the rate of reaction decreases with the progress of the reaction.

3 0
3 years ago
Compare the density of the ocean crust and the continental crust. If they were to collide, predict which one would push under th
uysha [10]

Answer:

The difference between the density of the ocean crust and the continental crust is the fact that the ocean crust is denser than the continental crust. Meaning, the continental crust is likely to push over the oceanic crust considering it has less dense.

Explanation:

I hope this helps, the last time I learned this was in 5th grade and I am i currently in the 11th grade....

5 0
3 years ago
Other questions:
  • Naturally occurring zirconium exists are five isotopes. axe with a mass of 89.905 u(51.45%); Zr with a mass of 90.906 u (11.22%)
    5·1 answer
  • Which of the following is not a renewable resource 1. gold 2. salmon 3. mahogany 4. fresh water
    14·1 answer
  • Is it true that you get density by dividing mass by volume? And which one in the picture is denser?
    9·1 answer
  • PLEASE HELP!! 73 POINTS!!
    13·1 answer
  • Is Dry Ice a pure substance or a Mixture ?
    8·1 answer
  • What are the two main phases of cell division
    7·1 answer
  • The elements on the Periodic Table of the Elements are arranged in order of increasing
    12·2 answers
  • HELPPPPP WILL MARK BRAINLIEST
    6·2 answers
  • Help Pls pls I will give brainlist
    13·2 answers
  • An element consists of 1.40% of an isotope
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!