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Mn2O7

Manganese Heptoxide

What is it? And the explanation behind why it is so reactive

What is Manganese Heptoxide?

1

  • It was Discovered in 1860
  • Has the formula Mn2O7 and has 6 DOUBLE BONDS
  • It also has a charge of -14
  • Non-polar
  • Liquid at room temperature, and has a melting point at 5.7°C
  • Is a very dangerous oxidizer and reacts with nearly every organic compound
  • Possible through hybridization

3D Diagram

What causes a Chemical Reaction?

2

  • A reaction is caused by one or more reactants undergoing a chemical change
  • This can be explained using collision theory
  • Atoms must collide at the right orientation and energy for break and from new bonds
  • This is called activation energy
  • There are six factors that affect the rate of a reaction
  • Increasing temperature speeds up atoms and allows more to reach activation energy

Tempe--rature

Pressure

  • Works for gases, brings atoms closer together, allowing for more collisions

Conce-ntration

  • Works for solutions, having a larger abundance of an atom increase the amount of collisions
  • Electronegativities affect the activation energy (Higher electronegativity, lower activation energy), increasing the rate of reaction

Nature of Reactants

Catalyst

Catalyst

  • Catalysts lower activation energy of a reaction
  • Increasing surface area allows for more collisions to occur around the atoms

Surface Area

Fun Fact: Hypergolic reactions are the same reactions performed to ignite rocket ships in and out of oxygen deprived environments

What Reaction Does Manganese Heptoxide undergo?

3

  • It undergoes an redox or oxidation reaction
  • It can also undergo autoxidation, oxidizing with itself
  • The true name is hypergolic reaction
  • Oxidation works by breaking bonds and giving electrons to the receiving element/compound
  • Ex. Fruits browning, metal rusting, fluorine

Example of Oxidation

Why is Manganese Heptoxide so Reactive?

4

  • Having 6 double bonds and a charge of -14 makes it fourteen unstable
  • Lots of energy within in double bonds
  • Has seven oxygen, which is a very reactive element
  • When a bond is broken to oxidize, which will always happen, the atom must constantly re-hybridize to stay stable
  • But in the process after each bond is broken, more energy is produced
  • Reactions have an upward of 57°C.

Fun Fact: The ozone produced can undergo a combustion reactions immediately after its is produced, if the energy produced is high enough

Reaction

  • An oxidation reaction with Mn2O7 creates the products of MnO2 + O2 + O3 (ozone).
  • It can then undergo a combustion reaction (depending on other reagent in sequence
  • Creating the products CO2 and H2O

How is Manganese Heptoxide Formed?

  • Is created at room temperature (22°C)
  • Is an exothermic reaction, producing energy when formed

5

2KMnO4(s) + H2SO4 (aq) -> Mn2O7 (aq) + H2O (l) + 2KHSO4 (aq)

2KMnO4(s) + H2SO4 (aq)

Activation energy would be 22°C

Mn2O7 (aq) + H2O (l) + 2KHSO4 (aq)

Enthalpy Diagram

Would be a negative value because this is an exothermic reaction

Are there any Applications of this Compound?

6

  • No, none that aren't done better by other compounds
  • Best thing I could think of:
  • Oxidizing agent for rocket engines
  • Entertaining videos for bored grade 12 chem students to watch
  • With it being so volatile, it is hard to find anything useful

Video Time

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