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Elena-2011 [213]
3 years ago
9

You are working in your laboratory and decide to do some cleaning. You find a test tube with some brown substance congealed at t

he bottom. You take a piece of iron wool to scrub it out, but cannot remove it. You leave the iron wool in the test tube and set it aside to clean your beakers instead. You do not realize the test tube is next to the heater and after a few minutes, a brown gas starts smoking out of the test tube, followed by a reddish-brown gas. Upon observation, the iron wool is coated in a yellow-brown substance. You realize that the mystery substance was
Chemistry
2 answers:
shepuryov [24]3 years ago
6 0

the reddish brown gas is NOX, now you just think the substance reacted with iron is nitrate salt of some metal X......hope you know the Metal X ,,,

Virty [35]3 years ago
5 0

Answer:

The mysterious substance is Nitrogen Dioxide

Explanation:

The mysterious substance is Nitrogen Dioxide in solid form. When heated it releases the reddish-brown gas that has a strong and pungent odor.

It is common to see this gas as a result of the combustion process carried out in thermal plants, especially when the material submitted to combustion is composed of oil or gases. This occurs a lot in many industrial processes and can be seen even in older motor vehicles.

It is important to protect yourself against this gas, because it can cause irritation of the eyes and nose, in addition to pulmonary emphysema, which can be very dangerous.

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The correct answer is slow
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The force against a solid object moving through a gas or a liquid
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A force or a type of friction?

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Friction: Fluid friction which is friction that occurs after a solid object travels through a liquid or gas

5 0
3 years ago
Direct electron transfer from a singlet reduced species to a triplet oxidizing species is quantum-mechanically forbidden
posledela

Direct electron transfer from a a singlet reduced species to a triplet oxidizing species is quantum-mechanically forbidden.

<h3><u>Transfer from singlet to triplet:</u></h3>
  • Either an excited singlet state or an excited triplet state will occur when an electron in a molecule with a singlet ground state is stimulated (through radiation absorption) to a higher energy level.
  • All electron spins in a molecule electronic state known as a singlet are coupled.
  • In other words, the ground state electron and the stimulated electron's spin are still coupled (a pair of electrons in the same energy level must have opposite spins, per the Pauli exclusion principle).
  • The excited electron and ground state electron are parallel in a triplet state because they are no longer coupled (same spin).
  • It is less likely that a triplet state would arise when the molecule absorbs radiation since excitation to a triplet state necessitates an additional "forbidden" spin transfer.

To view more questions on quantum mechanism, refer to:

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8 0
2 years ago
A word of equationn for the reacyion between lithium and water
Elenna [48]

Answer:

Equation: - 2Li + H2O = Li2O + H2 Uncoated lithium metal reacts with water to form a colorless lithium hydroxide solution and hydrogen gas.

Explanation:

4 0
3 years ago
What is wrong with this model of the atom.
sp2606 [1]

Answer:

A. The neutrons and electrons are in the wrong place.

Explanation:

The atom's nucleus contains both protons and neutrons, whilst the electrons are arranged in shells around the nucleus.

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