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HACTEHA [7]
4 years ago
10

In 1930 the American physicist Ernest Lawrence designed the first cyclotron in Berkeley, California. In 1937 Lawrence bombarded

a molybdenum target with deuterium ions, producing for the first time an element not found in nature. Starting with molybdenum-96 as your reactant, write a nuclear equation to represent this process.
Chemistry
1 answer:
IrinaK [193]4 years ago
3 0

Answer:

⁹⁶₄₂Mo + ²₁H ⇒ ⁹⁸₄₃Tc

Explanation:

During the bombardment of a molybdenum target with deuterium ions, an element not found in nature was produced.The name of the element formed in the process is technetium. It is an element with the symbol Tc, mass number of 98, and atomic number 43. The nuclear equation is shown below:

⁹⁶₄₂Mo + ²₁H ⇒ ⁹⁸₄₃Tc

Technetium is the lightest element whose isotopes are all radioactive in nature except the fully ionized state of isotope ⁹⁷Tc. It is silvery gray in color and can be found between manganese and rhenium in group seven of the periodic table.

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Gaseous ammonia chemically reacts with oxygen gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of oxyge
AlekseyPX

Answer: The correct answer will be 5 moles, because according to the  stoichiometric ratio, 5 moles of oxygen produce 6 moles of water.

Explanation:

The balanced equation is:

4NH_{3} + 5O_{2} ⇒ 4NO + 6H_{2}O

As you can see in the balanced reaction, it is necessary 5 moles of oxygen for obtain 6 moles of water. This stoichiometric ratio can be used for calculate any amount of produced water, once you have a specific amount of oxygen.

8 0
4 years ago
About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes,
Stolb23 [73]

Answer:

Two-third of the toxic metal, mercury comes from gold mining.

Explanation:

During gold mining small pieces of gold which are within  the soil are separated with the help of mercury. Both gold and mercury are mixed and they forms amalgam. Further gold can be extracted by vaporizing the mercury, thus releasing it into air and contributing to two-third of the air pollution by human activities.

Therefore (d) gold mining is the correct answer.

7 0
3 years ago
What happened to the molecule when the electron was promoted to the antibonding orbital?.
____ [38]

the bond will break

The bond will dissolve (break) if the electron absorbs a photon and is moved from a bonding molecular orbital to an antibonding orbital since there is no longer an overall stabilizing interaction.

<h3>What is an antibonding orbital?</h3>

An antibonding molecular orbital is the molecular orbital created by the destructive overlapping of atomic orbitals.

<h3>Why is it called antibonding orbital?</h3>
  • Every atom will add one electron to the bond that makes up the lower energy bond.
  • To prevent interacting with the other two electrons, the additional electron will occupy a higher energy state.
  • The antibonding orbital is the name of this higher energy orbital.

<h3>What orbitals form an antibond?</h3>
  • The bonding orbitals are home to electrons that spend the majority of their time between the nuclei of two atoms, whereas the antibonding orbitals are home to electrons that spend the majority of their time outside the nuclei of two atoms.

<h3>When an electron was elevated to the antibonding orbital, what happened?</h3>
  • In contrast, putting electrons in antibonding orbitals will make the molecule less stable.
  • The energy levels of the orbitals will determine how many electrons are filled.
  • The lower energy orbitals will be filled first, and then the higher energy orbitals.
<h3 />

To learn more about antibonding orbitals visit:

brainly.com/question/17303393

#SPJ4

4 0
2 years ago
50 extra if correct !!
leva [86]

Answer:

A.

Explanation:

the gradual movement of the continents across the earth's surface through geological time.

7 0
3 years ago
Can anyone give me tips on how to present 4-6 mark questions in science assessments? I understand the logic but I find it hard t
Vlad1618 [11]

Answer:

- start by recycling the question

- explain the topic using key words related to that topic

- include a few examples/data if it's using a graph/photo

5 0
3 years ago
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