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Ghella [55]
4 years ago
9

An electron jumps from energy level 1 to energy level 2 by absorbing a photon of energy 8 eV. What is the most likely energy of

the photon that will be emitted by the electron when it moves back down to energy level 1?
Chemistry
2 answers:
Alex Ar [27]4 years ago
6 0
Should it move back to level, it would lose the energy level it gained.

It would emit 8 eV of energy.
rewona [7]4 years ago
4 0

Answer: 8eV

Explanation:

This is because for an electron to jump from a lower energy level to a higher energy level, there is an exact amount of energy that it is required to absorb and will therefore emit the same amount of energy when falling back to its initial energy level. In this case the energy it absorbed was 8eV and will need to emit 8ev to fall back to the lower energy level.

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Ammonia can be produced in the laboratory by heating ammonium chloride
AnnyKZ [126]

Answer:

Mass = 2.89 g

Explanation:

Given data:

Mass of NH₄Cl = 8.939 g

Mass of Ca(OH)₂ = 7.48 g

Mass of ammonia produced = ?

Solution:

2NH₄Cl   +  Ca(OH)₂     →    CaCl₂ + 2NH₃ + 2H₂O

Number of moles of NH₄Cl:

Number of moles = mass/molar mass

Number of moles = 8.939 g / 53.5 g/mol

Number of moles = 0.17 mol

Number of moles of Ca(OH)₂ :

Number of moles = mass/molar mass

Number of moles = 7.48 g / 74.1 g/mol

Number of moles = 0.10 mol

Now we will compare the moles of ammonia with both reactant.

                      NH₄Cl          :          NH₃

                          2              :           2

                         0.17          :          0.17

                   Ca(OH)₂         :          NH₃

                        1                :           2

                    0.10              :          2/1×0.10 = 0.2 mol

Less number of moles of ammonia are produced by ammonium chloride it will act as limiting reactant.

Mass of ammonia:

Mass = number of moles × molar mass

Mass = 0.17 mol × 17 g/mol

Mass = 2.89 g

6 0
3 years ago
Why do the 8 phases of the moon occur
nadya68 [22]
The phases of the moon occur because the moon orbits earth which causes the portion illuminated to change. The earth casts changing angles on the moon causing portions to be illuminated or dark.
4 0
4 years ago
In a chemical reaction, 300 grams of reactants are combined with 100 grams of reactant
inysia [295]
I believe the mass of the product will be 400 grams. This is because according to the law of conservation of mass, mass is neither created nor destroyed . In a closed system, the mass of reactants is equal to mass of products. Therefore, since the total mass of the reactants is 400 grams then the mass of the products will still be 400 grams
8 0
3 years ago
Read 2 more answers
What is the Law of Conservation of energy?
ladessa [460]

Answer:

<u>~</u><u>Law of Conservation of </u><u>energy~</u>

The law of conservation of energy states that energy can neither be created nor destroyed, only energy can be converted from one form to another.

3 0
3 years ago
How do modern periodic table arranged
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In the modern periodic table, the elements are arranged according to their atomic number - not their relative atomic mass.



In the periodic table the elements are arranged into:

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4 0
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