Chemistry : asked on jada741
 07.05.2023

The photoelectron spectrum for the element boron is represented above. which of the following best explains how the spectrum is consistent with the electron shell model of the atom?

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18.10.2022, solved by verified expert
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Options:

A.The spectrum shows a single electron in the 2p subshell.

B.The spectrum shows equal numbers of electrons in the first and second electron shells.

C.The spectrum shows three electrons with the same binding energy in the second electron shell.

Answer:

A. The spectrum shows a single electron in the 2p subshell.

Explanation:

The figure attached is representation of the photoelectron spectrum for the element boron, which is the missing part of the question.

There are three peaks. Each peak represents one subshell: 1s, 2s, and 2p.

Indeed, Boron has 5 electrons: 2 in the subshell 1s, 2 in the subshell 2s and one in the subshell 2p.

The first peak, the peak to the left of the diagram, is as high as the second peak, meaining there are the same relative number of electrons in the 1s and 2s subshells.

The third peak, the one to the right of the diagram is half as high as the other two peaks, there are half electrons in the 2p subshell as in the 1s and 2s subshells.

Since Boron has five electrons, the photoelectrum spectrum shows that there are two electrons in the 1s subshell,  two electrons in the 2s subshell, and a single electron in the 2p subshell.

Then, as for the answer choices:

A The spectrum shows a single electron in the 2p subshell: correct as explained in the last part of the previous paragraph.

B The spectrum shows equal numbers of electrons in the first and second electron shells: incorrect as it shows two electrons in the first shell (1s) and three electrons in the second shell (2s and 2p).

C The spectrum shows three electrons with the same binding energy in the second electron shell: incorrect as it shows different binding energies for the electrons in the second electron shell: two electrons below 1 MJ/mol, and one above 1 MJ/mol.

The photoelectron spectrum for the element boron, №15242626, 07.05.2023 19:29
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Chemistry
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P Answered by PhD
A. The spectrum shows a single electron in the 2p subshell.

Explanation:

The figure attached is representation of the photoelectron spectrum for the element boron, which is the missing part of the question.

There are three peaks. Each peak represents one subshell: 1s, 2s, and 2p.

Indeed, Boron has 5 electrons: 2 in the subshell 1s, 2 in the subshell 2s and one in the subshell 2p.

The first peak, the peak to the left of the diagram, is as high as the second peak, meaining there are the same relative number of electrons in the 1s and 2s subshells.

The third peak, the one to the right of the diagram is half as high as the other two peaks, there are half electrons in the 2p subshell as in the 1s and 2s subshells.

Since Boron has five electrons, the photoelectrum spectrum shows that there are two electrons in the 1s subshell,  two electrons in the 2s subshell, and a single electron in the 2p subshell.

Then, as for the answer choices:

A The spectrum shows a single electron in the 2p subshell: correct as explained in the last part of the previous paragraph.B The spectrum shows equal numbers of electrons in the first and second electron shells: incorrect as it shows two electrons in the first shell (1s) and three electrons in the second shell (2s and 2p). C The spectrum shows three electrons with the same binding energy in the second electron shell: incorrect as it shows different binding energies for the electrons in the second electron shell: two electrons below 1 MJ/mol, and one above 1 MJ/mol.
The photoelectron spectrum for the element boron is represented above. Which of the following best e
Chemistry
Step-by-step answer
P Answered by PhD
A. The spectrum shows a single electron in the 2p subshell.

Explanation:

The figure attached is representation of the photoelectron spectrum for the element boron, which is the missing part of the question.

There are three peaks. Each peak represents one subshell: 1s, 2s, and 2p.

Indeed, Boron has 5 electrons: 2 in the subshell 1s, 2 in the subshell 2s and one in the subshell 2p.

The first peak, the peak to the left of the diagram, is as high as the second peak, meaining there are the same relative number of electrons in the 1s and 2s subshells.

The third peak, the one to the right of the diagram is half as high as the other two peaks, there are half electrons in the 2p subshell as in the 1s and 2s subshells.

Since Boron has five electrons, the photoelectrum spectrum shows that there are two electrons in the 1s subshell,  two electrons in the 2s subshell, and a single electron in the 2p subshell.

Then, as for the answer choices:

A The spectrum shows a single electron in the 2p subshell: correct as explained in the last part of the previous paragraph.B The spectrum shows equal numbers of electrons in the first and second electron shells: incorrect as it shows two electrons in the first shell (1s) and three electrons in the second shell (2s and 2p). C The spectrum shows three electrons with the same binding energy in the second electron shell: incorrect as it shows different binding energies for the electrons in the second electron shell: two electrons below 1 MJ/mol, and one above 1 MJ/mol.
The photoelectron spectrum for the element boron is represented above. Which of the following best e
Chemistry
Step-by-step answer
P Answered by Master
Answer: 0.0045 mol
Explanation: Convert 30 ml to l: 30 mL = 0.03 L
Molarity = mol/l
mol = molarity * L
mol = 0.15 * 0.03 = 0.0045 mol
Answer: 0.0045 mol
Explanation: Convert 30 ml to l: 30 mL = 0.03 L
Molarity = mol/l
mol = molarit
Chemistry
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P Answered by PhD
Answer: chalcogens.
Explanation: Strontium is an alkaline earth metal, it always exhibits a degree of oxidation in its compounds +2.
Chalcogens are a group of 6 chemical elements (oxygen O, sulfur S, selenium se, tellurium te, polonium Po) that have an oxidation state of -2 => Chalcogens will combine with strontium in a ratio of 1:1.
Chemistry
Step-by-step answer
P Answered by Specialist
Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation:
A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.
For example, in the given diagram there are two individual simple machines.
The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.
Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.
Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation
Chemistry
Step-by-step answer
P Answered by Master

Calcium (Ca)(On the periodic table, ionization energy increases as you go up and to the right of the periodic table)

Calcium (Ca)(On the periodic table, ionization energy increases as you go up and to the right of the
Chemistry
Step-by-step answer
P Answered by PhD

glycoproteins

Explanation:

A positive reaction for Molisch's test is given by almost all carbohydrates (exceptions include tetroses & trioses). It can be noted that even some glycoproteins and nucleic acids give positive results for this test (since they tend to undergo hydrolysis when exposed to strong mineral acids and form monosaccharides).

Chemistry
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P Answered by PhD

Answer:

Taking into accoun the ideal gas law, The volume of a container that contains 24.0 grams of N2 gas at 328K and 0.884 atm is 26.07 L.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P×V = n×R×T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.

Explanation:

In this case, you know:

P= 0.884 atm

V= ?

n= Answer:Taking into accoun the ideal gas law, The volume of a container that contains 24.0 grams of N 0.857 moles (where 28 g/mole is the molar mass of N₂, that is, the amount of mass that the substance contains in one mole.)

R=0.082Answer:Taking into accoun the ideal gas law, The volume of a container that contains 24.0 grams of N

T= 328 K

Replacing in the ideal gas law:

0.884 atm×V= 0.857 moles× 0.082Answer:Taking into accoun the ideal gas law, The volume of a container that contains 24.0 grams of N ×328 K

Solving:

Answer:Taking into accoun the ideal gas law, The volume of a container that contains 24.0 grams of N

V= 26.07 L

The volume of a container that contains 24.0 grams of N2 gas at 328K and 0.884 atm is 26.07 L.

Chemistry
Step-by-step answer
P Answered by PhD
Answer: 7.8125 g
Explanation: Given:
Original amount (N₀) = 500 g
Number of half-lives (n) = 9612/1602 = 6
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^6 × 500
N = 0.015625 × 500
N = 7.8125 g
Chemistry
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P Answered by PhD
Answer: The product formed is potassium chloride.
Explanation:
Precipitation reaction is defined as the chemical reaction in which an insoluble salt is formed when two solutions are mixed containing soluble substances. The insoluble salt settles down at the bottom of the reaction mixture.

The chemical equation for the reaction of potassium phosphate and magnesium chloride follows (look at the picture)

2 moles of aqueous solution of potassium phosphate reacts with 3 moles of aqueous solution of magnesium chloride to produce 1 mole of solid magnesium phosphate and 6 moles of aqueous solution of potassium chloride.
Answer: The product formed is potassium chloride.
Explanation:
Precipitation reaction is defined a

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