For isoelectronic ions, how are effective nuclear charge and ionic radius related?

A) As nuclear charge (Z) increases, ionic radius increases.

B) As nuclear charge (Z) increases, ionic radius decreases.

If you're in K12, then the answer is "the electron releases energy".

When an electron falls to a lower energy level, the electron releases energy. Thus, the correct option for this question is B.

Electrons may be defined as the type of sub-atomic particles that are continuously revolving around the nucleus of an atom. These sub-atomic particles are typically negatively charged.

This is due to the electrostatic force between the nucleus of the atom and electrons. It leads to the centripetal force on the electrons and makes them to revolve around the nucleus.

It is a principle phenomenon that when an electron falls from a higher energy level to a lower energy level, it accelerates. This is because the energy that is stored in these sub-atomic particles now tends to be released. It also leads to the formation of electromagnetic radiations due to the differences in energy levels.

Therefore, when an electron falls to a lower energy level, the electron releases energy. Thus, the correct option for this question is B.

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Answer : The correct option is, Balance.

Explanation :

Mass is measured against a standard using a balance.

Volume is measured against a standard using a graduated cylinder, burette.

The amount of heat produced or absorbed in the chemical reaction is measured against a standard using a calorimeter.

Hence, the mass is measured against a standard using a balance.

The balanced chemical reaction here is:

C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(l)

Calculating for the molar change in enthalpy:

Enthalpy change = 3(-393.5) + 4(-285.83) - (-103.85) = -2220.0 kJ/mole 

Now, propane has a molar mass of 44g/mol. So, for us to calculate the heat released by burning 14 grams of propane, we have: 
-2220 kJ/mole * ( 14g / 44g/mol) = -706.36 kJ 

Answer:

-706.36 kJ 

(negative means heat is released)

Answer:The alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source.

Explanation:

it was correct i did it today

The frequency of the n = 6 line in the Lyman series of hydrogen is [tex]\boxed{{\mathbf{3}}{\mathbf{.196 \times 10 }}{{\mathbf{s}}^{{\mathbf{ - 1}}}}}[/tex].

Further Explanation:

The given problem is based on the concept of the emission spectrum of a hydrogen atom.

Lyman series:

When an electron undergoes transition from any higher energy orbit [tex]\left({{{\text{n}}_{\text{f}}}=2,{\text{ }}3,{\text{ }}4,...}\right)[/tex] to first energy orbit [tex]\left({{{\text{n}}_{\text{i}}} = 1}\right)[/tex] then it emits the energy to complete the process. This spectral lines formed due to this emission is known as the Lyman series of hydrogen atom.

The formula to calculate the energy of transition in the hydrogen atom is,

[tex]\Delta E={R_{\text{H}}}\left({\frac{1}{{{{\left({{{\text{n}}_{\text{i}}}}\right)}^2}}}-\frac{1}{{{{\left({{{\text{n}}_{\text{f}}}}\right)}^2}}}}\right)[/tex]

Where,

[tex]\Delta E[/tex] is the energy difference between two energy levels.

[tex]{R_{\text{H}}}[/tex] is a Rydberg constant and its value is [tex]2.179 \times {10^{ - 18}}{\text{ J}}[/tex].

[tex]{{\text{n}}_{\text{i}}}[/tex] is the initial energy level of transition.

[tex]{{\text{n}}_{\text{f}}}[/tex] is the final energy level of transition.

Substitute the 1 for [tex]{{\text{n}}_{\text{i}}}[/tex] , 6 for [tex]{{\text{n}}_{\text{f}}}[/tex] and [tex]2.179\times {10^{ - 18}}{\text{ J}}[/tex] for [tex]{{\text{R}}_{\text{H}}}[/tex] in the above formula to calculate the value of energy of the given transition.

[tex]\begin{aligned}\Delta E &={R_{\text{H}}}\left({\frac{1}{{{{\left( {{{\text{n}}_{\text{i}}}}\right)}^2}}} \frac{1}{{{{\left({{{\text{n}}_{\text{f}}}}\right)}^2}}}}\right)\\&=\left({2.179 \times {{10}^{ - 18}}{\text{ J}}} \right)\left({\frac{1}{{{{\left( {\text{1}}\right)}^2}}}-\frac{1}{{{{\left({\text{6}} \right)}^2}}}}\right)\\&={\mathbf{2}}{\mathbf{.118 \times 1}}{{\mathbf{0}}^{{\mathbf{ - 18}}}}{\mathbf{ J}}\\\end{aligned}[/tex]

Now we can calculate the frequency of the given transition by using the following formula.

[tex]\Delta E = hv[/tex]

Where,

[tex]\Delta E[/tex] is the energy difference between two energy levels.

[tex]h[/tex] is a Plank’s constant and its value is [tex]6.626\times {10^{ - 34}}{\text{ Js}}[/tex].

v is a frequency of the transition.

Rearrange the above formula to calculate the frequency of the given transition and substitute the value of [tex]\Delta E[/tex].

[tex]\begin{aligned}\Delta E&=hv\hfill\\v&=\frac{{\Delta E}}{h}\hfill\\&=\frac{{{\text{2}}{\text{.118}} \times {\text{1}}{{\text{0}}^{ - {\text{18}}}}{\text{ J}}}}{{6.626 \times {{10}^{ - 34}}{\text{ Js}}}} \hfill\\&={\mathbf{3}}{\mathbf{.196 \times 10 }}{{\mathbf{s}}^{{\mathbf{ - 1}}}} \hfill \\\end{aligned}[/tex]

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Structure of atom

Keywords: Lyman series of hydrogen, hydrogen, n=6 transition, emission spectra, Plank’s constant, transition, energy orbits.

Adding a too small volume of sodium hydroxide solution during titration will give an acetic acid content for the vinegar that is too low.

The error that will give an acetic acid content for the vinegar that is too low is adding a too small volume of sodium hydroxide solution during titration. In this case, the student titrated 25.00 ml of the vinegar, and if the volume of sodium hydroxide solution added is insufficient, it will not neutralize all the acetic acid present in the vinegar. This will result in a lower calculated concentration of acetic acid in the vinegar.

Answer:

a lighthouse on a nearby island

Explanation:

The ships passengers are moving at the same velocity as the ship therefore according to their reference point the ship is not moving. The same is true with the captain and the cargo inside the hull of the ship. But from a light house , which has a different velocity as the ship, the ship is moving.

To help you understand, look at a person sat next to you in the car, does it look like that person is moving? No, because you have the same velocity as them. Now look outside at the ground, it looks like it is moving because you have different velocities.

It is A because in the introduction it talked about how Matthias Schleiden and Theodor Schwann determined that all living things are made of cells (so any living organic organism) However, many other scientists like Rudolf Virchow contribute to the theory.

The jellyfish, mushrooms, oak trees, and bacteria contain cells. The component of cell theory does this best illustrate all living things are made of cells. Therefore, option A is correct.

According to the cell theory, cells make up every biological entity; they are the basic building block of life, and all life originates from earlier forms of life.

Nowadays, the cell idea has become one of the guiding concepts of biology due to its widespread acceptance.

The unicellular and multicellular organisms that have a full, distinct cellular structure with cell organelles, make energy by burning food, and reproduce include bacteria, algae, and fungus. All therefore fall within the category of living things and the cell idea.

Thus, option A is correct.

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The chemical formula for the compound formed between magnesium and selenium is MgSe. This result occurs because magnesium loses 2 electrons and selenium gains 2 electrons form an ionic bond.

The chemical formula for the compound formed between magnesium and selenium is MgSe. Magnesium (Mg) is a group 2 element and therefore has 2 valence electrons that it wants to lose in order to achieve a stable full outer electron shell. Selenium (Se), a group 16 element, needs 2 more electrons to achieve the same stability. Thus, when magnesium and selenium form an ionic bond, the magnesium atom transfers its 2 electrons to selenium, creating a magnesium ion (Mg2+) and a selenium ion (Se2-), which then combine to form the compound MgSe.

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its all of these trust me

Acetaminophen as a chemical formula of C8H9NO2. The molar masses are:

C8H9NO2 = 151.163 g/mol

C = 12 g/mol

H = 1 g/mol

N = 14 g/mol

O = 16 g/mol

TO get the mass percent, simply multiply the molar mass of each elements  with the number of the element divide by the molar mass of acetaminophen, that is:

%C = [(12 * 8) / 151.163] * 100% = 63.50%

%H = [(1 * 9) / 151.163] * 100% = 5.954%

%N = [(14 * 1) / 151.163] * 100% = 9.262%

%O = [(16 * 2) / 151.163] * 100% = 21.17% 

Binding energy per nucleon for 5525mn is 8.95 MeV/nucleon. The nuclear binding energy for a nuclide like 55²25Mn can be found by determining the mass defect from experimental mass and calculated mass of nucleons. Multiplying the mass defect by the conversion factor of 931 MeV/amu gives the total binding energy, which when divided by the number of nucleons, yields the binding energy per nucleon.

To calculate the nuclear binding energy for 5525Mn, we need to know the experimental mass of the nuclide and use the mass defect to find the total nuclear binding energy, which can then be divided by the number of nucleons to get the binding energy per nucleon. First, please find the experimental mass of 5525Mn in atomic mass units (amu) from the provided Table or credible sources. The mass defect is the difference between the sum of the individual masses of protons and neutrons and the actual mass of the nucleus.

Once the mass defect (Δm) is determined, we multiply it by the mass-energy equivalence conversion factor of 931 MeV/amu to get the total binding energy (E) in megaelectronvolts (MeV). The formula is:

E = Δm x 931 MeV/amu

To find the binding energy per nucleon, simply divide the total binding energy by the number of nucleons (A). The formula is:

Binding energy per nucleon = E / A

For instance, if the mass defect for 5525Mn turns out to be 0.528462 amu, the total binding energy would be:

E = 0.528462 amu x 931 MeV/amu = 492 MeV

And the binding energy per nucleon would be:

Binding energy per nucleon = 492 MeV / 55 nucleons = 8.95 MeV/nucleon

Binding energy per nucleon for 5525mn is 8.95 MeV/nucleon.

Isotopes of the same element differ in their mass numbers due to varying numbers of neutrons, while their chemical properties remain the same since they have identical numbers of protons and electrons.

Isotopes of the same element have different mass numbers. This is because although isotopes have the same number of protons, and therefore the same atomic number, they contain different numbers of neutrons. Remember that the mass number (A) is the sum of the numbers of protons and neutrons in the nucleus of an atom. Since neutrons add to the mass but do not change the chemical properties, isotopes typically exhibit identical chemical behavior.

The difference in neutron count is why isotopes have varying atomic masses. For example, Chlorine-35 has 18 neutrons and Chlorine-37 has 20 neutrons, but both have the same atomic number as they both contain 17 protons. Instead of affecting chemical reactivity, this variance influences the atomic weight of the element as it appears on the periodic table.

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The chemical equation for this combustion reaction is:

C8H18  +  O2  -->  CO2  +  H2O

Balancing by adding whole number coefficients:

2 C8H18  + 25 O2  -->  16 CO2  + 18 H2O

Including the phases:

2 C8H18 (l)  + 25 O2 (g)  -->  16 CO2 (g) + 18 H2O (l)

where g is gas and l is liquid

Ans: 0.709 moles glycerin

The given reaction is:

14KMnO4 + 4C3H5(OH)3 → 7K2CO3 + 7Mn2O3 + 5CO2 + 16H2O

a) Based on the reaction stoichiometry:

5 moles of CO2 requires 14 moles of KMnO4

Therefore, 0.886 moles of CO2 would correspond to:

= 0.886 moles CO2 * 14 moles KMnO4/5 moles CO2

= 2.48 moles

b) Again from the reaction stoichiometry:

5 moles of CO2 requires 4 moles of glycerin

therefore, 0.886 moles of CO2 would consume:

= 0.886 moles CO2 * 4 moles glycerin/5 moles CO2

= 0.709 moles

Answer:

2.48  0.709

i got it right on edg so enjoy

Answer:

solid liquid liquid solid

In the colloid blood, the dispersed state of matter is the blood cells and the dispersion medium is plasma. Similarly, in fruit jelly, juice is the dispersed state of matter and pectin is the dispersion medium.

In a colloid, like blood and fruit jelly, there are two parts: the dispersed state of matter and the dispersion medium. In the case of blood, the dispersed state of matter is the blood cells (both red and white blood cells) and the dispersion medium is plasma. This means that the blood cells (solid phase) are distributed throughout the plasma (liquid phase).

For fruit jelly, the dispersed state of matter is the juice and the dispersion medium is pectin. This means that the juice (liquid phase) is distributed throughout the pectin (solid phase). So, pectin acts as a stabilizing structure that holds the juice in place, even at room temperature.

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Final answer:

The enantiomeric excess (ee) of a mixture containing 75% of one compound and 25% of its enantiomer is 50%, calculated using the formula [(% more abundant enantiomer - 50) × 100] / 50.

Explanation:

If a mixture contains 75% of one compound and 25% of its enantiomer, the enantiomeric excess (ee) can be calculated using the formula: ee = [(% more abundant enantiomer - 50) × 100] / 50. In this scenario, the mixture consists of 75% of one enantiomer and 25% of its counterpart. To calculate the enantiomeric excess, you subtract 50 from the percentage of the more abundant enantiomer, which is 75%, and then multiply by 100, and divide the result by 50.

Therefore, the ee = [(75-50) × 100] / 50 = [(25 × 100) / 50] = 50%. This means that the mixture has a 50% enantiomeric excess of the more abundant enantiomer.

Water added to khc8h4o4 has no effect on data, while water added to NaOH solution can drastically affect data.

When water is added to khc8h4o4 (potassium hydrogen phthalate), it has no effect on the data because khc8h4o4 is insoluble in water. Therefore, adding water to it does not change its mass or affect the titration process. On the other hand, when water is added to the NaOH solution, it can drastically affect the data because NaOH is a strong base that can dissolve in water and alter the concentration. Adding water to the NaOH solution increases the volume of the solution and dilutes it, leading to inaccurate data.

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