which compound(s) can be used at high concentrations to dampen out electrostatic interactions among amino acid residues?

Answer: The 1H NMR spectrum shown below is most likely that of the product obtained from a reaction of ferrocene and acetic anhydride.

The spectrum displays a single peak at 6.6 ppm, which is characteristic of a vinyl proton in a substituted cyclopentadienyl ring. The peak at 5.2 ppm is that of a methylene protons in the acyl substituent. The peak at 1.2 ppm is that of a proton attached to a tertiary carbon. This strongly suggests that the student has successfully synthesized acetyl ferrocene.

Acetyl ferrocene is a stable compound, containing a cyclopentadienyl ring with an acyl substituent attached at one of the ring carbons. It is synthesized by reacting ferrocene with acetic anhydride, a reaction that requires heating. The reaction leads to the substitution of a proton in the cyclopentadienyl ring by an acyl group, resulting in acetyl ferrocene.

The 1H NMR spectrum of this product contains a single peak at 6.6 ppm, indicating the presence of a vinyl proton in the cyclopentadienyl ring, a peak at 5.2 ppm, indicating the presence of a methylene protons in the acyl substituent, and a peak at 1.2 ppm, indicating the presence of a proton attached to a tertiary carbon.

Therefore, it can be concluded that the student has successfully synthesized acetyl ferrocene from ferrocene using acetic anhydride.

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Answer:

The mass of 1 mole of substance is 40 g

Molar Mass is defined as the mass in grams of one mole of a substance. The units of molar mass are grams per mole (g/mol).

This can be found by dividing the mass present by the number of moles. Mathematically, the units: grams ÷ moles = g/mol.

Hence, Molar mass (M) = mass (m) ÷ moles (n).

Therefore, M = m/n = 4/0.1 = 40 g/mol

Orange waves have a lower frequency and contain less energy than green waves.

What is Wave?

A wave is a disturbance or oscillation that travels through space and time, accompanied by the transfer of energy without the transfer of matter. Waves can take many different forms, including sound waves, light waves, water waves, and seismic waves. They can be described in terms of their frequency, wavelength, amplitude, and velocity, among other properties. Waves play a fundamental role in many areas of science and technology, including communication, medicine, and engineering.

The energy of a wave is directly proportional to its frequency, which means that higher frequency waves contain more energy than lower frequency waves. The frequency of a wave refers to the number of complete cycles or oscillations that the wave undergoes per second, and is measured in units of Hertz (Hz).

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The Ksp of lead (II) iodide is 7.1x10-9. If it is measured that the lead concentration in the solution is 0.0003 M, then what is the concentration of iodide in the solution is 1.5 x 10-5 M

Given, the Ksp of lead (II) iodide is 7.1x10-9.

The concentration of lead =

Ksp expression of lead (II) iodide is given as,

PbI2 ⇌ Pb2+ + 2I–Ksp = [Pb2+] [I-]2Here, [Pb2+] = 0.0003MIodide.

concentration:

Let’s consider x as the concentration of iodide.

The equilibrium expression of the dissolution of PbI2 is,

PbI2 ⇌ Pb2+ + 2I–Initial: 0 0

Change: -x +x + 2x

At equilibrium: (0-x) (0+ x) (2x)Ksp = [Pb2+] [I-]2= (0.0003) (2x)2= 7.1x10-9x = 1.5 x 10-5 M

The concentration of iodide in solution is 1.5 x 10-5 M.

An alternate method to solve the problem is using the quadratic equation. We can solve the equation as follows,      

Ksp = [Pb2+] [I-]2

= (0.0003) (2x)2

= 7.1x10-92x2

= 7.1x10-9/0.00032x2

= 79x = 1.5x10-5 M

Therefore, the iodide concentration in the solution is 1.5 x 10-5 M.

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Answer: The reason a diazonium group on a benzene ring cannot be used to direct an incoming substituent to the meta position is due to the fact that diazonium groups are highly reactive and unstable. When they are present on the benzene ring, they tend to undergo rapid chemical reactions, which cause them to be quickly removed from the ring.

This means that they cannot effectively direct incoming substituents to the meta position, as they are not present long enough to exert a significant effect on the reaction. Additionally, the highly reactive nature of diazonium groups makes them prone to react with other reagents in the reaction, which can cause unwanted side reactions and limit the efficiency of the overall reaction.

In conclusion, a diazonium group on a benzene ring cannot be used to direct an incoming substituent to the meta position due to their highly reactive and unstable nature, which causes them to undergo rapid chemical reactions and limits their ability to effectively direct the reaction.

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The radius of a single atom of a generic element x is 123 picometers (pm) and a crystal of x has a unit cell that is body-centered cubic. So, the volume of the unit cell is 11.5482 x 10⁻²⁴ cm³.

Given,

The radius of a single atom of a generic element x is 123 picometers (pm) and a crystal of x has a unit cell that is body-centered cubic.

Body-Centered Cubic (BCC):

In a Body-Centered Cubic unit cell, each corner of the cube has a corner atom, and there is an additional atom in the center of the cube. The atom that is centered on the unit cell is surrounded by eight neighboring atoms, each of which is located at a distance of

4R/√3,

where R is the radius of the atom.

The volume of the unit cell = (4 * radius of the atom)^3/3

For BCC, volume of the unit cell is

(4 * radius of the atom)^3/3

= (4 * 123 pm)^3/3

= 11.5482 x 10⁻²⁴ cm³

The volume of the unit cell is 11.5482 x 10⁻²⁴ cm³.

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The direct product obtained from dehydration of an alcohol is an alkene. (A)

Alkenes are hydrocarbons composed of a double bond between two carbon atoms. The dehydration of an alcohol involves the removal of a water molecule from two hydrogen atoms and an oxygen atom in the alcohol. (A)

This produces an alkene with an alkyl group attached to each carbon atom in the double bond.

A dehydration reaction involves the removal of a molecule of water from a compound. In the case of an alcohol, this typically involves the removal of the hydroxyl (-OH) group and a hydrogen atom from adjacent carbon atoms.

The resulting molecule is an alkene, which contains a double bond between the two carbon atoms that were previously bonded to the -OH group and the hydrogen atom.

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complete question

which of the following could be the direct product obtained from dehydration of an alcohol.

A) Alkene

B) Alkane

C) Alkyne

D) Ketone

Answer:

1) 492 grams Na3PO4

2) 1,476 grams Na3PO4

Explanation:

6.0 mol NaOH forms 3.0 mol Na3PO4

9.0 mole H3PO4 forms 9.0 mol Na3PO4.

What mass of Na3PO4 forms?

1)  6.0 moles of NaOH

3.0 moles of Na3PO4 are formed.  Convert thism into grams using the molar mass conversion factor:  164 g/mole

(3.0 moles Na3PO4)*(164 g/mole Na3PO4) = 492 grams

2)  9.0 moles of H3PO4

9.0 moles of Na3PO4 are formed.  Again, use the molar mass conversion factor.

(9.0 moles Na3PO4)*(164 g/mole Na3PO4) = 1,476 grams Na3PO4

The VSEPR (Valence Shell Electron Pair Repulsion) theory is used to predict the shapes of molecules based on the arrangement of electron pairs around the central atom.

The VSEPR theory assigns a numerical value, called the "VSEPR number", to each central atom in a molecule.

The first digit of the VSEPR number corresponds to the number of electron pairs around the central atom that are involved in bonding. Specifically:

The first digit of the VSEPR number is used to determine the general electron pair geometry around the central atom, which is a crucial factor in determining the molecular geometry of the molecule.

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When 32.0 g of H2 and 12.0 g of O2 are mixed and allowed to react to form water, the end result will be 44.0 g of H2O.

This is because the equation for the reaction is 2H2 + O2 = 2H2O, so for every two grams of H2 that are present, one gram of O2 must be present to balance the equation. Therefore, 32.0 g of H2 and 12.0 g of O2 will result in 44.0 g of H2O.
To solve this problem, first calculate the amount of H2 and O2 needed to create the desired amount of H2O. Using the equation, the ratio of H2 to O2 is 2:1, so the total amount of O2 needed to react with the given amount of H2 is 16.0 g (32.0 g of H2 divided by 2). Next, calculate the amount of H2O that will be produced. To do this, use the equation 2H2 + O2 = 2H2O, so the total amount of H2O produced is twice the amount of H2 and O2, or 44.0 g (32.0 g of H2 + 16.0 g of O2 = 48.0 g, then divided by 2 = 24.0 g).
Therefore, when 32.0 g of H2 and 12.0 g of O2 are mixed and allowed to react to form water, the end result will be 44.0 g of H2O.

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Answer: I have selected the gemstone turquoise from the United States. Turquoise is a semi-precious gemstone composed of copper aluminum phosphate. It is found in the deserts of Nevada, Arizona, Colorado, and New Mexico. Turquoise has a long history of use, with some pieces found in Ancient Egyptian tombs and Native American jewelry. Turquoise is still used today for making jewelry, figurines, and inlays for furniture. It is also often used to decorate clothes and other items.

Turquoise is created through the process of sedimentary precipitation, which involves the accumulation of minerals in slow-moving water. This process takes thousands of years, and is further shaped by the elements, such as air and water, which break down the mineral and change its color. It can also be artificially altered to improve its color.

In everyday life, turquoise is primarily used for jewelry, but it is also thought to possess healing properties. In some cultures, turquoise is believed to bring good luck and is used to ward off evil spirits. Turquoise has been a popular choice for making jewelry and decorative objects since ancient times. It is a beautiful, vibrant gemstone with a wide range of colors and patterns, which makes it a highly sought after material.

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For extraction, there should be an option c) lower solute solubility in the second phase.

Extraction is a process in which a solute is separated from a solution or mixture by two immiscible liquid phases. It involves two phases in which the solute has different solubilities.

In the first phase, the solute has higher solubility, meaning it dissolves more readily.

In the second phase, the solute has lower solubility, meaning it is less likely to dissolve.

In order for extraction to be successful, the solute must be differently soluble in the phases. This ensures that the solute is separated efficiently and effectively.


The process of extraction involves the formation of two liquid phases and the transfer of the solute from one phase to the other. The solute is transferred from the first phase to the second phase, where it is separated from the solution.


To summarize, extraction is a process of separating a solute from a solution or mixture by two immiscible liquid phases. It involves two phases in which the solute has different solubilities.

Therefore, for extraction, it is necessary for the solute to have a lower solubility in the second phase. and hence the correct answer is option c.

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Answer: The heat treatment operation performed on the compact to bond metallic particles is known as sintering.

What is sintering?

Sintering is a heat treatment process in which particles of a material are compressed into a strong mass, typically by heat but sometimes by pressure or other means. This process is mostly used for manufacturing ceramics, metals, and plastics.

The goal of sintering is to make a material more durable and compact, and it can be done in several ways.In general, sintering is used to manufacture components that are strong, resistant to wear and tear, and have high heat resistance.

Because sintering involves the use of heat, it can be used to remove defects from materials and create components with high dimensional accuracy.

In addition, sintering can be used to produce a wide range of shapes and sizes, making it a versatile manufacturing technique.

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To familiarize students with experimental tools, the scientific method, and data analysis techniques so that they can understand the inductive process that led to the concepts.

Give a complete sentence description of each stage of the process. It also offers possible explanations (your hypothesis(es)) for what you anticipated the experiment to show. There should be one to three paragraphs in this part.

Before moving the study into clinical trials, experimental research enables you to test your hypothesis in a controlled setting. Additionally, it offers the best way to test your hypothesis due to the following benefits.

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If the balloon is popped and all of the CO2 is released, approximately 5.4 grams of CO2 would be released.

At STP (Standard Temperature and Pressure), the pressure is 1 atmosphere (atm) and the temperature is 273.15 K (0 °C or 32 °F).Any ideal gas has a molar volume of 22.4 L/mol at STP.

Carbon dioxide (CO2) seems to have a molar mass of approximately 44 g/mol.

Using the ideal gas law, PV = nRT, we can calculate the number of moles of CO2 in the balloon:

PV = nRT

n = PV/RT

n = (1 atm)(3 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 0.1226 mol

Therefore, the balloon contains 0.1226 mol of CO2.

To calculate the mass of CO2, we can use the following formula:

mass equates to the number of moles multiplied by the molar massmass = 0.1226 mol x 44 g/mol

mass = 5.4 g

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Explanation:

The Air Quality Index (AQI) informs the public about daily air quality levels, including the amount and size of particulate matter in the air. It provides a standardized measurement to help people understand how clean or polluted the air is in their area and how it may affect their health. The AQI typically reports levels of common air pollutants such as ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. The AQI scale ranges from 0 to 500, with higher values indicating more severe air pollution and greater potential health effects.

Answer:

Methane is a compound that consists of one carbon atom and four hydrogen atoms per molecule. Methane decomposes into two simpler substances, hydrogen and carbon. Therefore, methane is a compound.

What is Methane?

Methane is a colorless, odorless, and flammable gas that has a molecular formula of CH4. Methane is the primary component of natural gas, which is formed from the decay of organic matter deep beneath the Earth's surface.

Methane is a potent greenhouse gas that is more effective at trapping heat than carbon dioxide, despite the fact that it does not remain in the atmosphere for as long.

A component is a pure substance that cannot be separated into simpler substances by physical or chemical methods. Elements and compounds are the two types of components.

Elements are the simplest forms of matter and cannot be separated into simpler substances by chemical means. On the other hand, compounds are made up of two or more elements in definite proportions and can be separated into simpler substances by chemical means.

Thus, methane is a compound.



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The correct reduction half-reaction for the given chemical equation (Zn(s) + CuSO₄(aq) → Cu(s) + ZnSO₄(aq)) is:

Cu²⁺(aq) + 2e⁻ → Cu(s)

1. First, let's identify the species that are changing their oxidation states in the reaction. It's zinc (Zn) and copper (Cu).

2. Zn is undergoing oxidation, as it is losing electrons and forming Zn²⁺ in ZnSO₄. Cu²⁺ from CuSO₄ is gaining electrons and forming elemental copper (Cu).

3. Now, we'll focus on the copper half-reaction to find the reduction half-reaction. Reduction is the process of gaining electrons, so we need to identify the half-reaction where Cu²⁺ gains electrons.

4. The given reduction half-reaction is Cu²⁺(aq) + 2e⁻ → Cu(s), which represents the process where Cu²⁺ ions from the copper sulfate solution gain two electrons to form solid copper.

5. To confirm this, we can check the other options provided:

a. Ag⁺(aq) + Cl⁻(aq) → AgCl(s) - This is a precipitation reaction

b. Fe²⁺(aq) → Fe³⁺(aq) + e⁻ - This is an oxidation half-reaction involving iron

c. HF(aq) + OH⁻(aq) → H₂O(l) + F⁻(aq) - This is an acid-base neutralization reaction

So, the correct reduction half-reaction for the given chemical equation is Cu²⁺(aq) + 2e⁻ → Cu(s).

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The correct answer is C. Silicon and Germanium are semiconductor elements. A semiconductor is a material that has properties of both an insulator and a conductor.

It can be used to create transistors, which are components that can be used to amplify or switch electronic signals.

Semiconductor elements are made up of different atoms that have at least four electrons in their outer shell. The four electrons are what gives them their semi-conductive properties.

Silicon and Germanium are two of the most common semiconductor elements.

Silicon is the most widely used semiconductor element. It has four electrons in its outer shell and is found in nature as a component of sand and quartz.

Silicon has the ability to easily form bonds with other atoms, which makes it a great choice for semiconductor devices.

Germanium is also a commonly used semiconductor element. It has four electrons in its outer shell and is a component of coal and many other minerals.

Germanium has a slightly higher electron mobility than Silicon, which makes it better suited for certain types of transistors.

In conclusion, Silicon and Germanium are semiconductor elements. They have four electrons in their outer shell and are used in transistors and other semiconductor devices.

Silicon is the most widely used semiconductor element due to its ability to form strong bonds with other atoms, while Germanium is better suited for certain types of transistors due to its higher electron mobility.

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Evaporation is a different term for it. As particles move more quickly than liquid molecules, a liquid needs energy to transform into a gas.

vaporisation is the process by which a substance is transformed from its liquid or solid state into its gaseous (vapour) state. Boiling is the term for the vaporisation process when conditions permit the creation of gas bubbles within a liquid. Sublimation is the process of directly converting a solid into a vapour.

The ratio of the time needed to evaporate a testing solvent to the time needed to evaporate a reference solvent under the same circumstances is the evaporation rate. The findings can be shown as either a percentage of the total amount evaporated within a given time frame, the amount of time needed to evaporate, or a relative rate.

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The final pressure of nitrogen gas, at a fixed temperature and number of moles, with a final volume of 214 ml is 552 torr.

The pressure and volume of an ideal gas are inversely proportional to each other, meaning if one increases, the other decreases. This can be expressed by the equation PV=nRT, where n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Since n and T remain constant, the equation can be rearranged to solve for pressure as P=nRT/V. Using the given values, P= (1)(0.08206)(273.15)/(214 ml) = 552 torr.

Thus, the final pressure of nitrogen gas at a fixed temperature and number of moles, with a final volume of 214 ml is 552 torr.

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The relative abundance of each isotope in the mixture and the isotopic mass of each isotope determines the average atomic mass of an element.

The average masses of the atoms of beryllium and fluorine are found in the attachment.

The average atomic mass of lithium is 6.9418 amu.

The average atomic mass of lithium is obtained from the isotopic mass and relative abundance of the two isotopes of lithium.

Isotopic mass of lithium-6 = 6.015 amu

Isotopic mass of lithium-7 = 7.016 amu

To calculate the average atomic mass, we use the formula:

average atomic mass = [(isotopic mass of isotope 1 x number of atoms of isotope 1) + ( isotopic mass of isotope 2 x number of atoms of isotope 2)] / total number of atoms

Substituting the values:

average atomic mass of lithium = [(6.015 amu x 3) + (7.016 amu x 2)] / 5

average atomic mass = 6.9418 amu

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Complete question:

1. What are the factors that affect the average atomic mass of a mixture of isotopes?

2. Beryllium (Be) and Fluorine (F) have only one stable isotope. Use the periodic table to complete the following table of the average atomic mass of one atom, two atoms, and three atoms of the isotopes

4. Lithium has only two stable isotopes. Use the sim to determine the following:

a. Atomic mass of lithium-6 = amu

b. Atomic mass of lithium-7= amu

c. Average atomic mass of a sample containing three lithium-6 atoms and two lithium-7 atoms = amu

Answer:

The reaction between butanoic acid and ethanol produces ethyl butyrate and water, and the balanced chemical equation is:

Butanoic acid + Ethanol → Ethyl butyrate + Water

The molar mass of butanoic acid is 88.1 g/mol, and the molar mass of ethanol is 46.1 g/mol. The molar mass of ethyl butyrate is 116.2 g/mol.

To determine the amount of ethyl butyrate produced, we need to use stoichiometry and the given mass of butanoic acid to find the number of moles of butanoic acid, and then use the mole ratio to find the number of moles (and mass) of ethyl butyrate produced.

Calculate the number of moles of butanoic acid:

moles of butanoic acid = mass/molar mass = 7.00 g / 88.1 g/mol = 0.0795 mol

Use the mole ratio to find the number of moles of ethyl butyrate produced:

From the balanced equation, we see that 1 mole of butanoic acid reacts with 1 mole of ethanol to produce 1 mole of ethyl butyrate.

So, the number of moles of ethyl butyrate produced = 0.0795 mol (since we assume a 100% yield)

Calculate the mass of ethyl butyrate produced:

mass of ethyl butyrate = moles x molar mass = 0.0795 mol x 116.2 g/mol = 9.23 g

Therefore, 9.23 grams of ethyl butyrate would be synthesized if 7.00 grams of butanoic acid were reacted with excess ethanol, assuming a complete 100% yield.

The new volume of the gas is approximately 29.5 L when the temperature is raised to 350K and the pressure is lowered to 1.5 atm.

To solve this problem, we can use the combined gas law, which states that,

(P1 × V1) / T1 = (P2 × V2) / T2

where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.

We can plug in the given values to get,

(2.3 atm × 17 L) / 299 K = (1.5 atm × V2) / 350 K

Solving for V2,

V2 = (2.3 atm × 17 L × 350 K) / (1.5 atm × 299 K)

V2 = 29.5 L

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Because of the addition of one electron, the effective nuclear charge falls and repulsion rises, causing electrons to be further apart and therefore increasing atomic size. We also know that anion has a bigger size than the parent atom, therefore Br- will have the highest atomic size.

The radius of the bromide ion Br- is greater.

Anions are more massive than their parent atoms. The anion's extra electron increases electron-electron repulsion. Since electrons spread out further in space, an anion has a wider radius than its parent atom.

Bromine belongs to the halogen group, which also contains fluorine, chlorine, iodine, and astatine.

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Answer:

C

Explanation: Your welcome

To perform an experiment to determine the cause of the resting potential by adjusting the ionic concentrations, you will need to complete the following steps.

First, you should set up the appropriate apparatus for the experiment. This will include a solution chamber, an electrode, a reference electrode, and a recording device.

Second, you should prepare the solutions in the chamber, adjusting the concentrations of the various ions. You may want to begin with a balanced solution, then adjust one of the ions while keeping the others constant.

Third, you should measure the resting potential of the cell. Record the values of the resting potential as you adjust the ion concentrations.

Fourth, you should analyze the data. You can look for correlations between the resting potential and the concentration of the ions.

Finally, you should form a conclusion. From your data, you should be able to determine which ion(s) are responsible for the resting potential.

By following these steps, you can conduct an experiment to determine the cause of the resting potential by adjusting the ionic concentrations.

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The burning of 1 gram carbohydrate release 16,736 J of heat energy.

Burning a 1 gram carbohydrate sample raised the temperature of the 500 gram water bath by 8°C, to calculate how much heat energy was released by the carbohydrate sample, we can use the specific heat capacity of water which is 4.18 J/g°C.

The heat energy released by the carbohydrate sample can be calculated using the following equation:

Heat energy (J) = mass of water (g) × specific heat capacity of water × ΔTHeat energy

In this case, the calculation is as follows:

Heat energy (J) = 500 g x 8°C x 4.184 = 16,736 J

Therefore, burning a 1 gram carbohydrate sample raised the temperature of the 500 gram water bath by 8°C and released 16,736 J of heat energy.

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The physical process that is primarily responsible for the purification achieved during recrystallization is the process of selective solubility.

The process of selective solubility refers to the ability of a substance to selectively dissolve in a particular solvent or a combination of solvents. The substance that is more soluble in a solvent will dissolve in that solvent while the impurities that are less soluble will remain undissolved.

The process of recrystallization is used to purify a solid that contains impurities. In this process, a solid is dissolved in a solvent that is heated to the boiling point. Once the solution is saturated, it is cooled slowly, and crystals are allowed to form. During recrystallization, the impurities are excluded from the growing crystals because of their lower solubility in the solvent, and the crystals that form are pure.

Therefore, the process of selective solubility is primarily responsible for the purification achieved during recrystallization.

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Answer:

c.no is a correct answer