why is the hybridization model necessary to explain the bonding in a molecule such as ch4? select all that apply.

The three molecules you built, with the correct central atoms, have different bond angles.

The bond angles in a molecule are determined by the number of electron groups around the central atom. In a molecule with two electron groups, such as water (H₂O), the bond angle is about 104.5°.

In a molecule with three electron groups, such as ammonia (NH₃), the bond angle is about 107°. In a molecule with four electron groups, such as methane (CH₄), the bond angle is about 109.5°. These bond angles have such a relation because of the number of electron groups present.

In a molecule with two electron groups, the electron groups are more widely spaced and thus form a wider bond angle. As the number of electron groups increases, the electron groups are closer together, forming a bond angle that is closer to the central atom.

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It is given that an aqueous solution of iron(iii) bromide, FeBr3, contains 3.90 grams of iron(iii) bromide and 17.8 grams of water. The percentage by mass of iron(iii) bromide in the solution is 18.03%.

The mass of the solution = mass of iron(iii) bromide + mass of water = 3.90 g + 17.8 g= 21.70 g

The mass percentage of iron(iii) bromide in the solution is given by the mass percentage.

Thus, mass percentage = (mass of iron(iii) bromide/mass of the solution) × 100%= (3.90/21.70) × 100%= 18.03%

Therefore, the percentage by mass of iron(iii) bromide, FeBr3, in the solution is 18.03%.

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Answer: The percent ionization of 0.135 m lactic acid in a solution containing 0.0085 m sodium lactate is 10000%.

The percent ionization of 0.135 m lactic acid in a solution containing 0.0085 m sodium lactate is the ratio of the concentration of ionized lactic acid to the total concentration of lactic acid multiplied by 100.

The formula to calculate the percent ionization is:

% Ionization = [([Lactic Acid]i - [Sodium Lactate]) / [Lactic Acid]] × 100

Where [Lactic Acid]i is the concentration of ionized lactic acid and [Sodium Lactate] is the concentration of sodium lactate.

To solve for the percent ionization, we first need to calculate the concentration of ionized lactic acid. This can be done using the following formula:

[Lactic Acid]i = [Lactic Acid] + [Sodium Lactate]

We are given the concentrations of lactic acid and sodium lactate in the solution, so we can now calculate the concentration of ionized lactic acid:

[Lactic Acid]i = 0.135 + 0.0085 = 0.1435 M

Now that we have the concentration of ionized lactic acid, we can use the first formula to calculate the percent ionization:

% Ionization = [(0.1435 - 0.0085) / 0.135] × 100

% Ionization = (0.1350 / 0.135) × 100

% Ionization = 100 × 100

% Ionization = 10000%

To express the percent ionization to two significant figures, we round the answer to 10000% to 2 sig figs: 10000% ≈ 10000%. Therefore, the percent ionization of 0.135 m lactic acid in a solution containing 0.0085 m sodium lactate is 10000%.


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The anions, such as sulfate ([tex]SO_4^{2-}[/tex]), phosphate ([tex]PO_4^{3-}[/tex]), and nitrate ([tex]NO_3^-[/tex]), may be separated by anion-exchange liquid chromatography. This form of liquid chromatography is commonly used in the purification of proteins and nucleotides.

Anion-exchange chromatography separates anions on the basis of their charge and specificity to a particular resin. Anion-exchange chromatography separates ions by exchanging anions on a positively charged stationary phase with other anions in a solution of the sample of water.

Anion-exchange chromatography can be used to separate a wide range of anions in a single step, including organic acids and sulfur-containing compounds. Therefore, anion-exchange liquid chromatography is the most suited for separating sulfate ([tex]SO_4^{2-}[/tex]), phosphate ([tex]NO_3^-[/tex]), and nitrate ([tex]NO_3^-[/tex]) in a sample of water.

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By plugging in the values for each of the parameters and solving for t, the time required for 99.9% of the 2-chloro-2-methylpropane to hydrolyze can be determined.

The time required for 99.9% of the 2-chloro-2-methylpropane to hydrolyze at room temperature depends on the specific conditions of the reaction. Generally, it will take several hours for this reaction to occur.

To calculate the exact time required, we can use the Arrhenius equation, which is given as:

   k = A*e(-Ea/RT)

Where:

   k = rate constant for the reaction

   A = pre-exponential factor

   Ea = activation energy

   R = gas constant

   T = temperature

The values for each of the parameters and solving for t in the equation, the time required for 99.9% of the 2-chloro-2-methylpropane to hydrolyze can be determined.

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Answer:

yes because temperature is the moles of the initial respectively in the volume torr and 433 torr fixed the temperature heliums gas sample by 153 ml thank you

The molecular formula of a certain compound is x2O3. If 18.88 g of the compound contains 10 g of x, the atomic mass of x is approximately 54 g.

Let's assume that the number of atoms of X in the molecular formula is equal to 'a'.

Then, the molecular mass of the compound will be equal to:-

(a × atomic mass of X) + (2 × molar mass of O) = 2a(MX) + 3 × 16 = 2a(MX) + 48

The atomic mass of X can be determined by finding the value of a.

The molecular mass of the compound = 18.88 g/mol

Mass of X = 10 g

We can calculate the value of a by simplifying the equation:-

2a(MX) + 48 = 18.88MX = (18.88 - 48)/- 4aMX = 14/3a

Now, on substituting the values,

The atomic mass of X = (18.88 g/mol × [14/3a])/[2(14/3a) + 3 × 16]

On simplifying the above equation:-

The atomic mass of X = (9.44 × 3a)/[28a + 144] (The denominator can be simplified by factoring 4)

The atomic mass of X = (9.44 × 3a)/(4 × (7a + 36))= 2.4 g/mol

For the given question, the atomic mass of X is approximately 54 g, so the correct answer is option b.

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A 2.90 m solution of methanol (ch3oh) in water has a density of 0.984 g/ml has no mass percentage, The molarity of the solution is  0.000872 M and the mole percent of the solute in the solution is 0.0018%.

a) Mass percent

The mass percent of solute in the solution is the mass of the solute divided by the mass of the solution, then multiplied by 100. The mass percent of the solute in the given solution is computed below:

Mass of the solution = Volume of the solution × Density of the solution

= 2.90 L × 0.984 g/mL= 2.8476 g

Mass of the solute = Mass of the solution - Mass of water= 2.8476 g - (2.90 L × 1000 g/L) = -5.40 g

Mass percent = (mass of solute / mass of solution) × 100

= (-5.40 g / 2.8476 g) × 100= -189.89% (not possible)

Therefore, the mass percent of solute in the solution is not possible.

b) Molarity

The number of moles of solute present in the given solution is first calculated:

Molar mass of CH3OH = 12.01 + 3(1.01) + 16.00 = 32.04 g/mol

Mass of CH3OH in solution = Volume of solution × Density of solution × Mass percent of solute / 100

= 2.90 L × 0.984 g/mL × 2.89% / 100 = 0.0810 g

Moles of CH3OH in solution = mass of CH3OH / molar mass of CH3OH

= 0.0810 g / 32.04 g/mol= 0.00253 mol

Therefore, the molarity of the solution:

Molarity = Moles of solute / Volume of solution in liters

= 0.00253 mol / 2.90 L

=0.000872 M or 8.72 x 10^-4 Mc)

Therefore, the molarity of the solution is  0.000872 M or 8.72 x 10^-4 Mc)

c) Mole percent

The mole percent of the solute in the solution is computed as follows:

Mole fraction of solute = Moles of solute / Moles of solute + Moles of solvent

= 0.00253 / (0.00253 + 139.53)

= 0.000018 mole

Mole percent of solute = (mole fraction of solute × 100)

= (0.000018) × 100= 0.0018%

Therefore, the mole percent of the solute in the solution is 0.0018%.

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Answer : When mixing 538 grams of a substance into 647 ml of water, the concentration of the resulting solution in g/L is 0.83.

The concentration of the resulting solution in g/L can be calculated by dividing the mass of the substance (538 g) by the total volume of the solution (647 ml). This gives us a result of 0.83 g/L.

To further explain this calculation, we must first understand the concepts of mass and volume. Mass is a measure of the amount of matter an object contains. Volume, on the other hand, is the amount of space occupied by a given object. When mixing 538 grams of a substance into 647 ml of water, we are creating a solution with a certain concentration of the substance.

To calculate the concentration of the resulting solution, we must divide the mass of the substance (538 g) by the total volume of the solution (647 ml). This gives us a result of 0.83 g/L.

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1. We can see here that critical mass is important for a fission chain reaction because: C. It allow neutrons to be absorbed by other fissionable nuclei.

Fission chain reaction is a self-sustaining reaction in which the splitting of atomic nuclei of a particular material, such as uranium or plutonium, releases a large amount of energy in the form of heat and radiation.

2. A moderator is important for a fission chain reaction because: A. it keeps the neutrons from escaping the sample.

3. Enrichment is important for a fission chain reaction because: D.  it provides enough fuel to make enough energy.

A moderator is important for a fission chain reaction because it slows down the fast-moving neutrons, making them more likely to be absorbed by other fissionable nuclei and sustain the chain reaction. Without a moderator, the neutrons would move too quickly to be efficiently absorbed.

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Fully reacting an aldehyde with an alcohol will produce an acetal.

What is an acetal?

Acetal is a functional group consisting of two ether groups bonded to the same carbon atom. It's also called a 1,1-dialkoxyalkane.

Acetals are generated by the reaction of carbonyl compounds with alcohols under acidic or basic conditions.

Acetals can be used as protecting groups for carbonyls in organic synthesis. The carbonyl group is made less reactive by formation of the acetal, which shields it from further reaction.

Therefore, reaction with nucleophiles such as organolithium reagents or Grignard reagents is prevented.

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The statement is true about isotopes  is : Isotopes are the same element with different atomic masses. The statement is true about isotopes.

Isotopes are different forms of the same element that have the same number of protons in their nucleus but different numbers of neutrons.

This means they have the same atomic number but a different mass number. To find the isotopes of an element, look for the number of protons in the element's nucleus.

This number, also called the atomic number, is what identifies the element. The number of neutrons, on the other hand, can vary for different isotopes of the same element.

This is what gives each isotope a different mass number.To write an isotope, it is written in the form of element name-mass number.

For example, the isotopes of Carbon (C) are C-12, C-13, and C-14, which have 6, 7, and 8 neutrons, respectively. Isotopes are formed by natural processes such as radioactive decay or nuclear reactions.

They are also used in various applications like medical imaging, radiocarbon dating, and nuclear power generation.

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Answer:

ovulation

Explanation:

Ovulation is a phase in the menstrual cycle when your ovary releases an egg (ovum)

At the equivalence point of a titration between 24.6 mL of 0.389 M ethylamine, C2H5NH2, and 0.325 M hydroiodic acid, the pH is 0.

At the equivalence point of a titration between 24.6 mL of 0.389 M ethylamine, C2H5NH2, and 0.325 M hydroiodic acid, the pH is 0. The equation for the reaction is:

C2H5NH2 + HI → C2H5NH3+ + I-

The number of moles of hydroiodic acid, HI, needed to reach the equivalence point is equal to the number of moles of ethylamine, C2H5NH2. To calculate this, use the following equation:

Moles of HI = Moles of C2H5NH2

Volume of C2H5NH2 x Molarity of C2H5NH2 = Volume of HI x Molarity of HI

24.6 mL x 0.389 M = Volume of HI x 0.325 M

Volume of HI = 24.6 mL x 0.389 M / 0.325 M

Volume of HI = 30.53 mL

At the equivalence point, the pH of the solution is 0.

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We require 36.36 milliliters of the drug solution to provide 1 gram of the drug.  

A drug has a concentration of 275 mg per 10 ml. We have, volume of solution = mass of solute/concentration.

The mass of the solute (drug) is 1 gram or 1000 mg. Concentration is 275 mg/10 ml, which can be simplified to 27.5 mg/ml.

Volume of solution = mass of solute/concentration= 1000 mg/27.5 mg/ml= 36.36 ml. Therefore, we require 36.36 milliliters of the drug solution to provide 1 gram of the drug.  

We can determine the required volume of a solution if we know the concentration of the solute and the mass of the solute to be delivered by using the formula volume of solution = mass of solute/concentration.

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If you feel that your placement in English, Math, Reading, ESL and/or Chemistry is incorrect, then you should follow the steps below to resolve the issue:

Step 1: Review the Placement Criteria: The first step is to review the placement criteria for the subject. It will help you to understand the reasons behind your placement.

Step 2: Contact the Admissions Office: After reviewing the placement criteria, if you still believe that your placement is not correct, then you should contact the Admissions Office of your college or university. The Admissions Office will provide you with guidance on how to proceed.

Step 3: Submit Additional Documentation: In case you feel that your placement is incorrect, you can submit additional documentation, including test scores or academic records, to the Admissions Office.

Step 4: Appeal the Placement: If you disagree with the placement decision, you can file an appeal. You must provide reasons for the appeal, and it must be filed within a specified timeframe.

Step 5: Take a Placement Test: Finally, if you feel that your placement is not accurate, then you can take a placement test. The test will assess your skills and knowledge and provide you with a placement that is more accurate.

In conclusion, if you believe that your English, Math, Reading, ESL and/or Chemistry placement is incorrect, then you should follow the steps mentioned above. It is essential to take the necessary steps to ensure that you are placed in the correct level. The correct placement will help you to succeed in your academic journey.

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Answer:

The half-life of sodium-24 is approximately 12.1 hours.

Explanation:

The half-life of a radioactive isotope is the amount of time it takes for half of a sample to decay. We can use the following equation to calculate the half-life:

N = N0 * (1/2)^(t/T)

where N is the final amount, N0 is the initial amount, t is the time elapsed, and T is the half-life.

In this case, we know that the initial amount (N0) is 208 g, the final amount (N) is 13.0 g, and the time elapsed (t) is 60.0 hours. We can solve for the half-life (T) by rearranging the equation as follows:

T = t / log2(N0/N)

T = 60.0 hours / log2(208 g / 13.0 g)

T = 60.0 hours / 4.97

T = 12.1 hours

The specific heat capacity of the metal was determined to be 1,600 J/g°C

The specific heat capacity of a 50-gram piece of 1000°C metal is the amount of energy required to raise the temperature of the metal by 1°C.

In order to raise 400 grams of 200°C water to 220°C, it would take 80,000 joules of energy (400g x (220-200) x 4.18 J/g°C). Therefore, the metal must provide 80,000 J of energy to raise the temperature of the water.

In order to determine the specific heat capacity of the metal, we must divide the energy required to raise the temperature of the water by the mass of the metal and the temperature change.

Therefore, the specific heat capacity of the metal is 1,600 J/g°C (80,000/50g x (1000-800)°C).

Specific heat capacity is an important concept in thermodynamics, which describes the amount of energy needed to change the temperature of a substance.

It is a measure of a material's ability to store thermal energy, and it can be used to calculate the amount of energy required to raise or lower the temperature of a given mass of material.

In this example, the specific heat capacity of the metal was determined to be 1,600 J/g°C. This means that, for every gram of metal, 1,600 joules of energy are required to raise its temperature by 1°C.

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Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. One of these molecules contains polar bonds is H2O.

Polarity occurs when the electron pair of a bond is unevenly distributed between two atoms. A polar bond has a positive and negative end, unlike a nonpolar bond. The polarity of a bond can be determined by a difference in electronegativity between two atoms. Polar covalent bond is a type of covalent bond in which the atoms share electrons in an unequal manner.

Polar covalent bonds have a positive and a negative end. The positive end of the bond is that part of the bond that is less electronegative, whereas the negative end is that part of the bond that is more electronegative. The molecule that contains polar bonds is H2O (water), the bond between the oxygen atom and the hydrogen atoms in water is polar because the oxygen atom is more electronegative than the hydrogen atoms, causing the electrons to be drawn closer to the oxygen atom, creating a partial negative charge on the oxygen and a partial positive charge on the hydrogen atoms. As a result, water has a polarity.

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Answer: There are 2.41 * 102 molecules in 4.00 moles of glucose.

Explanation: Glucose is C6H12O6, and Avogadro's Number (named for Amadeo Carlo Avogadro 1776 – 1856) tells us that 1 mole contains 6.022 x 10^23 molecules. So, 4.0 moles contains 4 x 6.022 x 10^23 = 2.409 x 10^24 molecules.

The mass of metallic iron produced in the course of the reduction of 15.0 g of FeO with 3.0 g of Al is: 12.1 g.

To calculate this, we must consider the reaction that occurs:
FeO + Al → Fe + Al2O3

In this reaction, 1 mol of FeO reacts with 1 mol of Al to produce 1 mol of Fe and 1 mol of Al2O3. Since the given mass of FeO is 15.0 g and the given mass of Al is 3.0 g, we can calculate the number of moles of each reactant with the following equation:  n (reactant) = mass (reactant) ÷ molar mass (reactant)

[tex]n (FeO) = 15.0 g ÷ 71.84 g/mol = 0.2092 mol[/tex]
[tex]n (Al) = 3.0 g ÷ 26.98 g/mol = 0.1115 mol[/tex]

Therefore, since 0.2092 mol of FeO reacts with 0.1115 mol of Al, 0.2092 mol of Fe is produced. We can then calculate the mass of Fe produced with the following equation:

mass (Fe) = n (Fe) × molar mass (Fe)
mass (Fe) = 0.2092 mol × 55.85 g/mol = 11.6 g

Therefore, the mass of metallic iron produced in the course of the reduction of 15.0 g of FeO with 3.0 g of Al is 11.6 g.

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The entropy of the system is increasing. The reason for this is that entropy is a measure of disorder, and as the temperature of the room rises, the ice will begin to melt, which increases the disorder of the system.

The melting of the ice results in an increase in entropy because the solid ice has a lower entropy than the liquid water.

The melting of the ice results in an increase in entropy because the solid ice has a lower entropy than the liquid water. As the ice melts, its molecules become more disordered, and the system's entropy increases.

This increase in entropy is due to the change in the state of the system from a solid to a liquid.

Entropy is a measure of the disorder or randomness of a system. When ice is exposed to a temperature above 0°C, it begins to melt, which increases the disorder or randomness of the system.

The process of melting involves the breaking of the crystal structure of ice into random liquid water molecules. As a result, the entropy of the system increases.

Another way to look at it is that the melting of the ice results in an increase in the number of ways in which the water molecules can be arranged.

In the solid state, the water molecules are arranged in a rigid crystal lattice, which limits the number of ways in which they can be arranged.

In the liquid state, the water molecules are free to move and arrange themselves in a much greater number of ways, resulting in an increase in entropy.

The entropy of the system increases when ice is exposed to a temperature above 0°C because the melting of the ice results in an increase in the disorder or randomness of the system.

This increase in entropy is due to the change in the state of the system from a solid to a liquid, which results in an increase in the number of ways in which the water molecules can be arranged.

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Acetate, the conjugate base of acetic acid, and hypochlorite, the conjugate base of hypochlorous acid, will have equal amounts.

For instance, the conjugate base of the weak acid acetic acid is the acetate ion. In order to create unionized acetic acid and the hydroxide ion, a soluble acetate salt, such as sodium acetate, will release acetate ions into the solution.

Acetic acid and hypochlorous acid will react when combined to produce their conjugate bases:

CH3COOH + HOCl ↔ CH3COO- + HClO

This reaction's equilibrium constant can be written as:

K = [CH3COO-][HClO] / [CH3COOH][HOCl]

[CH3COO-] = [CH3COOH] = 1.0 M

[HClO] = [HOCl] = 1.0 M

By entering these values as replacements in the equilibrium formula, we obtain:

K = (1.0 M) / (1.0 M)

= 1.0

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The pH at the start of the titration, before any barium hydroxide has been added, is 5.88.

Hydrocyanic acid (HCN) is a weak acid, so we can use the equation for the ionization of HCN in water to calculate the pH of the solution:

HCN + H2O ⇌ H3O+ + CN-

The acid dissociation constant (Ka) for HCN is 4.9 x 10^-10. At the start of the titration, before any barium hydroxide has been added, the solution contains only HCN and water. We can use the initial concentration of HCN and the Ka value to calculate the initial concentration of H3O+:

Ka = [H3O+][CN-] / [HCN]

[H3O+] = √(Ka x [HCN]) = √(4.9 x 10^-10 x 0.334) = 1.32 x 10^-6 M

The pH of the solution can be calculated using the equation:

pH = -log[H3O+]

pH = -log(1.32 x 10^-6) = 5.88

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NH2 is the conjugate base of NH3.

The formula for the conjugate base is the formula for the acid minus one hydrogen. The reacting base transforms into its conjugate acid. The conjugate acid's formula is the base's formula plus one hydrogen ion.

Because it accepts a proton from acid to create the conjugate acid, NH3 is a weak base, as seen in the reaction that follows. A weak base thus produces a strong conjugate acid, proving that it is a strong base. According to this notion, NH3 is a weak base since NH4+ is a strong conjugate acid.

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Acid rain effects are detrimental to the environment. The most common method to neutralize acid rain is Lime Neutralization. When the pH level decreases, Acid rain becomes too acidic, and it can have an adverse effect on the environment

The acid rain causes the water to become too acidic and the pH level decreases. It is very harmful to plants and wildlife. It damages buildings and monuments and also affects the water bodies. It affects the aquatic life, and the creatures living in it. It is essential to prevent this from happening.

Several methods can be used to neutralize acid rain. They are as follows:

Lime neutralization: It is one of the most common methods to neutralize acid rain. It is a process in which lime is added to the water body to neutralize the acid content.

Buffering: The buffering capacity is used to treat the water. Buffering capacity is the ability of the water to neutralize acid. The water with a higher buffering capacity will neutralize more acid than the water with less buffering capacity.

Gas scrubbing: It is a process in which the smokestacks from factories and other industries are fitted with scrubbers. These scrubbers help in trapping the pollutants that are released into the atmosphere.

The pH level change plays a significant role in acid rain. When the pH level decreases, it becomes too acidic, and it can have an adverse effect on the environment. It can cause the aquatic life to die, and it can damage the buildings and monuments. It is crucial to control the pH level to prevent such damage. The pH level of 7 is considered neutral. The pH level lower than 7 is acidic, and higher than 7 is alkaline. Hence, it is essential to control the pH level to prevent damage from acid rain.

Thus, Acid rain effects are detrimental to the environment. And it is very important to prevent and control the pH level to prevent damage from acid rain.

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The relationship between intermolecular forces of attraction and the solubility of a compound in a solvent is that the stronger the intermolecular forces of attraction, the greater the solubility in a given solvent.

Intermolecular forces are forces of attraction that exist between molecules, which allow them to interact and combine in various ways. The strength of intermolecular forces has a significant impact on a substance's properties, such as boiling and melting points, as well as its solubility in various solvents.

When two substances with different intermolecular forces are mixed together, the weaker substance is typically dissolved by the stronger one. Polar solvents, for example, can dissolve polar solutes because the forces between the molecules are comparable.The polar water molecules will surround and dissolve other polar molecules, such as sodium chloride or table salt, because they are attracted to the polar charges on the molecule. When nonpolar solvents, such as hexane, are added to a polar compound, it is the opposite. The polar compound would not dissolve because the intermolecular forces are not compatible.

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Answer:

1. Date of birth.

2. Social security numbers.

3. Phone numbers.

4. Credit card details.

5. Home address.

6. Password information (or what they need to reset your password)

Explanation: They ask for any of the identification things you have.