Answer: penlalalalaooooaaaaaaaaaaa
Explanation: pen
Determine the density of a liquid if a 35.2 mL sample has a mass of 28.548 g.
The density of the liquid is 0.79.
Density can be determined by the ratio of mass and volume of a particular substance. It can be denoted by the symbol d. The concept of density is crucial because it enables us to predict which compounds will float and which ones will sink in a liquid. As long as an object's density is lower than that of the liquid's density, it will often float.
Density can be determined by the formula:
Density = mass / volume.
Given data:
Volume = 35.20mL
Mass = 28.54 g
Put the values of given data in above formula:
Density = 28.20 / 35.54
Density = 0.79 m³
Therefore, the density of the liquid will be 0.79.
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The density of a liquid if a 35.2 mL sample has a mass of 28.548 g is 0.811 g/mL.
What is density?
Density is defined as the mass of the substance per unit of volume. It can be understood by the mass of a substance divided by its volume. Density is denoted using symbol ρ. Density of a liquid can be calculated by -
ρ = m
v
where,
ρ = density
m = mass
v = volume
Density is a physical property of a matter. Higher the density of a substance, higher will be its mass and volume. As long as an object's density is lower than that of the liquid's density, it will often float.
To calculate density of given liquid -
we have,
mass = 28.548 g
volume = 35.2 mL
Using the formula,
Density = mass
volume
ρ = 28.548
35.2
ρ = 0.811 g/mL
Therefore, density of liquid is 0.811 g/mL or m³
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An ion has a mass number of 65, 36 neutrons, and a charge of 1 . identify the element symbol, and determine the number of protons and electrons in this ion.
The ion with a mass number of 65, with 36 neutrons and a charge of +1 is Copper (Cu). It has 29 protons and 28 electrons.
An ion is a charged particle formed when an atom loses or gains electrons. When electrons are lost, a negatively charged anion is formed, electrons are gained. a positively charged cation is formed.
The ion in the question has a mass number of 65. This means that the total number of protons and neutrons is 65. To get the number of protons, we subtract the number of neutrons from the mass number. That will give us 29 protons.
From the number of protons, we can identify the element symbol. The number of protons equal to the atomic number. Hence, the ion has an atomic number of 29. On the periodic table, the element with an atomic number of 29 is Copper (Cu). It also has a charge of +1, meaning that it has given out one electron. Therefore, it will have 28 electrons instead of 29.
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What byproduct of fermentation creates the characteristic holes in swiss cheese? select one:
a. carbon dioxide
b. lactic acid
c. ethyl alcohol
d. acetic acid
The byproduct of fermentation that creates the characteristic holes in swiss cheese is a. carbon dioxide.
Swiss cheese is a cheese made in Switzerland.
Swiss cheese is, usually, a semihard cheese made from cows milk with a characteristic holes.
Fermentation of milk is a metabolic process in which lactic acid and carbon dioxide are produced from sugar lactose:
C₆H₁₂O₆ → CH₃CHOHCOOH + C₂H₅OH + CO₂
Carbon dioxide (CO₂) is a gas. It gets stuck in swiss cheese and it makes bubbles, which make holes.
Fermentation is a way of extracting energy from molecules and it is the oldest metabolic pathway.
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A 6 kg box is pushed across the floor with a force of 72N. Calculate the acceleration of the object.
The acceleration of the object is 12 m/s².
What is Acceleration?The rate at which velocity changes over time in terms of both speed and direction is known as acceleration. An object is considered to have been accelerated if its velocity changes. Depending on whether an object is moving faster, slower, or in a different direction, its velocity may change. Acceleration is a vector quantity since it has both a magnitude and a direction.The SI unit of acceleration is m/s².Given:
Force = 72N
Mass = 6 kg
To calculate acceleration apply the formula,
Acceleration = Force/mass
= 72N / 6kg
= 12 m/s²
Therefore, the acceleration of the object is 12 m/s².
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Define the term buffering region and describe how you could locate the buffering region on a titration curve.
A weak acid and its conjugate base are typically present in a buffer solution. When H+ is added to a buffer, the conjugate base of the weak acid accepts a proton (H+), “absorbing” the H+ before the pH of the solution drops significantly. The buffering region is approximately 1 pH unit on either side of the conjugate acid’s pKa. The buffering region’s midpoint occurs when one-half of the acid reacts to dissociation
A titration curve graphically depicts buffer capacity. The middle of the curve is flat because the addition of base or acid has little effect on the pH of the solution. This is known as the buffer zone. When a small amount of acid or base is added to the buffer system.
This portion of the titration curve corresponds to the buffer region: it exhibits the smallest change in pH per increment of an added strong base.
The acid-base properties of the solution are dominated by the equilibrium for dissociation of the weak acid, corresponding to Ka, in the region of the titration curve at the lower left, before the midpoint. The acid-base properties of the solution are dominated by the equilibrium for the reaction of the conjugate base of the weak acid with water, corresponding to Kb, in the region of the titration curve at the upper right, after the midpoint. However, because Ka and Kb are related by Kw, we can calculate one from the other.
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What two dimensions, in addition to mass, are commonly used by physicists to derive additional measurements? length and width area and mass length and time velocity and time
In addition to mass, physicists' two commonly used dimensions to derive additional measurements are length and time.
The SI system's fundamental units are those of the basic physical quantities that are not created from other units. There are seven fundamental units, including the meter, kilogram, ampere, and second. Derived units are those which are calculated and expressed with the help of above mentioned fundamental quantities.
The dimensional formula of any quantity is the expression that specifies the powers to which the fundamental units should be raised in order to obtain one unit of a derived quantity. It is written as [M^aL^bT^x] where a, b, and x are the power to which the fundamental quantity is raised.
Therefore the additional two dimensions used by the physicists to derive additional measurements are length and time.
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what is meaning of product and reactant
Answer:
Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation.
Does a reaction occur when aqueous solutions of manganese(ii) sulfate and chromium(ii) nitrate are combined?
manganese(ii) sulfate and chromium(ii) nitrate precipitation reaction takes place.
Manganese(II) sulfate MnSO₄ and chromium nitrate Cr(NO₃)₂ are both water-soluble ionic compounds. When mixed in solution, the following constituent ions are formed:
Mn2+, Cr2+ NO
Possessing relatively good water solubility, manganese(II) nitrate remains dissolved in solution. . However, calcium sulfate is insoluble and common to most ionic compounds that bind Group 2A metal cations and sulfate anions. Therefore, a precipitation reaction takes place. The balanced molecular reaction equation is:
MnSO₄(aq) + Cr(NO₃)₂(aq) → CrSO₄
The ionic formula describes all strong electrolyte species in terms of fully dissociated ionic components.
Mn2+(aq) + SO2(aq) + Cr₂+(aq) + 2N
The net ion equation excludes manganese (II) and nitrate spectator ions.
Dissolution completely dissociates both reactant compounds into their constituent ions, allowing these ions to pair to form two new ionic compound products. A key feature is that one of these products is relatively insoluble in water, which can usually be predicted without calculation. The net ion equation for the precipitation reaction system focuses on the formation of this solid insoluble product so that all spectator ions are removed.
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A mixture with h2 and he exerts a total pressure of 0.480 atm. if there is 1.00 g of h2 and 1.00 g of he in the mixture, what is the partial pressure of the helium gas?
The partial pressure of helium (He) in the mixture containing 1 g of H₂ and 1 g of He is 0.16 atm
What is Partial pressure?
Partial pressure can be explained if each specific gas contributes a part of the total pressure and that part is the partial pressure of that gas.
At first to find Mole For H₂:
Mass of H₂ = 1 g
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mole of H₂ =?
Mole = mass / molar mass
Mole of H₂ = 1/2
Mole of H₂ = 0.5 mole
To find the mole For He:
Mass of He = 1 g
Molar mass of He = 4 g/mol
Mole of He =?
As we know, Mole = mass / molar mass
Mole of He = 1/4
Mole of He = 0.25 mole
Total Mole = Mole of Hydrogen+ Helium
Total mole = 0.5 + 0.25
Total mole = 0.75 mole
Next, we shall determine the mole fraction of He.
Mole fraction = mole / total mole
Mole of He = 0.25 mole
Total mole = 0.75 mole
Mole fraction of He = 0.25 / 0.75
Mole fraction of He = 0.33
To determine the partial pressure of He.
Partial pressure = mole fraction × total pressure
Mole fraction of He = 0.33
Total pressure = 0.48 atm
Partial pressure of He = 0.33 × 0.48
Partial pressure of He = 0.16 atm
Therefore, the partial pressure of helium (He) in the mixture is 0.16 atm
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Why is the Heisenberg uncertainty principle true at the atomic level?
The Heisenberg uncertainty principle is true at the atomic level because we cannot simultaneously determine the accuracy of both velocity and the position of a particle.
What is the Heisenberg uncertainty principle?Heisenberg's Uncertainty Principle states that there is inherent uncertainty in the act of measuring a variable of a particle.
The Heisenberg uncertainty principle was found to be contrary to classical Newtonian physics which stipulates that all variables of particles to be measurable to an arbitrary uncertainty given standard equipment.
The Heisenberg uncertainty principle is true at the atomic level because we cannot simultaneously determine the accuracy of both velocity and the position of a particle.
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Three samples of sodium chloride are analyzed and found to contain differing percent by mass of chlorine. what does this information alone, tell us about the three samples?
Three samples of sodium chloride are analyzed and found to contain differing percent by mass of chlorine this indicates that only one solution has actual content of chlorine.
There may be differential volume of chlorine in sodium chloride solution in Nacl the mass percent of chlorine should be 60.8%.
With respect to 1 mole sodium chloride,
Mass of sodium in sodium chloride =23 g
Mass of chloride in sodium chloride =35.5 g
Total mass of sodium chloride =58.5 g
% of chlorine in NaCl =
58.5/35.5×100 = 60.85
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Calculate the ph of a mixture of 0.25 m acetic acid (ch3cooh) and 0.1 m sodium acetate (ch3coo- na ) in a total volume of 1 l. the pka of acetic acid is 4.76.
The pH of a mixture of 0.25 m acetic acid (CH3COOH) and 0.1 m sodium acetate (CH3COO- Na ) in a total volume of 1 l is 4.37.
The above situation represents a case of buffer solution.
Buffer solutions are those solutions that can resist change in their pH if any acid or base is added to them.
To calculate the pH of a buffer solution, the Henderson-Hasselbalch equation is used
pH = pKa + log [Salt]/[Acid]
Putting
pKa = 4.76
[Salt] = Concentration of sodium acetate = 0.1 M
[Acid] = Concentration of acetic acid = 0.25 M
pH = 4.76 + log [0.1]/[0.25]
pH = 4.76 + log[0.4]
pH = 4.76 - 0.39
pH = 4.37
Hence, the pH of a mixture of 0.25 m acetic acid (ch3cooh) and 0.1 m sodium acetate (ch3coo- na ) in a total volume of 1 l is 4.37.
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When compounding a sterile product, you should keep all supplies and manipulations at least ________ from all walls (including the filter) and the front edge of the hood.
When compounding a sterile product, you should keep all supplies and manipulations at least 6 inches within the hood from all walls (including the filter) and the front edge of the hood.
What does a sterile compounding room mean?
A well-lit buffer space, an ante area, a storage area for sterile supplies and products, and both are secondary engineering controls are all included in the sterile compounding area. An space where a PEC is situated and where operations like preparation, compounding, and staging of CSPs take place is referred to as a buffer area (or "cleanroom").
When preparing a sterile product, you must keep all materials and operations at least 6 inches away from the hood's front edge, all walls (including the filter), and all manipulations.
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5g of copper(II)sulphate crystals are dissolved in water to form aqueous copper(II)sulphate solution. All the solution is then reacted with a 1.5 mol/dm³ of sodium hydroxide solution. A blue precipitate (solid) of copper(II)hydroxide was formed along with a colorless solution, sodium sulphate.
CuSO4 (aq)+ 2NaOH (aq) → Cu(OH)2 (s) + Na₂SO4 (aq)
1. Calculate the mass of the precipitate, Cu(OH)2 formed.
2. Calculate the volume of NaOH needed to react with 5 g of copper(II)sulphate.
3. Calculate the concentration (in mol/dm³) of sodium sulphate when 20 cm³ was formed.
A calorimeter initially contains 165.0 ml of water at 21.3oc. when 2.72 g k is added to the water, the temperature of the resulting solution rises to a maximum of 47.8oc. the reaction that occurs is:________
The reaction that occurs is:
2K (s)+H2O (l)→2KOH (aq)+H2 (g)
What is the Principle of Calorimeter?Two different types of matter—ideally a liquid and a solid—are in touch with one another in a calorimeter. Both bodies also have different temperatures. This configuration allows heat energy to move from an object with a higher temperature to an object with a lower temperature. Heat transfer does not stop, nevertheless, until there is a state of thermal equilibrium between the bodies. The "rule of conservation of energy," which is represented by the principle of calorimetry, states that the total amount of heat absorbed by the cold object and the total amount of heat released by the hot object are equal.To learn more about Calorimeter refer to:
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A compound consists of three times as many moles of chlorine as unknown metal m. Metal m contains 23 electrons and 31 neutrons when it forms this compound. What is the mass number of m?.
Answer:
57
Explanation:
The element iodine appears in
Period 5 of the Periodic Table. This
means that an iodine atom has-
A five electrons in its outer orbital
B five orbitals in its electron cloud
C an atomic mass greater than four
D five protons and five neutrons in its nucleus
The element iodine appears in Period 5 of the Periodic Table. This means that an iodine atom has five orbitals in its electron cloud. so the correct option is (b).
As a member of group 7, iodine possesses seven outer electrons. Since it is in the fifth period, its electrons will be in orbitals 5s and 5p. The chemical formula for iodine is 5s25px25py25pz1.
What does iodine's orbital notation mean?total amount of electrons that could occupy each orbital
Again using iodine as an example, we can observe on the periodic table that it has an atomic number of 53. ( In neutral state it contains 53 electrons). The configuration of the entire electron cloud is 1s22s22p63s23p64s23d104p65s24d105p5.
Facts about Iodine:Iodine is a trace element that can be found as a dietary supplement, as well as naturally in some foods and some forms of salt. Iodine is a necessary component of the thyroid hormones triiodothyronine (T3) and thyroxine (T4) (T3).
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An atom has a mass of 44 and 21 electrons. Fill in the chart given this information.
Assuming that the atom has a neutral charge:
The number of protons is equal to the number of electrons.
The number of neutrons is the mass subtracted by the number of protons.
The atomic number is the same as the number of protons.
Answer:
Protons = 21
Neutrons = 23
Atomic # = 21
What is the iupac name of the following compound . vinylcyclohexane b. ethynylcyclohexane c. allylcyclohexane d. acetylcyclohexane
IUPAC name of vinylcyclohexane is vinylcyclohexane, ethynylcyclohexane is 1-ethynylcyclohexane, allylcyclohexane is prop-2-enylcyclohexane and of acetylcyclohexane is 1-Cyclohexylethan-1-one.
IUPAC stands for International Union of Pure and Applied Chemistry. It is the universally-recognized authority on chemical nomenclature. It is based on naming the molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.
It creates a standardized way to name chemical compounds. The use of Common names can lead to confusion and misinformation.
IUPAC name of vinylcyclohexane is 1-ethenylcyclohexane.
IUPAC name of ethynylcyclohexane is 1-ethynylcyclohexane.
IUPAC name of allylcyclohexane is prop-2-enylcyclohexane.
IUPAC name of acetylcyclohexane is 1-Cyclohexylethan-1-one.
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Consider a sealed 1 litre container which holds room air at standard atmospheric pressure. if the container is compressed to a volume of 0.5 litres, what would be the partial pressure of oxygen (po2)?
Partial pressure = total pressure * volume of gas.
Partial pressure of oxygen (po2) = 1*0.5 = 0.5 atm L
what is partial pressure?
According to Dalton's Law of Partial Pressure, the total pressure of a gas mixture is equal to the sum of the partial pressures of all the constituent gases that make up the mixture. Dalton's Law of Partial Pressure has a straightforward equation.
It claims that the overall pressure exerted by the combination of non-reactive gases is equal to the sum of the partial pressures of the various gases. The pressure applied by each individual gas in a gas mixture is referred to as partial pressure.
Partial pressure = total pressure * volume of gas.
Thus, given here,
volume = 0.5 l
Pressure = 1 atm at STP
Therefore, partial pressure of oxygen = 1*0.5 = 0.5 atm L
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F this car's gas tank holds 45 l , how many tanks of gas will you use to drive 1600 km ?
1.52 tanks of gas will be used to drive 1600 km.
A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon).
A gallon is a unit of volume in both the US customary and imperial systems of measurement. The US gallon is defined as 231 cubic inches (3.785 liters).
1 mpg = 0.425143707 km/l; to convert miles per gallon to kilometers per liter .
mileage = 23.38 km/l
volume = 1600 km ÷ 23.38 km/l
volume = 68.43 liters; the amount of gasoline needed the trip
tanks = 68.43 l ÷ 45 l
tanks = 1.52
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why does oil not dissolve in water?
Answer:
the oil won't disolve in water because the oils resistance keeps it from not deforming
Answer:
Water and oil are incompatible. They are said to be inseparable. This is because water is a polar molecule, which means it has a positive charge on one end and a negative charge on the other.
Explanation:
Which reaction pathways shows the effect a catalyst (black) might have on an uncatalyzed reaction (gray)?
Option D) is the correct option. The role of the catalyst is to provide a new pathway for the reaction to take place which has lower activation energy.
The function of the catalyst is to change the rate of reaction without interfering with the reaction itself or without getting consumed in the reaction itself.
Catalyst only affects the activation energy of the reaction and does not change the enthalpy difference of the reaction. In other words, the final and initial energy of the product and reactant respectively remains the same even in presence of the catalyst.
In options C) and B) the final and initial energy of the reaction is different for both pathways, hence these are incorrect.
In option A) the activation energy of the uncatalyzed reaction is less than the catalyzed one which is not possible.
Therefore Option D) is the correct reaction pathway showing the effect of catalyst on an uncatalyzed reaction.
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Your question was incomplete. Please check below the full content
What is the atomic mass of one mole of Na?
_____ g/mole
Answer:
23g/mole
Explanation:
And whereas one sodium atom has an approximate mass of 23 u, 1 mol of Na atoms has an approximate mass of 23 grams. One mole of a substance has the same mass in grams that one atom or molecule has in atomic mass units.
Okkkkk I will give you 100 points and a brainliest if you please answer this question soon
Apply Graph mass versus volume for the data given
in the table. What is the slope of the line?
Answer:
y= .31120332x
How can blast help you identify the active site of your poi? make sure to include 2 advantages and 2 disadvantages of the program
Biochemical sequences that are similar to one another are found via BLAST. The application calculates the statistical significance by comparing nucleotide or protein sequences to sequence databases.
The Basic Local Alignment Search Tool (BLAST) identifies areas where sequences are locally similar. The software computes the statistical importance of matches between nucleotide or protein sequences and sequence databases.Advantages
1) Creating phylogeny
Using the BLAST web page, you can build a phylogenetic tree using the findings from the program. Only "first pass" phylogenetic analyses should use phylogenies based solely on BLAST as they are less reliable than other purpose-built computational phylogenetic methods.2) DNA analysis
BLAST can compare the chromosomal site of an interest sequence to pertinent sequences in the database while working with a known species and trying to sequence a gene at an unknown location (s). For this purpose, NCBI has a "Magic-BLAST" program based on BLAST.Disadvantages
1) You require repeatable, unbiased outcomes.
Because NCBI BLAST is a heuristic algorithm and uses a complex statistical model to determine whether a match is significant or not, it does not disclose all alignments it discovers. This choice is made based on the length of the alignment and the size of the database; if the database expands, it's possible that earlier findings will no longer be valid.2) Finding small sequences can be challenging
NCBI BLAST makes it more difficult by using algorithm shortcuts. The most crucial aspect of this heuristic is its word size parameter, which demands a continuous interval of three similar amino acids or eleven identical nucleotides before even attempting to align two sequences. Because of this, it is not the best option for finding brief sequences.In addition to assisting in the identification of gene family members, BLAST can be used to infer functional and evolutionary links between sequences.
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A buffer consists of c5h5nc5h5n (pyridine) and c5h6n c5h6n . write the equation for the reaction that occurs when strong acid (h3o )(h3o ) is added to the buffer.
The balanced chemical equation for the reaction that occurs when strong acid H₃O⁺ is added to the buffer:
C₅H₅N + H₃O⁺ → C₅H₅NH⁺ + H₂O
A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
This buffer is example of weak acid (C₅H₅NH⁺) and its conjugate base (C₅H₅N).
C₅H₅NH⁺ gain protons from strong acid H₃O⁺.
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What is the identity of a 100. 0 g sample of metal that, upon absorbing 4680 j of heat, increases in temperature by 52. 0 °c?.
Aluminum is a metal whose temperature rises by 52.0 °C when it absorbs 4680 J of heat in a 100 g sample. It has low density, non-toxicity, high thermal conductivity, good corrosion resistance.
The unknown metal has a mass (m) of 100.g and absorbs 4680 J of heat (Q) resulting in a temperature rise of 52.0 °C (ΔT).
It has low density, non-toxicity, high thermal conductivity, good corrosion resistance, and can be quickly cast, machined, and formed. Non-magnetic and non-flammable. It is the second most malleable metal and the sixth most malleable metal.
Aluminum is a metal with a specific heat capacity of 0.900 J/g.°C.
Specific heat, the amount of heat required to raise 1 gram of a substance by 1 degree Celsius. The units for specific heat are usually calories or joules/grams/Celsius.
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What happens if some ethyl alcohol of density 790 kg/m3 is poured into the container after the ice cube has melted?
The layer of ethyl alcohol forms on the surface if some ethyl alcohol is poured into the container after the ice cube has melted.
The density of a substance is its mass per unit volume.
The SI derived unit for density is the kilogram/cubic meter, but chemist usually use gram per cubic centimeter.
Ethyl alcohol has lower density of water, so it would form on the surface.
The density of the water is an around 1000 kg/m³.
Mass is a fundamental measure of the amount of matter in the object.
Volume is the amount of space that a substance occupies.
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What is the dominant intermolecular force that determines the solubility of the amine hydrochloride salt of ethyl 4-aminobenzoate in water?.
The major intermolecular force that governs how soluble ethyl 4-benzoate's amine hydrochloride salt is in water is ion-dipole. In conclusion, (b) is the correct response.
Since water is polar and the amino hydrochloride salt of ethyl amino benzoate will be ionic, ion-dipole will be the predominant intermolecular force.
The electromagnetic forces between molecules of attraction or repulsion that operate between atoms and other types of nearby particles, such as atoms or ions, are examples of intermolecular forces (IMFs), also known as secondary forces.
The strongest intermolecular forces are ion-dipole forces. A powerful dipole-dipole interaction of a hydrogen atom and an extremely electronegative atom, like oxygen, nitrogen or fluorine is known as a hydrogen bond.
The complete question is:
What is the dominant intermolecular force that determines the solubility of the amine hydrochloride salt of ethyl 4-aminobenzoate in water?
a) ion-ion
b) ion-dipole
c) London dispersion
d) hydrogen bonding
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