if a carbon atom is 135 pm wide, how fast must an electron be traveling in order to resolve a single carbon atom?

The gas causing the distinct "rotten egg" odor in many water sources is hydrogen sulfide (H2S).

Hydrogen sulfide (H2S) is a colorless gas with a distinct, unpleasant odor that is often described as smelling like rotten eggs. It is produced by the natural decomposition of organic matter, such as in swamps, sewage treatment plants, and manure pits. It is also produced by some industrial processes, such as petroleum refining and paper production.

Hydrogen sulfide is highly toxic, even at low concentrations, and can cause a range of health effects, including headaches, dizziness, nausea, and even death at high concentrations. It is also flammable and can form explosive mixtures with air.

In water sources, hydrogen sulfide can occur naturally or as a result of human activity, such as mining or drilling. It is often found in well water and can cause water to have a foul taste and smell. The presence of hydrogen sulfide in water can also cause corrosion of plumbing fixtures and appliances, as well as staining of clothing and other materials.

Hydrogen sulfide can be removed from water using a variety of methods, including aeration, oxidation, and chemical treatment. Aeration involves exposing the water to air, which allows the hydrogen sulfide gas to escape into the atmosphere. Oxidation involves adding an oxidizing agent, such as chlorine or hydrogen peroxide, to the water to convert the hydrogen sulfide gas to sulfate. Chemical treatment involves adding chemicals such as iron salts or activated carbon to the water to remove the hydrogen sulfide.

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You should use a pencil instead of a pen when marking on a thin layer chromatography plate because the components of pen ink will separate along with your sample, while pencil lead will not. So, the correct answer is b.

Using a pen to mark on a thin layer chromatography plate can cause the ink components to mix with the sample components, making it difficult to accurately analyze the separation of the components. Pencil lead, on the other hand, is inert and will not interfere with the separation process.

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The device that serves the same function as the packing is mechanical seal . Option (c) is correct.

Packing is the most common form of sealing used in controlling devices. A mechanical seal is considered as a method in which fluid is contained in a vessel for example: pumps and mixers, where one rotating shaft passes through one stationary housing. Mechanical seal is of comparatively low cost. These kind of seals lasts longer than packing.

Therefore, mechanical seals are generally preferred over the commonly used traditional packing seals in applications which controls or prevents leakage problems .Some other advantages of  mechanical seals are that these seals are more durable and they use multiple sealing points in order to eliminate any kind of  leakage.

Thus, the correct option is (c)

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The Bradford assay, we typically use Coomassie Brilliant Blue dye to detect and quantify protein concentration in a sample. This dye binds to amino acid residues in proteins and results in a color change that can be measured spectrophotometrically.

 The Bradford assay, the dye used is called Coomassie Brilliant Blue G-250. This dye interacts with proteins, allowing for the quantification of protein concentrations in a sample. The absorbance of the resulting protein-dye complex can be measured to determine the protein concentration based on a standard curve.The Bradford assay is based on the use of the dye Coomassie Brilliant Blue G-250, which is frequently abbreviated as Coomassie G-250 or Coomassie Blue. This is one of two Coomassie dyes that are often confused.

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Answer:

C

Explanation:

In the process of esterification, there are certain IR (infrared) spectral characteristics that can be used to compare the starting materials with the products. One of the most prominent features of the IR spectrum is the carbonyl peak, which is typically found at around 1700 cm-1 for esters.

In the starting materials, this peak will not be present, but it will appear in the IR spectrum of the products, indicating the formation of an ester bond. Another important feature of the IR spectrum that can be used for comparison is the C-O stretch, which is typically found at around 1200-1300 cm-1 for esters. Again, this peak will be absent in the starting materials but will appear in the products.

Other peaks that can be used for comparison include the C-H stretches, which are typically found at around 2800-3000 cm-1 for alkanes, and the O-H stretch, which is typically found at around 3400 cm-1 for carboxylic acids. These peaks will be present in the starting materials but will not appear in the products. Overall, a comparison of the IR spectra of the starting materials and products in esterification can provide valuable information about the formation of ester bonds and the presence or absence of certain functional groups.

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The quantity of moles of a solute that are dissolved in a volume is known as molarity, often referred to as molar concentration. 19.64 grams of potassium hydroxide must be added before the container is filled to its final volume

To calculate the number of grams of potassium hydroxide needed to make a 0.8750 m solution with a final volume of 400.0 ml, we first need to determine the number of moles of potassium hydroxide required.
Molarity (M) is defined as moles of solute per liter of solution. Since we know the final volume is 400.0 ml (or 0.4000 L), we can calculate the number of moles of potassium hydroxide needed as follows:
0.8750 mol/L x 0.4000 L = 0.3500 moles of potassium hydroxide
Next, we need to convert moles of potassium hydroxide to grams. The molar mass of potassium hydroxide (KOH) is:
K (39.10 g/mol) + O (16.00 g/mol) + H (1.01 g/mol) = 56.11 g/mol
Therefore, the number of grams of potassium hydroxide needed can be calculated as follows:
0.3500 moles x 56.11 g/mol = 19.64 grams of potassium hydroxide
So, the researcher needs to add 19.64 grams of potassium hydroxide to the container before it is filled to its final volume of 400.0 ml to make a 0.8750 m solution.

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The pH scale is a logarithmic scale that measures the concentration of hydrogen ions in a solution. A decrease in one unit of pH corresponds to a ten-fold increase in the concentration of hydrogen ions. Therefore, a solution of pH 4 has 10 times more hydrogen ions than a solution of pH 5.

To answer the question, we can calculate the ratio of hydrogen ion concentrations between the two solutions:

Ratio of hydrogen ion concentrations = 10^(pH5 - pH4) = 10^(5-4) = 10

Therefore, a solution of pH 4 is 10 times more acidic than a solution of pH 5.

The answer is B) 10.

~~~Harsha~~~

The correct answer is c. Methyl bromide is primarily used as a pesticide.

Methyl bromide is primarily used as a pesticide and fungicide. It works by releasing a gas that kills insects, weeds, and fungi. It is used in a variety of agricultural, commercial, and residential settings. In some cases, it is used to fumigate stored grains, ship hulls, soil, and other areas where pests and fungi may be present. It is also used to treat seed beds to kill weeds and fungi before planting. Methyl bromide can also be used in greenhouses to prevent the spread of pests and diseases.

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False. While both low explosives and high explosives release energy upon detonation, high explosives generally create a crater due to their faster and more violent energy release. Low explosives, on the other hand, burn at a slower rate and typically do not produce a crater.

An explosive event that occurs at, immediately above, or below the surface can cause material to be ejected from the ground's surface, creating an explosion crater.

An explosive event causes material from the ground to be displaced and ejected, creating a crater. Usually, it has a bowl-like shape. Three processes—high-pressure gas, shock waves—are in charge of making the crater:

-Ground deformation caused by plasticity.

-Ejecta, or material that is thrown up by an explosion, from the ground.

-The ground's surface spalling.

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Yes, both low explosives and high explosives have the ability to create a crater in the spot where the bomb detonates. This is because when explosives are detonated, they rapidly release large amounts of energy, which generates a high-pressure shock wave.

This shock wave then travels outward from the point of detonation, causing the surrounding ground to be displaced and ejected, resulting in a crater. However, the size and depth of the crater will depend on the type and amount of explosives used, as well as the nature of the surrounding soil and terrain. High explosives, which typically contain a higher percentage of energetic materials, are generally more powerful and capable of creating larger and deeper craters compared to low explosives.

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Total, 1262 grams of soda ash to produce 1000g of sodium bicarbonate.

Balanced chemical equation for the reaction between a soda ash and the hydrochloric acid to produce a sodium bicarbonate is;

Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O

The molar mass of NaHCO₃ is 84.01 g/mol, and the molar mass of Na₂CO₃ is 105.99 g/mol.

To calculate the amount of Na₂CO₃ need to produce 1000g of NaHCO₃, Firstly we need to calculate the number of moles of NaHCO₃;

1000 g NaHCO₃ x (1 mol NaHCO₃ / 84.01 g NaHCO₃) = 11.90 mol NaHCO3

From the balanced chemical equation, we can see that the stoichiometric ratio of Na₂CO₃ to NaHCO₃ will be 1:1. Therefore, we need 11.90 moles of Na₂CO₃;

11.90 mol Na₂CO₃ x 105.99 g/mol

= 1262 g Na₂CO₃

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The new pressure in mmHg is 11.23 if 12.8 liters of a gas are prepared at 750 mmHg and -108o C. the gas is then forced into a .855-liter cylinder in which the temperature warms up to 22o C.

According to Boyle's Law

[tex]P_{1}V_{1} =P_{2} V_{2}[/tex]

Substituting the value in the equation

[tex]750*12.8=P_{2} *855[/tex]

[tex]P_{2}[/tex]= 11.23 mmHg

Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law, is an experimental gas law that specifies the relationship between pressure and volume in a confined gas.

P1V1=P2V2 when temperature remains constant, according to Boyle's Law. Boyle's Law also indicates that pressure is inversely linked to volume. This indicates that as pressure increases, volume decreases (and vice versa). PV=k (k = the proportionality constant) is also stated by Boyle's Law.

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The chemical used as a measure of the oxidant level of the atmosphere at any given time is ozone (c).

Ozone is a powerful oxidizing agent and is used as an indicator of the overall oxidant level in the atmosphere.Ozone is a highly reactive gas that is formed by the action of sunlight on oxygen molecules. It is a powerful oxidant and is often used as a measure of the oxidant level of the atmosphere. High levels of ozone in the atmosphere can cause respiratory problems, especially in people with asthma or other respiratory illnesses. Nitrogen dioxide (a), carbon dioxide (b), and sulfur dioxide (d) are not used as measures of the oxidant level of the atmosphere.

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Homeostasis is the process by which a body is able to adapt to different conditions and keep the body in relatively stable internal conditions at all times.

During homeostasis, blood helps regulate the body temperature by eliminating excess heat, maintaining the pH balance of the body, and maintaining the internal osmotic pressure.

The immune system assists in homeostasis by screening and destroying pathogens and helps prevent autoimmunity as well as regulates immune reactions periodically. If the immune system fails to do these processes, then it may result in the appearance of cancer.

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Answer:

c

Explanation:

the daughter nucleus (nuclide) produced when Pb-211 undergoes beta decay by emitting an electron is Bi-211.

When Pb-211 undergoes beta decay, it transforms into a new nuclide by emitting an electron. Beta decay occurs when a neutron in the nucleus of an atom is transformed into a proton, and an electron (known as a beta particle) is emitted from the nucleus.

In this case, Pb-211 decays into Bi-211 through beta-minus decay. Beta-minus decay occurs when a neutron in the nucleus is converted into a proton, and an electron (beta particle) and an antineutrino are emitted. The process can be represented as follows:

Pb-211 → Bi-211 + e- + ν

In this equation, Pb-211 represents the parent nuclide, Bi-211 is the daughter nuclide, e- is the beta particle (electron) emitted during the decay, and ν is an antineutrino.

what is beta particle?

A beta particle, also known as a beta particle or beta radiation, is a high-energy, high-speed electron or positron that is emitted from the nucleus of an atom during radioactive decay.

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The gases frequently found in water that encourage corrosion are: b. Oxygen and carbon dioxide. The correct answer is option B)

The gases frequently found in water that encourage corrosion are option b: oxygen and carbon dioxide. These gases can react with the metal in pipes and cause corrosion over time. Chlorine can also contribute to corrosion, but it is not as common as oxygen and carbon dioxide. Methane and hydrogen sulfide are not typically found in water and are not significant contributors to corrosion.

Oxygen and carbon dioxide are two gases that are typically present in water and promote corrosion. These gases have the potential to corrode pipes over time by reacting with the metal. While chlorine is not as prevalent as oxygen and carbon dioxide, it can nevertheless lead to corrosion. Since they are not frequently present in water, methane and hydrogen sulphide do not significantly contribute to corrosion.

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The four mole ratios are: 6 KOH / 2 K₃PO₄, 2 KOH / 1 Co₃(PO₄)₂,

1 K₃PO₄ / 1 Co₃(PO₄)₂, 1 Co(OH)₂ / 2 KOH.

Mole ratio refers to the ratio between the number of moles of two substances in a chemical reaction.

The given chemical equation is:

2 KOH + Co₃(PO₄)₂ → K₃PO₄ + Co(OH)₂

And the first mole ratio given is:

6 KOH / 2 K₃PO₄

To find the other mole ratios, we need to first balance the chemical equation. It is already balanced, so we can proceed to find the other mole ratios:

(2) 2 KOH / 1 Co₃(PO₄)₂

This ratio indicates that two moles of potassium hydroxide react with one mole of cobalt(II) phosphate.

(3) 1 K₃PO₄ / 1 Co₃(PO₄)₂

This ratio indicates that one mole of potassium phosphate is produced for every mole of cobalt(II) phosphate that reacts.

(4) 1 Co(OH)₂ / 2 KOH

This ratio indicates that one mole of cobalt(II) hydroxide is produced for every two moles of potassium hydroxide that react.

Therefore, the four mole ratios are:

(1) 6 KOH / 2 K₃PO₄

(2) 2 KOH / 1 Co₃(PO₄)₂

(3) 1 K₃PO4 / 1 Co₃(PO₄)₂

(4) 1 Co(OH)₂ / 2 KOH

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Correct question is:

KOH + Co₃(PO₄)₂ →

With the above balanced equation, make atleast four mole ratios ( one is done for you ):

[tex]\frac{6KOH}{2K3PO4}[/tex]    -      -        -

Around 90% of all atoms in the universe are made of hydrogen, the simplest and lightest element, and they were all produced during the Big Bang.

Conditions were extremely hot and dense for the initial few minutes of the cosmos. The simplest element, hydrogen, was created in this atmosphere through a process known as nucleosynthesis. Helium was produced through the fusion of protons and neutrons during this process, along with trace amounts of lithium and beryllium. Hydrogen atoms would eventually go on to create stars and galaxies, resulting in the intricate universe we know today. As the most prevalent element in the universe, hydrogen is frequently used as a benchmark by astronomers who research the cosmos.

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Molecular sieves are effective in removing water to shift the equilibrium in esterification reactions because they have a highly specific pore size that selectively adsorbs water molecules.

This allows them to effectively remove water without reacting with or affecting the other components in the reaction mixture. Other drying agents might not be suitable for this purpose because they can either react with the reactants, products, or catalysts involved in the esterification process, or they may not be selective enough in removing only water, thus potentially affecting the overall reaction equilibrium.

Molecular sieves are often preferred as drying agents in esterification reactions because they have a high surface area and can selectively adsorb water molecules, thereby helping to shift the equilibrium towards the desired product. Other drying agents, such as calcium chloride or magnesium sulfate, may also be used but they have a lower selectivity for water and may also react with the reactants or products, potentially leading to unwanted side reactions. Additionally, molecular sieves can be easily regenerated by heating, making them more cost-effective than other drying agents in the long run.

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A reversible process occurs when a stable diamtonic molecule spontaneously forms, keeping the atoms' constant pressure and temperature.

Molecule is the smallest unit of a substance that still retains the chemical and physical properties of the original material. A molecule is made up of two or more atoms that are held together by chemical bonds. Molecules can be composed of any combination of elements, such as carbon, hydrogen, oxygen, nitrogen, and others. Molecule can be both simple, with just two atoms, or complex, with thousands of atoms forming a single molecule. Molecules can be found in everything from the air we breathe to the food we eat. Molecules are the building blocks of life, and understanding the structure and properties of molecules helps scientists gain insight into the natural world.

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124g/ml is the density of a sample of ozone gas at 755 Torr and 18C. Density is the mass of an object substance per unit volume.

Density is the mass of an object substance per unit volume. d = M/V, wherein d is density, M is the weight, and V is volume, is the formula for density. Grammes per cubic centimetre are a typical unit of measurement for density.

For instance, while Earth has a density of 5.51 grammes per cubic centimetre, water has a density of 1 grammes per cubic centimetre. The metre-kilogram-second (or SI) unit for density is kilogrammes per cubic metre. For instance, air weighs 1.2 kilogrammes per cubic metre.

Density=PM/RT

           = 755 ×48/0.0821×291

             =124g/ml

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The volume of the balloon is 6.24 L. The random motion of the gas particles is consistent with Newton's Laws of Motion.

the rule that states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gram of an ideal gas.

We can use the ideal gas law,

PV = nRT

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

Now, we have to convert the temperature to Kelvin:

T = 2 + 273.15 = 275.15 K

We can substitute the values,

P = 0.5 atm

n = 0.48 mol

R = 0.08206 L·atm/(mol·K)

T = 275.15 K

PV = nRT

V = (nRT)/P

V = (0.48 mol * 0.08206 L·atm/(mol·K) * 275.15 K) / 0.5 atm

V = 6.24 L

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Answer:

The solubility product constant, Ksp, for the reaction of copper(I) cyanide (CuCN) in water is given as 4x10^−20. The balanced chemical equation for this reaction is:

CuCN (s) ↔ Cu+ (aq) + CN− (aq)

The Ksp expression for this reaction is:

Ksp = [Cu+][CN−]

At equilibrium, the solution is saturated with CuCN, which means that the concentration of CuCN is equal to its solubility (S), and the concentrations of Cu+ and CN− are equal to x (the amount that dissolves). Thus, we can write:

CuCN (s) ↔ Cu+ (aq) + CN− (aq)

I S x x

The solubility of CuCN is equal to the amount that dissolves, which is equal to the initial concentration of Cu+ and CN− in the solution. Therefore:

[S] = [Cu+] = [CN−] = x

Substituting these values into the Ksp expression, we get:

Ksp = [Cu+][CN−] = x^2

Solving for x, we get:

x = sqrt(Ksp) = sqrt(4x10^-20) = 2x10^-10

Therefore, the concentrations of Cu+ and CN− in a saturated CuCN solution are both 2x10^-10 mol/L.

When treating water with chlorine in emergency situations, the chlorine dosage should be (d) doubled when the water is turbid or colored.

When treating water with chlorine in emergency situations, the chlorine dosage should be doubled when the water is turbid or colored. This is because the presence of suspended particles can reduce the effectiveness of the chlorine, so a higher dosage is needed to ensure that the water is properly disinfected.

If the water is cloudy or coloured, you should increase the chlorine dosage when treating it with chlorine in an emergency. This is due to the fact that suspended particles might decrease the chlorine's efficacy, necessitating a higher dosage to ensure that the water is effectively disinfected.

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Suppose a vodka martini contains 30% alcohol with the remaining portion of the drink composed of water What is the solute in this type of martini A ice B water C olive D alcohol E none of the above 6 We dissolve 2.45 g of sugar in 200.0 g water.

The solute in this type of martini is alcohol, as it is the substance being dissolved in the water portion of the drink.
Hi! In a vodka martini with 30% alcohol and the remaining portion composed of water, the solute is alcohol. This is because alcohol is the substance that is dissolved in the solvent water to form the solution martini. It is conventional wisdom in catering circles that at evening events two thirds of people choose white wine as their beverage. The new catering manager at Simmons would like to know whether or not this figure holds true at Simmons.

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If the complete photoelectron spectra (pes) for an element shows three peaks of identical size, this indicates that the element has three valence electrons with similar energy levels.

This information can be useful in determining the element's chemical properties and potential reactions with other elements. The complete photoelectron spectra (PES) for an element showing three peaks of identical size indicates that the element has three electron subshells with the same number of electrons in each subshell. This suggests that the element has a balanced electron distribution within its energy levels.

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A chemical reaction that occurs under a given set of conditions is called a specific reaction.

A specific reaction refers to a chemical reaction that occurs under certain given conditions, such as temperature, pressure, and the presence of specific reactants or catalysts. The conditions required for a specific reaction can vary widely depending on the nature of the reactants and products involved.

In chemistry, specific reactions are often studied in relation to the reaction kinetics, or the rate at which the reaction occurs. The rate of a specific reaction can be affected by a number of factors, including the concentration of the reactants, the temperature and pressure of the reaction environment, and the presence of catalysts or inhibitors.

Specific reactions can also be classified into different types based on the nature of the reactants and products. For example, a combustion reaction involves the rapid oxidation of a fuel, typically with the production of heat and light, while a precipitation reaction involves the formation of a solid precipitate when two aqueous solutions are combined.

Understanding specific reactions is an important part of many areas of chemistry, including materials science, pharmaceuticals, and environmental science. By studying the conditions required for specific reactions, scientists can develop new materials, drugs, and technologies that can be used to address a wide range of practical problems.

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In this experiment, it is crucial to use room temperature deionized (DI) water from the larger carboys in the lab when creating your alkaline earth hydroxide solution. There are a few reasons why you must use the DI water from the carboys instead of tap water.

1. Purity: DI water from the carboys is of higher purity than tap water. Tap water typically contains dissolved salts, minerals, and other impurities that can interfere with the chemical reactions or affect the accuracy of the experiment results. Using DI water ensures that these unwanted contaminants are not introduced into the solution. 2. Consistency: Laboratory carboys are designed to provide consistent water quality, ensuring that the DI water used in the experiment remains the same throughout the process. On the other hand, tap water quality may vary over time, which can introduce inconsistencies and errors into the experiment. 3. Controlled temperature: The DI water in the carboys is maintained at room temperature, which is essential for the accurate preparation and execution of the experiment. Tap water temperature can fluctuate, potentially affecting the chemical reactions and the reproducibility of the experiment results. 4. Reduced risk of contamination: Using DI water from the carboys minimizes the risk of introducing any bacteria or other contaminants that might be present in tap water. This ensures that the experiment is conducted in a controlled environment and that the results obtained are reliable and accurate. In summary, using room temperature DI water from the larger carboys in the lab is crucial for the accuracy, consistency, and reproducibility of the experiment when creating your alkaline earth hydroxide solution. This helps to minimize errors, avoid unwanted reactions, and maintain the purity and reliability of the experiment results.

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The strongest type of intermolecular forces that must be overcome in order to evaporate benzene (C₆H₆), boil chloroform (CHCl₃), and boil liquid ammonia (NH₃) are dispersion, dipole-dipole, and H-bonding, respectively.

Intermolecular forces are the forces of attraction or repulsion that occur between neighboring molecules. These forces are weaker than the intramolecular forces that bind atoms together to form molecules, but they still play an important role in determining the properties and behavior of substances.

Benzene is a nonpolar molecule with no permanent dipole moments and so the strongest intermolecular force is dispersion. Chloroform is a polar molecule and so the strongest intermolecular force is dipole-dipole. Lastly, liquid ammonia is a polar molecule that is capable of forming hydrogen bonds and so the strongest intermolecular force is H-bonding.

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Answer:

Have a Nice Best Day : )