a certain liquid has a normal boiling point of and a boiling point elevation constant . calculate the boiling point of a solution made of of urea () dissolved in of . round your answer to significant digits.

The temperature that must be maintained on 0.500 mole of the gas in order to maintain the pressure is 21.76 °C

From the question given above, the following data were obtained obtained:

Using the ideal gas equation, we can obtain the temperature as follow:

PV = nRT

1.21 × 10 = 0.500 × 0.0821 × T

12.1 = 0.04105 × T

Divide both sides by 0.04105

T = 12.1 / 0.04105

T = 294.76 K

Subtract 273 to obtain answer in °C

T = 294.76 - 273 K

T = 21.76 °C

Thus, the temperature needed is 21.76 °C

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In this case, the solute of the solution is KCl.A solution is composed of two main components: the solvent and the solute. In this case, water is the solvent and KCl is the solute.

A solution is a homogeneous mixture composed of a solute and a solvent. The solute is the component that is being dissolved, while the solvent is the component that does the dissolving. When a solute is added to a solvent, it can either dissolve, remain undissolved, or partially dissolve.

The degree of solubility of a solute in a solvent depends on several factors, such as temperature, pressure, and the chemical properties of the solute and solvent. The resulting solution will have the same composition throughout, meaning the concentration of the solute will be uniform. Solutions can be classified into different categories, such as dilute, concentrated, saturated, and supersaturated, depending on the amount of solute present in the solution.

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Aluminum ion has a charge of 3+, Al³⁺, and sulfate is SO₄²⁻, so the compound aluminum sulfate has to have a number of aluminum and sulfate such that the final charge is zero, so the proportion on aluminum sulfate is:

That way we have 6+ and 6-, so neutral compound.

This means that for 1 mol of aluminum sulfate, we have 2 moles of aluminum ion. The molar concentration is the number of moles of solute divided by the volume of solution, so it is directly proportional to the number of moles.

So, we can use a rule of three as follows:

aluminum ion --- aluminum sulfate

2 --- 1

x --- 0.646 M

So:

So, the concentration of aluminum ion in this solution is 1.292 M.

Answer:

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge).

Explanation:

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge).

The nucleus (centre) of the atom has the protons (positively charged) and the neutrons (no charge).

Protons and neutrons are in the centre of the atom, creating the nucleus. Electrons wrap with the nucleus. Protons have a positive charge. Electrons have a negative charge.

Thus, The nucleus (centre) of the atom has the protons (positively charged) and the neutrons (no charge).

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Answer:

because of energy difference between (n1)d and ns orbitals (sub levels) and involvement of both orbital in bond formation

Explaination:

the reason is that there is a difference in energy of orbitals of an atom of transition metal, so there (n1)d orbitals and there ns orbitals both make a bond and for this purpose they lose an electron that is why both sublevels shows different oxidation state.  

Hope this helped you

Transition metals have multiple oxidation states because of their partially filled orbitals . Thus option b is correct.

Transition metals are defined as essentially, a configuration attended by reactants during complex formation, as well as the reaction coordinates.

It can also be defined as a very short-lived atomic configuration at a reaction-energy diagram's local energy maximum.

Transition metals are best defined as an element with a partially filled d sub-shell on its atom or that can give rise to cations with an incomplete d sub-shell.

Transition state is defined as a chemical reaction is defined as a certain configuration along the reaction coordinate.

Oxidation state is defined as the total number of electrons that have been deleted or added to an element.

It can also be defined as an atom's charge if all of its links to other atoms were entirely ionic.

Thus, transition metals have multiple oxidation states because of their partially filled orbitals . Thus option b is correct.

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0.0014 atm is the pressure of nitrogen at 20 °C and 730 mm Hg initial pressure when its volume increases from 875 ml to 955 ml

Since the mass of the gas is maintained during the change in volume, the number of moles with the initial volume must first be calculated.

To calculate the moles of gas, the ideal gas equation is used:

PV = nrt

where

P = Pressure

V=Volume

n = moles

T = temperature

R = gas constant

It is cleared n:

n = PV/Rt

n = PV/Rt

Data

P = 730 mmHg = 0.96 atm

V = 875ml = 0.875L

n = ?

T = 20°C = 293.15K

R = 0.082 L atm/mol °K

n = PV/Rt

n = 0.96. 0.875 / 0.082. 293.15

n = 0.84 / 24.03

n = 0.035 moles

Knowing the moles of nitrogen, the new pressure of the gas is calculated after changing its volume.

Data

P = ?

V = 955ml = 0.955L

n = 0.035 moles

T = 20°C = 293.15K

R = 0.082 L atm/mol °K

P = nRt/V

P = 0.035. 0.955 / 0.082. 293.15

P = 0.033 / 24.03

P = 0.0014 atm

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Answer:

72.14878 grams

Explanation:

Answer:

Synthesis Reaction

Explanation:

It is a synthesis Reaction because it is taking little reactants and forming a big product!

Answer:

Explained below.

Explanation:

First of all, the orbital path of electron is mostly parabolic in electric field.

In an electric field, electrons behave very similar to a projectile. Thus, Electrons have a parabolic path in an electric field simply because the speed of the electrons in a direction which is perpendicular to the electric field is constant since there is no force. Therefore, there will be no acceleration along that perpendicular direction. However there will be an acceleration that is constant in the direction of the electric field which makes it act in a similar manner to a projectile under gravity.

Answer:

Tác giả văn bản ' Mẹ tôi ' : Edmondo De Amicis ( 1846-1908 ) là nhà văn người Ý ( I-ta-li-a )

Answer:

the method is fractional distillation

1) a) The apparatus that can be used to separate a mixture of ethanol and water is called a fractional distillation apparatus. It consists of the following components:

b) The method of separation used in this apparatus is called fractional distillation.

2) In fractional distillation, the fractionating column provides additional surfaces for the vaporized components to condense and revalorize.

Distillation flask: This is a round-bottomed flask where the mixture of ethanol and water is initially placed.

Fractionating column: A long column with several glass beads or plates. It provides a large surface area for the vaporized components to condense and revalorize, aiding in the separation process.

Thermometer: It is placed at the top of the fractionating column to monitor the temperature during the distillation process.

Condenser: It is a coiled glass tube connected to the fractionating column. Cold water flows through the condenser, causing the vaporized components to condense back into liquid form.

Receiver flask: This is where the separated components are collected. The receiver flask is placed at the end of the condenser.

b) The method of separation used in this apparatus is called fractional distillation. Fractional distillation is employed when the components of a mixture have similar boiling points. In the case of ethanol and water, they form an azeotropic mixture with a boiling point of around 78.2°C. Simple distillation would not effectively separate these two components because they would boil together and vaporize simultaneously.

In fractional distillation, the fractionating column provides additional surfaces for the vaporized components to condense and revaporize. This repeated condensation and revalorization process allows for more efficient separation. The higher surface area in the fractionating column helps to achieve better separation of the ethanol and water, resulting in a more concentrated sample of ethanol in the distillate collected in the receiver flask.

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When a positively charged rod is brought near a charged electroscope, the electroscope leaves move closer to each other, indicating that the electroscope has a negative charge.

When a positively charged rod is brought near a charged electroscope, the positively charged rod polarizes the charges in the electroscope. Initially, the electroscope may have a neutral charge, meaning the number of positive and negative charges within it are balanced. However, when the positively charged rod is brought close to the electroscope, it repels the positive charges in the electroscope and attracts the negative charges.

As a result, the positive charges within the electroscope are pushed away from the rod, while the negative charges are attracted toward it. This redistribution of charges creates a separation of charge within the electroscope.

Since the positive charges are repelled and move away from the leaves of the electroscope, the negatively charged leaves experience a net attractive force. This force pulls the leaves closer together, causing them to move toward each other.

Therefore, the electroscope acquires a negative charge as a result of the positively charged rod being brought near it.

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Answer:

Answer: 72.58 km/hr

Explanation:

\(\frac{45 miles}{1 hour}\)×\(\frac{1 km}{0.62 miles}\) = 72.58 km/hr

Answer:

it is 72.9 km/h

Explanation:

just multiply 45 * 1.62 = ~72.9

The cork cells are the dead cells and they are present periphery of roots and stems of matured plants. Here a Cork Cell is multicultural.

The organisms which is made up of a single cell is defined as the unicellular organisms whereas the organisms with numerous cells are called multicellular organisms. The bacteria is a unicellular organism and humans are multicellular.

In unicellular organisms a single cell carry the whole functions whereas in multicellular organisms multiple cells perform many functions. The body organization of unicellular organism are simple whereas the multicellular organisms have complex body organization.

Here cork cells are multicellular. A protective coat of a tree seen in outer region is called cork. It prevents water loss through bark. A cork is composed of multiple thick layers.

Thus cork cell is a multicellular cell.

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"Group analysis" is a well-known qualitative analysis method that is used with NaBiO3 for this objective. Its distinctive characteristics are by subjecting a mixture of cations to a series of reagent treatments.

Zn has a larger negative reduction potential than Mn. As a result, if we add a potent oxidising agent, Mn+2 will remain unaffected and Zn will be preferentially oxidised to its +2 oxidation state. We may then segregate the two species as a result.

As a result, we can separate the two species by adding NaBiO3 to the solution of Mn+2(aq) and Zn+2(aq). Zn+2 will be converted by the NaBiO3 to Zn(OH)4 and precipitated out of the solution, but Mn+2 will remain in the solution as Mn(OH)2. Zn+2 cannot be oxidised by the other specified reagents since they lack potent enough oxidising abilities.

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Answer:

Regulation of body temperature

Explanation:

The amount of chlorine gas released throughout the experiment weighs 49.70 g.

A mole (mol) is the amount of a substance that has exactly as many particles as there are atoms in 12 grams of carbon-12.

The number of moles is obtained by dividing the specified mass of a substance by its molar mass. The weight of one mole of a substance is its molar mass, which is expressed in grams per mole.

Having said that,

The number of molecules in 1 mole of chlorine gas would be 6.02 * 1023.

Chlorine gas would contain 4.21 * 1023 molecules per mole.

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Stirring affects how quickly a solute dissolves in a solvent, but has no effect on how much solute will dissolve. The amount of solute that will dissolve is affected by temperature - more will dissolve at higher temperatures. This is called the solubility of the solute

Answer:

biomass is a plant of animal material used as fuel to produce electricity

Tidal power is energy harnessed by converting engery from tides

That's what I know so far and took notes on hope it helped:)

Answer:

4,768.57

Explanation:

If you are asking us to calculate, your answer is above. Easiest and fastest way is to plug it into the calc.

The property of acids which would cause acid rain to damage buildings over time is:

Acids react with limestone.

The correct answer choice is option c.

This simply means that acids has this property which corrodes the surface they come in contact with especially stones.

However, this can be done by coating the surface of metals, or carbonate by coating it with other metals. By so doing, this can prevent acid rain damage to it.

That being said, by default, concentrated acids are highly corrosive.

Coating surfaces of metals can prevent acid rain damage to it

This refers to a substance which when dissolved in water, it produces hydrogen ion as the only positive ion in the solution.

So therefore, the property of acids which would cause acid rain to damage buildings over time is acids react with limestone.

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

The vibrational partition function (Q) for chlorine at 25°C, summing over the lowest 4 vibrational levels, is given by the simplified expression: Q = e^(-2.220).

The relative population between the first and second excited vibrational energy levels (N1/N2) of chlorine at 298 K (25°C) can be calculated using the relative Boltzmann factors, taking into account the energies of the levels and the Boltzmann constant.

The vibrational partition function (Q) represents the sum of the Boltzmann factors for all the vibrational energy levels. For a diatomic molecule like chlorine (Cl2), assuming equally spaced vibrational energy levels and a degeneracy (g) of 1 for each level, we can calculate the partition function.

To calculate Q, we sum over the lowest 4 vibrational levels, taking into account the energy spacing between levels.

The energy spacing between levels is given as 558 cm^(-1), which we convert to Joules using the conversion factor of 1 cm^(-1) = 1.986445 × 10^(-23) J.

Using the formula for the partition function:

Q = e^(-E1/(kT)) + e^(-E2/(kT)) + e^(-E3/(kT)) + e^(-E4/(kT))

Substituting the values:

Q = e^(-5581.98644510^(-23)/(1.3806510^(-23)(25+273)))

Simplifying the exponent and performing the calculations:

Q ≈ e^(-2.220)

Therefore, the vibrational partition function (Q) for chlorine at 25°C, summing over the lowest 4 vibrational levels, is approximately e^(-2.220).

The relative population between the first and second excited vibrational energy levels (N1/N2) of chlorine at 298 K (25°C) can be calculated using the relative Boltzmann factors, taking into account the energies of the levels and the Boltzmann constant.

The relative population (N1/N2) between two vibrational energy levels can be determined using the Boltzmann factors, which depend on the energies of the levels and the temperature.

The energy difference between the ground state and the first excited level is given as 558 cm^(-1), which we convert to Joules using the conversion factor of 1 cm^(-1) = 1.986445 × 10^(-23) J.

Using the Boltzmann factor formula:

N1/N2 = e^(-ΔE/(k*T))

Substituting the values:

N1/N2 = e^(-5581.98644510^(-23)/(1.38065*10^(-23)*298))

Simplifying the exponent and performing the calculations:

N1/N2 ≈ e^(-1.524)

Therefore, the relative population between the first and second excited vibrational energy levels (N1/N2) of chlorine at 298 K (25°C) is approximately e^(-1.524).

Note: The relative population is given as a ratio of the populations between the two levels.

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Answer:

The term Big Bang defines that the Universe has expanded from the ancient hot and thick primary situation at some fixed time in the past.

Big Bang theory refers to the origin of the Universe. In the beginning, universe is very heavy and small hot ball of matter. It was a point no bigger than the head of a pin when all the things squished with each other and universe is expanded with huge explosion of energy. Due to expansion, it is cooled and results in the formation of Stars and galaxies. After sometime, atoms formed like helium and hydrogen.

Thus, statement (1), (3) and (4) is correct whereas statement (2) and (5) is incorrect. the right answer is - (It expanded slowly), (Stars and galaxies formed,) (Atoms such as hydrogen and helium formed.)

Explanation:

The statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.

The big bang theory is a widely accepted theory in physics that intends to understand the origin of the universe.

According to this theory, the universe started with a hot and dense single point that progressively inflated and stretched.

The big bang theory has two major principles:

The big bang theory postulates that this phenomenon occurred approximately 13 billion years ago.

In conclusion, the statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.

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The pH of a solution is related to the concentration of H+ ions in the solution by the following equation:

pH = -log[H+]

where [H+] is the concentration of H+ ions in moles per liter (M).

For the acid H2SO4, the dissociation can be written as follows:

H2SO4 ⇌ H+ + HSO4-

The acid dissociation constant, Ka, is defined as:

Ka = [H+][HSO4-]/[H2SO4]

Rearranging this equation gives:

[H+][HSO4-] = Ka[H2SO4]

Since the solution contains HSO4- ions, we can assume that all of the H2SO4 has dissociated, and therefore [H2SO4] = 0.15 M. We can also calculate the concentration of H+ ions using the pH:

pH = -log[H+]

10^(-pH) = [H+]

10^(-1.43) = [H+]

[H+] = 3.56 × 10^(-2) M

Substituting these values into the equation for Ka gives:

(3.56 × 10^(-2))(x) = Ka(0.15)

where x is the concentration of HSO4- ions. Solving for Ka:

Ka = (3.56 × 10^(-2))(0.15)/x

Ka = 5.34 × 10^(-3)/x

Therefore, the value of Ka depends on the concentration of HSO4- ions, which was not given in the problem. Without additional information, we cannot calculate the value of Ka.

Answer:

Turning the lights off when they're not needed.

Answer:

Explanation:

he gave you a virus, dont click it