the heat of fusion of water is . calculate the change in entropy when of water freezes at .

Answer:

D

Explanation:

More liquid water molecules will change to water vapor until a

new equilibrium is reached.

Answer:

Equilibrium and Stability Quick Check

1. The rate of the forward reaction equals the rate of the reverse reaction.

2. More LIQUID WATER molecules will change to WATER VAPOR until a new equilibrium is reached.

3. By adding WATER (H2O).

4. The additional BROMINE IONS cause the equilibrium to shift to the REACTANTS.

5. Removing WATER (H2O).

Explanation:

100% if you put these answers.

(a) The wavelength of the electron is 202.25885 nm

(b) The minimum energy required to remove the electron is 1.6565 × 10⁻¹⁷ J

(c) The wavelength of the causing radiation is approximately 8.84 nm

(d) X-ray

The question parameters are;

The given parameters of the electron are;

The velocity of the electron, v = 3.6 × 10³ km/s

(a) de Broglie wavelength is given as follows;

λ = h/(m·v)

Where;

λ = The wavelength of the wave

h = Planck's constant = 6.626 × 10⁻³⁴ J·s

m = The mass of the electron = 9.1 × 10⁻³¹ kg

Therefore, we get;

λ = 6.626 × 10⁻³⁴/(9.1 × 10⁻³¹ × 3.6 × 10⁶) = 202.25885 × 10⁻⁶

The wavelength, λ, of the electron is 202.25885 × 10⁻⁶ m = 202.25885 nm

(b) The energy required to remove the electron from the metal surface is known as the work function, W₀, which is given by the following formula

W₀ = h·f₀

Where;

f₀ = The threshold frequency

Given that the threshold frequency, f₀ = 2.50 × 10¹⁶ Hz, we have;

W₀ = 6.626 × 10⁻³⁴ J·s × 2.50 × 10¹⁶ Hz = 1.6565 × 10⁻¹⁷ J

The energy required to remove the electron from the metal surface, W₀ = 1.6565 × 10⁻¹⁷ J

(c) The wavelength of the radiation that caused the photoejection of the electron is given as follows;

The energy of the incoming photon, E = W₀ + (1/2)·m·v²

Where;

v = The velocity of the electron, and m = The mass of the electron

Therefore;

E = 1.6565 × 10⁻¹⁷ + (1/2) × 9.1 × 10⁻³¹ kg × (3.6 × 10⁶ m/s)² = 2.24618 × 10⁻¹⁷ J

We have;

E = h·f

∴ f = (2.24618 × 10⁻¹⁷ J)/(6.626 × 10⁻³⁴ J·s) = 3.38994869 × 10¹⁶ Hz

The speed of light, c = 299,792,458 m/s

From the equation for the speed of light, we have;

λ = c/f

∴ λ = (299,792,458 m/s)/(3.38994869 × 10¹⁶ Hz) = 8.84356919 nm ≈ 8.84 nm

The wavelength of the radiation that caused photoejection of the electron, λ\(_{causing \ radiation}\) ≈ 8.84 nm

(d) The kind of electromagnetic radiation used which has a wavelength of 8.84 nm is the X-Ray which are electromagnetic radiation having wavelengths that extend from 10 picometers to 10 nanometers.

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Calcium carbonate (CaCO₃) is quite soluble in the presence of acidic solutions inspite of having small solubility product .

Step-by-step explanation:

1. Solubility product: This is the equilibrium constant for a solid substance dissolving in an aqueous solution. It represents the concentration of the dissolved ions when the solution is at equilibrium.

2. Calcium carbonate (CaCO₃): This is a common compound found in rocks, shells, and many other natural sources. It is sparingly soluble in water, which means only a small amount dissolves to form a saturated solution.

3. A substance is considered soluble if it can dissolve in a solvent, such as water, to form a homogeneous mixture called a solution.
Acidic solutions: Calcium carbonate is more soluble in acidic solutions because the acid reacts with the CaCO₃, forming soluble calcium ions (Ca²⁺) and an acidic anion (e.g., CO₂ and H₂O when reacting with a strong acid like HCl). This reaction increases the solubility of calcium carbonate by removing it from the equilibrium, allowing more CaCO₃ to dissolve in the solution.

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Using the equations for the ionization of each proton (H+) :

k1 = 2.5x10^-4 and k2 = 2.5x10^-7. (for H₃AsO₄, ka1 = 2.5x10-4. ka2 = 5.6x10-8, ka3 = 3.0x10-13)

k1 and k2 for H₃AsO₄, we need to use the equations for the ionization of each proton (H+):

H₃AsO₄ + H₂O ⇌ H₃O+ + H₂AsO₄⁻   (Ka1)

H₂AsO₄⁻ + H₂O ⇌ H₃O+ + HAsO₄²⁻  (Ka2)

Ka1 = [H₃O+][H₂AsO₄⁻]/[H₃AsO₄]

2.5x10^-4 = [H₃O+][H₂AsO₄⁻]/[H₃AsO₄]

Ka2 = [H₃O+][HAsO₄²⁻]/[H₂AsO₄⁻]

5.6x10^-8 = [H₃O+][HAsO₄²⁻]/[H₂AsO₄⁻]

Since we are given the concentrations of H₃AsO₄, H₂AsO₄⁻, and HAsO₄²⁻ are initially negligible, we can assume that the concentrations of H₃O+ and H₂AsO₄⁻ are equal to x at equilibrium. Then, the concentration of HAsO₄²⁻ at equilibrium is (x^2)/[H₃AsO₄].

Using these assumptions and solving the equations for x, we get:

Ka1 = x^2/[H₃AsO₄] = x^2/(0.1 M) = 2.5x10^-4

x^2 = 2.5x10^-5

x = 5.0x10^-3 M

Ka2 = x^2/[H₂AsO₄⁻] = (5.0x10^-3 M)^2/(0.1 M) = 2.5x10^-7

Therefore, k1 = 2.5x10^-4 and k2 = 2.5x10^-7.

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Mole fraction of dextrose = moles of dextrose / total moles of solution

Total moles of solution = moles of dextrose + moles of water

Given, moles of dextrose = 0.25 mol

Moles of water = 89.48 mol

Total moles of solution = 0.25 mol + 89.48 mol = 89.73 mol

Mole fraction of dextrose = 0.25 mol / 89.73 mol = 0.0028

Rounding to 2 significant figures, the mole fraction of dextrose in the solution is 0.0028.

Answer:

52. 3

53. 2

54. 2

55. 5

Not sure what the line is on number 54, but I think the answer is 2.

The solubility of a salt can be determined by comparing the Ksp values. The Ksp value represents the equilibrium constant for the dissolution of a salt in water. A smaller Ksp value indicates lower solubility.
To find the salt that is least soluble in water, compare the Ksp values of the salts given. The salt with the smallest Ksp value will be the least soluble.
Without the Ksp values, it is not possible to determine which salt is least soluble. Please provide the Ksp values, and I will be happy to assist you further.
Without the Ksp values of the salts, it is not possible to determine which salt is least soluble in water.
The solubility of a salt in water is determined by its Ksp value. The Ksp value represents the equilibrium constant for the dissolution of a salt in water. A smaller Ksp value indicates lower solubility. Therefore, to find the salt that is least soluble in water, we need to compare the Ksp values of the given salts. However, you haven't provided the Ksp values in your question, so it is not possible to determine which salt is least soluble. Please provide the Ksp values for the salts, and I will be happy to assist you further.
Without the Ksp values of the salts, it is not possible to determine which salt is least soluble in water.

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Answer:

convection

Explanation:

Answer:

2.25 moles H2

Explanation:

The equation N2+ 3H2 > 2NH3

1 mol of N2 gives 3 mol of H2

Then

. 75 mole N2 give 3*.75 = 2.25 moles of H2

The principal information that can be obtained from a mass spectrum of an organic compound include molecular mass, molecular formula, identification of functional groups, and definitive solution of C-H framework. Thus, the correct options are A, B, C, and D.

Mass spectroscopy can provide the following information: Molecular weight, Molecular formula, Structural information, such as connectivity of atoms, functional groups, and the degree of saturation. Isotopic composition of atoms in the molecule.

The mass spectrum can provide information on a compound's molecular weight and its molecular formula. It can also provide information on the compound's structural elements, such as the presence of functional groups or the degree of saturation. Mass spectrometry is often used to identify organic compounds.

Therefore, the correct options are A, B, C and D.

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Answer:

Nucleic acids determine the types of protein synthesis synthesized within cells.

What are nucleic acids synthesized by?

Viral nucleic acid synthesis is catalyzed by both viral and host enzymes, the relative contribution of which is determined by the type of virus and the specific molecule. Viruses with RNA genomes, except for the retroviruses, synthesize mRNA and replicate their genomes using virus-encoded RNA-dependent RNA polymerases.

See an example below:

Hope this helps :)

Pls brainliest...

Nucleic acids determine the types of proteins synthesized within cells.

In a cell, nucleic acids such as DNA and RNA play crucial roles in storing and transmitting genetic information. This genetic information serves as instructions for producing proteins, which are essential for numerous cellular processes and functions.

The process of protein synthesis begins with the transcription of DNA into RNA, specifically messenger RNA (mRNA). The mRNA then carries this genetic information from the cell nucleus to the ribosomes in the cytoplasm. At the ribosomes, the mRNA's genetic code is translated into a sequence of amino acids, which are the building blocks of proteins. This process is called translation.

The specific order of amino acids in a protein determines its structure and function. Since the genetic information in nucleic acids dictates the amino acid sequences in proteins, nucleic acids are responsible for determining the types of proteins synthesized within cells.

In summary, nucleic acids are essential for the storage and transmission of genetic information that determines the types of proteins synthesized in cells. These proteins play vital roles in cellular structure, function, and regulation, contributing to the overall health and maintenance of an organism.

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The intermolecular forces listed in the answer options are ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces, listed from strongest to weakest.

Ionic bonding is stronger than all of the intermolecular forces mentioned, yet it is not an intermolecular force in and of itself. The strength of the London force will vary greatly if the molecules have highly differing molar masses (by a factor of 2 or more). In this situation, the one with the significantly higher molar mass will have stronger overall intermolecular forces. An electronegative atom on a second molecule is drawn to a hydrogen atom on a first molecule. The characteristics of substances are influenced by intermolecular forces. Larger molecules have stronger intermolecular forces than smaller molecules do.

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Answer:

La fórmula empírica es C₂N₂K₅

Explanation:

La fórmula empírica es la expresión más sencilla para representar un compuesto químico e indica los elementos que están presentes y la proporción mínima en números enteros que hay entre sus átomos. A esta fórmula se le conoce también como “fórmula mínima” .

En otras palabras, la fórmula empírica muestra la proporción entre los átomos de un compuesto químico.

Si supones que tenes 100 gramos del compuesto, los porcentajes en masa indicarán los gramos de cada elemento en esos 100 gramos. Si la sustancia está compuesta por 18,4% de carbono, 21,5% de nitrógeno y 60,1% de potasio, entonce habrá 18,4 g de carbono, 21,5 g de nitrógeno y 60,1 g de potasio

Para la obtención de la fórmula empírica entonces, teniendo en cuenta la masa molecular de cada sustancia, en primer lugar se calcula el número de moles relativos de cada elemento químico:

C: 18.4 g/12 g/mol = 1.5 moles

N: 21.5 g/14 g/mol = 1.5 moles

K: 60.1 g/16 g/mol = 3.75 moles

De esta manera hallas la relación entre el número de moles de los distintos elementos, pero no estará expresada en forma de números enteros y sencillos. Para expresar la relación anterior en forma de números enteros y sencillos, divides el número de moles de cada elemento entre el número de moles menor de todos ellos.

C =  1.5 moles/ 1.5 moles = 1

N =  1.5 moles/ 1.5 moles = 1

K =  3.75 moles/ 1.5 moles = 2.5

Si no se obtiene una relación de números enteros, debes multiplicar por un número sencillo para conseguirlo. En este caso, multiplicando por dos obtienes:

C= 2

N= 2

K= 5

La fórmula empírica es C₂N₂K₅

The empirical formula of the compound will be CNK

To get the empirical formula of the compound, we will follow the steps below;

Divide the mass of the elements by the molar mass to get the moles of each element;

Divide through by the smallest ratio to get the ratio of each element present in the compound

The empirical formula of the compound will be CNK

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A lizard basking in the morning sun is an example of behavior known as thermoregulation. Thermoregulation is a behavior that allows animals to control their body temperature by adjusting to the surrounding environment.

A lizard basking in the morning sun is an example of this behavior, as it is a common way for reptiles to regulate their temperature. By absorbing heat from the sun, the lizard can increase its body temperature to an optimal level that is necessary for its metabolic processes to function properly. This helps the lizard maintain its energy levels and overall health, and is crucial for survival in a changing and unpredictable environment. Thermoregulation is an important adaptation that has evolved in many species to help them cope with variations in temperature, and is essential for their survival.

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Explanation:

Relative molecular mass of CH4 = 12 * 1 + 4 = 16

Relative molecular mass of SO2 = 32 + 10 *2 = 64

tSO2/tCH4 = √MSO2/MCH4

t/20 = √64/16 = √4

t/20 = 2

∴ t = 20 * 2 = 40sec

Answer:

The percentage yield is 80.36% (see calculations in attachment).

Explanation:

The theoretical  yield of the reaction is the amount of product that would result if all the  limiting reagent reacted. The theoretical yield is calculated using the balanced equation.

In practice, the actual yield, or the amount of  product actually obtained from a reaction, is almost always less than the theoretical  yield.

To determine how efficient this reaction is, we need to calculate the percent  yield, which describes the proportion of the actual yield to the theoretical yield. It is  calculated as follows:

\( %yield = actual yield ÷ theoretical yield × 100% \)

First we need to make sure that the equation is properly balanced. In the question they provide the balanced equation.

Since water is in excess, we calculate the theoretical yield using PCl₃.

The ion that would represent the ion of an element from Group 2A is A superscript 2 plus (A²+).

GROUP 2 ELEMENTS:

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Answer:

I could be wrong but I say it's letter b

Explanation:

I hope you have an great night

Protons and neutrons are particles that are approximately the same size, while electrons are much smaller. As a result, the correct option is C, neutrons.

The mass of an atom is concentrated in its nucleus, which is made up of protons and neutrons. Electrons revolve around the nucleus of an atom. Electrons are much smaller than the nucleus of an atom, which is made up of protons and neutrons. Protons and neutrons are similar in mass, while electrons are considerably less massive. The correct answer is option C, which is neutrons, because protons and electrons are not similar in mass. In fact, electrons are about 1800 times less massive than protons and neutrons. Quarks are the smallest particles that make up the particles that form atoms. These particles come in six different flavours and are held together by other particles known as gluons. However, quarks' masses are not similar to one another.

Electrons, which are much less massive than protons and neutrons, and quarks, which do not have equivalent masses, are not particles of almost equal mass. Consequently, option C, neutrons, is the correct answer.

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The equilibrium composition of CO₂ is determined to be 0.59 kmol.

To solve this problem, we can use the ideal gas law and the equilibrium constant expression for the reaction:

CO + 1/2O₂ ⇌ CO₂

Given the initial number of moles of CO and O₂, we can set up an ICE (Initial, Change, Equilibrium) table. Let's assume that x kmol of CO is consumed and converted to CO₂. Then, the change in the number of moles for each species is:

CO: -x kmol

O₂: -0.5x kmol

CO₂: +x kmol

At equilibrium, the number of moles of CO is (2 - x) kmol, O₂ is (3 - 0.5x) kmol, and CO₂ is x kmol. The equilibrium constant expression can be written as:

Kp = (P_CO₂) / (P_CO * P_O₂(1/2))

Given Kp = 16.461 and the pressure conditions, we can substitute the equilibrium partial pressures into the expression:

16.461 = x / ((2 - x) * (3 - 0.5x)(1/2))

Solving this equation yields x ≈ 0.59 kmol.

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Answer:

The element belongs to group 15 of the present periodic table

Explanation:

Isotopes have the same proton number, what differs is that they have different number of neutrons.

Now since the half-sum of their neutrons is 19, the total number of neutrons would be 19 * 2 = 38 neutrons.

Also, their masses add up to be 68, since the total mass equals sum of neutrons and sum of protons, this means that the total number of protons is 68-38 = 30

Since this is equal in both isotopes, this means that the proton number of the element is 30/2 = 15

The atomic number is the number of protons in the nucleus of an atom. Since the atomic number is 15, this element is phosphorus and it belongs to group 15 of the present periodic table

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Answer:

8x8 Inc. is a provider of Voice over IP products. 8x8 products include cloud-based voice, contact center, video, mobile and unified communications for businesses.

Explanation:

Answer:

Magnesium and strontium

Explanation:

11 protons and 11 electrons, 12 neutrons.

The atomic number of sodium is 11, therefore the number of electrons and protons are 11. The atomic mass is 23, and to find neutrons you need to subtract the atomic number from the atomic mass, therefore the number of neutrons are 12.

The moles of KHP is multiplied by the mole ratio of NaOH to KHP, which is determined by the balanced chemical reaction mentioned above, to determine the number of moles of NaOH.

By dividing the moles of sodium hydroxide by the number of liters of sodium hydroxide solution needed to reach the titration's endpoint, the molarity of the NaOH solution is determined. Concentration in mol/dm3 divided by volume in dm3 equals the solute amount in mol. There is 0.00250 mol of sodium hydroxide, or 0.100 x 0.0250.KHP has a molecular weight of 204.22 g/mol, so we have 4.166 mmol of KHP after dividing its mass by 0.8508. We require the same amount of NaOH, or 4.166 mmol, to titrate it to the equivalence point. For a volume of 4.166 mmol/(0.2535 mmol/mL)=16.43 mL of NaOH, we require 0.2535 mmol/mL.

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Answer:

The last one

Explanation:

I have done this before

Answer:

Earth's plates moving & colliding against one another.

Ammonia (NH\(_{3}\)) is the gas that will diffuse faster as it has lower molecular weight than CO\(_{2}\).

The rate of diffusion or effusion is explained by Graham's law. According to this law, lighter atoms and molecules will diffuse through the air more quickly than heavier atoms and molecules while a gas's temperature and pressure are kept constant.

The rate of effusion of a gas is the process by which material particles from the confined region gradually start to escape. Think about how a balloon would deflate from the inside out if we made a hole in it, allowing the gas inside to start escaping into the atmosphere. This is referred to as the effusion of gas into the atmosphere.

As ammonia has lower molecular weight than CO\(_{2}\), it will diffuse faster.

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