given that the electronic configuration of an element X is 1s2 2s2 2p6 3s2 3p4,it can be deduced that X:
a. belongs to group VI in the periodic table
b. belongs to period 4 in the periodic table
c. contains 3 unpaired electrons in the ground state
d. has atomic number 27​

Answer:Main Answer:

The mass of CO2 released in the production of 123,000 g of H2 gas is 265,200 g.

Explanation: From the given equation, we can see that the production of 4 moles of H2 requires the combustion of 1 mole of CH4, resulting in the release of 2 moles of H2O and 1 mole of CO2. The molar mass of H2 is 2 g/mol, and the molar mass of CO2 is 44 g/mol. Therefore, the mass of CO2 released in the production of 123,000 g of H2 is (123,000/2) x (1/4) x 44 = 265,200 g.

Answer: Atoms are made of dust because God made us with dust.

Explanation:

Your Question is complete but the options are very much confusing and contradicting. Below you will find the true and full content.

The correct answer for the given question about Enthalpy of vaporisation is ( Volume of liquid in L x 1000 g/L x ΔHvap cal/gm ) where ΔHvap = 540 cal/gm (in case of water).

The amount of energy (enthalpy) required to convert a portion of a liquid into a gas is known as the enthalpy of vaporisation, abbreviated as ΔHvap  and also referred to as the latent heat of vaporisation or heat of evaporation.

Let E be the energy required to calculate the energy required to vaporise a volume of liquid.

Then,

E = Volume of liquid in L x Density of liquid in gm/L  x ΔHvap in cal/gm

and E will came out in calorie.

E = Volume of liquid in L x 1000 g/L x 540 cal/gm --- (in case of water)

Thus we can conclude that to calculate the energy required to vaporise a volume of liquid, we can use the formula with ΔHvap which is E = (Volume of liquid in L x Density of liquid g/L x ΔHvap cal/gm ) and the answer will be in calorie.

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When soda is exposed to room temperature, the carbon dioxide molecules that give it its fizziness start to escape. This process is known as carbonation loss.

As carbon dioxide escapes, the soda becomes less carbonated and loses its characteristic fizziness. This change in carbonation levels affects the taste of the soda, making it taste flat and less refreshing. The loss of carbon dioxide also affects the texture of the drink, making it feel less bubbly in the mouth. To prevent carbonation loss, it is recommended to store soda in a cool, dark place, such as a refrigerator, to keep it fresh and maintain its carbonation levels.

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Answer:c

Explanation:

The electronic structure is defined by the movement of the electrons in the electrostatic field when the nuclei are in a stable state. It depicts both the energy and the wave function.

The electronic structure is the representation of the electrons, a sub-atomic particle in the orbitals and sub-shells of the atom. They follow various rules and principles to fill their energy levels.

The electronic structure depicts the electronic arrangement and organization within the atom and shows its property of electronegativity and size.

Therefore, the electronic structure is the arrangement of the electrons in the orbit.

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Answer:

No and yes

Explanation:

Xenon is a noble gas and beryllium is a metal

Answer: no and yes i also agree

Xenon is a noble gas and Beryllium a metal

Explanation:

The no of moles of carbondioxide that can be produced from 3.2 moles of glucose is 6.4 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, glucose decomposes into ethanol and carbondioxide. Based on the equation as in the image, 1 mole of glucose produces 2 moles of carbondioxide.

This means that 3.2 moles of glucose will produce 3.2 × 2 = 6.4 moles of carbondioxide.

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The number of moles of the CO2 that is going to be produced in the reaction is 6.4 moles.

Stoichiometry is a branch of chemistry that deals with the quantitative relationship between reactants and products in chemical reactions.

We have to note that we have to apply the stoichiometry of the reaction so that we can be able to solve the problem that we have in the case that we are dealing with here.

We know that;

1 mole of glucose produces 2 moles of CO2

3.20 moles of glucose  will produce 3.2 * 2/1

= 6.4 moles of CO2

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The mass of an equal volume of methane (CH4) at RTP (room temperature and pressure) can be calculated using the molar mass of carbon dioxide (CO2) and methane.

To find the mass of an equal volume of methane at RTP, we need to compare the molar masses of carbon dioxide and methane. The molar mass of carbon dioxide (CO2) is calculated as the sum of the atomic masses of carbon (C) and two oxygen (O) atoms, which is approximately 44 grams per mole. Since carbon dioxide and methane have the same volume at RTP, we can use this information to find the mass of methane.

The molar mass of methane (CH4) is the sum of the atomic mass of carbon (C) and four hydrogen (H) atoms. Carbon has an atomic mass of approximately 12 grams per mole, and hydrogen has an atomic mass of approximately 1 gram per mole. Therefore, the molar mass of methane is approximately 16 grams per mole.

Since the volume of carbon dioxide and methane is equal at RTP, we can infer that the mass of an equal volume of methane would also be equal to 29.1 grams.

In summary, the mass of an equal volume of methane at RTP would be approximately 29.1 grams.

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The volume of the object is 8 cm³ and the density of the object is 3 g/cm³.

Archimedes' principle states when an object is partially or fully immersed in a fluid, it displaces the portion of the fluid equal to its own weight.

The volume of the object = volume of the water in the cylinder displaced

volume of the object = 30 cm³ - 22 cm³

volume of the object = 8 cm³

The density of the object is calculated from the ratio of the mass and volume of the object.

density = mass/volume

density of the object = 24 g / 8 cm³

density of the object = 3 g/cm³

Thus, the volume of the object is 8 cm³ and the density of the object is 3 g/cm³.

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IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.

IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.

The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.

Therefore, the compounds are ethane, butane, and butene.

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\(\\ \tt\Rrightarrow Velocity=\dfrac{Distance}{Time}\)

\(\\ \tt\Rrightarrow Velocity=\dfrac{1.6}{1.4}\)

\(\\ \tt\Rrightarrow Velocity=8/7=1.1km/h\)

Answer:

velocity = 0.3175 m/s

Explanation:

given:

conversion:

1 km ↔ 1000 m

1.6 km ↔ 1600 m

        and

1 hours ↔ 3600 seconds

1.4 hours ↔ 5040 seconds

The distance is 1600 m and time is 5040 seconds. this was done as velocity is asked as * m/s *

solve:

\(velocity = \dfrac{distance}{time}\)

\(velocity = \dfrac{1600}{5040}\)

\(velocity = 0.3175\)

Answer:

Cells are made of several parts that work together.

Explanation:

It is this because bacteria are made of 1 cell, unicellular. All living things do not have to have more than 1 cell proven by bacteria which has one cell. And cells are living meaning it has to make up living things.

Hope this helps:)

Answer:

Option 3

Explanation:

Cells are made up of several parts (Organelles) that work together resulting in the functioning of the cell which further results in the functioning of the whole body.

Answer:

Sry i accidently clicked on ''SAVE''.

U can remove it or report it...

Explanation:

The attributes of the genetic code include all of the following except B. Each codon specifies more than one amino acid.

A. Each codon consists of 3 nucleotides: This is a correct attribute of the genetic code. Codons are made up of three consecutive nucleotides, which form the basic unit of the genetic code.

B. Each codon specifies more than one amino acid: This is incorrect. Each codon typically specifies only one amino acid. However, there are some exceptions called "ambiguous codons" where a single codon can code for more than one amino acid, but they are relatively rare.

C. Codons are non-overlapping: This is a correct attribute of the genetic code. Codons are read sequentially and are not overlapping. Each codon starts at a specific position in the DNA or mRNA sequence.

D. Most amino acids are specified by more than one codon: This is a correct attribute of the genetic code. With a few exceptions, most amino acids are encoded by multiple codons. This redundancy provides some level of error tolerance and allows for variations in the DNA sequence without affecting the encoded protein.

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Answer:

Ash and dust fill the air and reduce sunlight.

Explanation:

Ash and dust comes out of volcanoes, and it is bad for the environment. Polluting the air and causing fogginess, it also reduces sunlight.

Answer:

d

Explanation:

If Ka for HBrO is 2. 8×10^−9 at 25°C, then the value of Kb for BrO− at 25°C is 3.5× 10^(-6).

The base dissociation constant (Kb) is defined as the measurement of the ions which base can dissociate or dissolve in the aqueous solution. The greater the value of base dissociation constant greater will be its basicity an strength.

The dissociation reaction of hydrogen cyanide can be given as

HCN --- (H+) + (CN-)

Given,

The value of Ka for HCN is 2.8× 10^(-9)

The correlation between base dissociation constant and acid dissociation constant is

Kw = Ka × Kb

Kw = 10^(-14)

Substituting values of Ka and Kw,

Kb = 10^(-14) /{2.8×10^(-9) }

= 3.5× 10^(-6)

Thus, we find that if Ka for HBrO is 2. 8×10^−9 at 25°C, then the value of Kb for BrO− at 25°C is 3.5× 10^(-6).

DISCLAIMER: The above question have mistake. The correct question is given as

Question:

Given that Ka for HBrO is 2. 8×10^−9 at 25°C. What is the value of Kb for BrO− at 25°C?

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The correct answer is B. NaHCO3 (sodium bicarbonate) is soluble in water because NaHCO3 is an ionic compound with polar characteristics, allowing it to dissolve in the polar solvent water..

Water is a polar solvent, meaning it has a partial positive and negative charge due to the uneven distribution of electrons between the hydrogen and oxygen atoms. Hexane (C6H14), on the other hand, is a nonpolar solvent, meaning it lacks any significant charge separation.
Solubility of a solute is determined by the principle "like dissolves like," which means that polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.
The other options are incorrect because:
A. CaCl2 (calcium chloride) is soluble in water, not hexane, due to its polar nature as an ionic compound.
C. Octane (C8H18) is nonpolar and soluble in nonpolar solvents like hexane, not in polar solvents like water.
D. Mineral oil is nonpolar and soluble in nonpolar solvents, not in polar solvents like water.

Therefore, NaHCO3 (sodium bicarbonate) is soluble in water (Option b). This is because NaHCO3 is an ionic compound with polar characteristics, allowing it to dissolve in the polar solvent water.

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Answer:

nope its a myth don't worry :)

Answer:

Inorganic compounds is typically chemical compound that lacks carbon hydrogen bonds.

Explanation:

The property of alcohols that is not affected by hydrogen bonding is molecular weight. Hydrogen bonding is a type of intermolecular force that occurs between hydrogen atoms and highly electronegative atoms such as oxygen, nitrogen, or fluorine. Alcohols have an -OH group, which makes them capable of hydrogen bonding. When alcohols undergo hydrogen bonding, the intermolecular attraction between the molecules increases, which affects various properties of alcohols.

Boiling point and miscibility with water are two properties of alcohols that are affected by hydrogen bonding. Due to the stronger intermolecular forces caused by hydrogen bonding, alcohols have higher boiling points and are more soluble in water.

The ability of alcohols to dissolve polar substances is also affected by hydrogen bonding. Alcohols are able to dissolve polar substances such as sugars, aldehydes, and ketones because of the polar -OH group and the ability to form hydrogen bonds with other polar molecules.

However, molecular weight is not affected by hydrogen bonding. The molecular weight of an alcohol is determined by the sum of the atomic weights of its constituent atoms. It is not influenced by the presence or absence of hydrogen bonding. Therefore, the correct answer is option E, none of the above.

In summary, hydrogen bonding affects the boiling point, miscibility with water, and ability to dissolve polar substances of alcohols, but it does not affect their molecular weight.

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Answer: Mg is a cation and Cl is an anion

Explanation: In more detail, if you look at the periodic table, the group number (or columns) of the elements, describe how many valence electrons, or how many electrons the element has available to have a complete an electron shell. Magnesium being in group 2, it has one 2 electrons that will be "donated" to an anion that it bonds with. However, Chlorine being in group 17, (look at the single digit number for double digit groups), it has 7 valence electrons. Knowing that a full electron shell is usually 8 electrons, it needs only one. Since Magnesium has 2 valence electrons to give away, two atoms of Chlorine gas will then bind to the Magnesium, where the 2 Chlorine atoms will take the electrons to fill their shells. Magnesium Chloride, in terms of charges when in ions, [Mg]2+ and 2 [Cl]-1

Magnesium chloride is formed when magnesium ion formed from the loss of two electrons and two chloride ions formed by accepting one electron each are held together by electrostatic attractive forces.

Magnesium chloride is an ionic compound which consists of magnesium ions and chloride ions.

Therefore, magnesium chloride is formed when magnesium ion formed from the loss of two electrons and two chloride ions formed by accepting one electron each are held together by electrostatic attractive forces.

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A. An element with the valence electron configuration 3s1 would form a monatomic ion with a charge of +1 In order to form this ion, the element will lose 1 electron from the 3s subshell.

B. If an element with the valence configuration 4s23d6 loses 2 electrons this electron would be removed from the 4s subshell.

Valence configuration 3s1 corresponds to sodium. The element with the above electron configuration is IRON. Iron is an element with atomic number 26. Atomic valence is also called valence. In chemistry, the property of an element determines how many other atoms an element's atoms can bond with.

Introduced in 1868, this term describes both the associativity and associativity numbers of common elements. A valence electron is an electron in the outermost shell or energy level of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

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The total volume of the solution is 1005 mL after adding 5 mL of 0.50 M HCl, we can assume that the volume change is negligible, and the concentrations of HA and A- remain the same.

A buffer typically consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer's ability to resist changes in pH comes from the equilibrium between the weak acid and its conjugate base.

To calculate the pH after adding 5.0 mL of 0.50 M HCl to 1 liter (1000 mL) of the buffer solution, we need to consider the buffer's composition and the effect of the added acid.

Since you haven't provided the exact composition of the buffer, I'll assume it consists of a weak acid and its conjugate base. Let's denote the weak acid as HA and its conjugate base as A-. The buffer is designed to resist changes in pH when small amounts of acid or base are added.

When HCl is added, it will dissociate into H+ and Cl- ions. The H+ ions from HCl will react with the conjugate base A- in the buffer, forming the weak acid HA. This reaction helps maintain the pH of the buffer.

To calculate the pH after the addition of HCl, we need to know the initial concentrations of HA and A- in the buffer and the pKa of the weak acid HA. With this information, we can use the Henderson-Hasselbalch equation:

pH = pKa + log ([A-]/[HA])

Given that the total volume of the solution is 1005 mL after adding 5 mL of 0.50 M HCl, we can assume that the volume change is negligible, and the concentrations of HA and A- remain the same.

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After adding 5.0 mL of 0.50 M HCl to 1 liter of a buffer solution with an initial concentration of 0.10 M and a \(pKa\) of 5.0, the pH of the buffer will be determined using the Henderson-Hasselbalch equation: \(pH = 5.0 + log([0.10 M + (0.50 M x (5.0 mL/1005 mL))]/[0.10 M])\).

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation, which is \(pH = pKa + log([A-]/[HA])\).
In this case, 5.0 mL of 0.50 M HCl is added to 1 liter of the buffer solution, resulting in a total volume of 1005 mL. To calculate the pH, we need to know the \(pKa\) value of the buffer and the concentrations of the acidic form \(([HA])\) and the conjugate base \(([A-])\).
Let's assume the \(pKa\) of the buffer is 5.0. We can use the equation to calculate the ratio \([A-]/[HA]\). Since the concentration of HCl added is much higher than the initial concentration of the buffer, we can assume that the concentration of [HA] remains approximately the same. Therefore, the concentration of [A-] will be equal to the initial concentration of the buffer plus the concentration of HCl added.
Let's say the initial concentration of the buffer is 0.10 M. After adding 5.0 mL of 0.50 M HCl, the concentration of [A-] would be 0.10 M + (0.50 M x (5.0 mL/1005 mL)).
Now, substitute the values into the Henderson-Hasselbalch equation: \(pH = 5.0 + log(([A-]/[HA]))\). Calculate the ratio \([A-]/[HA]\) and substitute it into the equation to find the \(pH\).
This calculation will give you the pH of the buffer solution after adding the HCl.

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Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.

The correct answer is D. 100 mL × 1g divided by 1mL × 1mol divided by 18.02g × 4.186 kJ/mol = 23.2 kJ

To calculate the energy required to boil 100 mL of water, we need to use the specific heat capacity of water, which is approximately 4.186 J/g·°C. The molar mass of water is 18.02 g/mol.

First, we convert the volume of water from milliliters to grams:

100 mL × 1 g/1 mL = 100 g

Then, we calculate the number of moles of water:

100 g × 1 mol/18.02 g = 5.548 mol

Finally, we multiply the number of moles by the molar heat of vaporization of water, which is approximately 40.65 kJ/mol:

5.548 mol × 4.186 kJ/mol = 23.2 kJ

Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.

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Answer: The answer is 1004.53242

Explanation:

Answer:

4.532421×10^-3

Explanation:

4.532×10^-3 + 0.000421

4.532421×10^-3

The volume of the solution in the container was 282 dm³ for the solution of ammonium Sulphate fertilizer to be applied to the soil before planting some seeds.

To solve this problem, we need to use the reaction between barium chloride and sulfate:

BaCl2 + (SO4)²- → BaSO4 (precipitate)

First, we need to find the number of moles of sulfate in 0.20dm³ of the solution.

This can be done by using the concentration of barium chloride:

0.35\(moldm^{-3}\) × 0.28dm³ = 0.098 moles of sulfate

We need to find the number of moles of ammonium sulfate in the container.

This can be done by using the mass of ammonium sulfate:

3.68 kg × (1000 g / 1 kg) × (1 mole / (132.14 g/mol)) = 27.68 moles of ammonium sulfate

Now that we have the number of moles of ammonium sulfate, we can find the volume of the solution in the container:

27.68 moles / 0.098 moles/dm³ = 282 dm³.

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The question is -

A solution of ammonium sulfate fertilizer was to be applied to the soil before planting some seeds. A given volume of water was put in a large container and 3.68kg of fertilizer was dissolved in it. On analysis, 0.28dm3 of 0.35moldm-3 barium chloride was required to precipitate all the sulfate in 0.20dm3 of solution. What was the volume of the solution in the container? {H=1, N=14, O=16, S=32}

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.