alpha polonium crystallizes in a simple cubic unit cell with an edge length of 336 pm. what is the density of alpha polonium (in g/cm^3)?

The answer that has the lowest oxygen content at the specified temperature, BeBr2, is option b, making it the correct choice.

The balance pressure of a vapor beyond its liquid (or solid), or the pressure of vapor produced by the evaporate of a liquid (or solid) over a specimen of the liquid (or sturdy) in a closed container, is the evaporation of a liquid.

Depending on the merits of its intermolecular forces, a liquid's vapor pressure is one of its characteristics. Weak molecules make liquids more easily vaporize and have higher vapor pressure. A liquid with higher intermolecular interactions has a lower evaporation rate since it takes longer for it to evaporate.

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When sodium carbonate and magnesium nitrate solutions are combined, a precipitate is created as a result of a double-displacement process. As you balance the chemical equation, make predictions about the reaction's byproducts.

A solid may form when the solutions of two soluble salts are combined. Salts that are insoluble are created during precipitation processes. When magnesium sulfate and sodium carbonate are combined, magnesium carbonate, an insoluble salt, results.

What takes place when sodium carbonate and hydrochloric acid interact? When sodium carbonate is added to hydrochloric acid, a double displacement reaction takes place, resulting in the formation of sodium chloride, water, and carbon dioxide. The sodium carbonate and the two moles of HCl combine to generate carbonic acid.

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Concentration of sliver ions in the solution= 175.3ml*1L/10³*3.50/1L

Concentration of sliver ions in the solution= 0.6135

1) Percent concentration: This is the quantity of solute that dissolves in 100 g of solvent. If a solution's concentration is 20%, we know that there are 20 g of solute in every 100 g of solution. As an illustration, a solution is made by mixing 10 g of salt and 70 g of water. by % mass, determine the solution's concentration.

The Latin argentum and Sanskrit argunas, both meaning "bright," are where the word "Ag" originates. Even in the Stone Age, silver was used. Silver use dates back at least 5000 years, according to archeological findings.

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The mole fraction of the krypton is 0.27.

We know that in this case there is a mixture of gases and the gases that are mixed here are krypton gas and xenon gas. There are different number of moles of each of the gases that can be found in the mixture.

Now we have the idea that;

Total pressure of the gases =  6.69 atm

Partial pressure of Kr = ?

Partial pressure of Ar = 2.99 atm

Partial pressure of  Xe =  1.92 atm

Partial pressure of Kr = 6.69 - (2.99 + 1.92)

= 1.78 atm

Partial pressure = Mole fraction * Total pressure

Mole fraction  = Partial pressure/Total pressure

Mole fraction  =  1.78 atm/6.69 atm

= 0.27

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The calculated concentration of the H₂SO₄ solution is 0.20 M.

Firstly, we can calculate number of moles of LiOH that are present in the 83.6 mL of 0.12 M LiOH solution.

Volume in mL = 83.6 mL

Volume in litres = 83.6 / 1000 = 0.0836 L

Molarity of LiOH = 0.12 M

Now, to calculate the moles of LiOH 83.6 mL of 0.12 M LiOH solution, formula is:

Mole = Molarity × Volume

So, Moles of LiOH = 0.12 × 0.0836 = 0.010032 moles

Next, we have to calculate the amount of H2SO4 required to react with 0.010032 moles of LiOH:

2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O

From the above balanced equation, it can be said that 2 moles of LiOH reacted with 1 mole of H₂SO₄. Thus,

The number of moles of H₂SO₄ that are required to react with 0.010032 moles of LiOH = 0.010032 / 2 = 0.005016 mole of H₂SO₄

Now, finally, we will calculate the molarity of H₂SO₄:

Molarity = Mole / volume

Mole of H₂SO₄ = 0.005016 mole

Volume = 25 mL = 25 / 1000 = 0.025 L

On putting these values in the molarity formula-

Molarity of H₂SO₄ = 0.005016 moles / 0.025 L

Molarity of H₂SO₄ = 0.20 M

Hence, the unknown concentration of H₂SO₄ is found to be 0.20 M.

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The change in pressure of the gas is; ΔP = 2899.5 Pa

We are given:-

Volume of Monatomic ideal gas(V) = 1.2 m³

Amount of heat added (Q) = 5.22 × 10³ J

number of moles (n) = 3

The change in pressure will be calculated from the formula:-

Where R is a constant = 8.314 J/mol.K

ΔT is the change in temperature

ΔP = (n × R × ΔT)/V

ΔP = (3 × 8.314 × 139.5)/1.2

ΔP = 2899.5 Pa

What is ideal gas?

Ideal gas does not lie in reality. It is a hypothetical gas proposed to simplify the computation. An ideal gas is a theoretical gas composed of a set of randomly-moving point molecules that interact only through elastic frictions.

The change in pressure of the gas is; ΔP = 2899.5 Pa

We are given:-

Volume of Monatomic ideal gas(V) = 1.2 m³

Amount of heat added (Q) = 5.22 × 10³ J

number of moles (n) = 3

The change in pressure will be calculated from the formula:-

Where R is a constant = 8.314 J/mol.K

ΔT is the change in temperature

ΔP = (n × R × ΔT)/V

ΔP = (3 × 8.314 × 139.5)/1.2

ΔP = 2899.5 Pa

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0.45 moles of carbon dioxide are needed to produce 0.075 mol of glucose.

6CO2 + 6H2O ===> C6H12O6 + 6O2 ... balanced equation

0.075mol glucose x 6 mol CO2/1 mol glucose = 0.45 moles CO2 needed (2 large figures).

At some stage in photosynthesis, vegetation absorb carbon dioxide (CO2) and water(H2O) from the air and soil. In the plant cellular, the water is oxidized, which means it loses electrons, even as the carbon dioxide is decreased, which means it gains electrons.

Photosynthesis converts radiant or suns electricity into chemical energy. The productivity of agricultural crops without delay depends upon the rate of photosynthesis. It presents oxygen in the environment for all living organisms.

Photosynthesis is a natural system by using which trees and flowers use energy from the sun and carbon dioxide from the air to make the food they want to live and develop.

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Answer:

B. Convection within the mantle is bringing magma up to the crust in the middlw of the Atlantic Ocean,building new sea floor. Do you have mrs cogliati?

Explanation:

i have it 4 mrs.cogliati

The balanced chemical equation form of the following equation is Br₂ + 2S₂O₃²⁻ + 10H₂O ⇒ 2Br⁻ + 4SO₄²⁻ + 2OH⁺.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.

It's necessary to balance a chemical equation and a chemical reaction. This is so that it can convey how many moles are reacting and creating. The amount of electron that are transferred from one substance to another is also indicated.

Thus, balanced chemical equation is 2S₂O₃²⁻ + 10H₂O ⇒ 2Br⁻ + 4SO₄²⁻ + 2OH⁺.

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800 ml of water should be used to dissolve 203.3 g of MgCl2 • 6H2O. Using water, adjust the volume to 1 liter. Create aliquots and autoclave to sterilize. It should be noted that MgCl2 is highly hygroscopic.

Therefore, the given mass is equal to the number of moles divided by the given mass will be equal to the number of moles multiplied by molar mass, so the number of moles was 250 multiplied by 10 to the power minus 6 multiplied by molar mass, which is given in the question, so mass required, will be 0.0149 gram.

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Three stages are required to transform benzaldehyde into 2-phenyl acetonitrile.

A benzene ring with a formyl substituent makes up the chemical molecule known as benzoaldehyde. It is both the most readily used industrially and the most straightforward aromatic aldehyde. A benzene ring with a formyl substituent makes up the chemical molecule known as benzoaldehyde (C6H5CHO). It is both the most readily used industrially and the most straightforward aromatic aldehyde. It is a clear liquid with a distinct almond-like scent.

In addition to batteries, acetonitrile is used to create perfumes, rubber goods, insecticides, acrylic nail removers, and medications. Fatty acids are also extracted from both vegetable and animal oils using this method. Employees should receive safe handling and storage instructions prior to working with acetonitrile.

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As bond number increases (double bonds rather than single, triple rather than double etc. ), bond length decreases and bond energy increases

Reason-Charges that are spaced apart are described by a dipole moment. There are two critical criteria that must be taken into account when assessing if a molecule has a dipole moment. It must first possess polar covalent bonds. The individual dipoles must not cancel out in the molecular structure, which is the second requirement. Because Br2 is not a polar molecule, it lacks a polar covalent bond.A  bond number is a simple addition of two numbers that total the sum. Using number bonds, one can quickly determine the answer without performing any calculations. We can see from the example that when we see a number bond, we know the answer without having to calculate.

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The number of moles that the sample which occupies a volume of 45.1 L at STP contains is 1.2 moles.

At STP,

P = 1atm

T = 273 K

Given,

V = 45.1 L

R = 0.0831 kJ/mol K

By ideal gas law,

PV = nRT

Substituting the values and solve the equation to obtain the value of n,

45.1 × 1 = n × 0.0831 × 273

⇒ n = 45.1/22.6863

⇒ n = 1.2 moles

Hence, the number of moles of the gas is 1.2 moles.

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Moralizing and ridiculing are both behaviors that can lead to a power struggle rather than effective communication.

When someone moralizes, they are trying to dictate the morality of a situation and put their own values above others. This can lead to feelings of superiority and can make the other person feel like they are being judged or judged unfairly.

Similarly, when someone ridicules someone else, they are attempting to make the other person feel inferior and belittled. This can make the other person feel attacked and can lead to a power struggle as they attempt to regain their sense of power and control.

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C₂H₅OH(l) + 3O₂(g)  →  2CO₂(g) + 3H₂O(l)

For complete combustion of ethanol, the amount of heat produced as measured in the bomb calorimeter is 1364.4kJ/mol at 25° C . The enthalpy of combustion for the reaction will be -1366.95kJ/mol

The combustion equation can be balanced as follows;

Firstly i had counted all the carbons, hydrogens and oxygens on the reactant sides as follows;

C= 2           H= 6          O= 3

and on the product side as follows;

C= 1             H= 2           O=3

Then I balanced the equation by multiplied the reactants and the products with suitable coefficients.

C₂H₅OH + 3O₂  →  2CO₂ + 3H₂O

Now the given equation is balanced because it has all the reactants and products in same amount as

C= 2            H= 6             O= 7

The same concentration of Carbon, hydrogen and oxygen is present on both reactants and products side.

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According to the question, SO2 is the best description of electron distribution in Lewis structure.

When we draw Lewis structures, sometimes the electrons are shared in a way which seems "unfair." For instance, in (CH3)3NO, to give N 8 electrons (and not more, since N can't have more than 8), we have to draw a single bond to oxygen. If we see a reaction between (CH3)3N and an oxygen atom, both electrons that form the bond to O come from N (the former lone pair). (This is a rare example of a reaction that is both a Lewis acid-base reaction and a redox reaction.) However, once the bond is made, these electrons are shared. If you imagine that they are shared equally, then there is a single positive charge on N and negative charge on O. These are called formal charges.

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1.6 moles of reactant will be in excess .

What is reactant?
A reagent, also known as an analytical reagent, is a substance as well as compound that is added to a system in order to trigger a chemical reaction or determine whether one has already occurred. Although the words "reagent" and "reactant" are frequently used interchangeably, "reactant" refers to a substance that is consumed during a chemical reaction. Even though they are part of the reaction's mechanism, solvents aren't typically referred to as reactants. Catalysts aren't reactants either because they aren't used up in the reaction. Reactants are frequently referred to as substrates in biochemistry, particularly in relation to enzyme-catalyzed reactions.

By using stoichiometric ratio
5 moles of o2 required to react with 4 moles of nh3
1 moles of o2 required = 4/5 moles of nh3

Here,
When we have 3 moles of o2
then 3 moles of o2 required =  4/5 x 3
                                              = 12/5 moles
                                              = 2.4 moles
then excess of moles of nh3 will be 4 - 2.4 = 1.6.

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Five electron groups are engaged in the triangular bipyramidal structure, resulting in sp3d hybridization. The orbital angles are 90° and 120°.

The result is that the VSEPR theory, in which three atoms give an electron pair and create a trigonal bipyramid with angles of 120° and 108°, can explain sp3d hybridization.

The only conceivable molecule geometry for sp3d hybridised centre atoms is trigonal bipyramidal. Trigonal bipyramidal shape is likewise the result if all bonds are present.

There is sp3d hybridization in SF4. Five bonds encircling a single phosphorus correspond to sp3d hybridization in PF5. Six bonds are arranged around one sulphur in SF6 to coincide with sp3d2 hybridization. As you can see, the hybridization produces the same amount of bondable hybridised orbitals regardless of the number of orbitals employed in the process.

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If there is exactly one molecule of solute in one liter of solution, the concentration is 1.66x10^-24 M.

Subtract the empirical formula mass from the molar mass of the compound. The outcome must be a whole number or a number that is very close to a whole number. The molecular equation is the end result.

Briefing:

A mole is defined as6.02x10^23 particles, or molecules in this case. Utilize this connection as a conversion factor:

(One mole/6.02x10^23 molecules)

When there is only one molecule present, use the following conversion factor to determine the solute's moles:

(1 molecule) / (1 mole) / (6.02x10^23 molecules) = 1.66 x 1024 moles.

When the molecules cancel, only moles are left.

The number of moles of a solute per liter is concentration by definition. Divide the 1.66x10^-24 moles by the 1.0L volume to get the following result:

1.66x10-241.66x10^-24 molar, or 1.66x10^-24 M, is the result of dividing 1.66x10^-24 moles of solute by 1.0 liter.

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The molar absorptivity of the solution is 47.12 M⁻¹ cm⁻¹.

According to Beer-lamberts law absorbance (A) is  directly proportional to path length (l) and concentration of the solution (C) .

It is given by the formula:

A = e x l x C ..........(1)

Where, e = molar absorptivity constant .

In the question we are given :

A = 0.589

C = 2.50 x 10⁻³ M

l = 5.00 cm

Putting these values in equation 1 we get:

0.589 = e x (2.50 x 10⁻³ M x 5 cm)

Or, e = (0.589 / (1.25 x 10⁻²) M⁻¹ cm⁻¹

Or, e = 47.12 M⁻¹ cm⁻¹ .

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The given reaction equation for photosynthesis whereby, in the presence of light energy from the Sun and chlorophyll, plants synthesize glucose from carbon dioxide and water.  As water is present as a reactant, it doesn’t also appear on the ’products’ side of the equation. So:

Water + carbon dioxide > glucose + oxygen.

As glucose contains 6 carbon atoms, these must be obtained from 6 molecules of CO2. So, overall:

6CO2(g) + 6H2O(l) > C6H12O6(aq) + 6O2(g).

What is photosynthesis?

Photosynthesis is the process  plants and other organisms use to convert light energy into chemical energy, which is later released through cellular respiration to power the activity of the organism.

Therefore, This is the equation for photosynthesis whereby, in the presence of light energy from the Sun and chlorophyll, plants synthesize glucose from carbon dioxide and water.

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To form sigma ( σ ), hybrid orbitals cross each other. To create pi (π) bonds, unhybridized orbitals cross one other.

A model that combines the atomic orbitals of a single atom in a way that creates a new set of orbitals with geometries suitable for forming bonds in the directions suggested by the VSEPR model produces hybrid orbitals. Geometries that are remarkably similar to those observed in actual molecules are predicted by the VSEPR model. Hybrid orbitals are the new orbitals produced as a result of this process. More importantly, hybrid orbitals can be used to explain atomic bonds' properties as well as molecular geometry. For instance, four single bonds are created when the valence-shell s orbital of carbon joins with three valence-shell p orbitals.

Linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral are the five fundamental hybridization shapes. The orbital arrangement's geometry: Linear: Due to the involvement of two electron groups and the 180° angle between the orbitals, sp hybridization results.

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The half-life of the radioisotope is 8 hours.

What do you mean by half-life?

Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive.

How do you calculate half-life decay?

The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T1/2, and the decay constant is given by T1/2 = 0.693/λ.

The half-life of the radioisotope is 8 hours.

Half life=total life/2

Half life=16/2

Half life=8 hours

Thus, the half-life of the given radioisotope is 8 hours.

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If 60 g of a radioactive source voluntarily declines to 15 g within 16 hours, the radioisotope's half-life is 8 hours.

The quantity of protons with in atomic nuclei of component atoms of the same chemical is the same, but the neutron count varies. The radioactive materials of an element are called radioisotopes. They can alternatively be described as atoms with excess electricity in their nucleus or unstable neutron-proton combinations. Actual radiation levels are reported using the Contributes to the ongoing (Bq), the global unit, or the Cobalt (Ci), official machine in the U. S.. Alternative photodiode varieties may be used instead of gamma counters, which are widely used to measure environmental parameters.

Half life = total life/2

Half life = 16/2

Half life = 8 hours

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Scientists made significant contributions to our understanding of the structure and function of DNA. Place the scientists' names in the correct chronological order, starting with the first scientist(s) name to make a contribution.

Hershey and Chase used which of the following facts to try to ascertain whether the genetic material is protein or DNA: protein does not contain phosphorus.

Avery, McCarty, and MacLeod tried to be investigators and were responsible for the following discovery the S cell chemicals that had been destroyed by heat were purified. Live R cells were used to examine the compounds' potential for transformation. DNA turned out to be the transformative agent.

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The acetic acid in vinegar has a molar concentration of 0.530 M.

How much molar concentration is there?

When the chemical formula and molecular weight of the drug are known, the concentration can be calculated. Any substance's molar concentration in a solution can be simply calculated.

Molar concentration is the measurement of a solution's concentration as the No.  of moles of a solute inside a liter of a solution.

The following equation can be used to compute the concentration or volume of the solutions:

M₁V₁ = M₂V₂

where M1, V1, M2, and V2 represent the volume and concentration of the concentrated & diluted solution, respectively.

Given a NaOH concentration, M1 = 0.1931 M (which should be necessary to apply the broth dilution),

and to calculate the molar concentration of acetic acid)

The volume of NaOH, V1, is 27.48 mL.

V2 = acetic acid volume in milliliters

In equation (1), substitute the values of V1, M1, and V2 as well as volume:

(0.1931) X (27.48) = (10) X (V₂)

V₂ = 0.530 M

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The products formed from (z)-3-methylhex-3-ene and (e)-3-methylhex-3-ene in hydroboration oxidation are the same; the only difference is that the stereochemistry of the products will be different.

The (z)-3-methylhex-3-ene will produce a product with the hydrogens on opposite sides, while the (e)-3-methylhex-3-ene will produce a product with the hydrogens on the same side. They are diastereomers.

The hydroboration oxidation reaction involves the addition of a borane (BH₃) and an oxidant (usually H₂O₂) to an alkene. The borane adds to the alkene double bond to create a new carbon-boron bond, and the oxidant adds oxygen to the boron, forming a boroxine and releasing a proton.

The product of this reaction is alcohol. Since both (z)-3-methylhex-3-ene and (e)-3-methylhex-3-ene are the same alkene, the reaction mechanism and products are the same; the only difference is the stereochemistry.

The (z)-3-methylhex-3-ene will produce a product with the hydrogens on opposite sides, while the (e)-3-methylhex-3-ene will produce a product with the hydrogens on the same side.

In summary, the products formed from (z)-3-methylhex-3-ene and (e)-3-methylhex-3-ene in hydroboration oxidation are the same, but the stereochemistry of the products is different.

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In order for 0.36 mol of lead to totally react, 0.72 mol of Hydrochloric acid is required.

In the food, textile, metal, or rubber sectors, hydrogen chloride (HCl) is frequently employed as a bleaching agent to neutralize alkaline substances. When discharged into the soil, it is neutralized, and when it comes into contact with water, it hydrolyzes quickly.Low concentrations exposed over an extended period of time may damage and stain teeth. The EPA has not rated the carcinogenicity of hydrochloric acid.

Chemical burns from hydrochloric acid can be extremely painful if they come into contact with epidermis or other tissues. Ingestion of hydrochloric might result in blindness. The amount of acid present determines how severe the burns.

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In 2.6*10² ms, a sample of radon-218 will deteriorate from 99 grams to 0.50 grams. The half-life of radon-218 is 35 milliseconds.

The only significant, carbon-free energy resource that the nation can extensively expand to produce significant amounts of power is nuclear energy. When fossil fuels are burned to produce the same number of electricity, nuclear power plants avoid producing a sizable amount of emissions. One of the best instances of nuclear fusion seems to be the sun. Helium is created when hydrogen nuclei combine inside the sun, producing thermal energy which warms the Earth..

t = 2.303/R log A₀/A

Hence, R = 0.693/t/2

t = 2.303/0.693*35 log 99/0.5

t = 267ms

= 2.6*10² ms

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This molecule has been bent. The shape of angular molecules, also known as bent or V-shaped molecules, is non-linear.

Take water (H2O), for instance, which has an angle of roughly 105°.

Two double bond units and one lone pair make up the structure, which will take the form of a trigonal planar arrangement. SO2 is referred to be bent or V-shaped because the lone pair is ignored when describing the shape.

Therefore, if two electron pairs are paired but are not utilised in chemical bonding, they are referred to as lone pairs. As a result, the amount of valence electrons surrounding an atom is equal to the sum of the electrons in lone pairs and those in bonds.

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