What is gradient elution from a column, and why is it often advantageous over isocratic elution?

Answer:

P= \(\frac{M}{V}\)

Explanation:

I am assuming you are talking about their phase and in that case, they are mostly solid except for mercury and bromine.

Hope that helps!

Answer:

Explanation:We can use the equilibrium constant (K) and the initial concentrations of the reactants to calculate the equilibrium concentrations of reactants and products using the following ICE table:

| I | C | E |

|-------|--------|--------|

| A | 1.0 -x | 1.0-x |

| B | 1.0 -x | 1.0-x |

| C | 0 +x | x |

| D | 0 +x | x |

At equilibrium, the expression for K is:

K = [C][D]/[A][B]

Substituting the equilibrium concentrations in this expression, we get:

4.0 = x^2/(1.0-x)^2

Solving for x using the quadratic equation, we get:

x = 0.67

Substituting this back in the ICE table, we get the equilibrium concentrations:

[A] = [B] = 0.33 M

[C] = [D] = 0.67 M

The maximum amount of C that can be produced is (1.0 M - 0.67 M) = 0.33 M. The theoretical maximum yield of C is the amount of C produced divided by the amount of C that would be produced if all of the reactants were converted to C and D, which is:

maximum yield of C = 0.33 M / (1.0 M + 0.33 M) = 0.25 = 25%

Therefore, the correct answer is (1) 25%.

Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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The earth’s magnetic poles are in the general direction of the planet’s geographic poles. the phrase "general direction" mean  different and complete opposite way.

A bar magnet that is suspended freely will always point north-south. This is a result of the bar magnet's south pole being drawn to the Earth's magnetic north pole (geographic south).

Geographic and magnetic poles on Earth are generated by various sources, thus they are not perfectly aligned. The outer core's swirling currents of liquid iron are what generate the Earth's magnetic field.

Thus, Option D is correct.

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Answer:

Explanation: The longer the alkyl chain, the less soluble in water is the alcohol. Methanol and ethanol are infinitely miscible in water; propanol and butanol have limited solubility. ... Hydrogen bonding with water thus becomes less viable, and solubility of the long-chain alcohol IN WATER decreases.

Explanation:

Answer:

Atoms have protons and neutrons in the center, making the nucleus, while the electrons orbit the nucleus. The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different.Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Atoms have three particles called protons, electrons, and neutrons. The protons and neutrons are located at the center.

The nucleus of an atom is made up of protons and neutrons, and it is orbited by electrons. According to the current atomic theory, atoms of the same element are the same, whereas atoms of different elements are distinct.

Protons, electrons, and neutrons are the three fundamental particles that make up an atom.

The protons (positively charged particles) and neutrons are found in the nucleus (center) of an atom (no charge). The electrons are located in the outermost portions of the atom, which are known as the electron shells (negatively charged).

Therefore, Atoms have three particles called protons, electrons, and neutrons. The protons and neutrons are located at the center.

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The answer is 975S because u add all ofthem

Answer:

1. Iodine is reduced

2. Iodine is reduced

3. Iodine is oxidized

Explanation:

1. Oxidation number goes from 0 to -16

(oxidation number decreases = reduction)

2. Oxidation  number goes from 0 to -6

(oxidation number decreases = reduction)

3. Oxidation number goes from +2 to 0.

(oxidation number increases; the atom loses electrons = oxidation)

Solid lead nitrate is heated and forms solid lead oxide, gaseous nitrogen dioxide, and oxygen then it form of decomposition reaction

Lead nitrate is a white color inorganic powder with the chemical formula Pb ( NO₃)₂ when Lead nitrate decomposes it produces Lead oxide a yellow colored oxide of  brown colored Nitrogen dioxide gas, and colorless Oxygen gas and also it gives yellow colors

When lead nitrate is heated it decomposes to form lead oxide, nitrogen dioxide and oxygen from the reaction, we can see that lead nitrate decomposes on heating and forms lead oxide, nitrogen dioxide and oxygen thus, lead nitrate on decomposition gives lead oxide, nitrogen dioxide and oxygen and the lead nitrate and when solid lead nitrate heated it decomposes to produce light yellow solid lead monoxide, reddish-brown nitrogen dioxide gas and colourless oxygen gas

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The conversion of 18.2L of He at STP to moles is 0.8125 moles.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. For extremely small objects like atoms, molecules, or other particles, chemists must quantify using moles.

A helpful set of reference conditions is standard temperature and pressure (STP), which can be used to compare various gas properties. Gases have a volume per mole of 22.4 L at STP.

1 mol = 22.4L

So we have 18.2L

18.2L will equal 0.8125 moles.

Therefore, 18.2L of He at STP equals 0.8125 moles when converted to moles.

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The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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Answer:

If a linear graph has a negative slope then dependent value decreases in value as the independent variable increases. The line with negative slope is sloping down to the right

The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

The dry gas would occupy 1.46 L at standard conditions.

When gas is collected over water, the vapor pressure of the water affects the total pressure measured. To account for this, we need to use Dalton's law of partial pressure, which states that the total pressure of a gas mixture is the sum of the partial pressures of each gas component.

First, we need to calculate the partial pressure of the collected gas. We can do this by subtracting the vapor pressure of water at 20 degrees Celsius (17.5 mm Hg) from the total pressure measured:

Partial pressure of gas = total pressure - vapor pressure of water
Partial pressure of gas = 622.0 mm Hg - 17.5 mm Hg
Partial pressure of gas = 604.5 mm Hg

Next, we can use the ideal gas law (PV = nRT) to calculate the volume of the dry gas at standard conditions (0 degrees Celsius and 1 atm):

PV = nRT
V = nRT/P

where P is the partial pressure of the gas (604.5 mm Hg converted to atm), n is the number of moles of gas (which we can calculate using the volume of the collected gas and the known molar volume of a gas at STP), R is the gas constant, and T is the temperature in Kelvin (273 K).

V = (40 L)(0.0821 L·atm/mol·K)(293 K)/(0.793 atm)
V = 1.46 L

Therefore, the dry gas would occupy 1.46 L at standard conditions.

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Answer:

The atom that loses the electrons becomes a positively charged ion, while the one that gains them becomes a negatively charged ion

Answer: The answer is B. The pressure inside the tires increased.

Explanation:

The relationship between the pressure, volume, and temperature of a gas is described by the ideal gas law, which is usually written as:

\($$PV = nRT$$\)

where:

- \(\(P\)\) is the pressure,

- \(\(V\)\) is the volume,

- \(\(n\)\) is the number of moles of gas,

- \(\(R\)\) is the ideal gas constant, and

- \(\(T\)\) is the temperature (in Kelvin).

In this case, the volume \(\(V\)\) and the number of moles \(\(n\)\) of air in the tires stay the same. The temperature \(\(T\)\) is increasing. Therefore, for the equation to remain balanced, the pressure \(\(P\)\) must also increase.

So, the answer is B. The pressure inside the tires increased.

Answer: The mass of a 9.0 cm3 cube of lead is 102.6 g

If you multiply volume with the given density you will get the mass of the lead

here,

The given volume is 9.0 cm3 and the density is 11.4g/cm3

the mass will be (9.0*11.4)g = 102.6 g

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Explanation:

Alkali metals have low melting points, low electronegativity, and low ionization energies.  They are malleable and ductile.  They are also good conductors of heat and energy.

Since they have one electron in their valence, alkali metals are very reactive.  This means that they are not found alone in nature.

NAD+/NADH is the cofactor that participates directly in most of the oxidation-reduction reactions in the fermentation of glucose.

A chemical reaction is a method wherein one or more materials, also called reactants, are transformed into at least one or more special substances, called merchandise. Materials are both chemical elements or compounds.

A few synthesis reactions can result in more than one product. Photosynthesis is one of the maximum important chemical reactions on earth.

Chemical compounds are made from atoms of different elements, joined collectively through chemical bonds. A chemical synthesis normally involves the breaking of existing bonds and the formation of recent ones.

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Answer:

21.16 g

Explanation:

Balance the equation

3 Zn + 2 MoO3 = Mo2O3 + 3 ZnO

And prepare their molar masses

Zn - 65.38

MoO3 - 143.96

Mo2O3 - 239.92

ZnO - 81.38

Since Zn is the limiting reagent; (you can determine this by trial and error but I'm too lazy), basically 29.2 g of MoO3 needs 19.892 g of Zn to react; while 17 g of Zn would need 24.955 g of MoO3 so we have shiet leftover. So we should always use the limiting reagent, in this case,

Zn

as it gets used up completely.

Anyway:
We can now solve using the ratio between Zn and ZnO.
(17 g of Zn /

65.38 g per Zn) x (3 mol of ZnO / 3 mol of Zn) x (81.38 g per ZnO / 1 mol of ZnO) = 21.16 g of ZnO

sooooo you get

21.16 g

(typing this on mobile and kinda hungover so yea)

The given equation is not a chemical equation, it is just a symbol for an element (polonium-208). However, if you are trying to write a balanced nuclear equation involving polonium-208, you would need to specify what kind of nuclear reaction is occurring.The most common type of nuclear reactions are alpha decay, beta decay, and gamma decay. In alpha decay, the nucleus emits an alpha particle, which is a helium nucleus consisting of two protons and two neutrons. In beta decay, the nucleus emits a beta particle, which is an electron or a positron. In gamma decay, the nucleus emits gamma radiation, which is a high-energy photon.If we assume that polonium-208 is undergoing alpha decay, then the balanced nuclear equation would be:

208Po → 4He + 204Pb

In this equation, an alpha particle (4He) is emitted from the polonium-208 nucleus, resulting in the formation of lead-204 (204Pb). Therefore, the particle or type of radiation that needs to be included to balance the equation is an alpha particle (4He).

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Answer:

2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF

Explanation:

AlF₃ + Li₂O —> Al₂O₃ + LiF

The above equation can be balanced as follow:

AlF₃ + Li₂O —> Al₂O₃ + LiF

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 2 before AlF₃ as shown below:

2AlF₃ + Li₂O —> Al₂O₃ + LiF

There are 6 atoms of F on the left side and 1 atom on the right side. It can be balance by writing 6 before LiF as shown below:

2AlF₃ + Li₂O —> Al₂O₃ + 6LiF

There are 2 atoms of Li on the left side and 6 atoms on the right side. It can be balance by writing 3 before Li₂O as shown below:

2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF

Thus, the equation is balanced..!

Answer:

D.  

They have a positive charge and are present in the nucleus of an atom along with the neutrons.

explanation:

Protons have a positive charge.

Answer:

There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas show the simplest whole-number ratio of atoms in a compound, molecular formulas show the number of each type of atom in a molecule, and structural formulas show how the atoms in a molecule are bonded to each other.

In order for AgBr to dissolve through complex ion formation, the reaction quotient (Q) for AgBr must be less than its Ksp value. If not, AgBr dissolution will be exceeded by precipitation, meaning that more solid AgBr will form, making the solution less soluble.

If the reaction quotient for AgBr is greater than its Ksp value, then AgBr will not dissolve through complex ion formation. Instead, the dissolution of AgBr will be exceeded by the precipitation of AgBr, resulting in a decrease in solubility.


On the other hand, if the reaction quotient for AgBr is less than its Ksp value, then complex ion formation can occur, leading to an increase in solubility. In this case, the dissolution of AgBr through complex ion formation will not be exceeded by precipitation, and more AgBr will remain dissolved in the solution.

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The molality of a solid solution containing 867 g of aluminum and 14.9 g of copper is 0.27 mol/kg.

The molality of a solution is a way to express the concentration of the solute in a given mass of solvent.

Molality of solution is given by the formula given below:

In the given solid solution, aluminium is the solvent while copper is the solute.

Mass of solvent = 867 g = 0.867 Kg

Moles of solute = mass/molar mass

molar mass of copper = 64.0 g

moles of solute = 14.9/64 = 0.233 moles

Molality of solution = 0.233 mol/0.867 kg = 0.27 mol/kg.

Therefore, the molality of a solid solution containing 867 g of aluminum and 14.9 g of copper is 0.27 mol/kg.

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Answer:

1) The temperature inside a diesel engine is high enough for two atmospheric gases nitrogen and oxygen to react and combine to form nitrogen oxides, NOₓ

At very high temperatures of above 1,300 °C, which are temperatures obtainable in the internal combusting chamber of a diesel engine under 100% load, air containing N₂ and O₂ is sucked in, and they combine to produce approximately 85% of the NOₓ pollutants produced from moving engine sources

2) a) N₂O contributes to the Greenhouse effect and therefore global warming

b) NO₂ contributes to the formation of smog and NO₂ combines with water to produce nitric acid which falls as acid rain, and causes irritation in the eyes and the respiratory system airways

c) Nitric oxide gas, NO, has the effect of depleting the Ozone layer which increases global warming and increased penetration of UVB

Explanation:

The complete question is as follows: 2 molecules of potassium chlorate (KClO3) form 2 molecules of potassium chloride (KCl) and 3 molecules of oxygen (O2). Write a balanced equation for this reaction?

Answer: The balanced chemical equation is \(2KClO_{3} \rightarrow 2KCl + 3O_{2}\).

Explanation:

A balanced equation is defined as the equation which contains same number of atoms on both reactant and product side when a chemical reaction occurs.

Hence, when 2 molecules of potassium chlorate \((KClO_{3})\) form 2 molecules of potassium chloride (KCl) and 3 molecules of oxygen \((O_{2})\) then its balanced equation will be as follows.

\(2KClO_{3} \rightarrow 2KCl + 3O_{2}\)

Here, number of atoms on the reactant side as as follows.

Number of atoms on the product side are as follows.

Since, the number of atoms on reactant side are equal to the number of atoms on product side. So, this reaction equation is balanced.

Thus, we can conclude that the balanced chemical equation is \(2KClO_{3} \rightarrow 2KCl + 3O_{2}\).

Answer:

Extract DNA from the fertilizer to identify its origin.

Explanation:

Barnes find out that fertilizer was used in the explosive material. Barnes should now identify the origin of this type of fertilizer so that its root can be determined. When the origin is unable to be determined then Barnes should keep the traces of the fertilizer and try to identify the manufacturer.

Answer:

Track down where the fertilizer was sold and who bought it

Explanation:

I, myself, took this exam.

In one mole of sodium carbonate, there are 2 moles of sodium , 6 moles of oxygen and 1 mole of C. Hence, in 1.25 moles of the compound, 2.5 moles of Na, 7.5 moles of O and 1.25 moles of C.

The molar mass of a compound  is the mass of one mole of the compound. One mole of any compound contains 6.02 × 10²³ atoms. This number is called Avogadro number.

2.  Convert 2.50 mol of Na2CO3 to mass in g.

Molar mass of sodium carbonate  = 106 g/mol

then, mass of 2.50 mol = 265 g.

3. Convert 5.50 g of Na2CO3 to mol.

Number of moles in 5.50 g of sodium carbonate = 5.50 g/ 106 = 0.051 moles.

4.Covert 5.50 g of Na2CO3 to number of particles

Now, one mole of sodium carbonate contains Avogadro number of atoms or molecules . Then number of particles in 5.50 g that is 0.051 moles is:

0.051 × 6.022 × 10²³ = 3.072 × 10²² particles.

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