What pairs make a good buffer?

Answer:

MgF2

Explanation:

It just is.

UV radiation This wave, which has a wavelength ranging from 10 nm to 400 nm, is visible in sunshine.

The following transitions are ranked from lowest to highest in terms of energy, wavelength, and frequency 2 to 1\s 6 to 4 8 to 3 An transition is what? An electron in a hydrogen atom can absorb a photon moving from a lower to a higher energy level, according to the Bohr model of the atom. This is what we mean when we talk about the electron in the atom becoming excited. Now that we are aware that electrons can go from one energy level to another and vice versa, we can use this information to describe the spectrum of the hydrogen atom. The energy of each transition depends on the distance between the transitions.

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The atoms are sp² hybridized is when one s orbital and the two p orbitals hybridize to form the three sp² orbitals.

In the sp² hybridization, the one s orbital and the two p orbitals hybridize to form the new three sp² orbitals, each of them consisting of 33% of the s character and 67% of the p character. This type of hybridization is needed when an atom is surrounded by the three groups of electrons.

The number of the hybrid orbitals formed is exactly equal to the number of the atomic orbitals mixing. Hybridization occurs only when the bond formation take place and not in the isolated gaseous atom.

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78

Explanation:

h i hjj h u i j jijjjj h hbhyhujii

The balanced equation for 1 will be [tex]CS_2 + 3Cl_2 ---- > CCl_4 + S_2Cl_2[/tex].

The balanced equation for 2 will be [tex]2AgI + Na_2S -- > Ag_2S + 2NaI[/tex]

A balanced chemical equation is one in which the number of atoms of different elements in the reactions balances the number of atoms of different elements in the products.

In other words, a balanced chemical equation obeys the law of conservation of atoms.

Thus, the balanced equation for each of the equations above would be:

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A reaction that produces an increase in the system's entropy and is exothermic (H negative) will be spontaneous.

A reaction that emits heat and generates a huge negative normal enthalpy change is said to be exothermic.. Exothermic reactions are those in which heat-based energy is released into the surrounding environment.

Endothermic chemical reactions are those in which its reactants take in heat energy from their surroundings to create products. An fast pyrolysis is one in which heat or light are released as forms of energy. Energy from the environment is taken up by the reaction.

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The equation for the molar enthalpy change as a function of temperature is given by:

H = C-p * (T,f - Ti)

Where C-p is the heat capacity of the substance, T,f is the final temperature, and Ti is the initial temperature.

The heat capacity of a substance is a measure of the amount of energy (heat) required to raise the temperature of a given mass of the substance by one degree Celsius. It is often expressed in the unit of J/mol⋅K.

The molar enthalpy change can be used to determine the energy released or absorbed during a chemical reaction. For exothermic reactions, the molar enthalpy change is negative, indicating that energy has been released during the reaction. For endothermic reactions, the molar enthalpy change is positive, indicating that energy has been absorbed during the reaction.

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When exponentiating opposite sides using base 10 to "reverse" the common logarithm, [H+] = 10pH. [H+] = 105.6 0.0000025 = 2.51 106 M is the hydrogen ion level of "Solution A."

The majority of stars and the sun contain hydrogen, and Jupiter is primarily made of this element. Water is the form of hydrogen that is present on Earth in the highest amounts. Only very small amounts of it—less than 1 part a million by volume—are present in the atmosphere as a gas.

Despite not being poisonous, hydrogen can accumulate indoors in places like cell storage rooms and replace oxygen, leading to asphyxiation. By providing hydrogen fuel an artificial scent and notifying consumers in occasion of a leak, odorants can help to some extent mitigate this risk.

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Three oxygen atoms, one nitrogen atom, and one hydrogen atom make up each nitric acid molecule. One of the oxygen atoms in HNO3 molecules is doubly linked to the central nitrogen atom. A second oxygen atom is singly linked to both a hydrogen atom and the central nitrogen atom.

How does nitric acid look on paper?

It has one hydrogen (H) atom, one nitrogen (N) atom, and three oxygen (O) atoms, giving it the chemical formula HNO3. The nitrogen (N) atom is joined to all three oxygen (O) atoms.

HNO3 is a powerful acid, so why?

The claim is that HNO3 is a more potent acid than HNO2. Reason: There are two nitrogen to oxygen linkages in HNO3 compared to just one in HNO2.

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Concentration of NaoH solution following titration should be 0.239 moles/L

Titration refers to the method used for determining the concentration of an unknown solution by gradually adding another solution (the titrant) of known concentration until the end point is reached. End point is seen as a consequence of change in physical properties, such as colour, or by using an indicator.

Balanced equation would be 2 NaOH(aq) + H 2 A(aq) → Na2A(aq) + 2 H2O(l)

Given weight of sample = 0.5010 g

Molar weight of sample = 120 g

Hence, number of moles present of sample = 0.5010/120 = 0.004 moles

1 mole of the acid will produce 2 moles of H+

Hence, 0.004 moles will produce 2 x 0.004 = 0.008 moles of H+

Expecting this to be a solution of 1 molarity, I am assuming the volume of the diprotic acid to be 1000mL

We know, M1V1 = M2V2

Where M = molarity and V = volume

0.008 x 1000 = M2 x 35

M2 = 0.008 x 1000/35 = 228.57 millimoles (millimoles, because we considered volume in mL instead of L)

Hence, M2 = 228.57/1000 = almost 0.239 M

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The carbon atom has 4 chemical bonds and  an oxygen atom has 2. The  bond a carbon monoxide molecule has is a triple bond between the carbon and the oxygen.

In the carbon monoxide, the carbon atom is  directly bonded with oxygen atom. The molecular formula of the carbon monoxide is the CO. In carbon monoxide structure, the carbon atom is bonded to the oxygen atom by the triple bond. In the triple bond, it contains  the one sigma bond  and the two pi bonds.

Thus, The carbon monoxide contains the triple bons and form the covalent bond. The carbon monoxide is a covalent compound.

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The change of one form of energy into another form of energy is called​energy transformation or energy conversion.

Energy conversion, also termed as energy transformation, is the process of changing one form of energy into another. Energy conversion occurs everywhere and every minute of the day.

Energy transformation:

As we know that the total energy in the system remains constant. (Law of conservation of energy which states energy can neither be created nor destroyed.)

But, energy changes from one form to another.

For example, when a body is raised to a certain height, the word done is stored as potential energy. When it is released from that height, this potential energy is converted into kinetic energy.

Another example, when a tube light is turned on, the electrical energy is converted into light energy and heat energy.

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The skydiver is falling at a velocity of 212 kilometres per hour. The speed of the skydiver is 212 miles per hour.

If a skydiver leaps out of a plane and lands at 212 mph, it is necessary to know the skydiver's velocity and speed. Velocity is speed with a direction, whereas speed just exists as a number with a speed unit at the end. While velocity refers to both the speed and direction of an object's motion, speed is the rate at which an object moves along a path over time. The skydiver is falling at a speed of 212 kilometres per hour. 212 kilometres per hour is the speed at which the skydiver is travelling. Speed is the rate at which an object travels along a path over time, as opposed to velocity, which describes the speed and direction of an object's motion. A scalar quantity is speed.

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Here's a step to draw resonance structures in organic chemistry:

There must be genuine Lewis structures in every resonance structure. (Remember that all the guidelines that apply to Lewis structures still hold true here.) The only difference in resonance structures' atom connection and electron configuration. (Electrons move; atoms NEVER do.)

The electron count and net charge are identical for all resonance configurations. (An atom's formal charge may differ, but the net charge, which is the total of all charges, must be the same.)

Only electrons and lone pair electrons (NEVER move bonds!) can be transferred by employing one of the following three transformations to move electrons from a region with a greater electron density to one with a lower electron density:

To depict the motion of the electrons in the "original" resonance structure, use curved arrows. By following the arrows, the "new" resonance structure should be a "product" that is automatically created.

Determine the "new" structure's formal charge and note any non-zero formal charges.

example attached below

Only the electrons can move around in this example because there is only one link and no lone pairs. The low electron density region, or carbocation, is present next to the bond. As a result, it makes sense to transfer the electrons to the position next to the carbocation to create another bond, which results in the "new" structure. Here, the two resonance structures are identical.

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The following statements is accurate: D.)compound made of a metal and  nonmetal is hydrophilic.

Hydrophilic molecule or portion of molecule is one whose interactions with water and other polar substances are more thermodynamically favorable than interactions with oil or other hydrophobic solvents. They are charge-polarized and capable of hydrogen bonding.

Degree or extent to which molecule attracts water is known as the 'hydrophilicity' of that molecule. Some of the common examples of hydrophilic substances are : sugar, salt, starch, and cellulose.

Hydrophilic means that it tends to be attracted to water or that it tends to easily dissolve in, mix with, absorb, or to be saturated by water.

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Answer: S orbitals.

Explanation:

The ideal number of valence electrons and therefore the key for this maze is eight.

This term refers to the electrons found in the outer shell that can bond with other elements, which is the key to creating compounds. Each element has a different number of valence electrons, for example, the elements in the carbon group have 4 valence electrons, while those in the alkali metals group have only 1.

The ideal number is eight, which is the maximum of valence electrons an atom can have.

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The rate of a reaction refers to the speed at which the reaction takes place.

The rate of a reaction depends on many variables such as, temperature, concentration of dissolved reactants, pressure of gaseous reactants, surface area of solid reactants, or the presence of a catalyst.

In order to measure the rate of a reaction, we must measure the change in amount of a reactant as it is consumed over time, or measure the amount of product formed over time.

When you graph the formation of a product, or consumption of a reactant on the y axis, versus the time of reaction on the x-axis, the slope of this function will provide the rate of the reaction.

What is the rate of a reaction?

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Jerell is having a test today that is a neuroimaging technique that uses the magnetic property of certain hydrogen atoms in his brain to create a detailed picture of his brain's structure. The test  he having is MRI.

MRI was developed as a neutral neuroimaging technique that leverages the magnetic propensity of some hydrogen atoms in the brain to produce a precise image of the structure of his brain.

A magnetic field and radio waves produced by a computer are used in the medical imaging procedure known as magnetic resonance imaging (MRI) to provide precise images of your body's organs and tissues.

Utilizing quantitative (computational) tools, neuroimaging studies the structure and function of the central nervous system. It was developed as an unbiased.

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7.9 ml of a 2.0 M solution of boric acid must be added to 600 ml of a solution of 10 mM sodium borate in order for the pH to be 9.45.

To calculate the amount of boric acid solution needed, you need to find out how much hydrogen ions (H+) are present in the initial solution and how much you need to add to the solution to reach a pH of 9.45. The pH of a solution can be calculated using the equation:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter. If the initial pH is 9.45, you can calculate the hydrogen ion concentration in the solution as follows:

[H+] = 10^(-pH) = 10^(-9.45) = 3.16 x 10^(-10) M

To reach a pH of 9.45, you need to add enough boric acid to the solution to bring the hydrogen ion concentration to 3.16 x 10^(-10) M. You can use the following equation to calculate the amount of boric acid needed:

Δn = ΔV * ΔC

where Δn is the change in moles, ΔV is the change in volume, and ΔC is the change in concentration. Since the volume of the initial solution is 600 ml, and the concentration of the boric acid solution is 2.0 M, you can calculate the change in moles of boric acid as follows:

Δn = 600 ml * (3.16 x 10^(-10) M - 10^(-10) M) / 2.0 M = 1.58 x 10^(-7) moles

Finally, you can convert the change in moles to milliliters of boric acid solution using the following equation:

ΔV = Δn / ΔC = 1.58 x 10^(-7) moles / 2.0 M = 7.9 x 10^(-9) liters = 7.9 ml

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The number of molecules 5.87 ×10¹⁹ molecules. 12 mg (i.e 0.012 g) of C₆H₅NO₂ contains 5.87 ×10¹⁹ molecules.

Mass of C₆H₅NO₂ = 12 mg

Number of molecules of C₆H₅NO₂ =?

The next step is to change 12 mg to g.

1 mg = 10¯³ g

Therefore,

12 mg = 12 mg × 10¯³ g / 1 mg

12 mg = 0.012 g

We will then calculate the mass of 1 mole of C₆H₅NO₂.

1 mole of C₆H₅NO₂ = (12×6) + (5×1) + 14 + (16×2)

= 72 + 5 + 14 + 32

= 123 g

We will count the molecules in 12 mg (or 0.012 g) of C₆H₅NO₂.

From Avogadro's hypothesis,

1 mole of C₆H₅NO₂ = 6.02×10²³ molecules

123 g of C₆H₅NO₂ = 6.02×10²³ molecules

Therefore,

0.012 g of C₆H₅NO₂ = 0.012 × 6.02×10²³ / 123

0.012 g of C₆H₅NO₂ = 5.87 ×10¹⁹ molecules.

Thus, 12 mg (i.e 0.012 g) of C₆H₅NO₂ contains 5.87 ×10¹⁹ molecules.

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The electron domain geometry of HBrO2 is pyramidal.

When something is described as "pyramidal," it typically refers to its shape, which is a three-dimensional geometric structure with a polygonal base and triangular sides that converge at a point. The phrase is frequently used to describe a variety of structures, such as the brain's neural network or a mountain's structure.A "pyramidal peak" in geology is a mountain peak that is triangular in shape with steep sides and a flat summit. These peaks can be found in numerous mountain ranges all over the world. They are created by glacial activity and erosion.

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The molecular mass (u) of Phosphoric Acid (H3PO4).[H=1,P=31,O=16]  is 98U.so, option (c) is correct.

What is mass?

The term matter defines mass, and it measures matter. Mass is discovered from the different atoms and particles. Group, in simple terms, determines the weightage of the substance. Mass is expressed in the terms kilograms. Mass of the quantity is a much-needed thing in the laboratory. The quantity of the substance does the majority of the experiment. Gravity also takes place as an independent factor in calculating mass. Mass is the scalar quantity. Gravity and force are playing the independent factor in the mass. For calculating the two planet mass, know the force of the planet.

What is molar mass?

The molar mass is the substance; it helps to determine the mass of the sample substance to the atom of the sample or substance. The molar mass depends on the molecular formula and the isotopes of the atom. Molar mass is used for the inducement of electric charge. Molar mass is the measurement of the volume of the mass. The molar mass is expressed in the unit of dalton.

Molar mass is the sum of the masses of all the individual atoms present in a molecule or compound.

Orthophosphoric acid is the important acid of oxygen and phosphorous.

It is used for making phosphate salts for fertilizers.

Chemical formula of Orthophosphoric acid is H3PO4.

Atomic mass of Oxygen O is 16 u.

Atomic mass of hydrogen H is 1 u.

Atomic mass of Phosphorous P is 31 u.

Molecular mass of Orthophosphoric acid H3PO4 = (Atomic mass of Hydrogen) x 3 + (Atomic mass of Phosphorous) x 1 + (Atomic mass of Oxygen) x 4

= ( 1 x 3 ) + ( 31 x 1 ) + ( 16 x 4 )

= 3 + 31 + 64

= 98 u.

Molecular mass of Orthophosphoric acid H3PO4 is 98

Therefore,  molecular mass (u) of Phosphoric Acid (H3PO4).[H=1,P=31,O=16]  is 98U.(c).

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The organic compounds that contains the double or the triple bond such organic compounds are called as the saturated hydrocarbon and called as alkenes and alkynes.

The organic compound containing double or the triple bonds called as unsaturated hydrocarbons. The hydrocarbon which contains the the double bond called as the alkene. The general formula for the alkenes are CnH2n. The example of the alkene is the Ethene ( C₂H₄ )

The organic compounds which contain the triple bond are called as alkynes . The general formula for the alkynes are CnH2n-2. The examples of the alkynes is the Ethyne ( C₂H₂)

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All flasks have 0.039 moles of gas. Therefore, option D is correct.

Given:

All 3 flasks have

Volume (V) = 1.00L

Pressure (P)  = 750Torr

Temperature (T) = 25°C

= 298K

As all three parameters P, V and T are identical according to Avogadro's law, all three flasks should have same number of moles irrespective of the gas.

So, all have the same number of moles.

Now, if the moles = 0.039

Using the ideal gas equation

PV = nRT

n = PV/RT

= (725/760) atm x 1.00L / 0.0821L.atm/K.mol x 298

=0.03899 mol

=0.039 mol

Thus, all flaks have 0.039 moles of gas.

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If the rate law for the chemical reaction is: rate = k [x]² , the units of the rate constant k is M⁻¹ s⁻¹.

The rate law = rate = k [x]²

The rate of the reaction is of second order. The R in the second order id the unit of the Molarity / second. The concentration x is in the molarity , M.

R in M /s = k [x in M]

By solving the equation , we get:

M / s = k M²

k = M / s. M²

k = 1 / Ms

k = M⁻¹ s⁻¹

Thus, the unit of the rate constant k is M⁻¹ s⁻¹.

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The concentration of the mixture would be 0.16 or 16%.

To calculate the concentration of the new mixture, you can find the total mass of sugar in each solution, then find the total mass of sugar in the mixture, and divide that by the total mass of the mixture to find the concentration.

In the 10% sugar solution, there's 200 g * 0.1 = 20 g of sugar.

In the 20% sugar solution, there's 300 g * 0.2 = 60 g of sugar.

So, in the mixture there's a total of 20 g + 60 g = 80 g of sugar.

And the total mass of the mixture is 200 g + 300 g = 500 g.

Therefore, the concentration of the mixture would be 80 g / 500 g = 0.16, or 16%.

A solution is a mixture of two or more substances in which one substance, called the solute, is dissolved in another substance, called the solvent. The solute and solvent are thoroughly combined and create a homogeneous mixture, where the solute is evenly distributed throughout the solvent. Solutions can be either liquid, gas or solid. The properties of a solution depend on the nature of the solute and solvent, as well as the concentration of the solute in the solvent. Solutions can be made by dissolving the solute in the solvent, or by mixing two or more solutions together. The solute is said to be "dissolved" in the solvent if it forms a stable mixture that does not separate over time. Solutions are important in many areas of science and technology, including chemistry, medicine, food and beverage production, and more.

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Enthalpy of vaporisation for Freon 113, also known as C2Cl3F3, is 27.0 kJ/mol, and its usual boiling point is 48.0 °C. Therefore, Freon-113 has a vapour pressure of 0.77 atm.

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 H vap and also referred to as the (latent) heat of vaporisation or heat of evaporation.The substance's enthalpy of vaporisation is H=27.0 kJ/mol=27.0 103 J/mol.

P1=1atM is the pressure at the typical boiling point.

The chemical C2Cl3F3 has an initial temperature of T1=48.0C=48.0+273.15

The material C2Cl3F3 has an initial temperature of T2=40.3C=40.3+273.15K.

R=8.314J/Kmol is the gas constant's value.

The formula for vapour pressure is given as ln(P2P1)=HR(1T21T1)

all the plugs Vapor pressure is expressed as ln(P2P1)=HR(1T21T1)

The following results from simplifying the previous formula for the necessary vapour pressure and plugging in all the values:

(atm)=3247.53 K(321.15K113.15 K313.15K(321.15K)) where ln(P21atm)=27.0103J/mol 8.314J/Kmol (140.3+273.15K148.0+273.15K)

P21atm = ln(3247.53 K) (8100568.1225K)

ln(P21atm)=−0.25833

If we multiply each side of the equation by the exponent of base e, we get: Eln (P21atm) = e 0.25833P2 1 atm = e 0.25833 P2 = e 0.258331 atm

P2=0.77atm

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