Mass spectrometry, IR spectroscopy, and NMR spectroscopy are all techniques used to determine structures of organic molecules. Although each technique gives different information, all of them rely on the interaction of a(n) _____ source with a molecule to produce a change from which molecular information can be inferred.

To calculate the Ka for the monoprotic weak acid, we can use the given information about the concentration and pH of the solution.
1. We have a 0.0200 M solution of the weak acid.
2. The pH of the solution is 2.62.
First, we need to find the hydrogen ion concentration [H+] using the pH formula:
pH = -log10[H+]
2.62 = -log10[H+]
[H+] = 10^(-2.62)

Now, let's set up an equilibrium expression for the weak acid dissociation. If HA represents the weak acid, then the dissociation reaction is:
HA ⇌ H+ + A-
Since the initial concentration of the acid is 0.0200 M and we know the [H+] from the pH, we can set up the following table for concentrations:
 HA     ⇌    H+    +   A-
Initial: 0.0200 M          0 M        0 M
Change:    -x             +x        +x
Equilibrium: 0.0200-x M    x M      x M
Where x represents the change in concentration.

We know that [H+] = x = 10^(-2.62). Therefore, the equilibrium concentrations are:
HA: 0.0200 - 10^(-2.62) M
H+: 10^(-2.62) M
A-: 10^(-2.62) M
Now, we can calculate the Ka using the equilibrium concentrations:
Ka = [H+][A-] / [HA]
Ka = (10^(-2.62) * 10^(-2.62)) / (0.0200 - 10^(-2.62))
Calculate the value of Ka using the given information. This will provide the Ka for the monoprotic weak acid.

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Due to the rules for electrolyte solutions, when sodium leaves a cell it enters the extracellular fluid and creates a concentration gradient that drives the movement of other ions, such as potassium, into the cell to maintain the balance of electrolytes.

The process that occurs when sodium leaves a cell in an electrolyte solution. When sodium (Na+) leaves a cell in an electrolyte solution, potassium (K+) ions enter the cell. This process is known as the sodium-potassium pump, which is an essential mechanism for maintaining cell membrane potential and proper electrolyte balance. The sodium-potassium pump works by actively transporting 3 sodium ions out of the cell while bringing 2 potassium ions into the cell, ensuring a proper balance of ions inside and outside the cell. This movement of ions is crucial for proper cellular function and is regulated by specialized channels and transporters within the cell membrane.

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complete question:

Due to the rules for electrolyte solutions, when sodium leaves a cell this enters. what will happen?

To mix acid and water, always add acid to water, never the other way around, always add acid to water. Option B is the correct answer.

Mixing acid and water is a common laboratory procedure, but it must be done carefully to avoid dangerous reactions.

It is important to add acid to water, not the other way around, to prevent a potentially explosive reaction that can cause the solution to boil and splatter.

This is because adding water to acid can cause the solution to rapidly release heat and gas, creating a dangerous situation. By adding acid to water, the acid can be gradually diluted and any heat released can be dissipated more safely.

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0.0034 moles of HA have been added at the equivalence point.

At the equivalence point of a titration, the moles of acid added will equal the moles of base initially present in the solution.

First, we need to calculate the initial moles of base present in the solution:

moles of base = volume of solution (L) x concentration of base (mol/L)
moles of base = 0.034 L x 0.10 mol/L
moles of base = 0.0034 mol

At the equivalence point, all of the base has reacted with the acid, and the solution will be neutral (pH 7). Therefore, the moles of acid added at the equivalence point will be equal to the initial moles of base:

moles of HA added = moles of base
moles of HA added = 0.0034 mol

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At the equivalence point, all of the weak base B has reacted with the strong acid HA, resulting in the formation of an equal amount of the conjugate acid BH+ and water.

The balanced chemical equation for the reaction is:

HA + B → BH+ + A-

Since the Stichometry reaction is 1:1, the number of moles of HA added at the equivalence point is equal to the number of moles of the weak base B originally present in the solution.

To determine the number of moles of B, we can use the formula:
moles of solute = concentration x volume (in liters)

We are given that the initial volume of the weak base B solution is 34.0 mL, which is equivalent to 0.0340 L. The initial concentration of the solution is 0.10 M, which means that there are:
moles of B = 0.10 M x 0.0340 L = 0.0034 moles of B

Therefore, the number of moles of HA added at the equivalence point is also 0.0034 moles.

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Concerning the rate law, Rate = k[A][B][C],  the appropriate units for the rate constant "K" are s⁻¹, M⁻¹s⁻¹ , M⁻²s⁻¹, Ms⁻¹. option (a), (b), (c), (d) are correct.

The rate law for a chemical reaction describes a relationship between the rate of the reaction and the concentrations of all the participating reactants.

The order of a reaction describes the change in  reaction rate that can be observed by increasing the concentration of  reactants. For example: If the reaction is a zero-order, then on doubling the reactant concentration there will be no effect on the reaction rate. If the reaction is first order, then on doubling the reactant concentration, reaction rate will be doubled. If reaction is second-order , doubling the concentration of the reactants will quadruple the reaction rate. In third-order reactions, the overall rate increases eight times on doubling the reactant concentration.

The units of rate constant for zero, first, second and third order reaction respectively are  Ms⁻¹,  s⁻¹, M⁻¹s⁻¹ , M⁻²s⁻¹.

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There  are approximately 1.47 x 10^24 copper atoms in 2.45 mol of copper.

To calculate the number of copper atoms in 2.45 mol of copper, we can use Avogadro's number, which is defined as the number of atoms in one mole of an element. Avogadro's number is approximately 6.022 x 10^23 atoms per mole.

To calculate the number of atoms in 2.45 mol of copper, we can use the following steps:

1. Multiply the number of moles by Avogadro's number:
  2.45 mol * 6.022 x 10^23 atoms/mol = 1.47 x 10^24 atoms

Therefore, there are approximately 1.47 x 10^24 copper atoms in 2.45 mol of copper.

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The table organizes the elements by atomic number, which corresponds to the number of protons in each atom. However, the table's creator, a 19th-century Russian chemistry professor named Dmitri Mendeleev, was not aware of protons or atomic numbers at the time of his creation.

The organization of elements in the periodic table by atomic number is based on the number of protons in each atom. However, it is interesting to note that the table's creator, Dmitri Mendeleev, was unaware of the concept of protons or atomic numbers during the development of the table in the 19th century. Mendeleev instead organized the elements by their chemical and physical properties, and it was later discovered that this arrangement correlated with the elements' atomic structure. Despite his lack of knowledge of protons and atomic numbers, Mendeleev's organization of the periodic table remains a foundational tool in chemistry today.

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The moles of gas do that he has is 0.024 moles.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g

Given,

Pressure = 2.2 atm

Volume = 31 L

Temperature = 67C

PV = nRT

2.2 × 31 = n × 8.314 × 341

n = 0.024 moles

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O2 is the limiting reagent, and NH3 is in excess.

To determine the limiting reagent, we need to calculate the amount of product that can be formed from each reactant and compare them.
First, we need to convert the given masses of NH3 and O2 to moles using their respective molar masses:
20.0 g NH3 ÷ 17.03 g/mol NH3 = 1.17 mol NH3
50.0 g O2 ÷ 32.00 g/mol O2 = 1.56 mol O2
Next, we use the balanced chemical equation to determine the amount of product that can be formed from each reactant. We will use NH3 as an example:
1.17 mol NH3 × (4 mol NO ÷ 4 mol NH3) = 1.17 mol NO
1.17 mol NH3 × (6 mol H2O ÷ 4 mol NH3) = 1.75 mol H2O
Now we do the same calculation for O2:
1.56 mol O2 × (4 mol NO ÷ 5 mol O2) = 1.25 mol NO
1.56 mol O2 × (6 mol H2O ÷ 5 mol O2) = 1.87 mol H2O
From the calculations, we can see that NH3 can produce 1.17 mol NO and 1.75 mol H2O, while O2 can produce only 1.25 mol NO and 1.87 mol H2O.
The correct answer is B) O2.

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Chemicals play a crucial role in maintaining the cleanliness and safety of swimming pools. Among the most commonly used chemicals are chlorine, chlorinated cyanurates, and bromine. Chlorine, for instance, is widely used due to its ability to effectively kill bacteria, viruses, and algae.

It works by releasing hypochlorous acid, which attacks the cell walls of microorganisms and destroys them. Chlorinated cyanurates, on the other hand, are derivatives of chlorine and provide a longer-lasting disinfectant effect. They are particularly useful in outdoor pools where chlorine can be easily dissipated by the sun's UV rays.

Bromine, another popular pool disinfectant, works similarly to chlorine but is less volatile and less likely to cause skin and eye irritation. Unlike chlorine, bromine does not have a strong odor and does not produce as many harmful byproducts.

Ammonia, soda ash, and sodium thiosulfate are not commonly used for pool disinfection but may be used to adjust the pH levels and alkalinity of pool water. Iodine, on the other hand, is not recommended for pool disinfection due to its high cost and tendency to stain surfaces.

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In the synthesis of benzilic acid from benzil and potassium hydroxide, a benzilic acid rearrangement occurs. This is a nucleophilic acyl substitution reaction.

Involving the following steps:
1. The potassium hydroxide (KOH) acts as a base and deprotonates the benzil, forming a potassium benzilate ion.
2. The negatively charged oxygen in the potassium benzilate ion attacks the carbonyl carbon of the adjacent carbonyl group.
3. This results in the formation of a cyclic intermediate, which undergoes a rearrangement.
4. Protonation of the rearranged intermediate by water leads to the formation of benzilic acid.
The benzilic acid rearrangement is a key step in the synthesis process, and it involves the migration of a phenyl group to the alpha-carbon of the carbonyl group.

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Answer:

gain

Explanation:

To allow for shrinkage that occurs during solidification, the mold cavity must be oversized. This is because as the molten material cools and solidifies, it naturally shrinks in size.

If the mold cavity is undersized, the solidified material may not fit properly or may crack due to the lack of space for shrinkage. Therefore, an oversized mold cavity is necessary to ensure that the final product is the correct size and shape after solidification.

Shrinkage occurs when a material, such as metal or plastic, cools and solidifies in a mold. As the material cools, it contracts, causing it to occupy less space. To compensate for this shrinkage during the solidification process, the mold cavity is designed to be oversized. This ensures that the final product has the desired dimensions after the material has fully solidified and contracted.

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The correct answer is c. Methyl bromide is primarily used as a pesticide.

Methyl bromide is primarily used as a pesticide and fungicide. It works by releasing a gas that kills insects, weeds, and fungi. It is used in a variety of agricultural, commercial, and residential settings. In some cases, it is used to fumigate stored grains, ship hulls, soil, and other areas where pests and fungi may be present. It is also used to treat seed beds to kill weeds and fungi before planting. Methyl bromide can also be used in greenhouses to prevent the spread of pests and diseases.

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There are several chemicals that have highly irritating vapors, but here are three examples:

Ammonia: This is a colorless gas with a pungent, suffocating odor that can cause severe irritation to the eyes, nose, throat, and respiratory system. Ammonia vapors can cause coughing, chest tightness, and difficulty breathing.

Chlorine: Chlorine is a greenish-yellow gas with a strong, pungent odor. It is a powerful irritant that can cause severe respiratory and eye irritation, coughing, and chest pain. Chlorine gas can also be fatal at high concentrations.

Formaldehyde: This is a colorless gas with a pungent, irritating odor that can cause eye, nose, and throat irritation, coughing, and difficulty breathing. Formaldehyde is commonly used as a preservative and in the manufacture of various products, including building materials, furniture, and textiles. Chronic exposure to formaldehyde has also been linked to cancer.

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Three common naturally radioactive elements are uranium, thorium, and radium.

These elements undergo radioactive decay, emitting radiation in the form of alpha, beta, or gamma particles. Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles.

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Three common naturally radioactive elements are uranium, potassium, and carbon-14.

Radioactivity is a phenomenon in which certain unstable atoms undergo spontaneous nuclear decay and emit radiation in the form of particles or waves. Many elements found in nature are naturally radioactive, meaning they contain unstable isotopes that undergo radioactive decay.

Three common naturally occurring radioactive elements are:

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Full Question: "Some elements are naturally radioactive. Can you list 3 common ones?"

The temperature T2 is 343.91 K. We would need additional information about the pressures at the initial and final states of the gas to calculate the final temperature.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance, such as a gas, liquid, or solid. It is commonly associated with the sensation of hotness or coldness, and is typically measured in units such as Celsius (°C), Fahrenheit (°F), or Kelvin (K).

To find the new temperature of the gas after compression, we can use the combined gas law, which relates the initial and final states of a gas undergoing changes in pressure, volume, and temperature.

The combined gas law formula is given as:

(P1 * V1) / T1 = (P2 * V2) / T2

P1 = pressure of the gas at the initial state (unknown)

V1 = initial volume of the gas = 831.8 mL

T1 = initial temperature of the gas = 49.2 + 273.15 K (converting Celsius to Kelvin)

P2 = pressure of the gas at the final state (unknown)

V2 = final volume of the gas = 79 mL

T2 = final temperature of the gas (unknown)

We need to solve for T2, the final temperature of the gas.

Rearranging the formula to solve for T2, we get:

T2 = (P2 * V2 * T1) / (P1 * V1)

Now we can plug in the given values and solve for T2:

T2 = (P2 * 79 * (49.2 + 273.15)) / (P1 * 831.8)

T2 = (P2 * 79 * (49.2 + 273.15)) / (P1 * 831.8)

T2 = (2.0 atm * 79 * (49.2 + 273.15 K)) / (1.5 atm * 831.8)

T2 = 343.91 K

Therefore, the temperature T2 is 343.91 K.

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277K is the new temperature if 831.8 mL of gas is at 49.2 C and is compressed to a volume of 79 mL.

What is the definition of the ideal gas law?

The rule that states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gram of an ideal gas.

The phrase "ideal gas" describes a fictitious gas made up of molecules that adhere to the following principles: No attraction or repellence exists between the molecules of ideal gases. The sole interaction between molecules of an ideal gas would be an elastic collision when they collided or an elastic collision with the container walls.

(P1 * V1) / T1 = (P2 * V2) / T2

V1 = 831.8 mL

T1 = 49.2 + 273.15 K

V2 =  79 mL

T2 = final temperature of the gas

To solve for T2, the final temperature of the gas.

T2 = ( V2 * T1) / ( V1)

T2 = 79*322.35/831.8

T2 = 277K

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An aluminum ion, Al3+, has Option D) 13 protons and 10 electrons.

An aluminum ion, Al3+, has 13 protons and 10 electrons. This is because Al has 13 protons and 13 electrons in its neutral state. However, when it loses 3 electrons to form the Al3+ ion, it now has 13 protons (+13 charge) and only 10 electrons (-10 charge), giving it an overall charge of +3.

Al3+, an ion of aluminium, with 13 protons and 10 electrons. This is due to Al's neutral state's 13 protons and 13 electrons. The Al3+ ion is created when it loses 3 electrons, leaving it with 13 protons (+13 charge), 10 electrons (-10 charge), and an overall charge of +3.

Aluminium has a 13th atomic number. This shows that there are (13-3 = 10) electrons, or the number of electrons, present in the Al3+ ion. However, there will always be the same number of protons.

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The correct answer is b. In a first-order reaction, the rate constant of a reaction is equal to the velocity of the reaction divided by the concentration of substrate.

The velocity of a reaction is directly proportional to the rate constant of the reaction, which means that as the rate constant increases, the velocity of the reaction also increases. However, this relationship only holds true for first-order reactions, and not for second-order reactions. A special characteristic was introduced to compare the velocities of reactions quantitatively. It's called the rate (or velocity) of the reaction and is defined as the change of some parameter in a given time.

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If H₂SO₄ had been used in the esterification reaction as the acid catalyst instead of the solid resin, we have to wash the ether layer containing the product with sodium chloride because in order to transfer any trace of water from either layer to aqueous layer OR to force organic solute from aqueous layer to organic layer.

Generally esterification is defined as the process of combining an organic acid (R-COOH) along with an alcohol (R-OH) to give rise an ester (RCOOR) and water as by product; or also it is known as a chemical reaction resulting in the formation of at least one ester product. Basically ester is obtained by an esterification reaction of an alcohol and a carboxylic acid.

When H₂SO₄ is used as the catalyst in the esterification reaction the ether layers in the product should be washed properly because even a small amount water should be removed from all the layers.

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The purpose of adding CaCl2 pellets to your product after the azeotropic distillation is to remove any remaining traces of water and ensure the complete drying of the product.

Azeotropic distillation is a technique used to separate liquid mixtures, often containing water, by taking advantage of the difference in boiling points of the components. However, it might not completely remove all water present in the mixture.

Calcium chloride (CaCl2) is a highly effective desiccant, which means it has a strong affinity for water and can absorb it from the surrounding environment. When CaCl2 pellets are added to the product after azeotropic distillation, they absorb any residual water, leading to a thoroughly dried product.

This is essential in chemical reactions where the presence of water can negatively impact the desired outcome, such as interfering with reaction rates, causing side reactions, or reducing product purity.

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Substances that behave in this way are said to be thixotropic. Thixotropic materials form suspensions that separate into solid like mixtures and water, but the solid like mixture can flow like a liquid when stirring or agitation.

Conjugation is the process of exchanging genetic material by creating a bridge, according to one definition. This is a specific form of horizontal gene transfer method.

The process of conjugation depends on cell-to-cell interaction. Since stirring or agitation makes it easier for cells to come into contact with one another, the conjugation process is more effective in liquid media. Less possibility of conjugation occurs when cells are cultured on agar plates.

When a substance is being dissolved in a solvent, stirring the solution will speed up the process. This is due to the fact that stirring a solution exposes more of the solute's surface area to the solvent, increasing the solute and solvent interaction. The rate at which the solute dissolves increases with the amount of solute exposed to the solvent.

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Answer: Hi!

Your answer is D!

Explanation:

SCADA is the acronym for Supervisory Control and Data Acquisition.

Answer: Your answer would be heat of combustion.

Explanation: When oxygen combines with another substance and gives off light and heat, this is called combustion.

Answer:

Let the amount of C₂F4 and HCl produced at equilibrium be x mol.

Using the stoichiometry of the balanced chemical equation, we can write the equilibrium expression for the reaction as follows:

Kc = ([C₂F4][HCl]²) / [CHCIF₂]²

where Kc is the equilibrium constant, [C₂F4], [HCl], and [CHCIF₂] are the equilibrium concentrations of each species in mol dm⁻³.

At equilibrium, the concentration of CHCIF₂ is 0.270 mol / 23.2 dm³ = 0.0116 mol dm⁻³.

We can use the equilibrium expression and the given equilibrium constant to solve for the concentrations of C₂F4 and HCl at equilibrium:

Kc = ([C₂F4][HCl]²) / [CHCIF₂]²

128 × 10³ = (x)(2x²) / (0.0116)²

Solving for x, we get:

x = 0.153 mol

Therefore, at equilibrium, the amount of C₂F4 produced is 0.153 mol and the amount of HCl produced is 0.306 mol (twice the amount of C₂F4, according to the stoichiometry of the balanced chemical equation).

A high-quality muffin is typically tender, moist, and flavorful. The ideal muffin should have a slightly crisp crust with a soft and fluffy crumb on the inside. It should be well-risen, with a good balance of sweetness and flavor.

The amount of mixing can significantly influence the quality of the muffin. Over-mixing can lead to the formation of too much gluten, which can result in a dense and tough texture. Gluten is formed when the flour in the batter comes into contact with liquid and is agitated. Therefore, when mixing the batter for muffins, it is essential to mix it just enough to combine the ingredients and form a cohesive batter.

On the other hand, under-mixing can result in a muffin that is too crumbly and falls apart easily. Therefore, the mixing of muffin batter should be done just until the ingredients are evenly combined, and there are no large lumps of flour in the batter. It is okay if the batter is slightly lumpy, and it is better to err on the side of under-mixing than over-mixing.

In summary, the key to achieving a high-quality muffin is to mix the batter gently and just enough to combine the ingredients. This will result in a tender and moist muffin with a light and fluffy texture.

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The pH of the solution after 20.0 ml of 0.200 M NaOH is added to a 50.0 ml sample of 0.150 M HCl is 13.03.

To calculate the pH after 20.0 ml of 0.200 M NaOH is added to a 50.0 ml sample of 0.150 M HCl, we need to use the equation for the reaction between the acid and base:

HCl + NaOH → NaCl + H2O

We can start by calculating the amount of moles of HCl in the initial solution:

n(HCl) = M(HCl) x V(HCl)
n(HCl) = 0.150 mol/L x 0.050 L
n(HCl) = 0.0075 mol

Since the reaction is a 1:1 stoichiometry, the amount of moles of NaOH added to the solution will be equal to the amount of moles of HCl originally present:

n(NaOH) = n(HCl)
n(NaOH) = 0.0075 mol

We can use the amount of moles of NaOH and the volume of NaOH added (20.0 ml) to calculate the new concentration of NaOH:

M(NaOH) = n(NaOH) / V(NaOH)
M(NaOH) = 0.0075 mol / 0.020 L
M(NaOH) = 0.375 M

Now, we can calculate the amount of moles of HCl remaining in the solution after the addition of NaOH:

n(HCl) = n(HCl)initial - n(NaOH)
n(HCl) = 0.0075 mol - 0.0075 mol
n(HCl) = 0.000 mol

This means that all the HCl has reacted with the NaOH, and we are left with only NaCl and water in the solution. To calculate the pH, we need to calculate the concentration of NaCl:

n(NaCl) = n(NaOH)
n(NaCl) = 0.0075 mol

M(NaCl) = n(NaCl) / V(solution)
M(NaCl) = 0.0075 mol / 0.070 L
M(NaCl) = 0.107 M

We can use the concentration of NaCl to calculate the concentration of H+ ions (which is the same as the concentration of OH- ions since the solution is neutral):

[H+] = [OH-] = Kw / [NaCl]
[H+] = [OH-] = 1.0 x 10^-14 / 0.107 M
[H+] = [OH-] = 9.35 x 10^-14 M

Finally, we can use the pH equation to calculate the pH:

pH = -log[H+]
pH = -log(9.35 x 10^-14)
pH = 13.03

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To calculate the pH after 20.0 mL of 0.200 M NaOH have been added to a 50.0 mL sample of 0.150 M HCl, follow these steps:

1. Determine the moles of HCl and NaOH:
moles of HCl = (volume of HCl) x (concentration of HCl) = (50.0 mL) x (0.150 M) = 7.5 mmol
moles of NaOH = (volume of NaOH) x (concentration of NaOH) = (20.0 mL) x (0.200 M) = 4.0 mmol

2. Calculate the moles of remaining HCl after the reaction:
Since HCl and NaOH react in a 1:1 ratio, subtract the moles of NaOH from the moles of HCl: 7.5 mmol - 4.0 mmol = 3.5 mmol of HCl remaining.

3. Calculate the concentration of remaining HCl:
Since the total volume of the solution has increased, new concentration = (moles of HCl) / (total volume in L) = (3.5 mmol) / (50.0 mL + 20.0 mL) x (1 L/1000 mL) = 0.050 M

4. Calculate the pH of the solution:
Since the remaining solution contains only HCl, the pH is determined by the concentration of H+ ions. For HCl, [H+] = [HCl], so pH = -log[H+] = -log(0.050) ≈ 1.30

In conclusion, after 20.0 mL of 0.200 M NaOH have been added to a 50.0 mL sample of 0.150 M HCl, the pH of the solution is approximately 1.30.

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In the given options, oxidation occurs in option D: NO2- → NO3-. In this change, the nitrogen atom increases its oxidation state from +3 in NO2- to +5 in NO3-, which indicates an oxidation process.

The chemical processes in which electrons are transferred from one chemical to another. Redox reactions, also known as oxidation-reduction reactions, are the name given to these electron-transfer processes. Energy changes in the form of heat, light, electricity, etc. accompany these reactions. The addition of oxygen or hydrogen to various substances is another step in the oxidation and reduction reactions.

In the given options, oxidation occurs in option D: NO2- → NO3-. In this change, the nitrogen atom increases its oxidation state from +3 in NO2- to +5 in NO3-, which indicates an oxidation process.

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"In which change does oxidation occur?"

The correct answer is option D: NO2- → NO3-.

In this change, the nitrogen atom in the nitrite ion (NO2-) is oxidized to form the nitrate ion (NO3-). Here's a step-by-step explanation:

1. Identify the oxidation states of nitrogen in both ions.
  In NO2-, the nitrogen atom has an oxidation state of +3.
  In NO3-, the nitrogen atom has an oxidation state of +5.

2. Compare the oxidation states.
  The oxidation state of nitrogen increases from +3 in NO2- to +5 in NO3-.

3. Determine if oxidation occurred.
  Since the oxidation state increased, oxidation occurred in this change.

So, the change in which oxidation occurs is NO2- → NO3-.

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