Atoms in a gem that aren't part of its essential chemical composition are called

Here's a classification of the given processes into exothermic and endothermic categories:

(a) Combustion: Exothermic. Combustion releases heat as chemical bonds are broken and new ones are formed, usually accompanied by the release of energy.

(b) Freezing water: Exothermic. During freezing, water molecules lose energy and form a solid structure, releasing heat in the process.

(c) Melting ice: Endothermic. Melting ice requires the absorption of heat to break the bonds between water molecules in the solid state and convert them into a liquid state.

(d) Boiling water: Endothermic. Boiling water involves the absorption of heat to convert liquid water into water vapor.

(e) Condensing steam: Exothermic. During condensation, water vapor molecules release heat as they transition from the gaseous state to the liquid state.

(f) Burning paper: Exothermic. Burning paper is a form of combustion, where chemical reactions release heat as the paper is broken down.

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The number of grams of excess reactant is 1.16 grams of NH₃.

To calculate the number of grams of excess reactant, we first need to determine the limiting reactant, which is the reactant that is completely consumed and determines the amount of product formed. The other reactant is considered the excess reactant.

Given;

Mass of NH₃ = 3.46 g

Mass of HCl = 4.91 g

To determine the limiting reactant, we can compare the moles of each reactant using their respective molar masses.

Molar mass of NH₃ (ammonia) = 17.03 g/mol

Molar mass of HCl (hydrogen chloride) = 36.46 g/mol

Moles of NH₃ = mass of NH₃ / molar mass of NH₃

Moles of HCl = mass of HCl / molar mass of HCl

Plugging in the given values;

Moles of NH₃ = 3.46 g / 17.03 g/mol

= 0.2031 mol

Moles of HCl = 4.91 g / 36.46 g/mol

= 0.1347 mol

To calculate the amount of excess reactant, we subtract the moles of the limiting reactant from the moles of the excess reactant;

Excess moles of NH₃ = Moles of NH₃ - Moles of HCl

Excess moles of NH₃ = 0.2031 mol - 0.1347 mol

= 0.0684 mol

Now, we can calculate the mass of the excess reactant using its molar mass;

Mass of excess NH₃ = Excess moles of NH₃ × molar mass of NH₃

Mass of excess NH₃ = 0.0684 mol × 17.03 g/mol

= 1.16 g

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Approximately 30.9 moles of KClO3 are needed to produce 1039 L of O2 according to the given equation. To determine how many moles of KClO3 are needed to produce 1039 L of O2 according to the equation 2KClO3 → 2KCl(s) + 3O2(g), follow these steps:

Step:1. Determine the stoichiometric ratio between KClO3 and O2 from the balanced equation. In this case, it is 2 moles of KClO3 producing 3 moles of O2.
Step:2. Convert the given volume of O2 (1039 L) to moles using the ideal gas law. Assume standard temperature and pressure (STP) conditions, where 1 mole of any gas occupies 22.4 L.
Moles of O2 = 1039 L / 22.4 L/mol = 46.4 moles (approximately)
Step:3. Using the stoichiometric ratio, calculate the moles of KClO3 needed to produce 46.4 moles of O2.
(2 moles KClO3 / 3 moles O2) x 46.4 moles O2 = 30.9 moles of KClO3 (approximately)

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Overall, this reaction is important in environmental chemistry as it can be used to remove sulphites from water and other solutions.

The half reaction for the conversion of sulphite to sulfate involves the transfer of two electrons and two hydrogen ions. The half reaction can be represented as follows:
[tex]SO_3^{2-} + 2H^+ + 2e^- -- > SO_4^{2-}[/tex]
This half reaction shows that sulphite ([tex]SO_3^{2-}[/tex]) is oxidized to sulfate ([tex]SO_4^{2-}[/tex]) by losing two electrons and two hydrogen ions. This process can occur in the presence of an oxidizing agent, such as hydrogen peroxide or chlorine. The sulfate ion is the final product of the reaction and the sulfur dioxide molecule is released as a gas into the atmosphere.

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The best method to determine the hydroxide ion concentration of an aqueous solution with legal ramifications would be to use titration with a standardised acid solution.

Titration with a strong acid and a reliable indicator, followed by careful calculations, is the best method to determine hydroxide ion concentration. This method provides high accuracy and precision, allowing you to confidently determine the hydroxide ion concentration in the aqueous solution.This method is highly accurate and provides precise results. It involves adding the acid solution to the solution of unknown hydroxide ion concentration until the equivalence point is reached, which is indicated by a color change in the solution. The amount of acid solution used can then be used to calculate the hydroxide ion concentration of the original solution with high accuracy and without reasonable doubt.

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The molarity of the solution that contains 32.00 g of sodium chloride and 275 g of water is 1.994 M.

To calculate the molarity of a solution, we first need to determine the number of moles of the solute (sodium chloride, NaCl) and the volume of the solution (in liters).

Given; Mass of NaCl = 32.00 g

Mass of water = 275 g

Calculate the number of moles of NaCl.

To find the number of moles of NaCl, we can use its molar mass, which is the sum of the atomic masses of sodium (Na) and chlorine (Cl).

Molar mass of NaCl=Atomic mass of Na + Atomic mass of Cl

= 22.99 g/mol (for Na) + 35.45 g/mol (for Cl)

= 58.44 g/mol

Number of moles of NaCl = Mass of NaCl/Molar mass of NaCl

= 32.00 g / 58.44 g/mol

= 0.5477 mol

Now, we can convert the mass of water to volume in liters.

The mass of water needs to be converted to volume in liters in order to calculate the molarity of the solution. This can be done using the density of water, which is approximately 1 g/mL or 1 g/cm³.

Density of water= 1 g/mL or 1 g/cm³

Mass of water = 275 g

Volume of water = Mass of water/Density of water

= 275 g / 1 g/mL

= 275 mL (since 1 mL = 1 cm³)

Converting mL to L;

Volume of water = 275 mL / 1000 mL/L

= 0.275 L

Now, we can Calculate the molarity of the solution.

Molarity (M) is termed as the number of moles of solute per liter of solution.

Molarity (M) = Number of moles of solute/Volume of solution (in liters)

Plugging in the values;

Molarity (M) = 0.5477 mol / 0.275 L

= 1.994 M

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We need 0.125 moles of LiCl to make a 0.50 M solution in 0.250 L of solution.

The volume of solution = 0. 250 L

Molarity of solution = 0. 50 M

A mole is described as the quantity of a substance that includes as many particles that are bonded together in a compound as there are atoms in exactly 12 g of carbon 12 isotope.

To find the number of moles of LiCl, we can use the formula:

moles of solute = concentration of solute * volume of solution

moles of LiCl = 0.50 mol/L x 0.250 L

moles of LiCl = 0.125 mol

Therefore, we can conclude that we need 0.125 moles of LiCl to make a 0.50 M solution in 0.250 L of solution.

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Anion exchange chromatography is a technique commonly used in protein purification. The retention of an amino acid on an anion exchange column depends on the interaction between the positively charged amino acid molecule and the negatively charged resin of the column.

For amino acids that are positively charged at neutral pH, such as lysine, arginine, and histidine, they will interact strongly with the negatively charged resin of the anion exchange column. This will result in increased retention time for these amino acids on the column. As the concentration of salt in the mobile phase is increased, these positively charged amino acids will be displaced from the column.

On the other hand, amino acids that are negatively charged at neutral pH, such as aspartic acid and glutamic acid, will not interact with the negatively charged resin of the anion exchange column. This results in minimal retention time on the column. As the concentration of salt in the mobile phase is decreased, these negatively charged amino acids will interact more strongly with the column, increasing retention time.

Amino acids that are neutral at neutral pH, such as glycine, alanine, and valine, will not interact strongly with the anion exchange column. Therefore, they will have minimal retention time on the column, regardless of the salt concentration in the mobile phase.

In conclusion, the retention of amino acids on an anion exchange column is dependent on the interaction between the charge of the amino acid and the resin of the column. By manipulating the salt concentration in the mobile phase, it is possible to elute amino acids of interest from the column, which can be useful in protein purification techniques.

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Answer: Saw

Explanation:

Pretty obvious

Answer:

Which tool likely made these marks?

O hammer

O file

O screwdriver

Explanation:

You're welcome.

Explanation:

0.5 mol HCl represents the amount of HCl in moles and 0.50 M HCl represents that there are 0.5 mol HCl per 1 L solution.

The form of the Arrhenius equation that can be conveniently used to calculate Ea for a reaction is the ln(k2/k1) = Ea/R * (1/T1 - 1/T2) form. This equation allows us to determine the activation energy (Ea) of a reaction by comparing the rate constants (k) of the reaction at two different temperatures (T1 and T2).

To calculate the activation energy (Ea) for a reaction, you can conveniently use the linear form of the Arrhenius equation. The linear form is given as:

ln(k) = -Ea/(R*T) + ln(A)

where:
- k is the reaction rate constant
- Ea is the activation energy
- R is the gas constant (8.314 J/(mol*K))
- T is the temperature in Kelvin
- A is the pre-exponential factor

To determine Ea, you can perform the reaction at different temperatures, measure the corresponding rate constants (k), and plot ln(k) against 1/T. The slope of the resulting line is equal to -Ea/R, from which you can calculate the activation energy (Ea) for the reaction.

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False. The equation AlCl4- + 2H+ = AlCl3 + H2O + HCl is balanced. This is due to the fact that two H+ ions are required to balance the -1 charge of AlCl4- and the charges on either side of the equation.

Due to differences in the amount of atoms of each element on the two sides, the above equation is not balanced. We must add coefficients to the reactants and products in order to balance it. We discover that two H+ ions are required to balance the charge on the AlCl4- ion after doing this. In addition, water (H2O) and HCl are also produced together with AlCl3. AlCl4-+2H+=AlCl3+H2O+HCl is the reaction's balanced equation. False. Because there are not an equal amount of atoms on both sides, the above equation is unbalanced. AlCl4- + 2H+ = AlCl3 + H2O + HCl is the balanced equation because two H+ ions are required to balance the charge on the AlCl4- ion and because the reaction also yields water and HCl.

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According to the Bohr model of the atom, the energies of the electrons around an atom are quantized. The Bohr model, proposed by Niels Bohr in 1913, was an early attempt to describe the structure of atoms.

In this model, an atom consists of a central nucleus surrounded by electrons orbiting in specific energy levels or shells.
Electrons in the Bohrs model can only occupy discrete energy levels, meaning they cannot have just any energy value; instead, their energies are quantized. The quantization of electron energy levels is based on the concept that electrons can only occupy orbits with specific, fixed distances from the nucleus. Each of these orbits corresponds to a specific energy level. Electrons can move between energy levels by absorbing or emitting energy in the form of photons, but they cannot exist in between these quantized energy levels.
The energy levels are often represented by the principal quantum number, n, which is a positive integer (n = 1, 2, 3, etc.). As the value of n increases, the energy of the electron in that orbit also increases, and the electron is found at a greater distance from the nucleus. Consequently, the energy levels get further apart as n increases.

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complete question:

According to the Bohr model of the atom, the energies of the electrons around an atom

a, have positive values.

b. are quantized.

c. equal n, the orbit number.

d. are quantificated.

e. get further apart as n increases

a)The balanced equation for the reaction described above is:

2NO(g) + 2CO(g) → N₂(g) + 2CO₂(g)

In this reaction, the carbon in CO is oxidized. We can determine this by analyzing the change in oxidation states.

In the balanced equation for the reaction, nitrogen monoxide (NO) and carbon monoxide (CO) combine to form nitrogen gas (N₂) and carbon dioxide (CO₂), which are both components of unpolluted air.

In the reaction, the carbon in CO is oxidized. This is because the oxidation state of carbon in CO is +2, while in CO₂ it is +4. This means that the carbon has gained two electrons, which is the definition of oxidation. Therefore, the carbon in CO is oxidized in the reaction.

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One mole of CaCl₂contains 2 moles of chloride ions.

Calcium chloride (CaCl₂) is a salt that consists of one calcium ion (Ca2+) and two chloride ions (Cl-). Therefore, one mole of CaCl₂ contains two moles of chloride ions (2 Cl-).

To calculate the number of moles of Cl- in one mole of CaCl₂, we can use the formula:

moles of Cl- = 2 x moles of CaCl₂

Since one mole of CaCl₂ contains 1 mol of calcium ion and 2 moles of chloride ions, the total number of moles in one mole of CaCl₂is:

1 + 2 = 3 moles

So, the number of moles of Cl- in one mole of CaCl₂ is:

moles of Cl- = 2 x moles of CaCl₂ = 2 x 1 = 2 moles

Therefore, one mole ofCaCl₂ contains 2 moles of chloride ions.

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Both calcium and magnesium reacts with water form their corresponding hydroxides along with the evolution of hydrogen gas. Calcium forms calcium hydroxide whereas magnesium forms magnesium hydroxide with water. But calcium reacts more violently with water.

The reactivity of metals depends on their capacity to lose electrons. The nucleus of calcium is farther away from the valence electrons and thus exert a smaller electrostatic pull on those electrons than the nucleus of magnesium.

Reactivity depends on ability to lose electrons. So calcium can lose electrons more easily and hence it is more reactive.

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Answer:

38.89302738712 litres

Explanation:

pv =nRT

V = nRT/p where R is the ideal gas constant R=8.314 J/mol·K

p in atm to p in pascal = x 101325

V = (102)(8.314)(316)/(68 x 101325)

V = 0.03889302739 m3

m3 to l = x 1000

0.03889302739 x 1000

V = 38.89302738712 litres

please mark my answer brainliest

The reaction is thermodynamically favored because it releases energy, which is indicated by the negative value of the change in enthalpy (∆H) of the reaction. This means that the products have a lower enthalpy than the reactants, making the reaction spontaneous and energetically favorable.

Additionally, the decrease in the disorder or randomness of the system (negative ∆S) is outweighed by the decrease in enthalpy, resulting in a negative change in Gibbs free energy (∆G) and indicating that the reaction will proceed in the forward direction.

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The correct answer is d) rate=k[A]². When we use the integrated rate law for second-order reactions, we assume a rate law that resembles rate=k[A]².  In this equation, the rate of the reaction is determined by the rate constant (k) multiplied by the concentration of the reactant A squared ([A]²). This is characteristic of second-order reactions.

This is because the rate of the reaction is proportional to the square of the concentration of the reactant A. By plotting the concentration of A versus time and using the integrated rate law equation for a second-order reaction, we can calculate the rate constant and determine the reaction order.

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The percent error for the mineral is 5.4%.

The absolute difference between the actual value and the experimental value is taken, divided by the actual value, and multiplied by 100 to provide the percent error, which is a measure of the precision of a measurement or calculation.

The percent error can be calculated using the formula:

Percent error = (|experimental value - actual value| / actual value) x 100%

Substituting the given values, we get:

Percent error = (|4.1 g/ml - 3.89 g/ml| / 3.89 g/ml) x 100%

Percent error = (0.21 g/ml / 3.89 g/ml) x 100%

Percent error = 0.054 x 100%

Percent error = 5.4%

Therefore, the percent error for the mineral is 5.4%.

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Based on their ability to absorb infrared light, chemical compounds may be recognised and described using infrared spectrum and infrared spectroscopy, a potent analytical technique.

IR spectroscopy may be used to validate the creation of acetylsalicylic acid (aspirin) and find any unreacted starting materials (salicylic acid and acetic anhydride) in the aspirin manufacturing process.

The characteristic salicylic acid absorption bands, which include a broad and strong peak in the 3300-2500 cm-1 range due to the O-H stretching vibration and a sharp peak at about 1700 cm-1 due to the C=O stretching vibration of the carboxylic acid group, would be visible in the IR spectrum as evidence of unreacted salicylic acid. Consequently, by contrasting the product's IR spectrum with other IR spectra.

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The correct answer is B. The half-life period of a zero order reaction is given by the equation 0.693/[A]k, where [A] is the initial concentration of the reactant and k is the rate constant for the reaction. This equation shows that the half-life period is independent of the initial concentration of the reactant, which is a characteristic of zero order reactions.

For a zero-order reaction, the half-life period is given by the following formula:

Half-life (t½) = [A₀] / 2k

Where:
- t½ is the half-life period
- [A₀] is the initial concentration of reactant A
- k is the rate constant for the reaction

So, the correct answer is:

D. 2[A]₀/k

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The net ionic equations are as follows:

a. [tex]OH^-(aq) + H^+(aq)[/tex] → [tex]H_2O(l)[/tex]

b. [tex]Ca(s) + 2H^+(aq)[/tex] → [tex]Ca^{2+}(aq) + H_2(g)[/tex]

c. [tex]Ca + 2HCl + 2H_2O[/tex] → [tex]Ca(OH)_2 + H_2[/tex]

a. The neutralization of NaOH with HCl can be represented by the following balanced chemical equation:

NaOH + HCl → NaCl + [tex]H_2O[/tex]

To write the net ionic equation, we need to show only the species that are involved in the chemical reaction. The complete ionic equation is:

[tex]Na^+(aq) + OH^-(aq) + H^+(aq) + Cl^-(aq)[/tex] → [tex]Na^+(aq) + Cl^-(aq) + H_2O(l)[/tex]

The net ionic equation is:

[tex]OH^-(aq) + H^+(aq)[/tex] → [tex]H_2O(l)[/tex]

b. The dissolution of calcium in acid can be represented by the following balanced chemical equation:

Ca + 2HCl → [tex]CaCl_2 + H_2[/tex]

To write the net ionic equation, we need to show only the species that are involved in the chemical reaction. The complete ionic equation is:

[tex]Ca(s) + 2H^+(aq) + 2Cl^-(aq)[/tex] → [tex]Ca^{2+}(aq) + 2Cl^-(aq) + H_2(g)[/tex]

The net ionic equation is:

[tex]Ca(s) + 2H^+(aq)[/tex] → [tex]Ca^{2+}(aq) + H_2(g)[/tex]

c. The dissolution of calcium in water can be represented by the following balanced chemical equation:

[tex]Ca + 2H_2O[/tex] → [tex]Ca(OH)_2 + H_2[/tex]

To combine equations a and b so they result in equation c, we can first write the net ionic equation for the neutralization of NaOH with HCl:

[tex]OH^-(aq) + H^+(aq)[/tex] → [tex]H_2O(l)[/tex]

Then, we can substitute [tex]OH^-[/tex] with Ca and [tex]H^+[/tex] with 2HCl from the net ionic equation for the dissolution of calcium in acid:

[tex]Ca(s) + 2H^+(aq)[/tex] → [tex]Ca^{2+}(aq) + H_2(g)[/tex]

The resulting equation is:

[tex]Ca + 2HCl + 2H_2O[/tex] → [tex]Ca(OH)_2 + H_2[/tex]

which represents the dissolution of calcium in water.

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a.)  The Volume of water displaced is  3 ml

b.)  The final density of the mineral is 4.1 g/ml.

(a) The volume of water displaced is the ratio of the volume containing mineral to the volume excluding mineral.

Volume of water displaced = Volume with mineral - Volume without mineral

Volume of water displaced = 53 ml - 50 ml

Volume of water displaced = 3 ml.

(b) The following formula can be used to determine the mineral's density:

Mass / Volume equals density.

The difference between the mass of the mineral and the mass without the mineral is the mass of the mineral.

Mass of mineral = Mass with mineral - Mass without mineral

Mass of mineral = 12.3 g - 0 g (since the mass without mineral is not given)

Mass of mineral = 12.3 g

By deducting the volume without the mineral from the volume with, one may determine the volume of the mineral.

Volume of mineral = Volume with mineral - Volume without mineral

Volume of mineral = 53 ml - 50 ml

Volume of mineral = 3 ml

Therefore, the density of the mineral is:

Density = Mass of mineral / Volume of mineral

Density = 12.3 g / 3 ml

Density = 4.1 g/ml

Therefore, the final density of the mineral is 4.1 g/ml.

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Answer:

The specific heat of the steel can be calculated using the formula:

Q = mcΔT

where Q is the heat transferred, m is the mass of the steel, c is the specific heat of the steel, and ΔT is the change in temperature.

First, calculate the heat transferred from the steel to the water:

Qsteel = mcΔT = (525 g)(c)(100 °C - 55 °C) = 27675c J

Next, calculate the heat transferred from the water to the steel:

Qwater = mcΔT = (375 g)(4.184 J/g. °C)(55 °C - 25 °C) = 50202 J

Since the heat lost by the steel is equal to the heat gained by the water:

Qsteel = Qwater

27675c J = 50202 J

c = 1.81 J/g. °C

Therefore, the specific heat of the steel is 1.81 J/g. °C.

Explanation:

Enabling auto-tagging allows for automatic tagging of certain attributes or information within a system or program.

This can save time and effort by eliminating the need for manual tagging and ensuring accuracy in the tagging process. Enabling auto-tagging is a process that allows an analytics or advertising platform to automatically assign tags to specific elements in a campaign or website. This helps in tracking and organizing data more efficiently, making it easier to analyze and optimize your online presence. When auto-tagging is enabled, the system will automatically generate and add tags to your URLs or content without the need for manual input, saving time and effort.

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The reaction between acetylene gas and oxygen gas results in the formation of carbon dioxide gas and water vapor. In the given reaction, acetylene (C₂H₂) is the limiting reactant, resulting in the production of 4 moles of carbon dioxide (CO₂). The moles of acetylene used in the reaction are 1.97, leading to the formation of 3.94 moles of CO₂.

The balanced chemical equation for the reaction is:

2 H₂ + 5 O₂ -> 4 CO₂ + 2 H₂O

Using the given amounts of acetylene and oxygen:

moles of C₂H₂ = / = 3.94

moles of O₂ = / = 68.97

The limiting reactant is acetylene since it produces fewer moles of product. Therefore, only half of the acetylene will be consumed in the reaction.

moles of C₂H₂ used = 3.94 / 2 = 1.97

Using the mole ratio from the balanced equation, the moles of CO₂ produced will be:

moles of CO₂ = 1.97 mol C₂H₂ × (4 mol CO2 / 2 mol C₂H₂) = 3.94 mol CO₂

Rounding to the nearest whole number, the answer is: 4 mol CO₂.

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The volume (in liters) of the the original solution that should be used is 0.578 Liter

The volume of the original solution that should be used can be obtained as follow:

Dilution equation is given as follow:

M₁V₁ = M₂V₂

Inputting the given parameters, we have:

14 × V₁ = 2.3 × 3.5

14 × V₁ = 8.05

Divide bioth sides by 14

V₁ = 8.05 / 14

V₁ = 0.578 Liter

Thus, from the above calculation, we can conclude that the volume of the original solution needed is 0.578 Liter

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The number indicates neutral on a pH scale is 7. Therefore the correct option is option E.

The acidity or basicity (alkalinity) of a solution is gauged using the pH scale. With 0 being the most acidic and 14 being the most basic, it has a range of 0 to 14.

Since a solution's pH is 7 or higher, it is regarded as neutral because it is neither acidic nor basic. The pH of pure water at normal temperature is 7, which is regarded as neutral.

While bases have a pH above 7, acids have a pH below 7, with lower numbers suggesting greater acidity and higher numbers indicating greater basicity. Therefore the correct option is option E.

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The rate of formation of [tex]H_{2}[/tex] is 0.45 min⁻¹

The balanced chemical equation is:

2 [tex]NH_{3}[/tex]→ [tex]N_{2}[/tex] + 3[tex]H_{2}[/tex]

From the equation, we can see that for every 2 moles of [tex]NH_{3}[/tex] consumed, 3 moles of H2 are formed. Therefore, the ratio of the rate of formation of [tex]H_{2}[/tex]to the rate of consumption of [tex]NH_{3}[/tex] is 3/2.

Given that [tex]NH_{3}[/tex] is being consumed at a rate of 0.30 min⁻¹, the rate of formation of [tex]H_{2}[/tex] can be calculated as follows:

Rate of formation of [tex]H_{2}[/tex] = (3/2) × Rate of consumption of [tex]NH_{3}[/tex]

Rate of formation of [tex]H_{2}[/tex] = (3/2) × 0.30 min⁻¹

Rate of formation of [tex]H_{2}[/tex] = 0.45 min⁻¹

Therefore, the rate of formation of [tex]H_{2}[/tex] is 0.45 min⁻¹

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