keep these values in mind for the remaining questions: kb for cn− is 2.0×10−5 . ka for nh4 is 5.6×10−10 . ka for hf is 6.6×10−4 . part b identify the following salts as neutral, acidic, or basic.

Among the given weak bases, aniline is the weakest electrolyte in an aqueous solution.What is an electrolyte?An electrolyte is a substance that conducts electricity in an aqueous solution or in a molten state.

In water, they break up into ions and conduct electricity. Electrolytes may be categorized into two types: strong and weak electrolytes. Strong electrolytes dissociate completely into ions in aqueous solution, whereas weak electrolytes only partially dissociate into ions and exist in equilibrium with undissociated molecules. In the given weak bases, aniline is the weakest electrolyte.

Here's how to solve the problem: Aniline has a Kp of 4.0 × 10-10, which is the smallest value of Kp among all the given weak bases. Therefore, aniline is the weakest electrolyte in an aqueous solution.

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The mole fraction of solute in a 3.20 m aqueous solution is approximately 0.982.

Mole fraction (X) of solute is the number of moles of solute per number of moles of solute and solvent combined.

The formula for calculating mole fraction is:

                                          mole fraction (X) = moles of solute / (moles of solute + moles of solvent)

The given solution has a molarity of 3.20 M.

Therefore, the number of moles of solute is 3.20 moles per liter of solution.

The solvent is water, whose number of moles is given by the formula:

                             moles of solvent = volume of solution × density of water ÷ molar mass of water

Here, density of water is 1.00 g/mL and the molar mass of water is 18.015 g/mol.

Therefore, the number of moles of solvent is:

                                  moles of solvent = (1.00 × 10³ g/L) × (1 L/1000 mL) × (1 mol/18.015 g)

                                                         = 0.0555 moles/L

Thus, the total number of moles in the solution is:3.20 moles + 0.0555 moles = 3.26 moles

The mole fraction of the solute is:mole fraction (X) = 3.20 moles / 3.26 moles = 0.982.

Therefore, the mole fraction of solute in a 3.20 m aqueous solution is approximately 0.982.

The mole fraction of solute in the given solution is 0.982.

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Answer:

Thermal Energy, also known as random or internal Kinetic Energy, due to the random motion of molecules in a system. Kinetic Energy is seen in three forms: vibrational, rotational, and translational. Vibrational is the energy caused by an object or molecule moving in a vibrating motion, rotational is the energy caused by rotating motion, and translational is the energy caused by the movement of one molecule to to another location.

If a few drops of HCI are added (which dissociates into H+ and Cl-) to both beakers, the pH in Solution X will decrease and the pH in Solution Y will remain unaffected. The pH scale is a scale that measures the acidity or basicity of a solution. It goes from 0 to 14, with 7 being neutral.

The lower the pH, the more acidic the solution is. Similarly, the higher the pH, the more alkaline the solution is. Each unit on the pH scale represents a tenfold difference in acidity or alkalinity. This implies that a solution with a pH of 3 is ten times more acidic than one with a pH of 4.Let's apply this information to your problem. We'll look at each solution one by one: XIt has a pH of 8, which indicates that it is slightly basic. HCI (hydrochloric acid) is added to it, which dissociates into H+ and Cl-.

The H+ ions will react with the OH- ions in the solution to form water molecules. There are few OH- ions in Solution X because it is slightly basic. As a result, the amount of H+ ions produced will be significant compared to the OH- ions, lowering the pH. As a result, the pH of Solution X will decrease.SOLUTION YIt has a pH of 3, which indicates that it is highly acidic. HCI (hydrochloric acid) is added to it, which dissociates into H+ and Cl-.The H+ ions produced will simply join the H+ ions already in Solution Y. As a result, the pH of Solution Y will remain unaffected by the addition of HCI.

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Part A: If D was removed, the equilibrium would have shifted towards the product, given the proposed change.

There are various ways to stress an equilibrium. One tactic is to alter the reactant or product of a chemical reaction after it reaches equilibrium. More product is added to reduce the tension, which shifts the equilibrium to reactants. The equilibrium shifts when a reactant or product is removed, producing more of the removed reactant or product, respectively.

As we stress a chemical reaction, it loses equilibrium and starts to migrate back towards equilibrium in a way that lessens the stress. Le Chatelier's principle is the name given to the formal formulation, which states that if an equilibrium is stressed, the reaction will change to reduce the stress.

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Correct question is:

For the following reaction, determine which way the equilibrium would shift, toward the products or toward the reactants, given the proposed change. Assume the reaction is endothermic.

A + B → C + D

Part A: If D was removed

Part B: If more B was added to the reaction

Part C: If the reaction was heated

Answer: Cost begins at $2,999 for a .1 carat blue, yellow or colorless diamond.

Explanation:

Answer:

The cost for turning ashes into diamonds varies based on the carat size and diamond color you want. Cost begins at $2,999 for a.1 carat blue, yellow or colorless diamond. Cost goes up based on the amount of time the diamond is in the machine since we can only grow one diamond at a time

Explanation:

Answer:

I believe the Answer is B

Answer:

70%of 2000 = 1400

2000 tonnes of hematite contains 1400 tonnes iron oxide .

1400 tonnes of fe2O3

fe2O3 have molar mass 159.69

calculate moles = given mass/molar mass

moles = 1400000000/159.69

moles = 8766986

one mole contains = 112 g of fe

so 8766986 moles will contain = 112×8766986

= 981,902,432 grams of ferrous

which is nothing but equal to 981.90 tonnes of iron!!

The millimolar concentration of Al3+ in the solution is 0.045 M.

To find the number of moles of Al2(SO4)3-18H2O, we first need to calculate the mass of 2 grams of this compound. Since the molar mass of Al2(SO4)3-18H2O is 666.44 g/mol, we can calculate the number of moles as follows:

2 g / 666.44 g/mol = 0.003 moles of Al2(SO4)3-18H2O

The aluminum sulfate octadecahydrate fully dissociates in water, and each formula unit yields 3 aluminum ions (Al3+). Therefore, the number of moles of aluminum ions is:

0.003 moles Al2(SO4)3-18H2O x 3 moles Al3+/1 mole Al2(SO4)3-18H2O = 0.009 moles Al3+

The volume of the solution is given as 200 ml, which is equal to 0.2 liters.

Therefore, the millimolar concentration of Al3+ is:0.009 moles Al3+ / 0.2 L = 0.045 M

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False. Pressure has a direct impact on the solubility of liquids and solids. Increasing pressure raises the solubility of a given substance, while decreasing pressure reduces it. This is because higher pressure forces molecules closer together, making it easier for them to dissolve in a solvent.

The effect of pressure on the solubility of liquids and solids is an important factor to consider in many industrial processes. When the pressure is increased, the solubility of a given substance increases as well, due to the increased force between molecules which makes it easier for them to dissolve in a solvent.

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The reaction between an asymmetrical alkyne and one equivalent of hydrogen halide (HX) typically leads to the formation of a mixture of two or more products, depending on the structure of the alkyne and the specific halogen acid used.

The major product formed in this reaction is usually the addition product, where the HX molecule adds across the triple bond of the alkyne to form a halogenated alkene.

The position of the halogen atom in the product depends on the nature of the alkyne and the specific halogen acid used.

For example, if we consider the reaction between propyne and HCl, the major product formed is 2-chloropropane, which is an alkene with the Cl atom added at the terminal carbon atom.

The minor product formed in this reaction is usually the isomerization product, where the triple bond of the alkyne is shifted to form a new triple bond between the two adjacent carbon atoms.

This reaction is also known as tautomerization, and it results in the formation of an internal alkyne.

For example, if we consider the reaction between propyne and HBr, the minor product formed is 1-bromopropene, which is an alkene with the Br atom added at the internal carbon atom.

Overall, the reaction between an asymmetrical alkyne and HX leads to the formation of a mixture of two or more products, with the addition product being the major product and the isomerization product being the minor product.

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Answer:

1.1 × 10²⁴ atoms Mg

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify

[Given] 1.8 mol Mg

[Solve] atoms Mg

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.08396 × 10²⁴ atoms Mg ≈ 1.1 × 10²⁴ atoms Mg

Answer:  1.0836 * 10^24 atoms

This value is approximate

===========================================================

Explanation:

1 mole = 6.02*10^23 atoms approximately

This applies to any element.

Multiply both sides by 1.8 and we get...

1 mole = 6.02*10^23 atoms

1.8*1 mole = 1.8*6.02*10^23 atoms

1.8 mole = 10.836*10^23 atoms

1.8 mole = (1.0836*10)*10^23 atoms

1.8 mole = 1.0836 * 10^(1+23)

1.8 mole = 1.0836 * 10^24 atoms

Answer:

B

Explanation:

IM A CHEMISTRY WIZZZZ

:)

I hope u get full marks on your paper/test/quiz or whatever!

There is a 20 percent chance so stay positive!

Answer:

D

Explanation: ultraviolet rays are harmful to humans

Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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The synthesis of acetaminophen from p-aminophenol and acetic anhydride involves an acylation reaction. Here is a simplified mechanism for the synthesis:

Step 1: Protonation of the p-aminophenol: In the presence of an acid catalyst, such as sulfuric acid (H2SO4), the p-aminophenol molecule is protonated, resulting in the formation of the p-aminophenol cation (p-AP+). Step 2: Formation of the acylium ion: Acetic anhydride is then added to the reaction mixture. The acetic anhydride molecule loses one of its oxygen atoms, forming an acylium ion (CH3CO+). Step 3: Nucleophilic attack: The lone pair of electrons on the nitrogen atom of the p-aminophenol cation (p-AP+) acts as a nucleophile and attacks the electrophilic carbon of the acylium ion (CH3CO+). This results in the formation of a new bond between the nitrogen atom and the carbon atom of the acylium ion, while one of the oxygen atoms of the acylium ion is displaced.Step 4: Proton transfer: A proton transfer occurs from the oxygen atom of the acylium ion (now attached to the nitrogen atom) to a nearby molecule or solvent, regenerating the aromaticity of the phenyl ring. Step 5: Tautomerization: The resulting intermediate undergoes tautomerization, where a hydrogen atom is transferred from the hydroxyl group to the adjacent nitrogen atom. This forms the final product, acetaminophen.

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(1) The two half-cell reactions are:

Cd(s) -> Cd2+(aq) + 2e-

2Ag+(aq) + 2e- -> 2Ag(s)

(2) The net reaction is:

Cd(s) + 2Ag+(aq) -> Cd2+(aq) + 2Ag(s)

In the first half-cell reaction, solid cadmium (Cd) is oxidized to form cadmium ions (Cd2+) and two electrons (2e-). In the second half-cell reaction, silver ions (Ag+) are reduced to form solid silver (Ag) and two electrons (2e-).

To combine the two half-cell reactions and determine the net reaction, the electrons on both sides must be balanced. Since two electrons are produced in the first reaction and two are consumed in the second reaction, they cancel out. Thus, the net reaction involves the solid cadmium reacting with silver ions to form cadmium ions and solid silver.

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Answer: 140

Explanation:

Given the following :

Mass of metal = 18g = 0.018kg

Mass of water (calorimeter) = 21g = 0.021kg

Initial temperature of metal = 273 + 96 = 369k

Initial temperature of water = 273 + 24 = 297k

Final temperature inside calorimeter = 273 + 26 = 299k

Temperature change of metal = 299 - 369= -70k

Temperature change of water = 299 - 297 = 2k

H = mc ΔT

m = mass

c = specific heat capacity

ΔT = change in temperature

Heat lost by metal = heat gained by water

mc ΔT = mc ΔT

Specific heat capacity of water = 4200

18 * C * ( 299 - 369 ) = 21 * 4.2 * ( 299 - 297)

0.018 × C × -70 = 0.021 × 4.2 × 2

- 1.26 × C = 0.1764

C = 176.4/1.26

C = 140

Option A: 0.81 moles of CO2 are present in 4.9 × 10²³ molecules of CO₂, whhich can be find using the conversion factor of Avogadro number.

Given that there were more carbon atoms than Avogadro predicted, there are more than one mole of carbon atoms. The calculation's outcome is rounded to three significant figures since Avogadro's number is a measurable quantity with three significant figures.

To find the number of moles in a given quantity of molecules of a compound, we can use the following formula:

Number of moles = Number of molecules given/ Avogadro Number

It can be abbreviated as:

\(n = N/N_{A}\)

Therefore,

n = 4.9 × 10²³/ 6.023 × 10²³

= 0.81 moles

Hence, 0.81 moles of CO2 are present in 4.9 × 10²³ molecules of CO₂.

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Answer:

I need more points but I think it is 84737

Explanation:

Answer: The number of neutrons will increase as we move from left to right in a periodic table.

Explanation:

Atomic number is equal to the number of protons.

Mass number is the sum of number of neutrons and number of protons.

As we move from left to right, both the atomic number and mass number increases.

For example: As we move from Lithium to berrylium to boron to carbon to nitrogen to oxygen to fluorine to neon , the number of neutrons increase from 4 to 5 to 6 to 6 to 7 to 8 to 10 to 10.

Thus the number of neutrons will also increase as we move from left to right in a periodic table.

The energy needed to start a chemical reaction is called activation energy. The correct option is (3).

Activation energy refers to the minimum amount of energy required for a chemical reaction to begin or proceed. It acts as a barrier that needs to be overcome for reactant molecules to transform into products.

In order for a reaction to occur, the reactant molecules must have sufficient energy to surpass this energy barrier. Activation energy can be thought of as the "hurdle" that reactant molecules must jump over to initiate a chemical reaction.

Once the reaction is initiated and the activation energy is surpassed, the reactants undergo a series of bond-breaking and bond-forming processes, releasing or absorbing energy in the form of heat. Activation energy is a critical factor in determining the rate of a chemical reaction. Therefore, the correct option is (3).

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The pH of the solution is 8.26. Solutions have several important properties, such as the concentration of the solute, which is typically expressed as molarity.

What is Solution?

A solution is a homogeneous mixture of two or more substances where the molecules of the substances are evenly distributed at the molecular level. In a solution, the substances involved can be in any state of matter, but the resulting mixture is always in a single phase.

The reaction consumes OH- ions and produces acetate ions, so the concentration of OH- ions in the final solution will be lower than 0.100 M.

The balanced equation for the reaction between acetic acid and OH- is:

\(CH_3COOH\) + OH- → \(CH_3COO-\)\(CH_3COO-\) +\(H_2O\)

The initial concentration of acetic acid is 0.10 M, but some of it will react with the OH- ions from KOH, so we need to calculate the equilibrium concentration of acetic acid using the Ka value:

\(Ka = [][H_3O+]/[CH_3COOH\)]

Assuming that x is the concentration of \(H_3O+\) ions formed, and that the initial concentration of acetic acid is 0.10 M - x, we can write:

1.8 x \(10^{-5}\) = x²/(0.10 - x)

Solving for x gives x = 1.34 x \(10^{-4}\)M.

Therefore, the concentration of \(H_3O+\) ions in the solution is 1.34 x \(10^{-4}\)M, and the pH is:

\(pH = -log[H_3O+] = -log(1.34 x \(10^{-4}) = 8.26\)

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Answer:

t = 42.4 years

Explanation:

To find the amount of time needed for the sample to decay, you need to use the half-life equation:

\(N(t) = N_0(\frac{1}{2})^{t/h}\)

In this equation,

-----> N(t) = final mass (mg)

-----> N₀ = initial mass (mg)

-----> t = time passed (yrs)

-----> h = half-life (yrs)

You can find how much time passed by plugging the given variables into the equation and solving for "t". The final answer should have 3 sig figs like the given values.

N(t) = 9.38 mg                       t = ? yrs

N₀ = 25.0 mg                        h = 30.0 yrs

\(N(t) = N_0(\frac{1}{2})^{t/h}\)                                <----- Half-life equation

\(9.38mg = 25.0mg(\frac{1}{2})^{t/30.0yrs}\)              <----- Insert variables

\(0.3752 = (\frac{1}{2})^{t/30.0yrs}\)                          <----- Divide both sides by 25.0 mg

\(ln(0.3752) = ln((\frac{1}{2})^{t/30.0yrs})\)              <----- Take the natural log of both sides

\(ln(0.3752) = \frac{t}{30.0yrs} ln(\frac{1}{2})\)                   <----- Rearrange the exponent

\(-9.803 = \frac{t}{30.0yrs} (-0.6931)\)                 <----- Solve the natural logs

\(1.1414= \frac{t}{30.0yrs}\)                                  <----- Divide both sides by -0.6931

\(42.4 yrs= t\)                                        <----- Multiply both sides by 30.0 yrs

Answer:

Hence, number of moles of oxygen in 5 moles of co=5. The number of oxygen atoms present can be obtained by multiplying the moles of oxygen by avogadro's number. so, number of oxygen atoms present =5(6.023× 10²³) =.115×10²³ nos

Answer: The molarity of the K2CO3 solution is 0.625 M.

Explanation: To find the molarity of a solution, you need to know the moles of solute and the volume of the solution in liters. Here's how to solve the problem:

Calculate the moles of K2CO3 using its given mass and molar mass:

moles = mass / molar mass = 93.1 g / 136.21 g/mol = 0.682 mol

Calculate the volume of the solution in liters:

volume = 1.09 L

Calculate the molarity of the solution using the moles and volume:

molarity = moles / volume = 0.682 mol / 1.09 L = 0.625 M