Niacin is one of the B vitamins. A 0.020 M solution of niacin has a pH of 3.26. What is the acid-dissociation constant for niacin? Find the percent dissociation (ionization).

Answer:

Using glucose to provide energy for the body

Explanation:

The pH of the buffer solution after 0.024 mol of Ba(OH)₂ are added is approximately 4.90.

To solve this problem, we need to use the Henderson-Hasselbalch equation, which relates the pH of a buffer solution to the concentrations of the weak acid and its conjugate base;

pH = pKa + log([base]/[acid])

where pKa will be the dissociation constant of the weak acid, [base] is the concentration of the conjugate base, as well as [acid] is the concentration of the weak acid.

From the given information, we can determine the pKa of the weak acid;

pH = 8.87 = pKa + log([base]/[acid])

pKa = 8.87 - log([base]/[acid])

pKa = 4.83

We can also determine the initial concentrations of the weak acid and its conjugate base.

[base] = 0.49 M

[acid] = 0.45 M

Now, we can use the balanced chemical equation for the reaction of Ba(OH)₂ with BH;

Ba(OH)₂ + 2BH → BaB₂ + 2H₂O

The moles of BH that react with the added Ba(OH)₂ is equal to half the moles of Ba(OH)₂ added, because the stoichiometry of the reaction is 2:1. Therefore, moles of BH consumed = 0.024 mol / 2 = 0.012 mol

The volume of the solution is given as 0.62 L, so the new concentration of BH is;

[acid] = (0.45 M x 0.62 L - 0.012 mol) / 0.62 L

[acid] = 0.441 M

The new concentration of B can be determined from the conservation of mass equation:

[base] + [BaB2] = constant

[base] + 0.012 mol / 0.62 L = constant

[base] = 0.49 M - 0.012 mol / 0.62 L

[base] = 0.470 M

Now, we can use the Henderson-Hasselbalch equation to determine the new pH of the buffer solution

pH = pKa + log([base]/[acid])

pH = 4.83 + log(0.470/0.441)

pH = 4.90

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Answer:

January = 45

May = 80

Explanation:

45 + 8 = 53

53 + 8 = 61

61 + 8 = 69 Round 70

70 + 8 = 78 Round 80

[RevyBreeze]

 Answer:     i might 45 and 110 because i think that it is adding or something

Explanation:

Answer:

C12H24

Explanation:

The molar mass of the CH2 unit is 14 g/mole.  The final molecule has multiples of CH2 so that it's molar mass is 168 g/mole.

(168 g/mole molecule)/(14 g/mole Unit) = 12 Units

12 CH2 units would make the molecualr formula:  C12H24

This is more than one structure that has this formula:  Cyclododecane and 1-Dodecene.

Answer:

mass

Explanation:

The triple beam balance is an instrument used to measure mass very precisely.

The correct ratio of moles of Ni²⁺ : PO₄³⁻  is 3 : 2.

The reaction of  Na₃PO₄ and NiCl₂ is given as :

Na₃PO₄   +  NiCl₂   ---->  Ni₃(PO)₂   +   NaCl

The balanced chemical equation between the Na₃PO₄ and NiCl₂   is given as :

2Na₃PO₄   +  3NiCl₂   ---->  Ni₃(PO)₂   +   6NaCl

The complete ionic equation between the Na₃PO₄ and NiCl₂   is given as :

6Na⁺   +  2PO₄³⁻  + 3Ni²⁺  + 6Cl⁻  --> Ni(PO₄)₂  +  6Na⁺  +  6Cl⁻

from the above equation it is clear that ratio of moles of Ni²⁺ : PO₄³⁻  is

3 : 2.

Thus , The correct ratio of moles of Ni²⁺ : PO₄³⁻  is 3 : 2.

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Answer:

B

Explanation:

The electrons are placed in 4 sublevels: s, p, d, and f. The sublevels contain orbitals and each orbital can carry maximum 2 electrons.

s is the lowest sublevel having only one orbital and can hold a maximum of 2 electrons; p has 3 orbitals and can carry a maximum of 6 electrons, d has 5 orbitals and can carry a maximum of 10 electrons; and f is the highest orbital having 7 orbitals and can hold maximum 14 electrons.

Hence, B is not one of the four sublevels that electrons can be placed in.

Holding 2 shield buttons at the same time will lock you in your shield and you can move it at any direction using the joystick (this could bounce projectiles off your shield).

Shield buttons refer to the two buttons located on the controller of a Nintendo Gamecube. They are used to activate the Shield feature in Super Smash Bros. games, which enables players to prevent harm from opponents' attacks by holding the shield button in place.What are bounce projectiles?Bouncing projectiles is the term for reflecting objects back at the opponent in Super Smash Bros. games.

Bouncing projectiles are a common technique used by players to repel an opponent's attack. To deflect projectiles in Super Smash Bros. games, you can use the Shield feature to absorb projectiles or bounce them back.

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As the fatty acid chain length increases, the melting point also increases. This is because longer chains have more van der Waals forces holding them together, which require more energy to break apart and therefore have a higher melting point.

On the other hand, the presence of double bonds decreases the melting point. This is because the kinks created by the double bonds make it more difficult for the chains to pack tightly together, leading to weaker van der Waals forces and a lower melting point.

Therefore, a fatty acid with a longer chain and more double bonds will have a lower melting point than a fatty acid with a shorter chain and fewer double bonds.



The trend in melting point with increasing fatty acid chain length is that the melting point increases. This is due to the increase in van der Waals forces holding the longer chains together, requiring more energy to break apart and resulting in a higher melting point. In contrast, increasing the number of double bonds decreases the melting point. The kinks created by the double bonds make it more difficult for the chains to pack tightly together, leading to weaker van der Waals forces and a lower melting point. Therefore, a fatty acid with a longer chain and more double bonds will have a lower melting point than a fatty acid with a shorter chain and fewer double bonds.


In summary, the trend in melting point with increasing fatty acid chain length is an increase, while the trend with increasing number of double bonds is a decrease. These trends are due to the effects of van der Waals forces and chain packing, which are influenced by chain length and degree of unsaturation.

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The respiratory system comprises the lungs, bronchial tubes, nose, and trachea.;damaged cilia can lead to chronic respiratory conditions such as COPD, emphysema, and asthma.

The cilia in the respiratory system are responsible for preventing dirt and mucus from entering the bronchial tubes and lungs. The cilia are a critical component of the respiratory system as they protect the lungs from dust, smoke, and other foreign particles. If the cilia are damaged, they can't perform their function effectively, which can lead to serious health problems. In this case, the person's bronchial tubes and lungs are most likely to be damaged. The cilia in the respiratory system are tiny hair-like structures that line the bronchial tubes, trachea, and other respiratory system structures. The cilia are responsible for filtering out harmful substances and excess mucus, which help keep the lungs and airways clean. They sweep the mucus and dirt up and out of the respiratory system and into the throat, where they can be swallowed or coughed up.If the cilia in the respiratory system are damaged, the person's bronchial tubes and lungs are more likely to be affected. The person may experience coughing, wheezing, and shortness of breath. The mucus buildup may also lead to infections such as bronchitis and pneumonia. In the long run, damaged cilia can lead to chronic respiratory conditions such as COPD, emphysema, and asthma. In conclusion,the cilia in the respiratory system play a critical role in keeping the airways clean. If the cilia are damaged, the person's bronchial tubes and lungs are most likely to be damaged. Therefore, it is essential to take proper care of the respiratory system to maintain optimal health.

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Answer:

1. A

2. B

3. Left/Reactants

Explanation:

UWU

Answer:

Question 1 : A

Question 2: B

Question 3: In this system, the equilibrium lies to the ✔ left,and the reaction favors the reactants.

Explanation:

Hope this helps.

Edge 2022

There are 0.303 moles of CO2 present in 0.550 L of a 0.550 M solution of CO2.

To calculate the number of moles of CO2 present in 0.550 L of a 0.550 M solution of CO2, we can use the following formula:

moles of solute = concentration (in M) x volume (in L)

Substituting the given values, we get:

moles of CO2 = 0.550 M x 0.550 L

moles of CO2 = 0.303 moles

Therefore, there are 0.303 moles of CO2 present in 0.550 L of a 0.550 M solution of CO2.

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The student collected data on the mass of each artificial cell. The student predicted that the cell in the beaker with 25% sugar solution would have the greatest change in mass after 24 hours. The student's prediction would be correct.

The artificial cell placed in the beaker with 25% sugar solution would likely have the greatest change in mass after 24 hours because of osmosis.

Osmosis is the movement of water across a semi-permeable membrane from an area of high water concentration to an area of low water concentration. In this case, the artificial cell has a semi-permeable membrane that allows water to pass through, but not sugar.

The 25% sugar solution in the beaker is less concentrated than the sugar solution inside the artificial cell, so water will move from the beaker into the cell, causing the cell to swell and increase in mass.

On the other hand, the artificial cells in the beakers with 0% and 12.5% sugar solutions will have less of a change in mass as the solution outside of the cell is more concentrated than inside the cell.

Therefore, the correct answer is as given above

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Answer:

Hint: We can say that several atoms don't contain eight electrons in their outermost electron shell. A few atoms contain a couple of electrons in their external shell, while a few atoms need just a couple of electrons to have an octet. We have to know in situations where atoms contain three or less outermost electrons, the atoms may lose those outermost electrons effectively until what stays is a lower shell which comprises an octet.

Explanation:

Complete step by step answer:

We have to know that an ion is a molecule, iota or atom with a net electrical charge. A cation is a particle that is positively charged and it contains fewer electrons than protons while an anion is a particle which is negatively charged and it has a larger number of electrons than protons.

We know that non-metals are found in the right hand side of the Periodic Table.

Since we add electrons to a similar outermost shell, and we additionally add protons to the core, atoms overall go through a compression in radius of atom, with the smallest particles to one side of the Periodic Table.

Hence components to the right side of the Periodic Table, fluorine, chlorine, oxygen, have the ability to oxidize, for example they gain density of electrons as an outcome of their unshielded atomic charge.

Furthermore, nitrogen, oxygen, fluorine, chlorine, and so forth has to ability negative particles.

For example, we have to know that the anion formed by nitrogen is N3−

.

Similarly, the anion formed by oxygen is O2−

, the anion formed by fluorine is F−

, the anion formed by chlorine is Cl−

.

The type of atoms which forms negative ions is nonmetals

Note: We have to know that ionic holding is the fascination among emphatically and contrarily charged particles. These oppositely charged particles pull in one another to result in ionic networks that are inverse charges draw in and like charges repulse. When several charges get attracted to one other, large ordered crystal lattices are formed. In those lattices, each ion is enclosed by ions that are oppositely charged.

Answer:

Outer planets are significantly colder than other planets! The answer is B.

Explanation:

The main difference between inner and outer planets is that inner planets have a high temperature compared to outer planets.

Answer:

5.60162×10^−3

Answer:

propa-1-nol

Explanation:

easy clapp

Ethyl butyrate have one oxygen is an Aldehyde and isovaleric Acid have two oxygen is an carboxylic acid

Ethyl Butyrate is an ester with a molecular formula of C₆H₁₂O₂ and  Isovaleric Acid is a carboxylic acid with a molecular formula of C₅H₁₀O₂.

In chemistry, an ester can be described as a compound derived from an oxoacid in which at least one hydroxyl group (-OH) is replaced by an alkoxy group (-O-R), as in the substitution chemical reaction of a carboxylic acid and an alcohol. But the carboxylic acid contains a carboxyl group (C(=O)OH) attached to an R-group.

Glycerides can be defined as fatty acid esters of glycerol and are one of the main classes of lipids and comprise the bulk of vegetable oils and animal fats.

Esters can be derived from carboxylic acids and are more frequently  IUPAC nomenclature used for esters, based on the name for the acid followed by the suffix "-oate".

The chemical formulas of organic esters generally take the form RCO₂R’, where R and R′ are usually the hydrocarbon parts of the carboxylic acid and the alcohol respectively.

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Answer:

lol thanks for the 10

Explanation:

Answer:

it is because non living things are not alive and it cannot be

Explanation:

because cells are the building thing of a living thing it is the most particular and simple reason but if you go deeper it consist of things called DNA which is a strips of protein that determines the info of a living things thats why if there is a reasoning that a nonliving things have cell its not.. thats all .

A double bond in a hydrocarbon chain of a fatty acid can influence the dispersion forces that can form between the hydrocarbon chains by decreasing the strength of the dispersion forces.

Dispersion forces, also known as van der Waals forces, are the weakest type of intermolecular forces that occur between molecules. These forces are caused by temporary dipoles that form when electrons in the molecules move around.

In a hydrocarbon chain with only single bonds, the chain is able to pack closely together, allowing for stronger dispersion forces between the chains. However, when there is a double bond present in the chain, it creates a kink or bend in the chain, preventing it from packing as closely with other chains. This decreases the strength of the dispersion forces between the chains.

Therefore, the presence of a double bond in the hydrocarbon chain of a fatty acid can decrease the strength of the dispersion forces between the chains, leading to weaker intermolecular forces and potentially different physical properties, such as a lower melting point.

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From the arrangement of the options,  Solution A and Solution D are unsaturated.

In a saturated solution, the rate at which the solute dissolves equals the rate at which it precipitates or crystallizes. This indicates that under the existing circumstances, no more solute can be dissolved in the solvent.

Solution A:

Amount of solute added: 20 g

Solubility of solute: 37 g/100 g H₂O

Since the amount of solute added is less than the solubility, Solution A is unsaturated.

Solution D:

Amount of solute added: 7 g

Solubility of solute: 4 g/100 g H₂O

The amount of solute added is less than the solubility, so Solution D is unsaturated.

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Ten radish seeds were added to container A. Container B had no radish seeds. The purpose of the container B in this experiment is to serve as a control container.

By using controls, the experimenter can reduce the impact of factors other than the one being researched. This allows us to verify that an experiment is testing what it says it is testing. Controls are important for all sorts of experimental testing, regardless of the subject, and this goes beyond science.

Methylene blue is usually employed as a redox indicator in analytical chemistry. The solutions of this chemical are blue when in an oxidizing environment, but turn colorless when exposed to a reducing agent.

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Answer:

Protons (Hydrogen Ions) transfer between conjugate acid-base pair.

Explanation:

By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.

Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.

Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.

Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.

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Answer:

Explanation:She was wrong

Answer:

Uranus

Explanation: Earth's distance from the Sun is about 150 million kilometers. Dividing Earth's distance to sun with the Uranus' distance to the Sun will give us the quotient of 20. Hence, Uranus is the planet that is 20 times farther from the Sun than the Earth is.

The extremophile that has evolved in conditions of extreme drought is the xerophile, while the extremophile that has evolved in conditions of extreme salt is the halophile.

Extremophiles are organisms that thrive in extreme environments, where most other life forms cannot survive. They have developed unique adaptations to withstand and thrive in these extreme conditions. Two types of extremophiles specifically adapted to different extreme environments are xerophiles and halophiles.

Xerophiles are extremophiles that have evolved to survive in conditions of extreme drought. They are adapted to environments with very low water availability or high water stress. These organisms have developed mechanisms to prevent water loss, such as efficient water retention and protection of cellular structures. Xerophiles can be found in desert environments and other arid regions.

On the other hand, halophiles are extremophiles that have evolved to live in conditions of extreme salt concentration. They are adapted to environments with high salinity, such as salt flats, salt lakes, and hypersaline environments. Halophiles have specialized adaptations to cope with the osmotic stress caused by high salt concentrations. They have enzymes and transport proteins that function in high-salt environments and can maintain osmotic balance within their cells.

In summary, xerophiles have evolved in conditions of extreme drought, while halophiles have evolved in conditions of extreme salt. These extremophiles showcase remarkable adaptations to thrive in their respective harsh environments.

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The correct order of compounds from bottom to top while running a TLC plate is:

TLC is short for thin-layer chromatography, a technique for the separation of substances based on their mobility on solvents. TLC plate is a sheet of metal, glass, or plastic coated with a thin layer of a solid adsorbent.

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Answer:

Fossil fuel

Explanation:

Answer:

2

Explanation:

Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs.