2. Draw the Lewis dot structures for each of the following molecules:
a. H₂S
C. SO3
b. CH₂Br₂
d. HCN

Answer:

a) Ethanol + K2Cr2O7 / H+ / Reflux → Acetaldehyde

CH3CH2OH + [O] → CH3CHO

b) Ethanol + K2Cr2O7 / H+ / Distil → Ethene

CH3CH2OH + [O] → CH2=CH2 + H2O

c) Propan-1-ol + K2Cr2O7 / H+ / Reflux → Propanal

CH3CH2CH2OH + [O] → CH3CH2CHO

d) Propan-2-ol + K2Cr2O7 / H+ / Reflux → Propanone (acetone)

(CH3)2CHOH + [O] → (CH3)2CO

e) 3-Methylbutan-1-ol + K2Cr2O7 / H+ / Reflux → 3-Methylbutanal

CH3CH(CH3)CH2CH2OH + [O] → CH3CH(CH3)CH2CHO

f) 4-Chloropentan-1-ol + K2Cr2O7 / H+ / Distil → 4-Chloropentanal

Cl(CH2)3CH2CH(OH)CH3 + [O] → Cl(CH2)3CH2CH=O + H2O

(please could you kindly mark my answer as brainliest)

The potential of a standard hydrogen (S.H.E.) electrode under the given conditions is -0.126V.

A standard hydrogen electrode (SHE) is a reference electrode used to estimate the standard electrode potentials (E°) of half-reactions. It is made up of a platinum electrode coated in platinum black (Pt) and a hydrogen (H2) electrode dipping into an acidic solution of HCl. The pressure of H2 is measured at 1.0 atm, and the concentration of H+ is maintained at 1.0 mol/L. The potential of the SHE is set to 0.000 V at all temperatures, and other electrode potentials are compared to it to determine their standard reduction potentials.

Using the Nernst equation, we can compute the potential of the SHE : E = E° - (RT/nF)lnQ, where E is the cell potential, E° is the standard cell potential, R is the gas constant, T is the temperature, n is the number of moles of electrons transferred in the redox reaction, F is the Faraday constant, and Q is the reaction quotient.

The given conditions[H+] = 0.77 MPH2 = 1.4 atm T = 298 K

We can use the Nernst equation to calculate the potential of the SHE under these conditions as follows:

E = E° - (RT/nF)lnQ,

where  E° = 0.000 VR = 8.314 J/(mol*K)n = 2 F = 96,485 J/V*KpH2 = 1.4 atm

Q = [H+]2/[H2]E = E° - (RT/nF)lnQ= 0.000 - (8.314*298/2*96,485)*ln (0.77/1.4^2)= 0.000 - 0.000688= -0.126 V

Therefore, the potential of the standard hydrogen electrode (SHE) under the given conditions would be -0.126 V.

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To solve this problem, we need to use the concept of solubility and saturation. Solubility is the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature.

The first step is to determine the solubility of potassium nitrate at 95°C and 35°C. According to the solubility chart, the solubility of potassium nitrate is 247 g/L at 95°C and 32 g/L at 35°C.

Next, we need to calculate how much potassium nitrate is dissolved in the 100 grams of water at 95°C. The solubility of potassium nitrate at 95°C is 247 g/L, so in 100 grams of water, we can dissolve:

(247 g/L) x (100 g / 1000 mL) = 24.7 g of potassium nitrate

Therefore, we have a saturated solution of potassium nitrate with 24.7 grams of potassium nitrate dissolved in 100 grams of water.

When the solution is cooled to 35°C, the solubility of potassium nitrate decreases to 32 g/L. Since we have more than 32 grams of potassium nitrate dissolved in the solution, the excess will precipitate out of the solution. The amount of potassium nitrate that will precipitate can be calculated by subtracting the solubility at 35°C from the initial concentration:

24.7 g - (32 g/L) x (100 g / 1000 mL) = 18.3 g

Therefore, 18.3 grams of potassium nitrate will precipitate out of the solution when it is cooled from 95°C to 35°C.

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The beaker that best represents a saturated solution is the one in which the solution is at its maximum level of solubility, meaning it cannot dissolve any more solute at the same temperature.

Saturated solutions are solutions in which no more solute can dissolve in the solvent at the same temperature. A solution is a homogeneous mixture composed of a solvent and a solute.

The solvent is the major component of the solution, and the solute is the minor component. The solute dissolves in the solvent to create a homogeneous solution.

A solution is said to be saturated when it has the maximum amount of solute that can dissolve in it at the same temperature. If the temperature changes, the solubility of the solute will also change, and the solution will become unsaturated or supersaturated.

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Lewis acids; Fe^3+, SO3, NO2, CO

Lewis base; (CH3)2NH, H^-, Br^-

In chemistry, a Lewis acid is a substance that can accept a pair of electrons (a Lewis base) to form a covalent bond. This concept was introduced by American chemist Gilbert N. Lewis in 1923. A Lewis acid is also defined as an electron pair acceptor, which means that it can form a bond by accepting a pair of electrons from another molecule or ion.

A Lewis base, on the other hand, is a substance that can donate a pair of electrons (a Lewis acid) to form a covalent bond.

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Answer:

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The pKb value of codeine (C₁₈H₂₁NO₃) is 5.80. This drug is a narcotic pain reliever that forms a salt with HCI and its pH is around 8.00.

The following equation is used: pKa + pKb = pKw

where, pKa is the acid dissociation constant and pKw is the self-ionization constant of water. pKa can be calculated as follows:

pKa = pKb + pKw - pH

Since the drug is a weak base, Kb (base dissociation constant) can be calculated as follows: Kb = Kw/Ka

Kb = 1.00 × 10⁻¹⁴/2.3 × 10⁻⁶

Kb = 4.35 × 10⁻⁹

The following equation can now be used to find the value of pH:

pKb + pKa = pKw

pH = pKw - pKb - pKa

pH = 14.00 - 5.36 - (-9.36)

pH = 8.00

Therefore, the pH of 0.036 M codeine hydrochloride is 8.00.

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Biurets reagent is a solution of potassium hydroxide and copper sulfate used to measure the concentration of proteins. The reagent works by breaking down peptide bonds and creating a pink or purple solution when proteins are present. The absorbance of 550 nm is used to quantify the protein concentration because it is the wavelength that best corresponds to the color change of the solution.

Biurets reagent is a solution containing copper sulfate, sodium hydroxide, and potassium sodium tartrate. The copper ions in the biuret reagent combine with the peptide bonds present in proteins, forming a violet-colored complex. The intensity of the violet coloration is proportional to the concentration of proteins in the sample being analyzed. Absorbance at 550 nm is used to quantify protein concentration because this is the wavelength at which the violet color produced by the copper ion-peptide bond complex has maximum absorbance. By measuring the absorbance at this wavelength, the concentration of the protein in the sample can be determined through a standard curve that relates the absorbance values to known protein concentrations. The biuret test is commonly used to determine protein concentration in a variety of biological and chemical samples. The test is widely used because it is relatively simple and can be performed quickly. The biuret test is often used in combination with other analytical techniques to obtain more detailed information about protein samples.

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The condition that Carbon dioxide gas is most soluble in water is under: 4. low temperature and high pressure

Carbon dioxide gas is most soluble in water under conditions of low temperature and high pressure, which causes the gas molecules to dissolve more readily into the water molecules.

This is because the solubility of a gas in water is dependent on factors such as temperature, pressure, and the nature of the gas and solvent. At higher temperatures, the kinetic energy of the gas molecules increases, causing them to move more rapidly and escape from the water more easily, while at lower temperatures, the solubility of the gas increases.

Similarly, at higher pressures, more gas molecules are forced into contact with the water, increasing the likelihood of dissolution.

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The given statement is true that nonenzymatic E1 reactions can often result in a mixture of more than one alkene product. This is due to the presence of different possible elimination products.

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The pH in the intermembrane space of the mitochondria should be lower compared to the matrix due to the C. higher concentration of protons in the intermembrane space.

Mitochondria are organelles found in eukaryotic cells that play a vital role in producing the energy required to sustain cellular activity. Mitochondria produce energy from food and oxygen, which they use to generate ATP, the primary source of cellular energy.

The intermembrane space (IMS) is the region between the mitochondrial inner and outer membranes. The pH of the intermembrane space is significantly lower than that of the matrix due to the higher concentration of protons in the intermembrane space.

The pH gradient of the mitochondria enables the generation of ATP from ADP and Pi by ATP synthase, which pumps protons from the intermembrane space to the matrix, making the pH gradient a source of energy. The proton gradient generated by ATP synthase is used for ATP synthesis. Therefore, the pH in the intermembrane space of mitochondria should be lower compared to the matrix due to the higher concentration of protons in the intermembrane space.

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In the pictured cell, the side containing zinc is the anode and the side containing copper is the cathode. The purpose of the Na2SO4 is to facilitate the transfer of electrons from the anode to the cathode.

A cell is a unit of life that is the smallest and most simple living organism, it can be classified as a complete organism, with all of the components that make up a living being, including DNA, membranes, and organelles. A voltaic cell is a device that converts chemical energy into electrical energy, it is also known as a galvanic cell or a Daniell cell. It is made up of two different metals that are submerged in an electrolyte solution that enables the transfer of electrons from one electrode to the other. The anode is the electrode that oxidizes and loses electrons during a redox reaction, this electrode is negatively charged, as it is the site of the oxidation reaction that releases electrons and generates an electrical current.

A cathode is an electrode that is reduced and gains electrons in a redox reaction, this electrode is positively charged and acts as a sink for electrons, absorbing them and using them to create a reduction reaction that generates an electrical current. The Na2SO4 in the pictured cell is an electrolyte solution that facilitates the transfer of electrons from the anode to the cathode. The salt dissociates into Na+ and SO42- ions, which then migrate toward the anode and cathode, respectively, where they can participate in redox reactions that generate an electrical current. This flow of ions helps to maintain a balance of charge in the cell and enables the transfer of electrons to occur more efficiently.

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The type of inhibition for each enzyme in the presence of its inhibitor is as follows:

What is enzyme inhibition?

Inhibitors that do not contribute to the development of the product carry out the inhibition. The inhibitors can impact both the substrate and the enzyme. The stoppage of enzyme activity is referred to as enzyme inhibition.

To determine the type of inhibition for each enzyme in the presence of its inhibitor, we can compare the kinetics data for the enzyme alone and in the presence of the inhibitor. Specifically, we can compare the changes in KM and Vmax values.

Therefore, the type of inhibition for each enzyme in the presence of its inhibitor is as follows:

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To calculate the equilibrium constant for a reaction with heat absorbed, determine equilibrium concentrations and use the law of mass action.

At the concentration equilibrium constant for a certain reaction, heat is absorbed if the reaction is run at constant pressure. Some of the reactants are liquids and solids, and the net change in moles of gases is .

To calculate the equilibrium constant, we need to first determine the equilibrium concentrations of each species. We can do this by using the mass and moles of the reactants and products, the stoichiometric coefficients, and the net change in moles of gases.

Once we have the equilibrium concentrations, we can calculate the equilibrium constant using the law of mass action:

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There are approximately 4.5 x 10^23 atoms in 0.75 mol of H2O.

Or 4,500,000,000,000,000,000,000.

The following are the rules for recognizing and naming binary molecular compounds from their chemical formulas:
1. The first element in the chemical formula will be the name of the first element in the compound.
2. The second element in the chemical formula will be the name of the second element in the compound.
3. If the first element is a metal, the second element will end in “-ide”.
4. If the first element is a nonmetal, the second element will end in “-ate” or “-ite”.
5. The prefixes “mono-, di-, tri-, tetra-, penta-, and hexa-” are used to indicate the number of atoms of each element in the compound.
6. When the prefixes are not used, the number of atoms of each element is implied by the subscript.
7. If the subscript is written as a fraction, the fraction is changed to a whole number when forming the compound name.

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The rules for recognizing and naming binary molecular compounds are written focusing on the lower groups and the higher groups.

The rules for recognizing and naming binary molecular compounds from their chemical formulas are as follows:

1. The element with the lower group number is written first in the formula, and its full name is used.

2. The element with the higher group number is written second in the formula, and its stem name is used along with the suffix -ide.

3. The prefixes mono-, di-, tri-, tetra-, penta-, and so on are used to indicate the number of atoms present for each element in the molecule.

4. The prefix mono- is omitted for the first element in the formula.

5. The ending -a or -o in the prefix is omitted if the element name begins with a vowel, and only the vowel of the prefix is used in the compound name.

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The organelle that breaks down chemicals in the cell is the lysosome.

Lysosomes are membrane-bound organelles that contain digestive enzymes that are responsible for breaking down various biomolecules, such as proteins, nucleic acids, carbohydrates, and lipids, into their constituent building blocks. These enzymes are able to break down these molecules through hydrolysis, where water is used to break the chemical bonds. Lysosomes play a crucial role in maintaining cellular homeostasis by removing unwanted or damaged cellular components, recycling macromolecules, and its defending against invading microorganisms. Dysfunction of lysosomes can lead to a variety of diseases known as lysosomal storage disorders.

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It is difficult to answer this question without more information about the 4 compounds mentioned. However, based on the statement given, if a compound has a smaller HOMO-LUMO energy gap, it means that it requires less energy to excite an electron from the HOMO to the LUMO orbital.

As a result, such a compound would absorb light of a longer wavelength compared to compounds with larger HOMO-LUMO energy gaps, which require more energy to promote an electron.

Therefore, if compound "v" has the smallest HOMO-LUMO energy gap among the 4 compounds mentioned, it is likely that it would absorb light of a longer wavelength compared to the other compounds.

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As per the information provided in the question, the compound that is the limiting reagent is "B". And the starting materials were "more polar" than the reaction product.

The limiting reagent is the one that gets consumed completely in the reaction. The other reactant is left behind in excess. The reaction's speed is determined by the amount of the limiting reagent present. In the given reaction, compound B is the limiting reagent. We can prove this by comparing the number of moles of compounds A and B. We can see that compound B has fewer moles. Therefore, it is the limiting reagent. 2 moles of compound A react with 1 mole of compound B. We have 2 moles of A and 1 mole of B in this reaction mixture. Hence, compound B is the limiting reagent. Starting materials are more polar than the reaction product. When a chemical reaction occurs, the reactants combine to form a new compound or product. The product's properties are often different from those of the starting materials. In this reaction, the starting materials are more polar than the reaction product. This can be seen by observing the reaction mixture's lane. We can see that the reaction product has moved ahead of the starting materials on the chromatogram. The starting materials are more polar than the reaction product.

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The approximate percent by mass of oxygen in SO3 is 19.98 % which is calculated by using the percent composition formula.

The sulfur trioxide is defined as the chemical compound with molecular formula or chemical formula SO3. In every sample of substance there will be the same number of sulfur atoms and oxygen atoms present in the substance.

The percent composition can be calculated by dividing the mass of the atom by the total mass of the compound or the molecular weight multiplied by 100.

It can be calculated as, C% =MA / MT×100

We know that the atomic weight of Sulphur is 32.059 g/mole and the atomic weight of oxygen is 16.0.

The total mass becomes,  32.059 + 3×16=80.059

.C% = 16.00 / 80.059 ×100

⇒C% =19.98 %

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The correct question is,

What is the approximate percent by mass of oxygen in SO3?

Each of the functions in column A will be performed by their respective hormones. Each of the hormones in the human body has a different function.

A hormone is a chemical substance that is produced by a gland or a group of cells and is transported by the bloodstream to target cells or organs in the body. They are produced by endocrine glands.

To answer your question:

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Codominance is a type of inheritance pattern in which both alleles of a gene are expressed equally in the phenotype of the individual. This means that if a baby inherits two different alleles for a particular trait, both will be expressed in the baby's physical appearance.

In the case of the missing identification bracelets, the nurse could use the principle of codominance to help identify the babies and return them to their correct parents. For example, if one baby has a parent with blood type A and the other has a parent with blood type B, and both babies have blood type AB due to codominance, then the nurse could match the babies with their correct parents based on their blood type.

Similarly, if there are other observable traits that exhibit codominance, such as eye color or skin tone, the nurse could use these to help identify the babies and return them to their correct parents. By understanding and applying the principles of codominance inheritance, the nurse could help ensure that each baby is reunited with their rightful family.

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The reaction demonstrates that energy is needed to dissociate the hydrogen atoms from one another, and as a result energy is consumed.

When a chemical bond is broken, energy is required to break the bond, and thus energy is absorbed. The equation that represents energy being absorbed as a bond is broken is option D, which is:

H2 + energy → 2H

In this equation, the energy is shown as a reactant on the left-hand side of the arrow, indicating that it is required for the reaction to proceed. The H2 molecule on the left-hand side represents a molecule with a covalent bond between two hydrogen atoms. When energy is added to the molecule, the bond between the two hydrogen atoms is broken, and the atoms become separated. This results in the formation of two hydrogen atoms on the right-hand side of the arrow, each with one unpaired electron.

Overall, the reaction shows that energy is required to break the bond between the hydrogen atoms, and thus energy is absorbed during the process.

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Gamma radiation are the most dangerous type of radioactive emission as they are the most energetic and can penetrate the human body and damage cells. Alpha particles can cause both short-term and long-term health effects, such as cancer.

Out of alpha, beta and gamma radiation, the most dangerous type of radioactive emission is gamma radiation. This is because gamma rays are penetrating, high-energy rays that can easily penetrate the human body and cause damage to cells and DNA. Gamma radiation, unlike alpha and beta radiation, can penetrate the body's skin and tissue, exposing internal organs to radiation. When gamma rays are absorbed by living cells, they can ionize atoms and molecules, causing damage to DNA and other genetic material in the cell. High doses of gamma radiation can cause immediate symptoms such as radiation sickness and even death. Gamma radiation is frequently emitted by unstable radioactive atoms like uranium and plutonium, which are used in nuclear power plants and nuclear weapons. Workers in these industries and anyone exposed to a nuclear accident or bomb are at a higher risk of exposure to gamma radiation. Alpha radiation is a type of ionizing radiation that is emitted by certain types of unstable atoms. Alpha particles are relatively large and have a short range, so they can be stopped by a sheet of paper or the outer layer of human skin. Beta radiation is a type of ionizing radiation that is emitted by certain types of unstable atoms. Beta particles are much smaller than alpha particles, and they can travel through the human body farther than alpha particles. Gamma radiation is a type of electromagnetic radiation, similar to X-rays, but with higher energy and frequency. Gamma rays are produced by the decay of unstable atomic nuclei and are highly penetrating, meaning they can easily pass through solid objects.

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Phosphorus pentachloride decomposes to phosphorus trichloride and chlorine gas at elevated temperatures by the following reaction:

PCl5(g) PCl3(g) + Cl2(g).

If Kc = 1.8 at 250°C, the value of Kp at the same temperature is given as follows. The correct option is 65. (Option D)

Kc = {PCl3 * Cl2} / {PCl5}

At equilibrium;Kp = {PCl3} * {Cl2} / {PCl5}

Since the stoichiometry of the given chemical equation is 1:1:1, Kp = Kc. Kp = 1.8 at 250°C. Therefore the answer is 65

.According to the above data, the calculation of the value of Kp at the same temperature is as follows;

Kc = {PCl3 * Cl2} / {PCl5}1.8 = {PCl3 * Cl2} / {PCl5} (At 250°C)

Kp = {PCl3} * {Cl2} / {PCl5} (At 250°C)

Kp = KcKp = 1.8

Therefore, the correct answer is option D, which is 65.

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Answer:

large atomic size and low ionization energy.

Explanation:

Metallic behavior correlates with large atomic size and low ionization energy. Thus, metallic behavior increases down a group and decreases from left to right across a period. Elements in Groups 1A(1) and 2A(2) are strong reducing agents; nonmetals in Groups 6A(16) and 7A(17) are strong oxidizing agents.

Dmitri Mendeleev was the Russian scientist who first arranged the elements in the periodic table. He arranged elements in the periodic table by their atomic mass, and he also made sure that elements with similar properties were placed in the same group.

The periodic table is a tabular representation of the chemical elements, which are arranged by atomic number, electron configuration, and chemical properties. The rows of the periodic table are known as periods, and the columns are known as groups or families. Elements in the same group have similar chemical and physical properties.

Mendeleev's contributions to the periodic table

Mendeleev was a Russian chemist who published the first widely recognized periodic table in 1869. In the periodic table, Mendeleev arranged the elements according to their atomic mass. He also left gaps in the periodic table for unknown elements, and he predicted their properties based on the properties of the known elements.

For example, he predicted the properties of germanium, which was discovered later, and he even named it. He was also able to predict the existence and properties of some of the noble gases.

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Uranium 238 occurs naturally in bedrock and leads to the formation of radon. So. option (a) is correct.

Uranium-238 is said to be the most common isotope of uranium found in nature having a relative abundance of 99%. Uranium-238 is non-fissile that means it cannot sustain a chain reaction in a thermal-neutron reactor. Depleted uranium that is uranium containing mostly U-238 can be used for radiation shielding or as projectiles in armor-piercing weapons. Uranium-238 occurs naturally in nearly all rock, soil, and water. Uranium-238 is the most abundant form in the environment. Radon is said to be an odorless, invisible, radioactive gas naturally released from rocks, soil, and water. It can get into homes and buildings through small cracks or holes and build up in the air.

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Complete question is,

Occurs naturally in bedrock and leads to the formation of radon.

a. Uranium-238

b. coal

c. natural Gas

d. Oil

e. Solar