Which of the following is CORRECT when considering the tertiary structure of globular proteins?

Which of the following is CORRECT when considering the tertiary structure of globular proteins?

Hydrophobic residues are normally on the inside and hydrophilic residues are on the outside.
The amino acid proline never occurs in a region where the polypeptide chain bends or turns.
All parts of the proteins can be classified as helix, β sheet or turns.
β sheets cannot be twisted or wrapped into barrel structures.
None of the above.

One of the stereoisomers of the following oblongolide structure. There are 4  stereoisomers structures exist for this structure.

A stereoisomer is a molecule that has the same molecular formula and the same connectivity of atoms, but the atoms are arranged in a different spatial configuration. There are two main types of stereoisomers: geometric isomers and optical isomers. Geometric isomers are stereoisomers that differ in the spatial arrangement of atoms within a molecule. They can be cis-trans isomers, which differ in the orientation of substituents on a double bond, or E-Z isomers, which differ in the orientation of substituents around a triple bond. Optical isomers, also known as enantiomers, are stereoisomers that are non-superimposable mirror images of each other. They differ in the orientation of chiral centers (atoms with four different substituents) within a molecule. In the oblongolide structure, there are two chiral centers, one at the carbon atom bonded to the oxygen atom and one at the carbon atom bonded to the nitrogen atom. This means that there are two possible configurations for each of these chiral centers, resulting in a total of 2 x 2 = 4 stereoisomers. Therefore, there are four stereoisomers of the oblongolide structure: two geometric isomers and two optical isomers.

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Answer:

C. CCl4

Explanation:

Covalent bonding involves the sharing of electrons between two or more atoms (mostly non-metals)

The other 3 are ionic bonds (metal and non-metal)

Does Not Paper Rubber Tire Conducts Electricity Electricity should be applied to metal objects like an iron nail and a coin.

Metals are substances that efficiently transfer heat and electric current. They often resemble copper wire in that they are bright and malleable. In the periodic chart, metals make up the majority of the elements.

Conductivity is a generic term that describes a substance's ability to carry heat or electricity. Because a conductor presents little to no resistance to the flow of electrons, which results in an electrical current, a conductor carries electricity.

Silver, copper, and aluminium are the most common materials, in that order. Despite being the finest electrical conductor known to man, silver is not frequently used due to its high cost. Only unique apparatus, such as satellites, are employed with it. Despite not being as high as silver, copper has a strong conductivity.

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Ions present in the Cr₂O₃ compound are Cr⁺³ and O⁻².

Ions present in the PbCl₄ compound are Pb⁺⁴ and Cl⁻.

Ions present in Na₃PO₄ compound are Na⁺ and PO₄⁻³.

Ions present in Al(ClO₄)₃ compound are Al⁺³ and ClO₄⁻.

Ions present in SrSO₄ compound are Sr⁺² and SO₄⁻².

The name of the H₂SO₄ compound is sulfuric acid.

The name of the Cr₂S₃ compound is chromium(III) sulfide.

The name of the CCl₄ compound is carbon tetrachloride.

Ionization reactions can explain which ions make up an ionic compound between metal and non-metal. Look at the attachment for a complete question. The ionization reactions for compounds

Covalent compounds are composed of non-metallic elements and non-metallic elements. Naming covalent compounds using prefixes. But if only one atom is in the first part, we didn't have to use a prefix.

CCl₄ is a covalent compound

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Answer: renewable sources are better for the planet.

Explanation:

renewable sources are better for the planet, because we can use them repeatedly and can be replenished. However, non-renewable is the opposite of renewable sources (fossil fuel)

Atoms of group 18 elements have eight valence electrons while group 1 has one valence electron (or two in the case of helium). These substances are extremely stable since they already have a full exterior energy level.

Group 18 members possess eight valence electrons, or eight electrons in their outermost orbit (except helium). They display a steady octet arrangement as a result.

Because the extra valence electrons can be quickly removed to produce a positive ion, an atom with one or two more valence electrons than a closed shell is extremely reactive.

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Net Ionic equation is

C6H15O3N (aq) + H2O (l)  ---------------> C6H15O3NH+ (aq)   +  OH- (aq)

What is Ionic equation?

A large number of the single-replacement and double-replacement reactions involved ionic compounds, such as those involving metals and nonmetals or those containing identifiable polyatomic ions. Now let's examine more closely at ionic compound-containing processes.

Ionic compounds differ from molecular compounds in a number of significant ways, one of which has to do with how easily they dissolve in a liquid like water. The molecules drift apart from one another as molecular substances, like sugar, disintegrate in water. Ions in ionic compounds physically separate from one another when they dissolve. To illustrate this process, we can use a chemical equation. For instance, using NaCl

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If 6 mol of hydrogen gas completely reacts with phosphorus at 298 k, the final pressure in a 5.0 l reaction vessel is 20 atm. When a reaction occurs, P4(s) + 6H2(g)  => 4PH3 (g).

The force perpendicularly applied to an object's surface divided by the area over which it is dispersed is known as pressure. The gauge pressure, also known as gauge pressure, is the pressure in relation to the surrounding air pressure. To express pressure, a variety of units are employed. The chemical element phosphorus has the atomic number 15 and the letter P in its name. Phosphorus is an element that exists in two main forms, red and white phosphorus, but is never found on Earth as a free element due to its strong reactivity.

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Answer: Polar molecules have a better force holding on a surface than non polar.

Explanation:

Answer: D

Explanation:

Water is comprised of 2 Hydrogen atoms and 1 Oxygen atom. This gives us a total of 8 valence electrons to form bonds with.

Because Hydrogen is in first row of elements it can only hold a total of two electrons. This means each Hydrogen holds 2 electrons.

But that means there are four more electrons. VSEPR theory is basically how electron repulsion causes atoms to arrange in different ways.

There will be four electrons left on the oxygen because they can not go anywhere else. This will cause the hydrogen molecules to move away from the lone electrons and cause a bent geometry rather than a straight-line geometry.

The radius of the chlorine atom increases when it gains an electron. when a chlorine atom transforms into a chloride ion

Who or what is an electron?

A effectively integrate particle with such an opposite electrical charge is called an electron. In contrast to neutrons and protons electrons are not made up of even smaller building blocks. Each electron has an extremely low mass compared to a neutron or proton and carries one units of negatively charged (1.602 x 10-19 coulomb).

What functions do electrons serve?

Java, HTML, and CSS can all be used to create application software that use the Electron framework. Electron enables you to preserve an unified JavaScript codebase and develop pass applications that run on Windows, OSX, and Linux by incorporating Chromium and Node. js into its binaries.

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When 1,3-cyclopentadiene, symmetric conjugated diene, is reacted with HCL then, it produces an allylic carbocation whose contributing resonance structures are equivalent, resulting in a single product.

Cyclopentadiene is an organic compound having the formula C₅H₆. It is  abbreviated as CpH because the cyclopentadienyl anion is abbreviated Cp⁻.

This is colorless liquid and has a strong and unpleasant odor. At room temperature, cyclic diene dimerizes over the course of hours to give dicyclopentadiene. Dimer can be restored by heating to give monomer.

This compound is used mainly for the production of cyclopentene and its derivatives. It is popularly used as a precursor to the cyclopentadienyl anion (Cp−), which is an important ligand in cyclopentadienyl complexes in organometallic chemistry.

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Typically, a molecular molecule consists of two or more nonmetal components. The name of the second element is listed after the stem of the name of the first element, followed by the suffix -ide.

Nitric oxide (NO), commonly known as nitrogen monoxide, is a colorless, poisonous gas created when nitrogen is oxidized. Nitric oxide has a number of uses in medicine and plays a significant role in chemical signaling in both humans and other animals. There aren't many industrial uses for it.

Nitrous oxide (N2O) is known as "laughing gas" because it makes people feel good after inhaling it. It tastes and smells slightly sweet. J. Priestley created N2O for the first time.

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The physical change occurring here is the flattening of Al into foils. The coefficient of LiOH in the reaction is 2. F replaces oxygen because it is highly electronegative. Metals does not combine with each other since all metals forms positive ions and positive ions repels each other.

A physical change involves change in shape, size or state but does not involve the formation or breaking of any chemical bonds. The Al sheets flattening into foil is a physical change whereas all other given reaction are forming new products are chemical changes.

Reaction of 2 moles Li with water forms 2 moles of LiOH. Thus, coefficient of LiOH is 2.

Lithium oxide reacts with halogens giving lithium halides. Fluorine is more electronegative than oxygen and fluorine gains one electron to from Li forming LiF.

In displacement reactions of metals, one metal displaces the other metal from the compound. For example, from metal halides, the halide group is displaced into the second metal. Here, metals does not combine each other because metals form positive ions and and two positive ions will repel.

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Magnetic, electric, and gravitational fields are a few examples of the forces that pull you toward the center of the earth.

Every mass of stuff has an area surrounding it where other bodies may feel its gravitational pull.A gravitational field is the name given to this area of space.The gravitational field has direction, just like other electromagnetic fields like the electric and magnetic fields.It's a vector field as a result.

field is a zone in physics where each point is connected to a physical quantity.The quantity could be a vector, such as in the case for fields like the gravitational field, that are linked to a force, or it could be a number, such as in the case of scalar fields like the Higgs field.

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The products of a. methyl benzonitrile, b. 2,4,6 tribromophenol, c. ethyl benzoic acid and d. 1,2 dimethyl benzene as a major product.

The reaction between benzonitrile with methyl chloride and aluminum trichloride yields methyl benzonitrile.

The reaction between phenol and bromine yields 2,4,6 tribromophenol.

The reaction between benzoic acid and chloroethane and aluminum trichloride yields ethyl benzoic acid.

The reaction between benzene, methyl chloride and aluminum trichloride yields 1,2 dimethyl benzene as a major product and 1,3 dimethyl benzene as a minor product.

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pH is a measure of the hydrogen ion concentration of the water as ranked on a scale of 1 to 14. The lower the pH of water, the more acidic it is. The higher the pH of water, the more basic, or alkaline, it is. Lemon juice has an acidic and sour flavor. Lemon juice is acidic, applying anything acidic to your eyes will cause them to sting and hurt.

People describe a soapy taste as bitter, slightly metallic, and burning. A great variety of soaps contain a pH range of 9-10 as they are mostly alkaline. Your eyes have a low tolerance for alkaline substances. Thus, when soap gets into them, the pH difference results in a burning sensation. A pH paper is a piece of paper used to find out if a solution is basic, acidic, or neutral. A pH paper changes color in different solutions due to the chemical flavin.

Ammonia is a weak base because its nitrogen atom has an electron pair that readily accepts a proton. Also, when dissolved in water, ammonia acquires hydrogen ions from water to produce hydroxide and ammonium ions. It is the production of these hydroxide ions that imparts ammonia its characteristic basicity.

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When a  substance has molar mass of 60g/mol with 40 percent carbon, 6.7 percent hydrogen and 53.3 percent oxygen, the empirical formula is CH₂O.

given,

molar mass of the substance= 60 g/mol

percentage of C= 40%

percentage of H= 6.7%

percentage of O= 53.3%

we know that,

molar mass of C= 12g/mol

molar mass of H = 1g/mol

molar mass of O= 16g/mol

The ratio of C,H and O is

[tex]\frac{40g}{12g/mol} C : \frac{6.7g}{1g/mol} H : \frac{53.5g}{16g/mol} O[/tex]

After dividing each, we get the ratio

C:H:O = 3.33 : 6.65 : 3.34

Now, we will divide each elemental ratio by the lowest whole number i.e 3.33 to get the simplest whole number ratio.

C = 3.33/3.33 =1

H = 6.65/3.33 = 1.99≈ 2

O = 3.34/3.33 =1

therefore, the required  simplest whole number ratio is C:H:O = 1:2:1

Thus, the empirical formula is CH₂O.

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When, where, and how much a gene is expressed in a cell depends on the histones and epigenetic elements working together.

In eukaryotic cells, there are proteins called histones that serve two purposes. They support the maintenance of DNA in a compact state and control the loosening the tightening of DNA strands, which controls the expression of genes.

Epigenetic factors are substances that alter the gene to control how a gene expresses itself. Both of these modifications are not heritable and do not result in mutations. These are transient alterations such DNA remodeling, methylation, and alkylation, among others.

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CoN is the chemical symbol for cobalt(III) nitride. It has a 72.94 molecular mass.

Cobalt(III) Nitride is created when Nitrogen, which has a -3 charge, combines with cobalt(III), which is in the +3 oxidation state. A CoIIINCoIII canonical form with considerable -bonding between the cobalt centres and the nitride atom is supported by density functional theory. airbags for automobiles, catalysts for the chemical and petroleum industries, diamond tools, cemented carbides (also known as hardmetals), corrosion- and wear-resistant alloys, paints, varnishes, and inks, drying agents for dyes and pigments, ground coats for porcelain enamels, and high-speed all use cobalt. It is an element that only very infrequently occurs in meteorites and the core of the earth. Many minerals contain cobalt, however it typically only appears in trace levels.

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Yes, the statement is true, undiluted side-stream smoke contains higher concentrations of toxic compounds than mainstream smoke.

The fatal potential of substances like lead, formaldehyde, asbestos, and arsenic is widely known. However, understand the specific health effects of exposure or the threshold at which they become toxic. What about the toxic substances we learned about in the news, like mercury in canned tuna, BPA in plastic, and cadmium in jewelry. The Toxic Compounds Portal offers a search engine that enables users to find chemicals by name, CAS number (Chemical Abstract Service registration number), synonym, or trade name. Users have access to additional substance search techniques. Substances that could have an adverse effect on organ systems' health (e.g., cardiovascular or respiratory systems) The chemical class includes metals, pesticides, and volatile organic substances. Individuals in the area looking for precise information on pollutants and how they affect health professionals in toxicology and public health looking for information on toxicity and associated health risk level experts who respond to cases of severe chemical exposure, such as emergency room physicians.

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The Lewis structure is attached below:

Lewis  structures also called electron dot structures, or Lewis electron dot structures, are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.

The Lewis rule states that Hydrogen atoms form only single bonds and they are always at the ends of a sequence of atoms. Hydrogen often is bonded to carbon, nitrogen or oxygen. Oxygen atoms usually do not bond to each other, except for O2, O3, superoxides and peroxides.

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The bond angle formed by an equatorial atom is 90 degrees and the axial atom is 180 degrees.

Bipyramidal alludes to two pyramids, Above and underneath the center particle are the axial atoms and These are the "pyramid points" that the molecule forms. The pyramids ought to be visible in connection to the bottom and top parts of the central atom. The particles that are found within the horizontal plane of the Centre atom are known as equatorial atoms. The axial and equatorial atoms  bond angles are 90 degrees.The equatorial atoms have 120-degree binding angles with one another.

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The methods that will help to correctly identify the PH with indicator paper are:

Correct answer: letter A, C and D.

This is because these methods provide an organized approach to testing the pH of a solution. In addition, using a transfer pipette to draw a few drops of the solution and dropping them onto the paper will ensure that the correct amount of solution is tested. Waiting a minute or so before reading the color will also allow the indicator paper to change color and provide an accurate reading.

Is a measure of its acidity. It is measured on a scale from 0 to 14, with 0 being the most acidic, 7 being neutral and 14 being the most basic. The pH is determined using an acid-base indicator, such as pH paper.

Liquids in a solution can be made more acidic or more basic by adding acids or bases. Increasing the acidity decreases the pH, while increasing the basicity increases the pH.

Which methods will help you properly identify pH with indicator paper? Check all that apply:

A) Set a piece of pH paper in front of each solution before testing to keep organized.

B) Dip the pH paper into each test tube and lay it on the table to let it change color.

C) Use a transfer pipet to remove a few drops from the solution to drop onto the paper.

D) Wait a minute or so before reading color. Use the same piece of indicator paper for each solution to conserve paper.

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Net charge on the amino acid glycine at pH 7 is Zero (0) and at pH 12 is minus one (-1).

Chemistry uses a scale known as pH, which formerly stood for "potential of hydrogen" (or "power of hydrogen"), to express how acidic or basic an aqueous solution is, acidic solutions (solutions with higher H+ ion concentrations) have lower pH values than basic or alkaline solutions. The pH scale, which is logarithmic, exhibits an inverse relationship with the concentration of hydrogen ions in the solution. The pH neutrality relies on temperature, falling below 7 if the temperature rises above 25 °C. For very concentrated strong acids, the pH value can be less than 0; for very concentrated strong bases, it can be higher than 14. The set of standard solutions whose pH has been defined by international agreement can be used to trace the pH scale. Using a concentration cell with transference, the potential difference between a hydrogen electrode and a standard electrode, such as the silver chloride electrode, is measured to get the primary pH standard values. With the use of a glass electrode, a pH meter, or a color-changing indicator, the pH of aqueous solutions can be determined. Chemistry, agronomy, medicine, and water filtration all depend on pH measurements.

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The carboxylic acid required to create the ester with a grape scent is heptanoic acid.

Numerous carboxylic acids are odorless liquids with color. All of the carboxylic acids with five to ten carbon atoms smell "goaty" (explaining the odor of Limburger cheese).

Because of their weak intermolecular interactions, esters have a distinctive smell. This stimulates ester molecules to enter the gas phase and hit the nose. Esters float on water because they are not soluble in water, which makes it simple for them to mix in the gas phase. They therefore smell more potent in water.

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Two chlorine atoms that are not metals make up the compound Cl2. Cl2 won't display metallic boding as a result. Cl2 won't include an ionic link since ionic bonds only form when a metal and a non-metal interact, thus it must be covalent.

Answer and justification K and F both have electronegativities of 0.8 and 4.0, respectively. Therefore, (4.0-0.8) or 3.2 is the magnitude of the electronegativity difference between K and F. K-F bonds are hence ionic in nature. In most cases, ionic compounds are created between metal and nonmetal components. For instance, the ionic compound calcium chloride is made up of the metal calcium (Ca) and the nonmetal chlorine (Cl) (CaCl2). Covalent bonds like NH3 exist. This is due to the electron being shared by nitrogen and hydrogen.

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Option (d) is correct, i.e. tri-boric acid is the following acid: HBO3 if (BO3)^-3 is called the borate ion.

Various borate ion [B2O5]4s, [B3O8]7s, [B4O12]12s, [B5O6(O)5]2s, [B6O13]8s, etc. are made up of trigonal planar B(O)3 or tetrahedral [B(O)4] structural units that are connected by shared oxygen atoms (corners) or atom pairs (edges) into bigger clusters. These anions can further polymerize into endless chains, layers, and frameworks and may have cyclic or linear structures. The terminal (unshared) O atoms in the anions can either carry a negative charge (O) or be capped with hydrogen atoms (OH). In order to have -conjugated molecular orbitals, the planar B(O)3 units may be stacked in the crystal lattice, which frequently produces advantageous optical features as strong harmonic production, birefringence, and UV transmission. Each linear chain of 2, 3, or 4 trigonal BO3 structural units in a polymeric borate anion shares oxygen atoms with an adjacent unit (s), has chains of trigonal BO3 structural units, similar to LiBO2. Cycles are present in other anions; for instance, the cyclic [B3O6]2 ion is present in NaBO2 and KBO2.

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The Lewis structure for SeO3-2 is shown below:

 O

/ \

Se  O

\ /

 O

Using VSEPR theory, we can predict the geometry of the SeO3-2 ion to be trigonal planar.

To draw the Lewis structure for the SeO3-2 ion, we first need to determine the total number of valence electrons in the ion. The Se atom has 6 valence electrons and each O atom has 6 valence electrons, for a total of 24 valence electrons.

Next, we need to connect the atoms using single bonds. The Se atom forms three bonds with the O atoms, so we can place the O atoms at the corners of a triangle, with the Se atom at the center. This arrangement satisfies the octet rule for each atom, because each O atom has a full valence shell of eight electrons and the Se atom has an expanded valence shell of eight electrons as well.

Using VSEPR theory, we can predict the geometry of the SeO3-2 ion to be trigonal planar. In this geometry, the three O atoms are arranged in a plane around the central Se atom. The electronic structure of the ion can be described as follows: the central Se atom has a total of six valence electrons, and each of the three O atoms has a total of seven valence electrons. This results in a total of 25 valence electrons in the ion, giving it a -1 charge.

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