Which of the following is the disadvantage(s) of hydrogen? a) Inflammability b) Leaking c) Explosive limit d) All of the mentioned.

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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Answer:

moving around

Explanation:

The answer is essentially:

No. Life would be no different if electrons were positively charged and protons were negatively charged. Opposite charges would still attract, and like charges would still repel.

Miller -Urey experiments was an investigation for the components that made life on earth. The experiment used water, methane gas, ammonia and hydrogen gas. These compounds were cooled settled on the trap where they formed macromolecules latter called amino acids.

The Miller-Urey experiment was carried out to gather data pertaining to the topic of how life first developed on Earth. The experiment used a device with a number of flasks and tubes that pumped materials that were said to be part of the initial or early atmosphere of Earth.

The methane, ammonia, and hydrogen gases were all added to a glass flask that held 5 liters and was connected in two directions to a system of tubes that also held a 500 milliliter flask that contained some water In this flask, electrodes produced electrical sparks to a mixture of gases and water vapor in order to mimic the lighting in the Earth's early atmosphere.

The cooling process results in a mixture of hydrogen, ammonia, methane, and water vapor. All the components finally settled into the trap at the bottom of the system and they are found to form macromolecules.

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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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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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First-order kinetics governs how the sample's original mass of 25.0 g decays nuclearly.

An unstable alpha particle emits subatomic particles on its own through a variety of processes known as radioactive decay. The parent nucleus is said to decay, resulting in the daughter nucleus.

When there is a reduced nuclear configuration to which an atom can transition, the atom radioactively decays. An atom's true decay event takes place at random and is not brought on by aging or other changes over time.

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A constant current is passed through an electrolytic cell containing molten MgCl₂ for 12.8 h. if 3.64 g of mg(s) is produced .The  magnitude of the current that was passed through the cell is

given that :

T = 12.8 hr = 46080 sec

Mass = 3.64 g

molar mass = 24.305 g /mol

the moles = mass / molar mass

                 = 3.64 / 24.305

                 = 0.149 mol

moles = Q / ZF

where,

Q = charge

Z = no. of electrons

F = faraday constant = 96485 C

moles = Q / ZF

Q = 0.149 × 2 × 96485

Q = 28752.53 C

the current is given as :

Q = I T

I = Q / T

I = 28752.53 / 46080

I = 0.62 A

Thus, the current is 0.62 A.

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

Explanation:

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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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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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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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)

Answer:

Heat capacity depends upon the mass of the substance, hence it an extensive property

(. ❛ ᴗ ❛.)

These procedures are all delta S< 0. When isopropyl alcohol cools, it condenses and releases carbon dioxide, carbon dioxide ions, and water.

Isopropanol, often known as isopropanol, is a colorless, transparent solvent that is a key ingredient in alcohol along with common household products like hand sanitizers, cleansers, and disinfectants. It is also a common ingredient in medications. Rubbing alcohol has various possible uses for human care and home cleaning. These applications include deodorizing and cleansing bites and piercings.

production procedures. It's been said that isopropyl alcohol was the first chemical (IARC, 1992). Three alternative processes can be used to make it: catalytic hydrogenation of acetone, indirect hydration of methanol, and direct hydration of propylene.

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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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C. 0.1 M barium chloride following would produce maximum elevation in boiling point

Because both the hydroxyl and carboxylic acid groups might take part in intermolecular hydrogen bonding, compound IV would have the greatest boiling point. Additionally, compound IV exhibits stronger dipole-dipole attraction due to its increased polarity (more polarized carbon-oxygen bonds).

The element with the lowest temperature at which an element would smolder is helium, while the element with the highest temperature is tungsten. The melting point is measured in degrees Celsius (C).

The most particles will be produced by BaCl2 after dissociation. Consequently, it causes the greatest rise of boiling point.

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The option (d) is correct DNA polymerase enzyme are nucleotides the substrate.

We refer to a substance as a substrate when another substance is added to it. It is defined differently in several sciences. In the field of material sciences, the term "substrate" is widely used to describe the base material on which various processing operations are carried out with predetermined reaction parameters to produce additional layers and films, such as coatings. As a result, there are numerous definitions available in the literature, depending on the substrate's applications and area of study. A substrate is a molecule that an enzyme interacts with. The enzyme's active site, where potential weak connections between molecules can form, is filled with a substrate. The targeted reaction results in the formation of an enzyme substrate complex as the substrate reacts under the pressure of the enzyme. The conformational shift, or shape change, of the enzyme is caused by the bonds that develop between the substrate and the enzyme.

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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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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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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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Option C) provides a useful definition of chemistry.

The science that strives to comprehend how molecules interact in order to improve human control over nature is a solid way to define chemistry. the branch of science that examines how molecules interact with atoms to provide insight into the workings of the cosmos.

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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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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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CH3NH2 + HOH ==> CH3NH3^+ + OH^-Which molecule/ion accepts a proton. That is the base. Which molecule/ion donates a proton. That is the acid.

A stable subatomic particle known by the symbol for "proton"

e elementary charge, p, H+, or 1H+ having a positive electric charge. Its mass is 1,836 times greater than an electron's mass and just a little bit less than that of a neutron (the proton–electron mass ratio). "Nucleons" refers to protons and neutrons together, each of which has a mass of roughly one atomic mass unit (particles present in atomic nuclei).

Each atom. has a nucleus. that contains one or more protons. In order to keep the atomic electrons bound, they offer the central attractive electrostatic force. An element's defining characteristic, known as the atomic number, is the number of protons in the nucleus (represented by the symbol Z)

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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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Surface tension is amount of energy required to increase surface area of liquid, surface tension is the result of a net downward and inward force and polar liquid will have a higher surface tension than nonpolar liquid.

The tendency of liquid surface at rest to shrink into the minimum surface area is called as surface tension. It allows objects with a higher density than water such as razor blades and insects to float on water surface without becoming submerged.

Besides mercury, water has the highest surface tension for all liquids, which is due to the hydrogen bond in water molecules.

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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 solution of the base would have a pOH of  3.66 when titrated.

We know that pOH can be obtained from the concentration of the base and we can be able to work out the pOH when we attempt to apply the Henderson–Hasselbalch equation to a basic solution.

Number of moles of the salt = 10/1000 * 0.2 M

= 0.002 moles

Number of moles of the acid = 10/1000 L * 0.1 M

= 0.001 moles

Total volume = 10 mL + 10 mL = 20 mL or 0.02 L

Molarity of the salt =  0.002 moles/0.02 L

= 0.1 M

Molarity of the acid =  0.001 moles/0.02 L

= 0.05 M

Then;

pOH = pKb + log (salt/base)

pOH = 3.36 + log( 0.1 M/0.05 M)

pOH = 3.66

The pOH of the system is  3.66

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