Which phenomenon that goes unexplained by lewis structures is solved by applying molecular orbital theory?

The STP equation is Pressure , P = 1 atm , Temperature , T = 273.15 K.

The ideal gas equation is given as :

P V = n R T

where,

P = pressure of the gas = 1 atm

V = volume of the gas

n = 1 mol

R = constant = 0.823 atm L / mol K

T = temperature = 273.15 K

V = n R T / P

V = (1 × 0.082 ×273.15 ) / 1

V = 22.4 L

thus, at STP , that is standard temperature and the pressure,  the volume is 22.4 L.

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Wooden products like plywood and table boards contain formaldehyde.

Formaldehyde is the first member of the aldehyde family of alkane.

It contains a double bond between the carbon and the oxygen atom and forming one single bond with each of the two hydrogen atoms.

Formaldehyde is a naturally occurring chemical which can be found in the wooden products like plywood and table boards that are used on the daily basis in our homes.

Apart from this, the Paints, cosmetics and some synthetic fibers also contains formaldehyde.

Formaldehyde is also a very crucial part of the formation of many polyesters.

So, it can also be found in polyester based products.

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A replacement reaction is one wherein a set of atoms is replaced by another atom in a molecule. In the given reactions is 2Na + Cl₂ → 2NaCl is not a replacement reaction.

A displacement reaction also known as a replacement reaction can be defined as one wherein an atom is displaced by another atom in a molecule. For example, when iron (Fe) is added to a solution of copper sulfate (CuSO₄), it displaces the copper (Cu) metal.

A single replacement reaction can be described as a kind of redox reaction when an element moves out of a compound, one element is replaced by the other in its own compound.

[tex]A +BC\longrightarrow AB +C[/tex]

Double replacement reactions take place mostly in aqueous solutions wherein the ions precipitate and the exchange of ions occurs. The double replacement reaction can be represented as:

[tex]AB +CD\longrightarrow AC +BD[/tex]

Therefore, option (D) is correct.

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Answer:

No

Explanation:

It is not a serious condition because people who have it don't face any life threatening, or even health threatening symptoms. The only bad symptoms that a person can have are diarrhea, gas, or bloating, which are all pretty uncomfortable, but aren't serious things.

-Hope this helped & Happy Holidays!

When 100 grams of water and 50 grammes of potassium chloride are dissolved at 50 C, the solution can be appropriately referred to as supersaturated. If more solute is added, supersaturated solutions result.

The saturated solution To put it another way, it is the situation in a saturated solution when you add some extra solute to the solution. The prepared solution will reach saturation when it crosses the line of saturation if it is cooled. It will be supersaturated if it is previously cooled, along the saturation line to point B. This solution is oversaturated, but that does not mean it will immediately crystallize. The term "metastable" refers to supersaturated solutions.

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The statement strengthens the argument for solar energy :

- The cost of solar energy continues to decline as production increases.

- Solar energy is abundant renewable resource and can be produced locally in remote areas.

- Solar energy has a high energy yield and can be used almost anywhere including rooftops.

Solar energy can be described as radiant light and heat from the Sun that is used by technologies such as solar power to generate electricity, solar thermal energy, and solar architecture. Solar energy is an essential source of renewable energy, and its technologies can be characterized as passive or active depending on how they capture and distribute solar energy.

In the given question the statement weakens the argument for solar energy Solar panels takes up a lot of space compared to other energy sources. The initial cost of the solar system is still relatively high.

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Basic amino acids are Arginine, Polar amino acids are Glutamine and non polar amino acids are Alanine.

Arginine is an essential amino acid that has a positively charged guanidine group. Arginine is well designed to bind the phosphate anion, and is often found in the active centers of proteins that bind phosphorylated substrates.  Glutamine is a polar amino acid. It thus most prefers to substitute for other polar residues, in particular Glutamate, which differs only in that it contains an oxygen in place of the amino group in Glutamine. It can also substitute with other polar amino acids. Alanine is an neutral non polar amino acid that is used to make proteins. It is used to break down tryptophan and vitamin B-6. It is a source of energy for muscles and the central nervous system. It strengthens the immune system and helps the body use sugars.

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According to the statement, this implies that the number of neutrons is equal to the number of protons. Correct answer: letter A.

This is because the N/Z ratio (Neutron/Proton ratio) is equal to 1.

Stable isotopes are atoms that have the same number of protons and neutrons in their nucleus. This means that the N/Z ratio of these atoms is 1, which implies that the number of neutrons is equal to the number of protons. Stable isotopes are essential for many scientific and technological applications such as research in:

Stable isotopes are typically found in elements with low atomic numbers. This is due to the fact that low atomic numbers indicate a low number of protons, which in turn implies fewer neutrons are needed to achieve the N/Z ratio of 1. This is why elements such as hydrogen, helium, and lithium are typically found to have more stable isotopes than other elements.

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Time taken to deposit 0.00235 moles of gold by the electrolysis of kaucl4(aq) using a current of 0.214 amperes is  53.0 min

Note that the oxidation number of gold is +3 in the aqueous solution given. We can then determine how many moles of e- are needed.

The most common oxidation states of gold are +1 and +3. This implies it gives either 1 or 3 electrons to form stable mixtures. For instance, in AuCl3 , chloride particles have a - 1 oxidation state so gold will have Au + 3(- 1) = 0, so gold will have a +3 oxidation state.

The oxidation number or oxidation state of any atom is the capacity of that atom to gain or lose electrons. The oxidation state is the charge on an atom when it is in its ionic form, or when in a molecule. The charge is negative when an atom tends to take electrons or the atom is more electronegative, while the charge is positive when an atom has a capacity to give electrons.

As the oxidation state is determined as particles, so the oxidation state of any neutral molecule is zero. So any molecule without a charge has a 0 oxidation number. Then by adding the individual oxidation numbers we can take out the oxidation number of any component to be positive or negative.

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The potential of a cell Eocell = Eored − Eooxid

Any electrochemical cell must have two half-cells in order to be functional. Without actually building the cell, the processes that will take place and the standard potential of a cell for any pair of two half-cells can be predicted using the table below. According to the table, reduction will take place inside the cell on the half-cell with the highest reduction potential. The cell will oxidise the half-cell with the smaller reduction potential. The entire cell potential will be a positive value if those conditions are met. For a cell to spontaneously undergo a redox reaction in the opposite direction, the cell potential must be positive.

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Answer:

A. color change

Explanation:

I'm 100% sure this is correct. Hope it helps! May I please have a brainliest for this? Thank you!

Answer:

the answer is A

Explanation:

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the energy of a photon that is emitted as a hydrogen atom makes a transition between the n is 13.6(n^2 - 1)/n^2 eV

From the hydrogen atom's first excited state to its ground state, an electron transitions.

the given part is

   n1 = 1  and   n2 = n

The energy of photon released,

E=13.6(1/n1^2 – 1/n2^2) eV

= 13.6(1/1^2 – 1/n^2) eV

= 13.6(n^2 - 1)/n^2 eV

The following hypotheses form the foundation of Bohr's model:

• He hypothesized that an atom's electron can move within a specified stable, circular orbits around the nucleus without producing radiation.

• Bohr discovered that the electron's angular momentum is quantized in size.

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When an element from group 2 bonds with an element from group 17 an ionic bond is formed, due to electronegativity difference.

Chemical Bonding generally refers to the formation of a chemical bond between two or more atoms, molecules, or ions to give rise to a chemical compound. These chemical bonds are what keep the atoms together in the resulting compound.

Ionic bond, also called as the electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence that is  the outermost electrons of one atom are transferred permanently to another atom.

In the above given case when element from group 2 reacts with the element of group 17, it will form a ionic bond due to the huge electronegativity difference.

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The effect of intermolecular attraction on the properties of gas becomes more significant.

A gas is a substance that has no constant size or form. Whilst inside a closed container, gasoline will amplify to fill the field. An instance of gas is the air you breathe. The gas interior of your digestive tract is fabricated from the air and different gases.

Traits of Gases :

* Gases have neither definite shape nor particular volume. They expand to the dimensions of their container.

* Gases are fluid and go with the flow effortlessly.

* Gases have low density, except compressed.

* Gases diffuse (mix and unfold out) and effuse (tour thru small holes).

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Answer:

D

Explanation:

The answer to question 4) is 5.79×10^22

It is diprotic because it contains two ionizing H atoms. The balanced equation is HSO3- ==> H + SO3-,

However, I believe the question is only requesting the first one to demonstrate that it produces H3O+. H2SO3 plus H2O equals H3O+ plus HSO4 in the net ionic equation. -

Diprotic acids include two acidic hydrogen atoms and include sulfuric acid (H2SO4), carbonic acid (H2CO3), hydrogen sulfide (H2S), chromic acid (H2CrO4), and oxalic acid (H2C2O4).

In an aqueous solution, a diprotic acid is an acid that has the capacity to contribute two hydrogen ions (H+) or protons per molecule. A dibasic acid is another term for a diprotic acid. A polyprotic acid, or an acid with the capacity to contribute more than one proton per molecule, is a form of diprotic acid.

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The white ring of the NH₄Cl is formed at 24.3cm far from Hcl end.

What is grahams law of diffusion?

According to Graham's law, a gas's rate of diffusion or effusion is inversely related to the square root of its molar mass.

What is solid?

Solid ground is a substance that is hard, firm, or compact. having relative firmness, particle coherence, or form permanence as matter that is not liquid or gaseous: solid particles suspended in a liquid. regarding such a matter: Ice is water when it's solid.

According to grahams law of diffusion, rate of diffusion is inversely propotional to square root of its density and molar mass.

r ∝ 1/ [tex]\sqrt{d}[/tex] and γ ∝ 1/ [tex]\sqrt{M}[/tex]

γ NH₃/ γ HCl = [tex]\sqrt{M HCl / M NH3}[/tex] = [tex]\sqrt{36.5/17}[/tex]
1.465/ 1

given that

tube length = 60.0cm

We known that rate = distance / time

Time = distance / rate

let X be the distance travelled by HCl and

60-X be the distance travelled by NH₃

Time taken for HCl = Distance travelled by HCl/ rate of diffusion of Hcl

Time taken for NH₃ =  Distance travelled by NH₃ / rate of diffusion of Hcl

Since both gases are introduced at the same time and travelled same time

distance travelled by HCl (dHCl) / rate of diffusion of HCl = distance travelled by NH₃  ( dNH₃) / rate of diffusion of NH₃ (r NH₃ )

γ NH₃ / γ HCl = d NH₃ / d HCl  = 60-X /X = 1.465/1

60-X = 1.465X

60=2.465X

X=60/ 2.465= 24.34 cm

Therefore, white ring of the NH₄Cl is formed at 24.3cm far from Hcl end.

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Answer:500g

Explanation: 500g

Explination: no chocolete was lost in the chopping of chocolate so it remains 500g

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 126.05g of  Au can be obtained from 136.8g of Au[tex]_2[/tex]S.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

Molar mass of Au[tex]_2[/tex]S = 425.9g/mol

given mass of Au[tex]_2[/tex]S = 136.8g

moles of Au[tex]_2[/tex]S =  136.8÷ 425.9

                       =0.32moles

Moles of Au in Au[tex]_2[/tex]S= 2×0.32moles

                                 = 0.64moles

mass of Au= moles of Au×Molar mass of Au

                    = 0.64×196.96

                   = 126.05g

Therefore,  126.05g of  Au can be obtained from 136.8g of Au[tex]_2[/tex]S.

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The flaw in Regina’s plan is that the time frame is unrealistic (option B).

Goal setting involves the development of an action plan designed in order to motivate and guide a person or group toward a goal, which is a result that one is attempting to achieve.

Effective goal setting lets you measure progress, overcome procrastination and visualize your dreams. However, setting goals is said to be effective when it is done in an adequate time frame.

According to this question, Regina identifies her goal and hastily writes it down as follows: I will make an A on my English literature term paper that is due next week.

This goal, although is great, is unlikely to be met because of the time frame. One cannot get an excellent result in something that lacks adequate preparation, which includes adequate time.

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The pH of the resulting solution is 9.96 that can be calculated by using the using the pOH values.

Buffer Solution is a water solvent primarily based totally answer which includes a combination containing a vulnerable acid and the conjugate base of the vulnerable acid, or a vulnerable base and the conjugate acid of the vulnerable base. They face up to a alternate in pH upon dilution or upon the addition of small quantities of acid/alkali to them.

Millimoles of NH3 = 0.316 x 250 = 79

Millimoles of NH4Br = 0.339 x 250 = 84.75

Millimoles of KOH = 57.3

pOH  = pKb + log [salt - C / base + C]

       = 4.74 + log [84.75 - 57.3 / 79 + 57.3]

      = 4.04

pH + pOH=14

pH=14-4.04

pH = 9.96

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No it would not work because an insulator stops electrons from moving from moving to atom to atom so there is no way to get a charge to the metal leaves

What is metal leaf electroscope

Gold leaf electroscop has two gold leafs suspended from a metal(usually brass) stem in a vacuumed glass jar and connected to a metal cap.  The glass is grounded with the help of a metal foil to make it uncharged. It can be used to:
Detect charge: Body under test is touched with the metal cap. If the leaves diverge, the body is charged and if there is no effect on leaves, then the body is uncharged.
To identify the nature of charge: The electroscope is charged by a known body(say positively charged body) and then the body is removed. Next, the body under test is brought in contact with the metal cap. If the leaves diverge further, the body has same charge(positive) and if the leaves come closer to each other, the body has opposite charge(negative).
Identify a body as conductor or insulator: Take two electroscopes. Charge one of the electroscopes so that its leaves will diverge. Then, connect the two electroscopes by the object under test. If the leaves of other electroscope diverge, the body is a conductor and if there is no effect on the electroscopes, the body is an insulator.

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1.50g was the sample's weight.

The movement of minuscule atoms, molecules, or electrons in solids, liquids, and gases produces heat energy. From one thing to another, excess heat can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.

Briefing:

From the question, we have

q= 9.86 J

C = 0.90 J/g-K

Temperature ΔT = ( 30.5 ºC - 23.2 ºC ) = 7.3 ºC = 7.3 K

The heat (q) absorbed is,

q = m x C x ΔT    

m= q/ (C x ΔT)

m = 9.86 J / ( 0.90 J/g-K ) x 7.3 K ) = 1.50 g

The mass of the sample = 1.50 g

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The molecular formula for a compound with a molar mass of 52 g/mol and an empirical formula of ch is C4H4 (Cyclobutadiene).

Mass of  C=12g

Mass of  H=1g. We can have 4 C's (4*12=48) and 4 H's (4*1=4)

so 48+ 4 is 52. Plus C4H4 has an empirical formula of CH since C4H4can be simplified. Cyclobutadiene is an organic compound with the formula C4H4. It is very reactive owing to its tendency to dimerize. Although the parent compound has not been isolated, some substituted derivatives are robust and a single molecule of cyclobutadiene is quite stable. Since the compound degrades by a bimolecular process, the species can be observed by matrix isolation techniques at temperatures below 35 K. It is thought to adopt a rectangular structure.

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Bromine reacts with 2-butene to form 2,3-dibromobutane. It also reacts with 3-methyl-2-pentene to form 2,3-dibromopentane.

We can build a general rule that bromine reacts with compounds that contain a C=C double bond to give the product expected from addition across the double bond. This approach to understanding the chemistry of organic compounds presumes that certain atoms or groups of atoms known as functional groups give these compounds their characteristic properties.

Functional groups focus attention on the important aspects of the structure of a molecule. We don't have to worry about the differences between the structures of 1-butene and 2-methyl-2-hexene, for example, when these compounds react with hydrogen bromide. We can focus on the fact that both compounds are alkenes that add HBr across the C=C double bond in the direction predicted by Markovnikov's rule.

Bromine, is a chemical element in the periodic table that has the symbol Br and atomic number 35. A halogen element, bromine is a red volatile liquid at standard room temperature which has a reactivity between chlorine and iodine. This element is corrosive to human tissue in a liquid state and its vapors irritate eyes and throat. Bromine vapors are very toxic upon inhalation.

A halogen, bromine resembles chlorine chemically but is less active. It is more active than iodine, however. Bromine is slightly soluble in water, and highly soluble in carbon disulfide, aliphatic alcohols (such as methanol), and acetic acid. It bonds easily with many elements and has a strong bleaching action.

Bromine is highly reactive and is a powerful oxidizing agent in the presence of water. It reacts vigorously with amines, alkenes and phenols as well as aliphatic and aromatic hydrocarbons, ketones and acids (these are brominated by either addition or substitution reactions). With many of the metals and elements, anhydrous bromine is less reactive than wet bromine; however, dry bromine reacts vigorously with aluminium, titanium, mercury as well as alkaline earth metals and alkaline metals.

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The concentration of a solution formed by diluting 25.0 ml of a 3.2 m nacl solution to 135.0 ml is 0.60 mol

M1V1=M2V2

M2=M1V1/V2

M2= 3.2×25.0 ÷ 135.0

M2=0.60 mol.

The term "concentration" in chemistry refers to the elements that make up a mixture or solution. Here's how concentration is defined and how it can be calculated using various techniques. Concentration in chemistry refers to the quantity of a substance in a given area. The ratio of the solute in a solution to the solvent or total solution is another way to define concentration. In order to express concentration, mass per unit volume is typically used. The solute concentration can, however, also be expressed in moles or volumetric units. Concentration may be expressed as per unit mass rather than volume. Although concentration is typically used to describe chemical solutions, it can be calculated for any mixture. Concentration Examples in Units: g/cm3, kg/l, M, m, N, and kg/L

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As increasingly solute is dissolved withinside the solvent, the concentration of the solution is going on increasing.

The osmotic pressure can be expressed as follows:

π=iCRT

With the growth in concentration of the solution, the osmotic stress of the answer increases. Thus, the osmotic stress of answer is extra than the natural solvent. As the concentration of solute is extra in an answer than in natural water, water from natural water attempts to diffuse or go through osmosis to the solution. Hence, the strain required to save you water access to the solution, i.e. osmotic strain of an answer is usually better than that of natural water or solvent.

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If the bond angle between two adjacent hybrid orbitals is 109.5° , the hybridization is sp³ .

When s orbitals combines with three p orbitals (px, py and pz)  four sp³ hybrid orbitals with similar characteristics are formed. These hybrid orbitals have a bond angle of 109.5° between them, which causes the minimum electronic repulsion between them.

An atom in which all the atoms that are bonded to it contains single bonds is an  sp³ hybridized atom. For example-alkanes.

For, sp³ hybridized central atoms, the molecular geometry is a tetrahedron. But, if the geometry is distorted due to lone pairs then trigonal pyramidal or bent geometry is formed.

Thus, option "c" is correct.

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Answer:

group

Explanation: