which hydrogen atoms would show a signal with a chemical shift between 4.5 and 6.5? there is only one correct choice.

The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule is known as Hydrogen Bond.

An intermolecular force (IMF) known as a hydrogen bond is created when an electronegative atom with a single pair of electrons and a hydrogen atom connected to a strongly electronegative atom is in close proximity to one another. Between molecules, there are intermolecular forces (IMFs). Dispersion forces and regular dipole-dipole interactions are more examples. In general, hydrogen bonds are weaker than true covalent and ionic bonds but stronger than common dipole-dipole and dispersion forces.

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The percent yield would be 40% if 2.50g of the organic fuel was reacted with 2.50g of oxygen and 1.00g of water was produced.

How is the percent yield of an organic molecule determined?

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The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.

The axial tilt also called as obliquity. The axial tilt is the angle between the objects rotational axis and its orbital axis  , perpendicular to the orbital plane. The axial tilt is about 23.5 degree. due to this the sun shines on different latitudes with different angle.

Thus, The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.

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Answer:

A: 2 and 4

Explanation:

ttt

The empirical formula of this compound is ClO₇.

If a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine, then the mass of its oxygen is the difference between the mass of the sample and the mass of its chlorine.

mass compound = mass oxygen + mass chlorine

mass oxygen = mass compound - mass chlorine

mass oxygen = 5.00 g - 1.94 g

mass oxygen = 3.06 g

Determine the number of moles of each component by dividing the mass by its respective molar mass.

moles oxygen = mass oxygen / MM

moles oxygen = 3.06 g / 15.9994 g/mol

moles oxygen = 0.1912571721

moles chlorine = mass chlorine/ MM

moles chlorine = 1.94 g / 70.9060 g/mol

moles chlorine = 0.02736016698

Get the ratio between the two components to determine its empirical formula.

moles oxygen : moles chlorine = 0.1912571721 : 0.02736016698

moles oxygen : moles chlorine = 7 : 1

Hence, he empirical formula of this compound is ClO₇.

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volume of HCl would you need for the neutralization is 4 ml .

What is neutralization reaction  ?

In chemistry, neutralization or neutralization (see spelling difference) is a chemical reaction in which acids and bases react quantitatively with each other. When reacting in water, neutralization does not generate excess hydrogen or hydroxide ions in solution. The pH of the neutralized solution depends on the acidity of the reactants.

In the context of chemical reactions, the term neutralization is used for reactions between acids and bases or alkalis. Historically, this reaction was expressed as

Example:

HCl + NaOH → NaCl + H2O

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The SN2 reaction proceeds most quickly for primary carbons and there's less steric congestion for all of this backside assault.

Secondary as well as tertiary alkyl halides undergo the SN2 reaction more slowly than primary alkyl halides. Since there were only three little hydrogen atoms present, methyl halides interact in SN2 reactions the fastest among the simple alkyl halides.

Due to the fact that tertiary carbocations comprise three alkyl groups and secondary carbocations only have two, the former is more stable. Based on the inductive effect, tertiary carbocation is therefore more stable that secondary carbocation.

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0.021 moles of KCN are required, to prepare a buffer with a pH of 9.230

A buffer, an aqueous solution consists of a mixture of a weak acid and its conjugate base or vice versa. Addition of a small amount of strong acid or strong base hardly changes the pH.

Given,

Volume = 125 mL

Concentration of HCN = 0.420 M

pH = 9.230

Moles of HCN = Volume × Concentration

= 0.125 × 0.420

= 0.0525 moles

HCN + KOH ⇄ KCN + H₂O

0.0525 + X   ⇄    0                     [initially]

(0.0525 - X) + 0  ⇄ X                  [At equilibrium]

pH = pKₐ + log [salt]/[acid]

9.230 = 9.31 + log [salt]/[acid]

-0.08 = log [salt]/[acid]

0.83 = [salt]/[acid]

X / (0.0525 - X) = 0.83

X = 0.021 moles of KCN

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The ph of a solution obtained by dissolving two extra-strength aspirin tablets is 8.

The Concentration of solution is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

Calculation:-

volume = 300 ml = 0.3 L

mass = 450 mg

molar mass  C₉H₈O₄ = 180

mole = mass / molar mass

       =  450/180

      = 2.5 mol

Concentration = mole/volume

                         = 2.5 /0.3

                         =   8.33

PH = - llog[H+]

     = 8.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

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The concentration of water in such a solution in mol/l is 0.0157 M.

Molar concentration is a measure of the concentration of a chemical species, particularly of a solute in an answer, in phrases of quantity of a substance per unit quantity of solution. In chemistry, the most commonly used unit for molarity is the range of moles consistent with liter, having the unit symbol mol/L or mol/dm³ in the SI unit.

Molarity (M) is the quantity of a substance in a certain volume of solution. Molarity is described as the moles of a solute consistent with liters of an answer. Molarity is likewise called the molar attention of a solution.

Calculation:-

The density of the solution is 1.41 g/mL.

1000 g of the solution will have a volume = Mass/ Density

                ​ =  1000 / 1.41

                     =709 ml.

The mass percent of nitric acid is 70%.

1000 g of the solution will have = 1000× 70/100

                                                       =690 g of nitric acid.

The molarity of the solution is  = Mass of nitric acid / The molar mass of nitric acid ×Volume of solution.

Mass of nitric acid = 700 / 63×709

                              = 0.0157 M.

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336 ml of the 11.9 m solution of NaOH do i need to make 2 liters of the 2.00 m NaOH solution

What is Chemical reaction ?

Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day. In nature, chemical reactions can be much more difficult to control and in some cases much more complex than in the laboratory, and generally occur whether you want it or not!In the woods A raging fire, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of fruit on a tree, the transformation of various chemicals, etc... (reactants ) into another group of substances (products) is a so-called chemical reaction.

use M1V1=M2V2

V1 = M2V2/M1 = 336 ml .

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Explanation:

Assume if its asking about molecule particle:

1 mol of AgNO3 = 6.022 x 10^23 molecules

0.75 mol of AgNO3 = 0.75 x 6.022 x 10^23

= 4.5165 x 10^23 molecules

Assume if its asking about atom particle:

AgNO3 has 5 elements

0.75 mol of AgNO3 = 0.75( 5 x 6.022 x 10^23)

= 2.2583 x 10^24 atoms

Subtract the initial mass from final mass, i.e., vm.

Acetylene (C₂H₂) is used in welding torches, because it produces an extremely hot flame when it burns.  grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene is 22 g.

the balanced reaction is given as :

2C₂H₂   +   5O₂    ----->    4CO₂  +   2H₂O

mass of C₂H₂  = 6.50 g

molar mass of C₂H₂ = 26 g/mol

number of moles of C₂H₂  = mass / molar mass

                                            = 6.50 / 26

                                             = 0.25 mol

2 moles of C₂H₂  produced 4 moles of CO₂

0.25 mol of C₂H₂ produced = (4 / 2) × 0.25 = 0.5 mol of CO₂ .

mass of CO₂  = molar mass × moles

                      =    44        × 0.5

                      = 22 g

Thus, Acetylene (C₂H₂) is used in welding torches, because it produces an extremely hot flame when it burns.  grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene is 22 g.

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Shaped volumes around the nucleus which are occupied by electrons are called Atomic Orbitals.

The quantum mechanical refinement of Bohr's orbit is an orbital. In contrast to his idea of a straightforward circular orbit with a constant radius, orbitals are regions of space that were calculated analytically and have varying possibilities of hosting an electron. A Quantum Mechanical Description of Electrons Around the Nucleus

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The percent ionic character of a bond increases with δen. An arbitrary value of 50% ionic character divides ionic from covalent bonding.

When two or more atoms share one or more couples of electrons, a covalent connection is created. These electrons are being drawn to the two neutrons and protons at the same time. A covalent bond is created when the difference between the two atoms' electrical configurations gets too small for an electrochemical reaction to happen and produce ions.

Bonds between atoms in covalent compounds share electrons. They possess distinctive physical characteristics, such as lower melting temperatures and electrical conductivity contrasted to ionic compounds, as a result of the sharing of electrons.

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The longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.

Chromatography is a type of laboratory technique which is performed for the separation of the mixture of different elements into its components. The mixture firstly dissolved in a fluid solvent which is known as the mobile phase, that carries it through a system at which the material called the stationary phase is fixed.

Not all molecules present in the same solute show same behavior. Different molecules show different behaviour. This is due to mainly three reason which arr given as below:

The molecules of solute moves in different direction in the stationary phase, it is due to porosity of the particle that form it.

Thus, we concluded that the longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.

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The quantity of glycine present in analyte as measured by titration is 3mmol.

This titration calculation can be done using dimensional analysis. All values should first be converted to scientific notation: 60 mL NaOH is equal to 6 x 10-2 L NaOH. 1 x 10-1 mol NaOH/L NaOH is equal to 0.1 M NaOH. For every mole of glycine present in the analyte, 2 moles of NaOH have been supplied at the second equivalence point. This is due to the fact that one OH- was necessary to scavenge the COOH group, and a second OH- was required to scavenge the amine. To take this into consideration, we must adjust our computation. Finally: (6 x 10-2 L NaOH) x (10-1 mol NaOH / L NaOH) x (1 mol glycine / 2 mol NaOH) = 3 x 10-3 mol = 3.0 mmol glycine.

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The maximum amount of energy produced in this reaction is -1381.58J

What is mole?

It is defined as amount of a substance that contains exactly 6.02 × 10²³ ‘elementary entities’ of the given substance.

b) mole ratio = moles / balanced coefficient

mole ratio of Al = 3.25 mol/2 mol= 1.62

mole ratio of Fe2O3 = 1.92 mol/1 mole = 1.92

here , Al is the limiting reactant because of lower nole ratio, therefore it produces maximum amount of heat

Since 2 mole Al produces ∆H° rxn = -850.2J

1 mole Al produces ∆H° rxn = -850.2J/ 2

3.25 mole Al produce ∆H° rxn = (-850.2J/ 2) × 3.25

= -1381.58J

Hence energy ∆H = -1381.58J

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An oxygen containing compound shows strong, broad ir absorption at 3200 - 3500 cm⁻¹  the functional group present is carboxylic acid

A carboxylic acid is the functional group combine the feature of alcohol and ketones because it has both the OH bond and C=O bond and therefore carboxylic acid show a very strong and broad band covering a wide range between 2800 to 3500 cm⁻¹ for the OH strech and the range 2850 to 3000cm⁻¹ belong to saturated system while peak 3000 to 3100 indicate an unsaturated system and ir absorption is caused by the interaction between the IR electric field vector and the molecular dipole transition moments related to the molecular vibration

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Titanium is also utilized in the construction of portable computer housings and medical implants. Despite being the ninth most prevalent element in the crust of the Earth, titanium is relatively challenging to extract from its ores. Titanium-containing oxide minerals react with solid carbon and chlorine gas to produce titanium tetrachloride and carbrabon dioxide in the first step of the extraction process.

therefore,

5.01+7.86=12.87

12.87/2.47=19.1%

Yeild Percentage is 19.1%

Minerals are naturally occurring inorganic elements or compounds with an organized internal structure, a distinctive chemical composition, crystal shape, and physical characteristics. The yield percentage is 19.1%. Quartz, feldspar, mica, amphibole, olivine, titanium, and calcite are examples of common minerals.

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In an ecosystem, the effect of the chemical industry  which is a positive one is advancements in medicine.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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There is a difference in the rate of mass change because eggs gain mass when kept in hypotonic solution, whereas they lose mass when kept in hypertonic solution.

Hypertonic solutions contain high concentrations of solutes compared to other solutions. The opposite solution with a lower concentration is called a hypotonic solution. Cells are considered hypotonic when placed in a hypertonic solution.

Hypotonic solution refers to a solution that contains a lesser amount of solute than the solute concentration of another solution through a semipermeable membrane.

Thus, eggs placed in high concentrations of sucrose lost the most weight. So the higher the sucrose concentration, the more water the egg will lose.

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When a system is compressed from 50 liters to 5 liters at a constant pressure of 10 atmospheres, how much work is done must be determined. Therefore, worked on is equal to p delta v less. P stands for pressure and refers to atmosphere. Therefore, we must convert it to newtons per square meter.

The equivalent of 10 atmosphere is 10 times 10 1, 3, and 5. The final volume and its beginning volume are the Newton perimeter square and changing volume. The total number of letters is five.

Additionally, we must afterwards convert into meter cube. Now, one letter equals ten to the power three minus m cube. In order to get 15 times 10 to the power of 3 meter cube, we increase it by 10 to the monastery's -50 L.

volume-temperature (constant pressure) When pressure is constant, a gas's volume and temperature are directly inversely related. When pressure is constant, the volume to temperature ratio remains constant. The term "Charles' law" or "Gay-law" Lussac's refers to this relationship.

When we say that the gases are under constant pressure, we mean that the pressures do not change depending on where we are in the cylinder. Both gases fill the entire space and, as you mentioned, exert different pressures. The partial pressure of a gas is the pressure it exerts within a mixture.

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The volume of oxygen is 14.7 litres.

What is volume?

volume is a measure of occupied three dimensional space.

Sol-Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

m(C₃H₈-propane) = 5.53 g.

n(C₃H₈) = m(C₃H₈) ÷ M(C₃H₈).

n(C₃H₈) = 5.53 g ÷ 44.1 g/mol.

n(C₃H₈) = 0.125 mol.

From chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.

n(O₂) = 0.625 mol.

T = 25° = 298.15K.

p = 1.04 atm.

R = 0.08206 L·atm/mol·K.

Ideal gas law: p·V = n·R·T .

V(O₂) = n·R·T / p.

V(O₂) = 0.625 mol · 0.08206 L·atm/mol·K · 298.15 K / 1.04 atm.

V(O₂) = 14.7 L.

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Answer:

Increase

Explanation:

Fe + CuSO4 - - > Fe2(SO)3 + Cu

If concentration of Fe increases, it will increase the frequency of collisions between the two reactants. Therefore the amount of Cu will also increase.

The model accurately depicts where protons and electrons are in the wave. The proton is in the nucleus and the electron is where it is most likely to be. This is the mechanical model of the atom.

The electron was expected to move in circular orbits according to the Bohr model. On the other hand, orbitals are used in the wave mechanical model to characterise the electron positions. The two are not the same. Protons are located inside the nucleus in the wave mechanical model of an atom, but electrons are present where they are most likely to be.

A subatomic particle with a negative charge is an electron. A subatomic particle having a positive charge is called a proton. The strong nuclear force holds protons together in the nucleus of an atom. A type of subatomic particle without charge is the neutron (they are neutral).

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The volume of a 2.0 m solution of NaOH needed to prepare 494.4 ml of a 0.15 m solution of NaOH is 37.08 ml.

Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.

C₁V₁ = C₂V₂

where C₁ = initial concentration of sample = 2.0 m

V₁ = initial volume of sample

C₂ = final concentration after dilution = 0.15 m

V₂ = total final volume after dilution = 494.4 ml

Plug in the values to the formula and solve for the volume of the solution needed.

V₁ = C₂V₂/C₁

V₁ = (0.15 m)(494.4 ml)/(2.0 m)

V₁ = 37.08 ml

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4.87g of would be prepared 250mL of 0.150M solutions of COCl2 form solid COCl2 and distilled water.

Solution and solvent:

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent. Note that the solvent is the substance that is present in the greatest amount. Many different kinds of solutions exist. For example, a solute can be a gas, a liquid, or a solid.

Let us consider that the solution is dissolved in the solvent.

Here the solution is cobalt(II) chloride and the solvent is distilled water.

The volume of solute is generally ignored, so we would dissolve

250ml . L / 10³ml. 0.150 M . 129.9g/ mol ≈ 4.87g

Therefore 4.87g of cobalt(II) chloride was in approximately 250mL distilled water to create the solution.

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