a polymer with which type of tacticity is expected to exhibit the lowest degree of crystallinity? atactic isotactic syndiotactic

The wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2 is 3.04 x 10^-6 m. This corresponds to a spectral line in the infrared region of the electromagnetic spectrum.

To calculate the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2, we can use the Rydberg formula.

The Rydberg formula relates the wavelengths of the spectral lines emitted by hydrogen atoms to the energy levels of the electrons in those atoms. It is given by:

1/λ = R(1/n1^2 - 1/n2^2)

where λ is the wavelength of the emitted light, R is the Rydberg constant (1.0974 x 10^7 m^-1), and n1 and n2 are the initial and final energy levels of the electron, respectively.

In this case, n1 = 5 and n2 = 2. Plugging these values into the formula, we get:

1/λ = 1.0974 x 10^7 (1/5^2 - 1/2^2)
1/λ = 1.0974 x 10^7 (0.03)
1/λ = 329220
λ = 3.04 x 10^-6 m

Therefore, the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2 is 3.04 x 10^-6 m. This corresponds to a spectral line in the infrared region of the electromagnetic spectrum.

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The salt that produces the solution with the highest pH when dissolved in water is KF (Potassium Fluoride).The correct answer is b.

KF has a strong basic character and so it produces a highly basic solution. LiClO4 (Lithium Perchlorate), KHSO4 (Potassium Hydrogen Sulfate), Li3PO4 (Lithium Phosphate) and BaO (Barium Oxide) are all relatively weakly acidic and so produce solutions with lower pH.

The negative logarithm of the hydrogen ion concentration in a water-based solution is called pH. It represents the acidity or alkalinity of the solution. On a scale of 1 to 14, pH ranges from 0 to 14. The solutions with pH values less than 7 are acidic, those with pH values greater than 7 are alkaline, and those with pH values equal to 7 are neutral.

Salts are compounds made up of cations and anions that are ionically bonded. When they dissolve in water, they dissociate into their constituent ions. As a result, the pH of the solution may be affected. In the given salts, KF produces the solution with the highest pH when dissolved in water.

When dissolved in water, the pH of the solution is influenced by the salt.The negative logarithm of the hydrogen ion concentration in a water-based solution is called pH.pH represents the acidity or alkalinity of the solution.

Salts are compounds made up of cations and anions that are ionically bonded.KF produces the solution with the highest pH when dissolved in water.

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Answer:

2m.

Explanation:

molality = no.of moles of solute ÷ mass of solvent in kg

molalty = 1.5 moles ÷ 0.75 g

            = 2m

The number of moles of N2 produced in the reaction is 3.69 moles. To calculate the number of moles of N2 produced in a reaction, we need to use the ideal gas law equation, PV = nRT.

In this equation, P represents pressure, V represents volume, n represents the number of moles, R represents the gas constant, and T represents temperature.
First, we need to convert the temperature to Kelvin by adding 273.15 to 21.5, which gives us 294.65 K.
Next, we need to convert the volume to litres by dividing 110.0 mL by 1000, which gives us 0.110 L.
Now we can plug in the values we have into the ideal gas law equation:
(2.75 atm)(0.110 L) = n(0.0821 L atm/K mol)(294.65 K)
Simplifying this equation, we get:
0.3025 = 0.0821n
To solve for n, we divide both sides by 0.0821:
n = 3.69 moles of N2

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Number of neutrons = 8

Given

7 protons, 7 electrons, and a mass number of 15.

Required

Number of neutrons

Solution

Within the atom there are subparticles, namely protons, neutrons and electrons

Protons and neutrons are present in the atomic nucleus, while electrons surround the atomic nucleus in the atomic shell

Atomic number = number of protons = number of electrons

Mass number= number of protons + number of neutrons

15 = 7 + number of neutrons

number of neutrons = 8

1-ethoxybut-2-yne is the desired product of synthesis. using the principles of retrosynthetic design, compounds a and b are attached.

The SN2 reaction process needs a nucleophile attack from the carbon atom's contrary side. As a result, the product moves into the stereochemical location that the departing group had previously held. This is referred to as configuration inversion. A good illustration of a stereospecific reaction, in which several stereoisomers react to produce various stereoisomers of the result, is the SN2 reaction. Additionally, the most typical instance of Walden inversion occurs in the SN2 reaction, in which the configuration of an asymmetric carbon atom is reversed.

In the first step of the given reaction, the SN2 reaction between the compound A and NaCH₂CH₃ gives the product B. In the second step after deprotonation of aikyne, it reacts with CH₃Br to give 1-ethoxybut-2-yne.

Complete question and structures are attached.

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The measured quantity 0.0105 L has three significant figures. Significant figures are the digits in a measurement that convey precision, excluding leading zeros and trailing zeros without a decimal point.

In the measured quantity 0.0105 L, there are three significant figures. Significant figures are the digits in a measurement that indicate the precision and reliability of the value. The general rule for determining significant figures is as follows:

1. Non-zero digits are always significant. In this case, the digits "1", "0", and "5" are all non-zero and therefore significant.

2. Leading zeros (zeros at the beginning of a number) are not significant; they act as placeholders. In this measurement, the leading zero before the decimal point is not considered significant.

3. Zeros between significant digits are significant. There are no zeros between the significant digits "1", "0", and "5" in this case.

4. Trailing zeros (zeros at the end of a number) after a decimal point are significant. In this measurement, the trailing zero after the "5" is significant.

By applying these rules, we can determine that the measured quantity of 0.0105 L has three significant figures, representing the precision of the measurement to the hundredth place.

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(a) All the bonds present in urea are polar.

(b) The oxygen atom will carry the partial negative charge at the end of the bond dipole, thus C=O is the most polar bond.

When atoms share their electrons inequitably, polar covalent bonds are formed, whereas non-polar covalent connections are formed when atoms divide their electrons more evenly.The uneven electron sharing is caused by discrepancies in the electronegativities of the two atoms sharing the electrons

(a) All of the bonds in a urea molecule are polar. The compound's formula is [(NH₂)₂CO]. The bonds (C=O, N-H, and C-N) are all polar because to large variances in electronegativities. O has a higher electronegative potential than C, and N has a higher electronegative potential than C and H.

(b) All the bonds present in urea are polar, however, the most polar bond is the connection between carbon and oxygen due to its greater electronegativity than a nitrogen atom (N), thus C=O is the most polar bond.

As the atom that will attracts the electrons due to its electronegative nature, the oxygen atom will carry the partial negative charge at the end of the bond dipole.

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The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.

When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.

A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.

They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.

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Answer: if a biochemical reaction in our body is too fast or too slow it can endanger our life.

Explanation:in other example ,rate of reaction is obviously very important to the chemical industry. The rate of reaction dictates the rate of production our daily products.

Answer:

2:1

Explanation:

Correct option is C)

We can see from the balanced equation, that the mole ratio of hydrogen to oxygen is 2:1 , both in the water molecule and in the reactants, hydrogen gas (H

2

) and oxygen gas (O

2

). The electrolysis of water causes the decomposition of water, (H

2

O), which produces hydrogen and oxygen.

Hello!

Answer:

Nucleus

Explanation:

Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA

Hope this helps have a wonderful day! :3

Answer:

Nucleus

Explanation:

Answer

The negative ion is larger than the original atom.

Explanation:

This means that with fewer electrons but the same number of positive protons, the size of the ionic radius will decrease.

I hope this helped!

According to the equilibrium law, this should move the AgCl equilibrium to the left (i.e., favor the reverse reaction) until the system finds equilibrium once more. This will increase the concentration of Cl-(aq) ions in the solution.

The following equilibrium is established by an AgCl solution that is saturated:

Ag+(aq) + Cl- =>AgCl(s) (aq)

NaCl will entirely separate into ions when added to the solution:

Na+(aq) + Cl=> NaCl(s) (aq)

According to the equilibrium law, this should move the AgCl equilibrium to the left (i.e., favor the reverse reaction) until the system finds equilibrium once more. This will increase the concentration of Cl-(aq) ions in the solution.

Because part of the Ag ions precipitated out, the [Ag+] in the new system will be lower than it was in the original saturated solution, while the [Cl-] ions will be higher (because you added more when you added NaCl). There will have been some precipitation of that excess Cl-, but not all of it. The result will be the same as the Ksp of AgCl if these new ion concentrations are entered into the Ksp equation.

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the question you are looking for is

What would happen to the Ag+ and Cl- concentrations if solid NaCl were dissolved in a saturated solution of AgCl in water?

The properties of a gas based on the kinetic molecular theory of gases describes by, at lower speeds, gas molecules circulate in a structured way.

The ideal gas law's findings may be explained at the molecular level by the kinetic molecular theory of gases. The kinetic molecular theory of gases is based on the initial 5 postulates.:

A gas is made up of many molecules, which move randomly and in great numbers.

Since their distance from one another is much greater than their aggregate volume, gas molecules have a relatively small volume.

Whether they are inclined each other or not, structural differences are so minor.

The average kinetic energy of the gas particles is unaffected by collisions between gas molecules and the container walls since gas molecules collide with one another with each other as well.

All gas particles exhibit the same median kinetic energy at a specific temperature. Any gas's typical kinetic energy of its molecules relies only on its temperature.

Therefore Gas molecules move in an organized pattern at slow speeds.

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The sum of 3(3)/(8) and 6(1)/(2) is 5(5)/(8), which is a mixed number representing 5 whole units and 5/8 of another unit.

To find the sum of mixed numbers, we need to add the whole numbers and the fractions separately. Add the whole numbers: 3 + 6 = 9

Add the fractions: For the fractions 3/(8) and 1/(2), we need to find a common denominator. The least common multiple of 8 and 2 is 8.

Converting 3/(8) to have a denominator of 8:

3/(8) = (3 x 1)/(8 x 1) = 3/(8)

Converting 1/(2) to have a denominator of 8:

1/(2) = (1 x 4)/(2 x 4) = 4/(8)

Now, we can add the fractions:

3/(8) + 4/(8) = (3 + 4)/(8) = 7/(8)

Combine the whole numbers and fractions:

The whole numbers sum was 9 and the fractions sum was 7/(8). We can write this as a mixed number by dividing the numerator (7) by the denominator (8). The quotient is 0 with a remainder of 7. Therefore, the mixed number is 0(7)/(8), which can be simplified to 7/(8).

Therefore, sum of 3(3)/(8) and 6(1)/(2) is 5(5)/(8).

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Answer:

I jus had this but i forgot srry!

Explanation:

Answer:

The weight of the subducted plate produces a force to continue moving the plate.

Explanation:

The equatorial currents are driven by winds.

Global wind systems which are already powered by energy from either the Sun move the ocean's surface currents. The direction of wind, Centripetal forces from either the Earth's rotation, as well as the location of landforms which interact only with currents all affect the patterns of surface waves.

Equatorial countercurrent is a type of current phenomena that can be seen close to the equator. It is an oceanic water flow that runs counter to the Atlantic, Pacific, and Indian seas' westward equatorial currents and therefore is surrounded by them.

Therefore, the equatorial currents are driven by winds.

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Answer:

mole

Explanation:

is a unit of amount of substance in the International System of Units, defined (since 2019) by fixing the Avogadro constant at the given value. Sometimes, the amount of substance is referred to as the chemical amount

a)the number of moles of CaCO3 used is approximately 0.005096 mol. b) the molarity of solution is approximately 0.02038 M. c) the number of moles of the solution is approximately 5.095 × 10^(-4) mol.

a. To find the number of moles of CaCO3 used, we need to divide the given mass by the molar mass of CaCO3.

Given:

Mass of CaCO3 = 0.5100 g

Molar mass of CaCO3 = 100.1 g/mol

Number of moles of CaCO3 = Mass / Molar mass

Number of moles of CaCO3 = 0.5100 g / 100.1 g/mol

Number of moles of CaCO3 ≈ 0.005096 mol (rounded to 4 decimal places)

b. To determine the molarity of Ca^2+ in the 250 mL of solution, we need to use the number of moles of CaCO3 and the volume of the solution.

Given:

Number of moles of CaCO3 = 0.005096 mol

Volume of solution = 250.0 mL = 0.250 L

Molarity of Ca^2+ = Number of moles / Volume

Molarity of Ca^2+ = 0.005096 mol / 0.250 L

Molarity of Ca^2+ ≈ 0.02038 M

c. To calculate the number of moles of Ca^2+ in a 25.0-mL aliquot of the solution, we can use the molarity of Ca^2+ obtained in part (b) and the volume of the aliquot.

Given:

Molarity of Ca^2+ = 0.02038 M

Volume of aliquot = 25.0 mL = 0.025 L

Number of moles of Ca^2+ = Molarity × Volume

Number of moles of Ca^2+ = 0.02038 M × 0.025 L

Number of moles of Ca^2+ = 5.095 × 10^(-4) mol

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The atomic mass of the element is approximately 122.6 amu.

To calculate the atomic mass of the element, we need to consider the weighted average of the masses of its naturally occurring isotopes, taking into account their relative abundances.

Given:

Isotope 1 mass (m1) = 120.9 amu

Isotope 1 relative abundance (a1) = 57.4%

Isotope 2 mass (m2) = 122.9042 amu

To calculate the atomic mass (M) of the element:

M = (m1 * a1 + m2 * a2) / 100

Substituting the given values:

M = (120.9 amu * 57.4% + 122.9042 amu * (100% - 57.4%)) / 100

M = (69.6276 amu + 52.9726 amu) / 100

M = 122.6002 amu / 100

M ≈ 1.226002 amu

Therefore, the atomic mass of the element is approximately 122.6 amu.

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Equations known as rate law link the consumption of the reactants, an observable, to the kinetics of a reaction. The rate is influenced by the reactant concentrations, their thermodynamics, and the precise mechanism of the reaction.

The second-order rate constant kinact/KI (also known as the covalent efficiency constant) explains both the affinity of the initial reversible encounter complex and the maximum rate of covalent bond formation. In the context of enzyme-substrate kinetics, it is comparable to the enzyme specificity constant kcat/KM.

A rate law illustrates how a chemical reaction's rate is influenced by the reactant's concentration. The rate rule for a reaction like aA products typically has the form rate = k[A]n.

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Answer:

B. decreases

Explanation:

The solubility of gases in a liquid is inversely proportional to the temperature, it means that if you increase the temperature, the solubility decreases.

Acid-base balance is a physiological process that demonstrates the integration of homeostasis and chemistry within the human body.

It involves the regulation of pH levels to maintain a stable internal environment. Homeostasis ensures that the body maintains a consistent pH despite internal and external changes, while chemistry underlies the fundamental principles of acid-base reactions and their effects on the body's physiology.

Homeostasis is the body's ability to maintain internal stability by regulating various physiological processes. In the case of acid-base balance, homeostasis ensures that the pH of body fluids, such as blood, remains within a narrow range to support optimal cellular function. It involves the coordination of multiple systems, including the respiratory and renal systems, to regulate the concentration of acids and bases in the body.

Chemistry plays a crucial role in acid-base balance as it governs the behavior of acids and bases and their interactions. The concept of pH, which measures the concentration of hydrogen ions in a solution, is a fundamental principle in chemistry. In the body, acids and bases can be generated through metabolic processes or obtained from external sources. Various chemical reactions, such as the dissociation of acids and bases, buffer systems, and the exchange of gases in the lungs, contribute to maintaining the acid-base balance.

Through the interplay of homeostasis and chemistry, the body's acid-base balance is tightly regulated. The respiratory system helps control the concentration of carbon dioxide (a respiratory acid) through the adjustment of breathing rates, while the renal system regulates the excretion and reabsorption of bicarbonate ions (a major base). These mechanisms ensure that pH remains within the normal range, allowing enzymes, proteins, and cellular processes to function optimally.

Overall, acid-base balance exemplifies how homeostasis and chemistry work together to maintain the stability and functionality of the human body. It showcases the intricate integration of physiological processes and chemical principles to achieve optimal health and function.

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Answer:

C.

Explanation:

It is a different type of the same atom

they have a different number of neurons

Answer: contact metamorphism

Explanation:

Contact metamorphism happens when a body of magma intrudes into the upper part of the crust. Heat is important in contact metamorphism, but pressure is not a key factor, so contact metamorphism produces non-foliated metamorphic rocks such as hornfels, marble, and quartzite.

Answer:

salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.

Answer:

0.74 atm.

Explanation:

From the question given above, the following data were obtained:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 766 mmHg

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Next, we shall convert the pressure of He from mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

766 mmHg = 766 mmHg × 1 atm / 760 mmHg

766 mmHg = 1.01 atm

Finally, we shall determine the partial pressure of Ar. This can be obtained as follow:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 1.01 atm

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Pₜ = Pₙₑ + Pₕₑ + Pₐᵣ

3.27 = 1.52 + 1.01 + Pₐᵣ

3.27 = 2.53 + Pₐᵣ

Collect like terms

3.27 – 2.53 = Pₐᵣ

Pₐᵣ = 0.74 atm

Thus the partial pressure of Ar is 0.74 atm.