the pKa of EtCONPhH is ?

Answer:

When the view from Earth is a new moon phase, the view from the Moon would be a full Earth phase.

Explanation:

This is because the new moon phase occurs when the Moon is located between the Earth and the Sun, with the side of the Moon facing the Earth being unlit by the Sun. From the Moon's perspective, the Earth would be fully illuminated by the Sun, and the side of the Earth facing the Moon would be in the full Earth phase.

To prepare a buffer solution of pH = 10.54, the relative masses of dimethyl amine and dimethyl ammonium chloride needed are 0.079 g and 0.067 g respectively.

A buffer solution is a solution that has the ability to resist changes in pH upon the addition of small amounts of acid or base. A buffer solution contains a weak acid and its conjugate base or a weak base and its conjugate acid. It can be prepared by mixing equal volumes of a weak acid and its conjugate base or a weak base and its conjugate acid.

Dimethyl amine is an organic compound with the formula (CH3)2NH. It is a weak base and can act as a proton acceptor. Dimethyl ammonium chloride is an organic compound with the formula (CH3)2NH2Cl. It is a salt of a weak base and a strong acid and can act as a proton donor.

Calculation of relative masses:

The pKa of dimethyl amine is 10.73.

To prepare a buffer solution of pH = 10.54,

the ratio of [A-]/[HA] should be 1/9.

Using the Henderson-Hasselbalch equation;

pH = pKa + log([A-]/[HA])10.54 = 10.73 + log([A-]/[HA])

log([A-]/[HA]) = -0.19[A-]/[HA] = 0.67/1.00

The sum of the masses of dimethyl amine and dimethyl ammonium chloride is 0.146 g. The ratio of their masses is 0.67:1.00.

So, the relative masses of dimethyl amine and dimethyl ammonium chloride needed are 0.079 g and 0.067 g respectively.

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Answer:

4 mol MgO

Explanation:

convert the limiting reactant to product by using dimensional analysis in order to see how many moles total can be created of the product

4 mol Mg x \(\frac{2 mol MgO}{2 mol Mg}\) = 4 mol MgO

Answer:

91.12 gram

Explanation:

Number of moles of Ammonia = 5.36

Molecular Mass of Ammonia = 14 + 3 × 1 = 17 gram/mol

Mass = Number of moles × Molecular mass

Mass = 5.36 mol × 17 gram/mol = 91.12 gram

Answer: 5 atoms

Explanation:

Modelling of block copolymers produces porous nanostructured carbons with easily accessible nitrogen, improving their chemical (electrical) performance for catalytic and energy storage applications.

Mass copolymer modelling refers to a method of creating porous nanostructured carbon atoms with easily accessible nitrogen, thereby improving their chemical (electrical) performance. In this process, a bulk copolymer is used as a template, guiding the formation of carbon materials with specific pore structures.

The resulting porous carbon material provides a high surface area and exposes nitrogen atoms that can participate in various chemical reactions, making the material advantageous for applications such as storage devices. energy storage or catalyst.

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Answer:

ΔS⁰ = -181.1J/molK

Explanation:

ΔS⁰ of a reaction is defined as the sum of the entropies of the reactants times its reaction coefficient minus the sum of the entropies of the products times its reaction coefficient. For the reaction in the problem:

ΔS⁰ = 2*S{NaCl(s)} - (2*S{Na(s)}+S{Cl2(g)})

ΔS⁰ = 2*72.1J/molK - (2*51.1J/molK + 223.1J/molK)

Answer:

A.

Explanation:

Miners were happy due to the result of the gold rush. they labored very hard for very little profit. Working in the Yukon Territory was not safe. To reach it, the ground had to be dug. Then the dirt had to be removed to get the gold.

In paragraph 2, what does the phrase "miners of all shapes and sizes" mean that many people were invited. This included food, clothing, transportation equipment, etc.

Taking into account the definition of molarity, the molarity of the solution is 2.17 g/mL.

A solution is a homogeneous mixture where all the particles that exist in it. The chemical present in the greatest quantity is called the solvent, while the other components are called solutes.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= mass÷ volume

Molarity is expressed in units mol/L.

In this case, you have:

Replacing in the definition of molarity:

molarity= 0.0326 moles÷ 0.015 L

Solving:

molarity= 2.17 moles/L

Finally, the molarity of the solution is 2.17 g/mL.

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Answer:

it most likely goes with your meal

Explanation:

hope this helps

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

8

Explanation:

i dunno i think its right tho

Answer:

decreases, increases

Explanation:

In general for main-group elements atomic size decreases from left to right across a period and increases down a group

The following descriptions and/or equations best represent the enthalpy change of a system: C. The heat absorbed or released during a phase change or chemical reaction at constant pressure; E. ΔH = ΔE + PΔV; F. H = E + PV.

Enthalpy (H) is a thermodynamic property that represents the total heat content of a system. It takes into account both the internal energy (E) of the system and the work done by or on the system in the form of pressure-volume work (PV).

Option C states that enthalpy change occurs during a phase change or chemical reaction at constant pressure. This is because at constant pressure, the heat absorbed or released by the system is equal to the change in enthalpy.

Option E, ΔH = ΔE + PΔV, represents the equation for calculating the change in enthalpy, where ΔE is the change in internal energy and PΔV is the pressure-volume work done.

Option F, H = E + PV, directly defines enthalpy (H) as the sum of internal energy (E) and pressure-volume work (PV).

These options highlight the relationship between enthalpy, internal energy, and work in the context of phase changes, chemical reactions, and constant pressure conditions.

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Answer:

Molecules that contain only carbon and hydrogen are Hydrocarbons.

Green plants absorb sunlight with a frequency of approximately 4.67 x 10^14 Hz to power photosynthesis.

To calculate the frequency of sunlight with a wavelength of 642 nm that is strongly absorbed by chlorophyll for photosynthesis, we'll need to use the following formula:

Frequency (ν) = Speed of light (c) / Wavelength (λ)

First, we'll convert the given wavelength from nanometers to meters:

1 nm = 1 x 10^(-9) m
642 nm = 642 x 10^(-9) m = 6.42 x 10^(-7) m

Now, we'll plug the values into the formula:

Speed of light (c) = 3.00 x 10^8 m/s
Wavelength (λ) = 6.42 x 10^(-7) m

Frequency (ν) = (3.00 x 10^8 m/s) / (6.42 x 10^(-7) m)

Frequency (ν) ≈ 4.67 x 10^14 Hz

So, green plants absorb sunlight with a frequency of approximately 4.67 x 10^14 Hz to power photosynthesis.

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Answer:

Ca generally loses two electrons from its outer shell to form a Ca2+ ion.

A buffer solution is defined as a solution that resists a change in pH when a small amount of acid or base is added to it. the buffer capacity of the solution will prevent the pH from changing too much.

The buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will experience the following changes when a small amount of HClO4 is added to it: The HClO4 added to the buffer solution will react with the potassium nitrite, KNO2, to form the salt, KClO4.T

he HNO2 will be converted to nitric acid, HNO3, by the HClO4.The HNO3 formed in the previous step will react with the potassium nitrite, KNO2, to form nitric oxide, NO, and potassium nitrate, KNO3.The net effect of adding HClO4 to the buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will be to shift the buffer solution to a more acidic pH range.

However, the buffer capacity of the solution will prevent the pH from changing too much.

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L1 and L2 can be separated by the process of fractional distillation and L2 and L4 can be separated by the process of separation.

The method for separating crude oil into clusters of hydrocarbons with similar numbers of carbon molecules is known as fractional distillation. These groups of hydrocarbons are referred to as "fractions." Hydrocarbons with short chains. Short-chain hydrocarbons are hydrocarbons with few carbon atoms.

Fractional distillation is used to purify water as well as separate ethanol and water. Fractional distillation is used in many industries, including oil refineries and chemical plants, to purify and separate many organic compounds.

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I understand the question you are looking for :

1. The table below shows liquids that are miscible and those that are immiscible

Liquid L3 L4

L1 Miscible Miscible

L2 Miscible Immiscible

Use the information given in the table to answer that questions that follow;

i) Name the method that can be used to separate L1 and L2 from a mixture of the two

ii) Describe how a mixture of L2 and L4 can be separated

Answer:

4.9 cm³

Explanation:

Given data:

Mass value = 8.3 kg

Density = 1.7 kg/cm³

Volume = ?

Solution;

In given question from the units we got to know that the mass and density value is given and we have to calculate the volume.

Thus, we will apply density formula.

Density = mass/ volume

d = m/v

1.7 kg/cm³ = 8.3 kg/ v

v =  8.3 kg/ 1.7 kg/cm³

v = 4.9 cm³

Thus, the volume is 4.9 cm³.

There is ionic bonding between Mg²⁺ ions and NO₃⁻ ions.​ A Further explanation is below.

Ionic bonding seems to be a form of interaction wherein the cationic as well as unpaired electrons are powerfully electrostatically connected.

Thus the above response i.e., option D) is correct.

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Answer:

80.2

Explanation:

we subtract 18.2 from the total percentage which is 100%

The measured dipole moment of a polar covalent compound is 1.11 D with a percent ionic character of 18.2%. Therefore, the bond length of this compound will be 1.270 angstrom.

Dipole moment results due to the separation of charges in a compound. Dipole moment can occur between the two ions present in an ionic bond or between the atoms present in a covalent bond. Dipole moment occurs due to the differences in electronegativity of atoms. The larger the difference in electronegativity between ions, the larger the dipole moment of the compound.

The bond length of the compound can be calculated with the help of the formula:

Measured dipole moment = 1.11 D

Theoretical bond length = 4.8×bond length

Percentage ionic character =  (μ₁ / μ₂) × 100

where, μ₁ = μ theoretical,

μ₂ = μ experimental

Putting the values in formula we get,

18.2 = (1.11/ 4.8 × bond length) × 100

Bond length = (1.11/ 4.8 × 18.2) × 100

Bond length = 111/ 87.36

Bond length = 1.270

Therefore, the bond length of the dipole is 1.270 angstrom.

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In this reaction, the minor product formed will be 1-methylcyclohexene.

Let's understand this in detail:

Here's a step-by-step explanation:

1. Dehydration: The acid-catalyzed dehydration of 2-methylcyclohexanol involves the removal of a water molecule (H2O) from the alcohol molecule to form an alkene.

2. Isomer: An isomer is a compound with the same molecular formula but a different arrangement of atoms in space. In this case, we are comparing 1-methylcyclohexene and 3-methylcyclohexene as possible products.

3. Zaitsev Rule: According to Zaitsev's Rule, when an alkene is formed in a dehydration reaction, the more stable (and therefore more substituted) alkene is the major product. The more substituted alkene has more alkyl groups attached to the double bond, resulting in greater stability.

In the acid-catalyzed dehydration of 2-methylcyclohexanol, the major product will be the more stable, more substituted alkene, 3-methylcyclohexene. Consequently, the minor product will be the less stable, less substituted isomer, which is 1-methylcyclohexene.

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In the acid-catalysed dehydration of 2-methylcyclohexanol, the minor product cyclohexene isomer formed is 1-methylcyclohexene.

This reaction involving acid-catalysed dehydration of 2-methylcyclohexanol favours the formation of the more stable 3-methylcyclohexene as the major product due to the Zaitsev's rule.

Zaitsev's rule states that the more substituted alkene will be the major product in an elimination reaction. Acid catalysed dehydration is a prominent chemical reaction used for conversion of alcohols into alkenes. It occurs by heating the alcohol at high temperature in the presence of a strong acid ,eg, nitric acid. If the alcohol is not heated at proper high temperature, then the alcohol will not convert into alkene but will undergo conversion to ethers.

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One way that the layers of the atmosphere help to maintain life on Earth is by absorbing and scattering harmful solar radiation, such as ultraviolet (UV) radiation.

The ozone layer, which is located in the stratosphere layer of the atmosphere, absorbs most of the Sun's harmful UV radiation, preventing it from reaching the Earth's surface where it can cause DNA damage and skin cancer. Additionally, the atmosphere helps regulate the Earth's temperature by trapping heat from the Sun through the greenhouse effect, which is essential for maintaining a stable and habitable climate. The atmosphere also contains oxygen, which is necessary for the survival of many living organisms.

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An indicator of a chemical change which is shown in the image (see attachment) is: A.) formation of a gas.

A chemical change can be defined as a type of reaction that is typically characterized by a change in chemical composition and this leads to the formation of a new chemical substance.

This ultimately implies that, a chemical change would give rise to the chemical properties of matter by causing the transformation of one chemical substance into one or more different chemical substances.

In this context, we can infer and logically deduce that the formation of a gas is an indicator of a chemical change in the image (see attachment) shown below because the liquid turned to a gas when heat was applied.

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Complete Question:

Which indicator of a chemical change is shown?

A.) formation of a gas

B.) formation of a precipitate

C.) change in color

D.) change in energy

The molecular geometry of molecules is given serially as, tetrahedral,trigonal,tetrahedral,tetrahedral,linear,linear.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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Answer:

1120 mm Hg

plus give brainliest

The equation for the production of sulfur trioxide gas from sulfur dioxide (57.50 g) and oxygen (20.0 L) using the ideal gas law indicates;

The volume of sulfur trioxide that will be formed at STP is 20.1 L

The volume of sulfur trioxide formed at 15.0°C and 98920 Pa is 21.7 L

The ideal gas law is an equation of state that describes an ideal gas behavior. It relates the pressure (P), volume (V), and temperature (T) of a gas to the number of moles (n) of the gas and the universal gas constant. The equation is written as P·V = n·R·T

The balanced chemical equation for the reaction is: 2SO₂ (g) + O₂ (g) --> 2SO₃ (g)

First, we need to convert the given amounts of reactants to moles. We can do this by using the molar mass of SO₂ (64.07 g/mol) and the ideal gas law for O₂ (P·V = n·R·T). At STP (Standard Temperature and Pressure), the temperature is 0°C (273.15 K) and the pressure is 1 atm (101325 Pa). The gas constant R is 8.314 J/Kmol.

The number of moles of SO₂ is: 57.50 g/(64.07 g/mol) = 0.897 moles

The number of moles of O₂ is; (101325 Pa)·(20.0 L)/(8.314 J/K.mol)·(273.15 K) = 0.892 moles

Since the ratio of SO₂ to O₂ in the balanced equation is 2:1, SO₂ is the limiting reactant and will determine the amount of product formed.

The number of moles of SO₃ produced is; (0.897 mol SO₂)·(2 mol SO₃/2 mol SO₂) = 0.897 mol (Which is based on the number of moles of SO₂ in the reactant side of the equation)

To find the volume of SO₃ at 15°C and 98920 Pa, we can use the ideal gas law again; P·V = n·R·T

Therefore, the volume of sulfur trioxide formed at STP is 20.1 L and at 15°C and 98920 Pa is 21.7 L

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