the pKa of PhC(O)CH2CN is ?

Answer:

Chemistry

Explanation:

Chemistry is considered the central science.

Chemistry is sometimes called "the central science" because it's so important to other fields of science, like biology, geology, astronomy, physics, medicine, engineering, materials science, and many other areas of study.

All the branches of science possess their own level of importance, However, physics deals with the fundamental workings of material reality which are central to all other branches of science.

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In a liquid-liquid extraction (LLE) system with loratadine and pseudoephedrine sulfate, the choice of organic and aqueous phases is crucial for efficient separation.

Loratadine is a non-polar compound, while pseudoephedrine sulfate is more polar due to the presence of a sulfate group. To achieve effective separation, we need to choose a suitable organic phase and aqueous phase.

For the organic phase, a non-polar solvent such as diethyl ether, ethyl acetate, or chloroform can be used. These solvents have good solubility for loratadine. The non-polar organic phase will extract loratadine from the mixture, allowing for separation from the aqueous phase.

As for the aqueous phase, we need to choose a polar solvent that will selectively extract pseudoephedrine sulfate. Aqueous solutions of acids like hydrochloric acid (HCl) or sulfuric acid (H2SO4) can be used. The acidic conditions protonate the pseudoephedrine sulfate, making it more soluble in the aqueous phase.

To perform the extraction, the mixture of loratadine and pseudoephedrine sulfate is added to the LLE system consisting of the organic phase (non-polar solvent) and the aqueous phase (acidic solution). The mixture is then vigorously shaken to ensure thorough mixing and extraction.

After shaking, the phases are allowed to separate, with the more dense aqueous phase settling at the bottom and the less dense organic phase on top. The layers can be carefully separated, and each phase can be further processed to isolate the desired compounds.

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The dish A will be chosen for the top dishes would make the food dish the warmest when placed on top of it.

The term energy is defined as the “ability to perform work, which is the ability to exert a force causing displacement of an object.”

The diagram clearly shows that the dish A contains the highest energy molecules, each with an energy of 30. Heat is an energy form. It is energy that is transferred between substances or systems due to a temperature difference.

Thus, choosing a dish that has maximum energy will provide the maximum heat.

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The number of kilojoules of heat that are absorbed when 0.46 g of chloroethane (C,HCI) is vaporized at its normal boiling point is 0.18 kJ (approx).

Given data,

Amount of chloroethane (C,HCI) vaporized, n = 0.46 g

= 0.46 / 64.52 mol

= 0.0071 mol

Heat of vaporization of chloroethane, ΔH vap = 24.7 kJ/mol

Normal boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure.

Pressure = 1 atm= 101.325 kPa

Therefore, the energy required to vaporize the given amount of chloroethane can be calculated as follows;

ΔH = ΔH_vap*n

= 24.7 kJ/mol × 0.0071 mol

= 0.18 kJ

Hence, the correct option is 0.18 kJ.

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Answer:

substances

Explanation:

A chemical reaction happens when substances break apart or combine to form one or more new substances.

^Hope it helps, Hazel^

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 12 × 5

We have the final answer as

Hope this helps you

The symbol "en" in this context is not related to the chemical reaction given in the question. "en" is actually an abbreviation for ethylenediamine, which is a type of ligand commonly used in coordination chemistry.

When water is added to anhydrous copper(II) sulfate, two observations are made:

The blue color of anhydrous copper(II) sulfate turns into a deep blue color as the water is added. This is because the anhydrous copper(II) sulfate is undergoing an exothermic reaction with the water to form hydrated copper(II) sulfate, which is blue in color.

As more water is added, the color becomes lighter and eventually the solution becomes clear. This indicates that all of the anhydrous copper(II) sulfate has reacted with water to form hydrated copper(II) sulfate.

Cobalt chloride can be used as a test for the presence of water because it is a hydrate that changes color when it loses its water of hydration. Anhydrous cobalt chloride is blue in color, while hydrated cobalt chloride is pink. When water is added to anhydrous cobalt chloride, it reacts with the water to form hydrated cobalt chloride, which is pink in color. This color change can be used to test for the presence of water in a sample.

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\(CH_3CH_2OH\) is a polar compound and has hydrogen bonding. It has a higher boiling point. It will have the lowest vapor pressure among the three compounds.

Vapor pressure is the pressure produced by the vapors of a liquid in a sealed container when the liquid is heated. It is a property of a liquid that describes the tendency of a liquid to evaporate. It is measured in units of pressure, typically in mmHg or torr. The higher the vapor pressure, the more volatile a compound is. So, the decreasing order of vapor pressure for the given compounds is: \(CH_3CH_3 > CH_3CH_2F > CH_3CH_2OH\)

Here, \(CH_3CH_3\) is a non-polar compound while \(CH_3CH_2F\) and \(CH_3CH_2OH\) are polar compounds. The polar compound has hydrogen bonding, which increases the intermolecular forces between molecules. As a result, the polar compound will have a lower vapor pressure than the non-polar compound.

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It is critical to develop a PheDH with specificity and high activity since it is crucial for the manufacture of chiral pharmacological intermediates and the detection of phenylketonuria.

Here, a PheDH gene, pdh, was discovered that encodes a novel BhPheDH with 61.0% similarity to the previously identified PheDH from Microbacterium sp. In comparison to the PheDH from Nocardia sp., the BhPheDH demonstrated superior stability in hot environments (40–70°C) and optimal activity at 60°C and pH 7.0. Additionally, sodium salt has the potential to greatly boost both its activity and thermostability. The residual activity of the BhPheDH was found to be 1.8-fold higher than that of the control group following incubation for 2 hours in 3 M NaCl at 60 °C (without NaCl).

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Answer:17.5

Explanation: (0.5 meters)(35 Joules) =

When the bowler lifts the bowling ball for a distance of 0.5 m, the mass of the bowling ball used by the bowler is 17.3 kg.

The ability to do work is called Energy.

As work done and energy has the same units. The energy required is equal to the work done.

E = W = 35 J

Force acting on the ball is equal to the weight of the ball.

F = Weight =mg

where m = mass of the bowling ball and g = acceleration due to gravity

Substituting the given energy and distance moved, we have

\(35 = m\times9.81\times0.5\\ m=17.3 \:\rm kg\)

Therefore, the mass of the bowling ball is 17.3 kg.

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Answer:

D

Explanation:

Answer:

Answer. As a leaf cell is a plant cell contains chloroplasts for photosynthesis which the root hair cell does not have, leaf cell also contains larger vacuoles and the presence of a cell wall.

Explanation:

Answer:

Zinc Chloride + Difluorine -----> Zinc Fluoride + Dichlorine

Explanation:

ZnCl2 + F2 → ZnF2 + Cl2

Answer:

i think 2?

Explanation:

AI2 O2

srry if wrong but

hope this helps

the area of one of the cat's paws is 4 square centimeters.

The weight of the cat is 4.0 kilograms, which is the force exerted on the scale by the cat's body. The weight per unit area on the scale due to the cat's paws is 0.25 kilograms per square centimeter.

Let A be the area of one of the cat's paws in square centimeters. The weight of the cat is supported by all four paws, so the total force exerted by the paws on the scale is:

force = weight = 4.0 kg

The force exerted by one paw is one-fourth of the total force:

force per paw = force / 4 = 4.0 kg / 4 = 1.0 kg

This force is distributed over the area of one paw, so we can write:

pressure = force per paw / A

where pressure is the weight per unit area, which is given as 0.25 kg/cm

Substituting the values and solving for A, we get:

0.25 kg/cm = 1.0 kg / A

A = 1.0 kg / 0.25 kg/cm = 4 cm

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True. Do not use oil-based products such as Vaseline and body lotions because they destroy latex. Latex is a natural rubber, and when it comes into contact with oil-based products, it reacts chemically.

This reaction causes latex to degrade and lose its elasticity, making it prone to breakage. Therefore, it is important to avoid oil-based products when using latex products, such as condoms, gloves, and other medical supplies. Instead, use water-based products that are safe to use with latex. Water-based products are gentle on the skin and do not react chemically with latex, making them ideal for use with latex products.

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Using this formula, we can calculate the confidence interval once we have the sample data, without the sample data, it is not possible to provide an accurate confidence interval estimate.

To construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system, we would need the sample data, specifically the number of cell phone users and the number of users who developed cancer. Without the sample data, it is not possible to provide an accurate confidence interval estimate.

However, if we assume that we have the necessary sample data, we can proceed with the calculation. The formula for calculating a confidence interval for a proportion is:

Confidence interval

\(=�^±�×�^(1−�^)�Confidence interval= p^​ ±z× np^​ (1− p^​ )​ ​ where:�^p^​\)

 is the sample proportion (number of users with cancer divided by the total number of cell phone users).

\(�\)

z is the z-score corresponding to the desired confidence level (90% confidence level corresponds to a z-score of approximately 1.645).

\(�\)

n is the sample size (total number of cell phone users).

Using this formula, we can calculate the confidence interval once we have the sample data.

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lows will tend to move to region of largest positive pressure tendency. The correct option is A.

Air flows from regions of high pressure to regions of low pressure, driven by the differences in pressure. Therefore, lows will tend to move towards regions of the largest positive pressure tendency. This is because positive pressure tendencies indicate the presence of high pressure systems, which will cause air to move towards the low pressure systems in order to balance out the pressure differences.

On the other hand, negative pressure tendencies indicate the presence of low pressure systems, which will not attract air but instead allow air to flow away from them. Neutral pressure tendencies indicate no pressure gradient, and hence, no air movement.

So, in summary, positive pressure tendencies attract air and cause air to flow towards high pressure systems, while negative and neutral pressure tendencies do not attract air and will not cause air movement. Therefore, the correct option is A positive.

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The phase of a substance that occupies one-half of an open container and the atoms of the substance are closely packed but are still able to slide past each other is a liquid.

In the field of science, such a state in which the substance takes the shape of a container and the molecules can slide past each other is referred to as the liquid state.

The liquid state is the state that comes in between the solid phase and the gaseous phase. In the solid state, the molecules are packed too tightly and in the gaseous state, the molecules can move freely.

Hence, such a substance that has molecules closely packed but still sliding past each other would be a liquid phase.

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Answer:

Explanation:

Meter/ Second

Answer:

Meter/Second North!Brainliest pls :)

Explanation:

Among the given elements, the element with the largest second ionization energy (IE2) is Oxygen (O).

The ionization energy refers to the energy required to remove an electron from an atom or ion. In general, the second ionization energy is higher than the first ionization energy because it involves removing an electron from a positively charged ion.

Oxygen (O) has an atomic number of 8, and its electronic configuration is 1s^2 2s^2 2p^4. When an oxygen atom loses one electron, it forms a positively charged ion, O^+, with the electronic configuration of 1s^2 2s^2 2p^3. To remove a second electron from O^+, it requires a significantly higher amount of energy compared to the other elements provided.

The trend for ionization energy generally increases across a period from left to right in the periodic table. This is because the effective nuclear charge increases, resulting in a stronger attraction between the nucleus and the valence electrons, making it harder to remove an electron. Oxygen (O) is located on the right side of the periodic table, and its second ionization energy is higher than that of lithium (Li), boron (B), fluorine (F), and sodium (Na).

Therefore, among the given elements, Oxygen (O) has the largest second ionization energy.

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Answer:he’s right

Explanation:

Lithium nitride is the only alkali metal nitride which has the chemical formula Li₃N and it reacts with water to produce ammonia and lithium hydroxide. The charges of each ion are +1 and -3. The correct option is B.

The ions which are positively charged are called the cations whereas the ions which are negatively charged are called the anions. The combination of the cations and anions results in the formation of an ionic compound.

In lithium nitride, the cation is Li⁺ and the anion is N³⁻. The charge on the nitride ion is -3 and that of the lithium ion is +1. The total number of electrons present in the molecule is 10. Because the number of protons is 7 and 3 electrons were added from -3 on the nitride ion.

Thus the correct option is B.

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The percent error of Joe’s results is equal to 10.07 %

The percent error can be described as the difference between the actual value and the measured or approximate value. The percent experiment is used in scientific experiments to check the accuracy of the experimental results.

The mathematical formula of the percent error can be represented as:

Percentage error = (Measured value - Exact value)/Exact value] ×100

Given, the volume measured by Joe = 60.1 ml

The actual volume of the object = 54.6 ml

The percent error =  (60.1 - 54.6)/54.6] ×100 = 10.07 %

Therefore, the percentage error of Joe's results is 10.07 %.

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Answer:

Explanation:

Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).

A proportional equation y=kx where k is the so-called "constant of proportionality".

Answer:

by sharing an electron

Explanation:

each of the two bonded atoms share an electron....making a single covalent bond b/w the two....like in....F - F

1.00 pint of milk is equal to 473.18 milliliters, based on the conversion factor of 1 pint = 473.18 milliliters.

To convert pints to milliliters, we can use the conversion factor of 1 pint = 473.18 milliliters.

Since we have 1.00 pints of milk, we can multiply it by the conversion factor to find the volume in milliliters:

1.00 pint * 473.18 milliliters/pint = 473.18 milliliters.

Therefore, 1.00 pint of milk is equivalent to 473.18 milliliters. It's important to note that this conversion factor is based on the standard definition of a pint, which is equal to 473.18 milliliters. In some countries, the pint may have a different value, so it's essential to use the appropriate conversion factor based on the specific context or region.

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To distinguish between cyclohexane and 2-hexene, you can carry out the bromine water test. Chemical equation for the reaction is 2-hexene + Br2 (aq) -> 2,3-dibromohexane

This test is based on the fact that cyclohexane is an alkane and 2-hexene is an alkene. Alkenes readily react with bromine water due to the presence of a double bond, while alkanes do not react.

Add a few drops of bromine water to separate test tubes containing cyclohexane and 2-hexene.

Observe the color change in the test tubes.

Chemical equation for the reaction:

2-hexene + Br2 (aq) -> 2,3-dibromohexane

Upon reaction, the bromine water loses its color in the presence of 2-hexene, while it remains the same in the presence of cyclohexane.

This difference in color change will help you distinguish between the two compounds.

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Answer:

that can be established only by changing a substance's chemical

Explanation:

Answer:

A chemical property is a characteristic of a substance abserved in chemical reactions.

Explanation:

Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.

Answer:

Explanation:

Q1

According to The Ideal Gas Equation :

Q2

Q3

Q4