the impure residue left after boiling away a solution of cocaine hydrochloride and baking soda is called

Answer:

From top to bottom electropositivity increases

Left to right it reduces

Explanation:

Electropositivity is also known as metallicity. It is a measure of the tendency of atoms of an element to lose electrons. It is closely related to the ionization energy and indeed the electronegativity.

An allylic carbocation is an example of a system that is:

An allylic carbocation is a resonance-stabilized carbocation with a formal charge of +1 on an allylic carbon in each of the two resonance forms.

Thus, it is correct to state that:

An allylic carbocation is an example of a system that is:

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Full Question:

An allylic carbocation is an example of a(n) _______ system. (Select all that apply.)

- localized

- isolated

- delocalized

- conjugated

Answer:

Sulfur tetra fluoride

Explanation:

The chemical condition that describes the electrons in a water molecule being shared unequally between the hydrogen and oxygen atoms is called polar covalent bonding.

In polar covalent bonds, the electrons are unequally shared due to the electronegativity difference between the atoms involved. In the case of a water molecule, oxygen is more electronegative than hydrogen, causing the oxygen atom to attract the shared electrons more strongly.

As a result, the oxygen atom becomes slightly negatively charged while the hydrogen atoms become slightly positively charged. This polarity gives water its unique properties, such as its ability to form hydrogen bonds and its high surface tension.

In summary, that this describes the unequal sharing of electrons in a water molecule due to the electronegativity difference between hydrogen and oxygen atoms.

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Empirical formula of ascorbic acid Vitamin C or ascorbic acid is an important nutrient required for healthy growth and development.

The molecular formula of ascorbic acid is C6H8O6. The percentage composition of elements in ascorbic acid is as follows:40.92% of Carbon4.58% of Hydrogen54.50% of Oxygen. To find the empirical formula of ascorbic acid, you need to assume that you have 100 grams of the compound. So, the mass of each element is as follows: Carbon: 40.92 gramsHydrogen: 4.58 gramsOxygen: 54.50 gramsConvert the mass of each element into moles by dividing it by its molar mass. Carbon: 40.92/12.01 = 3.41 moles Hydrogen: 4.58/1.01 = 4.54 molesOxygen: 54.50/16.00 = 3.41 molesNow divide each of the mole values by the smallest mole value, which is 3.41 in this case.Carbon: 3.41 / 3.41 = 1Hydrogen: 4.54 / 3.41 = 1.33Oxygen: 3.41 / 3.41 = 1The mole ratio of C:H:O atoms in the empirical formula is 1:1.33:1.The empirical formula of ascorbic acid is CH4O3.The molecular formula for ascorbic acidThe molecular mass of ascorbic acid is given as 176 amu. The molecular formula is the main answer we're looking for. To find it, you need to divide the molecular mass of ascorbic acid by the empirical formula mass.C6H8O6 empirical formula mass = 12.01 × 6 + 1.01 × 8 + 16.00 × 6 = 176.06 amu. Molecular formula = empirical formula × n176 amu = 176.06 amu × n = n × empirical formula empirical formula is CH4O3 n=5The chemical formula of ascorbic acid is C5H5O5.

The empirical formula of ascorbic acid is CH4O3 and the chemical formula for ascorbic acid is C5H5O5.

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Answer:

Catalysts play a significant role in transesterification of vegetable oils. ... Eggshell has a large amount of calcium carbonate that can be ...

‎Abstract · ‎Introduction · ‎Catalysis in transesterification · ‎Conclusion and prospects

Explanation:

The industrial production of biodiesel is catalyzed by calcium carbonate catalyst which increases the rate of reaction many folds. The cost of catalyzed reaction decreases as activation energy decreases.

Catalyst is a substance that enhance the rate of any chemical reaction without participating in the chemical reaction. Catalyst generally increases the rate of reaction by lowering the activation energy of that chemical reaction.

Biodiesel is formed by reaction of vegetable oil. For the conversion of vegetable oil to biodiesel oil we use calcium carbonate as catalyst.

As we said earlier that catalyst reduces activation energy that means requires less energy for conversion. So we need lower cost to provider lower energy. Hence use of catalyst reduces costs.

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Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure , which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.

Amino group, R group, and the carboxylic acid group. Hence, option B is correct.

Amino acids are the monomers that makeup proteins.

Each amino acid has the same fundamental structure, which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.

Hence, option B is correct.

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The total 3-phase power from the source is approximately 186650.03 VA with an angle of 29.09°.

The total 3-phase power from the source can be calculated by multiplying the line currents by the line-to-neutral voltage and the square root of 3.

Given that the line currents are 15<(30)a, we need to convert this value to rectangular form in order to perform the calculation. In rectangular form, 15<(30)a can be written as 15*cos(30°) + j*15*sin(30°). Using trigonometric identities, we can calculate the real and imaginary components of the current as 12.99 + j*7.5.

Next, we multiply the line-to-neutral voltage, which is 7200<(0)v, by the square root of 3. The square root of 3 is approximately 1.732. Multiplying these two values gives us 7200*1.732 = 12474.4 volts.

Now, we can calculate the total 3-phase power by multiplying the line currents in rectangular form by the line-to-neutral voltage. Multiplying (12.99 + j*7.5) by 12474.4 gives us 162073.976 + j*94123.68 volt-amperes.

Finally, we can convert this complex power value back to polar form to get the magnitude and angle. The magnitude can be calculated as sqrt((162073.976)^2 + (94123.68)^2) = 186650.03 volt-amperes. The angle can be calculated as atan(94123.68 / 162073.976) = 29.09°.

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Answer:

Equation 2, because K being more reactive, exchanges position with Pb in PbNO3.

Explanation:

Equation 2, because K being more reactive, exchanges position with Pb in PbNO₃. PbNO₃ + KI reaction can be used to extract lead metal from lead nitrate solution. Therefore, option A is correct.

The chemical element lead has the atomic number 82 and the letter Pb for its symbol. It is a dense, hefty metal that is heavier than the majority of everyday materials. Lead is pliable and soft, and it also has a low melting point. Lead has a tinge of blue when it is first cut, and it is bright and gray. When exposed to air, it tarnishes to a drab gray tone.

Lead is still often used in a variety of products, including some solders, lead crystal glass, pigments, ammunition, cable sheathing, lifting and diving weights, and weight belts. Corrosive liquids are frequently stored in it.

The chemical element lead has the atomic number 82 and the symbol Pb. Lead is a solid at normal temperature and is categorized as a post-transition metal.

Therefore, option A is correct.

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The correct answer is simple molecular structure.

What is a molecule?

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The answer is B, darling

Hope this helps

The log Kow of 1,2,2,4-tetrachlorobenzene (TECB) is: 4.5

This meaning that TECB has a relatively high affinity for lipid-rich tissue such as fish. If the measured concentration of dissolved TECB in water is 4 ng/liter, we can estimate the concentration of TECB in the rainbow trout. We can do this by using the partition coefficient, which is calculated by dividing the concentration of the compound in the organism.

For example, if the concentration of TECB in the fish is 5 ng/g and the concentration of TECB in the water is 4 ng/liter, then the partition coefficient would be 5/4 or 1.25. Therefore, the concentration of TECB in the rainbow trout would be estimated to be 5 ng/g if the measured concentration of dissolved TECB in water is 4 ng/liter.

It is important to note that this estimated concentration is dependent on the partition coefficient and could vary depending on the conditions and environment in which the rainbow trout are living. Additionally, the estimated concentration of TECB could vary depending on the age and size of the rainbow trout as well as the temperature and pH of the water.

Therefore, it is important to consider these factors when estimating the concentration of TECB in the rainbow trout.

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Hydrogen is the chemical element that is placed separately from the other elements because it has atomic number 1.

It is the simplest chemical element (consisting of only one proton and one electron) with atomic number 1.

It is the lightest of the elements and the most abundant in the universe and in the earth's crust,  in the atmosphere, hydrogen is found as a colorless, odorless and flammable gas, in its molecular form H2.

Therefore, we can conclude that Hydrogen is the chemical element that is placed separately from the other elements because it has atomic number 1.

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Success in science is mainly linked to emphasis on Experiment .

In order to succeed in science it is required to do hard work and continuous work with the lots of dedication and discipline. Which is the important quality needed for many jobs, but for succeeding in science what  is really important is this field is highly demanding and it also involves a great deal of uncertainty, and the persistence of uncertainty over long periods.

Hence, Experiment plays key roles in science ,and this is One of the important process to test theories and to provide the basis for scientific knowledge. It can also result in formation of new theory, either by showing that an accepted theory is incorrect or correct .

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Hi! Solubility of materials in water depends on several factors, including polarity, intermolecular forces, and lattice energy. Here's an explanation with the terms you've requested:

1. Polarity: Water is a polar molecule, meaning it has a positive and negative end due to uneven distribution of electrons. Polar substances dissolve well in water (like dissolves like). Molecular solids with polar molecules will generally be soluble in water.

2. Intermolecular forces: There are various intermolecular forces, such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Solids with intermolecular forces that are compatible with water's polarity will dissolve more readily.

3. Lattice energy: Molecular solids have a lattice structure, and the energy required to break this lattice determines their solubility. If the energy gained from solvation (interaction with water molecules) is greater than the lattice energy, the solid will dissolve.

Petroleum is insoluble in water because it is nonpolar and mostly consists of hydrocarbon molecules. These molecules have weak London dispersion forces and are not attracted to water's polar nature. Consequently, petroleum doesn't dissolve in water.

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In the RGB color model, each color is represented by a numerical code that is written in parentheses and separated by commas.

RGB is a color model with which it is possible to represent a color by mixing by adding the three primary colors of light.

A special feature of this model is that it is not a reference point for defining the color red, green, or blue because the same RGB values can display noticeably different colors on different devices.

To form a color, it must be taken into account that in the RGB model the incidence of each color (red, green or blue) is measured on a scale that goes from 0 to 255.

These values are represented in parentheses, separated by commas as shown in the image below:

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Answer:

Put simply, Asexual reproduction is reproduction without the use of gametes or the number of chromosomes being changed. So they are genetically identical creatures. Some animals include wasps,  lizards, sharks, turkeys, and sea urchins.

Sexual reproduction includes chromosomes and gametes being fused, creating genetically different offspring. Examples of creatures that reproduce sexually are humans, chickens, cow, pigs, etc.

Explanation:

Answer: The chemical formula is Ch(HCO3)2 and Cn(HO3)2

Explanation:

There is 1 atom of Ba, 2 atoms of hydrogen, 2 atoms of carbon, and 6 atoms of oxygen.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

The chemical formula Ba(HCO3)2 tells us about the number of atoms of each element present​ as follows:

1 atom of Ba

2 atoms of hydrogen

2 atoms of carbon

6 atoms of oxygen.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

Explanation:

A petrifying well is a well which gives objects a stone-like appearance. If an object is placed into such a well and left there for a period of months or years, the object acquires a stony exterior.

\(\huge\purple{Hi!}\)

carbon atom can form four covalent bonds.

Answer:

See explanation

Explanation:

The reaction between alcohol and acidified potassium dichromate  is a redox reaction. This reaction can be used to detect a drunken driver.

Alcohols can be oxidized to aldehydes, ketones and carboxylic acids depending on the structure of the alcohol. Primary alcohols yield adehydes and carboxylic acids while secondary alcohols are oxidized to ketones.

The colour of the acidified potassium dichromate turns from orange to green when exposed to alcohols from the breath of a drunken driver.

To find the molar mass of CaSO₄ 2H₂O, you need to add the atomic masses of all the elements present in the compound. The molar mass of CaSO₄ 2H₂O is 146.24 g/mol.

The molar mass of a substance is the mass of one mole of the substance and is expressed in units of grams per mole (g/mol). To calculate the molar mass of CaSO₄ 2H₂O, you need to know the atomic masses of calcium (Ca), sulfur (S), oxygen (O), and hydrogen (H).

Calcium has an atomic mass of 40.08 g/mol, sulfur has an atomic mass of 32.06 g/mol, oxygen has an atomic mass of 16.00 g/mol, and hydrogen has an atomic mass of 1.01 g/mol. To find the molar mass of CaSO₄ 2H₂O, you need to multiply the number of each element in the compound by its atomic mass and then add up all of the masses.

CaSO₄ 2H₂O, which means that there is one calcium atom, one sulfur atom, four oxygen atoms, and ten hydrogen atoms in the compound. Multiplying the number of each element by its atomic mass and adding up all the masses gives you the molar mass of CaSO₄ 2H₂O:

(1 x 40.08 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) + (10 x 1.01 g/mol) = 40.08 g/mol + 32.06 g/mol + 64.00 g/mol + 10.10 g/mol = 146.24 g/mol

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If 30 ml of a 0.80 m solution of k is mixed with 50 ml of a 0.45 m solution of clo−4, a precipitate will be observed in this solution.

The solution contains k (potassium) and clo−4 (chlorate) ions and we are to find out if a precipitate will form or not. The ksp for the following equilibrium is 0.004. kclo4(s)↽−−⇀k (aq) clo−4(aq)

We can obtain the molarity of k ions as follows: 0.80 M = (moles of K)/(0.030 L)Moles of K = 0.80 M × 0.030 L = 0.024 mol

We can obtain the molarity of clo−4 ions as follows: 0.45 M = (moles of clo−4)/(0.050 L)Moles of clo−4 = 0.45 M × 0.050 L = 0.0225 mol

The concentration of K and clo−4 ions are 0.8 M and 0.45 M respectively. Now, we need to calculate the reaction quotient Q of the solution to find out whether the precipitate will form or not. Q = [K+][clo−4] = 0.8 M × 0.45 M = 0.36

Since Q (0.36) > Ksp (0.004), the reaction quotient is greater than the solubility product constant. It indicates that the product is more than what it should be. The excess products will precipitate to form a solid. Hence, we can say that a precipitate will be observed in this solution.

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Bromine is more reactive than chlorine.

The rate of the SN1 reaction, which is more reactive with bromine, depends only on the concentration of the alkyl halide. The higher is the concentration of substance, the faster is the reaction rate of that substance. The nature of the alkyl halide also affects the reaction . The secondary and primary alkyl halides reacts slower than tertiary alkyl halide.

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For the reaction 2A + 3B → 4C + 5D, product D is formed at a rate of 10 µM/sec. At this moment, the rate of formation of C (in µM/sec) is 6.

A rate of reaction is the measure of the speed at which a chemical reaction happens. It is the speed at which the reactants are transformed into the products of the reaction. In other words, the rate of reaction shows the change in the concentration of the reactants or products as time passes. The reaction rate can be affected by various factors like temperature, pressure, concentration, and catalysts.For the given reaction 2A + 3B → 4C + 5D, the rate of formation of D is given to be 10 µM/sec. At this point in time, we have to find the rate of formation of C. The coefficients of A and B are 2 and 3 respectively. We can start by determining the amount of D formed with respect to A and B. 5 moles of D are formed for every 2 moles of A and 3 moles of B reacted. This can be written as: D/A = 5/2 and D/B = 5/3Now, we can determine the rate of reaction of A and B by multiplying their coefficients with their respective rates. Let's assume that the rate of formation of A and B are x and y µM/sec respectively. Then, D is formed at a rate of (5/2)x µM/sec and (5/3)y µM/sec. We are given that the rate of formation of D is 10 µM/sec. Therefore, (5/2)x + (5/3)y = 10 µM/secMultiplying by 6, we get 15x + 10y = 20Multiplying by 2/5, we get 6x + 4y = 8Dividing by 4, we get 3x/2 + y = 2The rate of formation of C can be determined from the equation 2A + 3B → 4C + 5D. For every 4 moles of C produced, 5 moles of D are produced. Therefore, the rate of formation of C is (4/5) * 10 = 8 µM/sec.

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The total volume of the solution is 1005 mL after adding 5 mL of 0.50 M HCl, we can assume that the volume change is negligible, and the concentrations of HA and A- remain the same.

A buffer typically consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer's ability to resist changes in pH comes from the equilibrium between the weak acid and its conjugate base.

To calculate the pH after adding 5.0 mL of 0.50 M HCl to 1 liter (1000 mL) of the buffer solution, we need to consider the buffer's composition and the effect of the added acid.

Since you haven't provided the exact composition of the buffer, I'll assume it consists of a weak acid and its conjugate base. Let's denote the weak acid as HA and its conjugate base as A-. The buffer is designed to resist changes in pH when small amounts of acid or base are added.

When HCl is added, it will dissociate into H+ and Cl- ions. The H+ ions from HCl will react with the conjugate base A- in the buffer, forming the weak acid HA. This reaction helps maintain the pH of the buffer.

To calculate the pH after the addition of HCl, we need to know the initial concentrations of HA and A- in the buffer and the pKa of the weak acid HA. With this information, we can use the Henderson-Hasselbalch equation:

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

Given that the total volume of the solution is 1005 mL after adding 5 mL of 0.50 M HCl, we can assume that the volume change is negligible, and the concentrations of HA and A- remain the same.

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After adding 5.0 mL of 0.50 M HCl to 1 liter of a buffer solution with an initial concentration of 0.10 M and a \(pKa\) of 5.0, the pH of the buffer will be determined using the Henderson-Hasselbalch equation: \(pH = 5.0 + log([0.10 M + (0.50 M x (5.0 mL/1005 mL))]/[0.10 M])\).

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation, which is \(pH = pKa + log([A-]/[HA])\).
In this case, 5.0 mL of 0.50 M HCl is added to 1 liter of the buffer solution, resulting in a total volume of 1005 mL. To calculate the pH, we need to know the \(pKa\) value of the buffer and the concentrations of the acidic form \(([HA])\) and the conjugate base \(([A-])\).
Let's assume the \(pKa\) of the buffer is 5.0. We can use the equation to calculate the ratio \([A-]/[HA]\). Since the concentration of HCl added is much higher than the initial concentration of the buffer, we can assume that the concentration of [HA] remains approximately the same. Therefore, the concentration of [A-] will be equal to the initial concentration of the buffer plus the concentration of HCl added.
Let's say the initial concentration of the buffer is 0.10 M. After adding 5.0 mL of 0.50 M HCl, the concentration of [A-] would be 0.10 M + (0.50 M x (5.0 mL/1005 mL)).
Now, substitute the values into the Henderson-Hasselbalch equation: \(pH = 5.0 + log(([A-]/[HA]))\). Calculate the ratio \([A-]/[HA]\) and substitute it into the equation to find the \(pH\).
This calculation will give you the pH of the buffer solution after adding the HCl.

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The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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The gas particles in each sample have the same average kinetic energy.

(a) Sample B has the highest partial pressure of gas B because it occupies the smallest volume, causing its gas particles to collide with the container walls more frequently, leading to a higher number of collisions and a greater force per unit area on the container walls. This results in a higher partial pressure of gas B in sample B compared to samples A and C.

(b) Sample C has the lowest partial pressure of gas B because it has the largest volume, causing the gas particles to have more space to move around and collide with each other, reducing the number of collisions and the force per unit area on the container walls. This results in a lower partial pressure of gas B in sample C compared to samples A and B.

(c) The average kinetic energy of gas particles is directly proportional to their temperature. Therefore, the sample with the highest temperature will have gas particles with the highest average kinetic energy. From the given information, we cannot determine the temperature of each sample, but we can assume that the samples are at the same temperature because they have the same volume and pressure.

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