Which of the following explains why 4-aminophenol is acetylated at the amine group rather than the phenol group

The empirical formula of lindane, a powerful insecticide, is \(C_{6} H_{6} Cl_{6}\).

Lindane is a member of a group of compounds whose empirical formula is \(C_{n} H_{m} Cl_{p}\) . In the case of lindane, it has six carbon atoms (C6), six hydrogen atoms (H6), and six chlorine atoms (Cl6). The empirical formula represents the simplest ratio of elements present in a compound, and in this case, it shows that lindane consists of six carbon atoms, six hydrogen atoms, and six chlorine atoms.

Lindane, also known as gamma-hexachlorocyclohexane (γ-HCH), is a chlorinated hydrocarbon that has been widely used as an insecticide due to its effectiveness against a variety of pests. The compound belongs to the group of chlorinated compounds that share the same empirical formula of \(C_{n} H_{m} Cl_{p}\) .

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Answer: HBr

Explanation:

The limiting reactant in the reaction is HBr.

Limiting reactant is the defined as the reactant which determines the maximum amount of product(s) that will be formed. As when it's all used up, the reaction stops and cannot proceed further, since the other reactant doesn't have anything to react with.

The limiting reactant provides the information about the amount of the products formed, as opposed to the reactant in excess which doesn't provide any valuable information.

The given reaction is already balanced. Hence, it gives us the information that 2 moles of Al requires 6 moles of HBr.

2Al + 6HBr ⇒ 2AlBr₃ + 3H₂

If 8 moles of Al will be reacted, it will require 24 moles of HBr, but we only have 8 moles of HBr.

On the other hand, if 8 moles of HBr will be reacted, it will only require 8/3 moles of Al which will leave excess Al unreacted. Reacting 8 moles of HBr with 8 moles of Al will produce 8/3 moles AlBr₃ and 4 moles H₂.

Hence, the limiting reactant is HBr.

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The pH of a 0.0005 M solution of (amphetamines)₂SO₄(aq) at 25°C is approximately 6.89.

To find the pH of a 0.0005 M solution of (amphetamine)₂SO₄(aq) at 25°C, we need to first determine the concentration of the amphetamine ion, then use the Kb value to find the concentration of H₃O⁺ ions, and finally calculate the pH.

1. Determine the concentration of amphetamine ion:
In (amphetamine)₂SO₄, there are 2 amphetamine ions for every 1 sulfate ion. So, the concentration of amphetamine ions is 2 * 0.0005 M = 0.001 M.

2. Use the Kb value to find the concentration of H₃O⁺ ions:
Kb = [H₃O⁺][A⁻]/[AH]
Where A⁻ is the conjugate base of amphetamine and AH is the protonated amphetamine.

Rearranging the equation for [H₃O⁺]:
[H₃O⁺] = Kb * [AH]/[A⁻]

Since [AH] = [A⁻] (due to the stoichiometry of the reaction), we can simplify the equation:
[H₃O⁺] = Kb * [AH]

Now, we can plug in the values:
[H₃O⁺] = (1.3 x 10⁻⁴) * 0.001 M = 1.3 x 10⁻⁷ M

3. Calculate the pH:
pH = -log10[H₃O⁺]
pH = -log10(1.3 x 10⁻⁷) ≈ 6.89

Therefore, the pH of the 0.0005 M solution of (amphetamine)₂SO₄(aq) at 25°C is approximately 6.89.

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Answer:

(3)

Explanation:

Guaranteed. Look at my comment for linked picture explanation!

Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Flash flood occurs when there is a large amount of rainfall and runoff in a specific area.

A flash flood can be described as rapid flooding of low-lying areas: washes, rivers, dry lakes, and depressions. This type of flood may be caused by heavy rain with a severe thunderstorm, hurricane, or tropical storm, or snowfields.

Flash floods also occur after the collapse of a natural ice or a human structure such as a man-made dam. Flash floods are differentiated from normal floods by having a timescale of less than six hours between rainfall and the onset of flooding.

If there is a large volume of surface runoff over a short period of time for a specific area can cause a flash flood.

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Among the given compounds, the compound with the lowest boiling point is NH₃ (ammonia). Option a is correct.

The boiling point of a compound depends on its intermolecular forces, which are affected by the size, shape, and polarity of the molecule. The stronger the intermolecular forces, the higher the boiling point. NH₃ has the lowest boiling point because it is a small, polar molecule with only weak dipole-dipole forces between its molecules. Additionally, NH₃ does not have any hydrogen bonding between its molecules, which would make the intermolecular forces stronger.

On the other hand, CH₄ (methane) is a nonpolar molecule with only weak London dispersion forces between its molecules. HCl (hydrogen chloride) and H₂S (hydrogen sulfide) are polar molecules with stronger dipole-dipole forces than NH₃. Therefore, they have higher boiling points than NH₃. Hence answer is option a.

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--The complete question is, Which compound has the lowest boiling point?

NH₃, CH₄CH, HCl, H₂S--

Answer:

A weak acid has a low concentration of H+ Ions and a dilute acid is a solution where acid is dissolved in a more volume of water than that of acid.

Answer: The equilibrium constant for the reverse reaction at the same temperature is \(2.40 \times 10^{33}\).

Explanation:

The given reaction equation is as follows.

\(2HCl(g) \rightleftharpoons H_{2}(g) + Cl_{2}(g)\) ... (1)

It's equilibrium constant (K) value is \(4.17 \times 10^{-34}\).

Also, another reaction equation is as follows.

\(H_{2}(g) + Cl_{2}(g) \rightleftharpoons 2HCl(g)\)

This is the reverse of equation (1). Hence, its equilibrium value is calculated as follows.

\(K' = \frac{1}{K}\\= \frac{1}{4.17 \times 10^{-34}}\\= 2.40 \times 10^{33}\)

Thus, we can conclude that the equilibrium constant for the reverse reaction at the same temperature is \(2.40 \times 10^{33}\).

Answer:

H, Na, N

Explanation:

Answer:

H, NA, N

Explanation

At 298.15K, carbon dioxide's production enthalpy is H f = -393.5 kJ/mol CO 2. (g).

The most stable form of oxygen under ordinary conditions, which is also diatomic oxygen gas, O2, is what we use to create the oxygen gas. Therefore, nothing will change as we switch from O2 to O2. Enthalpy does not alter since there is no change. In light of this, the standard enthalpy of formation is zero.

Think about how gaseous nitrogen reacts with itself. Nitric oxide gas is created when N2(g) reacts with gaseous oxygen O2(g) (g). High temperatures are used to conduct this reaction. These kinds of reactions, in which the system absorbs heat, are known as endothermic reactions.

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Answer: Actual Yield

Answer:

Anhydrous calcium chloride  dissolves and becomes liquid

Anhydrous copper (ii) sulphate will produce crystal particles

Explanation:

Anhydrous calcium chloride is deliquescent and hence when it is exposed to air, it absorbs water from air. After absorbing water, it dissolves and after some time a pool of clear liquid appears.

Anhydrous copper (ii) sulphate will form crystal structures  and the following reaction will takes place

CuSO4 + 5 H20 --> CuSO4.5H2O

Answer: i believe it would be A

Answer:

a and d

Explanation:

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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Answer:

masses are constant in chemical reactions

Explanation:

 I assume you are asking why you might get more mass out of a reaction between a metal and an acid with respect to the mass of the metal you put in.......

Metals tend to form salts in acids.......

When  metals form metal oxides, the oxide layer causes the extra mass. When acids reacts with metals, they form their metallic salts.

Metals are electropositive elements. In periodic table, the s block elements and d- block elements are metals. They are electron rich and easily loss one or more electrons from their valance shell.

Metals reacts with nonmetals such as oxygen, nitrogen, carbon etc. by donating electrons to them. Electronegative elements such as oxygen easily reacts with metals forming metal oxides.

Acids reacts with metals with donating the hydrogen ion or proton into the metal. That's why anionic acids are less mass than the acids with the protonated form.

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Edge length of unit cell (pm): Calculated using density and molar mass.

Molecular radius (pm): Half the edge length of the unit cell.

To calculate the edge length of the unit cell in picometers (pm), we need to use the density and molar mass of buckminsterfullerene (C60).

1. Calculate the molar mass of C60:

The molar mass of carbon (C) is approximately 12.01 g/mol. Since buckminsterfullerene (C60) consists of 60 carbon atoms, the molar mass of C60 is:

molar mass of C60 = 12.01 g/mol × 60 = 720.6 g/mol

2. Calculate the volume of the unit cell:

Density is defined as mass per unit volume. Given the density of 1.65 g/cm^3, we can calculate the volume of 1 mole of C60 using the molar mass and density:

volume of 1 mole of C60 = molar mass of C60 / density of C60 = 720.6 g/mol / 1.65 g/cm^3

3. Convert the volume to cubic picometers:

To convert the volume from cm^3 to pm^3, we need to use the conversion factor:

1 cm^3 = 1 × 10^24 pm^3

So, the volume of 1 mole of C60 in picometers is:

volume of 1 mole of C60 (in pm^3) = volume of 1 mole of C60 (in cm^3) × 1 × 10^24

4. Calculate the edge length of the unit cell:

The face-centered cubic unit cell consists of 4 C60 molecules. Since the unit cell is cube-shaped, the volume of the unit cell is equal to the volume of 1 mole of C60 divided by 4:

volume of the unit cell = volume of 1 mole of C60 / 4

The edge length of the unit cell can be calculated by taking the cube root of the volume of the unit cell.

5. Calculate the molecular radius:

The molecular radius is half the edge length of the unit cell.

Performing these calculations will yield the values for the edge length of the unit cell and the molecular radius in picometers (pm).

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Answer:

The electron cloud model describes electrons as the most likely found around the nucleus of an atom. It is also found that electrons could seemingly be everywhere at one time.

Explanation:

Hope this helped

Because the cuvette's walls can vary in breadth, this is the case. If you don't enter it exactly the same way each time, it will change how much light passes through the sample and will have an impact on your results.

The cuvette has a line that must line up with the sample holder's line because of this. hence, readings had no impact.

The cuvette's route length in the spectrophotometer should always stay the same.

This is because the radiation should have a constant path length as it goes through the sample inside the cuvette. By doing this, the cuvette through which the light will travel won't get scratched.

Scratches on the cuvette will result in inaccurate measurements of the concentration or absorbance that is being assessed, producing inaccurate findings.

Therefore, the line on the cuvette is always aligned with that of the sample holder in order to establish a uniform path length and obtain accurate findings.

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The component that reduces the main pressure for a typical gas furnace is the gas valve.

What is a gas furnace?

What is a gas valve?

How is pressure reduction done?

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Answer:

Kc = [CaO] [O2] / [CaCO3]

Explanation:

Equilibrium constant, Kc is simply defined as the ratio of the concentration of products raised to their coefficient to the concentration of the reactants raised to their coefficient.

Thus, we can write the equation for the equilibrium constant, Kc for the reaction given in the question above as follow:

CaCO3(s) <==> CaO(s) + O2(g)

Kc = [CaO] [O2] / [CaCO3]

Answer:

I'm pretty sure it's the cell membrane

Answer:

The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays

Explanation:

Answer:

Scale

Explanation:

Answer:

standard pressure is equal to 1 atm.

Explanation:

When NaCl is placed in water, it becomes an aqueous solution, one thing that occurs in this situation is that NaCl, which is an ionic compound, will dissociate into Na+ and Cl-, this dissociation into ions will cause the solution to become a good conductor of electricity. Therefore the correct answer will be letter A

Answer:

B

Explanation:

He, Ne, At, Kr, Xe and Rn are all group 18 or group Vlll or group 0 of the periodic table. Other options are periods

All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.

Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.

Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.

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The strength of steel increases with an increase in carbon content. The more carbon that is dissolved in iron, the less it will corrode and the stronger it will become. In general, the increase in carbon percentage increases tensile strength but reduces ductility and toughness.

Higher carbon content lowers steel's melting point and its temperature resistance, but increases its hardness and strength. Carbon also helps to reduce the size of iron crystals, which affects their physical characteristics by making them stronger and harder. The percentage of elongation will decrease as carbon content increases.

The reduction in percentage elongation is due to the fact that increasing carbon content causes steel to harden, which leads to a reduction in ductility. In general, steel with low carbon content has high ductility and elongation, while steel with high carbon content has low ductility and elongation.

As the carbon content increases, the percentage area reduction also decreases. This is because an increase in carbon content makes steel more brittle, which reduces its ability to deform without cracking. Carbon has a significant effect on the ductility of steel, reducing it as carbon content increases. As the carbon content increases, the steel becomes more brittle, making it more likely to crack or break under stress.

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The correct reactant ratio for the reaction 2Fe + 3Cl2 → 2FeCl3 is 2 moles of iron (Fe) for every 3 moles of chlorine (Cl2).

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