the antihistamine piperoxan was synthesized using the reaction of catechol and epichlorohydrin in the presence of sodium page 708 hydroxide as the first step. write a mechanism for this reaction

The ways in which metals can be protected from corrosion include the following below:

This is common with metals and is a process which occurs as a result of its exposure to the surroundings. This results in metals forming a stable oxide thereby leading to the deterioration of the material.

There are however several ways to protect them from corrosion such as painting and the use of corrosion inhibitors such as chromates etc which helps to coat it and prevent the oxidation process from occurring thereby making it the correct choice.

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Answer:

Formula Weight of gas sample = 20.1 g/mole => Neon (Ne)

Explanation:

Use Ideal Gas Law formula to determine formula weight and compare to formula weights of answer choices.

PV = nRT = (mass/fwt)RT => fwt = (mass/Volume)RT = Density x R x T

Density = 0.900 grams/L

R = 0.08206 L·atm/mole·K

T = 0.00°C = 273Kfwt = (0.900g/L)(0.08206L·atm/mole·K )(273K)

= 20.1 g/mol => Neon (Ne)

The original mass of Rn-222 was 0.2 grams.

The quantity of substance in an item or system is measured by its mass, which is a fundamental physical attribute of matter. It is a measurement of an object's resistance to changes in motion and is often expressed in kilogram (kg) or gram (g) units. It's common to conflate weight—the force of gravity acting on an object—with mass. However, weight varies according to the strength of the gravitational field, whereas mass is constant no matter what gravitational field it is in.

The decay of Rn-222 can be modeled using the following equation:

N(t) = N₀ ×  \(\frac{1}{2} ^\frac{t}{T}\)

where N(t) is the amount of Rn-222 remaining at time t, N₀ is the initial amount of Rn-222, T is the half-life of Rn-222, and  \(\frac{1}{2} ^\frac{t}{T}\) is the fraction of  Rn-222 remaining after time t.

We are given that the half-life of Rn-222 is 3.823 days and that 0.05 grams remain after 7.646 days. Using the equation above, we can set up the following equation:

0.05 grams = N₀ × \(\frac{1}{2} ^ \frac{7.646}{3.823}\)

Solving for N₀, we get:

N₀ = 0.05 grams /  \(\frac{1}{2} ^ \frac{7.646}{3.823}\)

N₀ = 0.05 grams / 0.5²

N₀ = 0.05 grams / 0.25

N₀ = 0.2 grams

Therefore, the original mass of Rn-222 was 0.2 grams.

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Answer:

the oil spreads to cover the water

Answer:

I think it is ; The oil floats to the surface of the water

Explanation:

I don't know about the other one.

Answer: B. Shared electrons

Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.

The first ionization energy of magnesium is larger than that of sodium because magnesium has one more proton present in its nucleus to hold on to the electrons in the 3s orbital.

First ionization energy is defined as the energy that is required to remove the first electron from a neutral atom. First ionization energy is numerically same as the orbital energy of the electron but it is of opposite sign.

The second I.E is so much greater for Na than for Mg because after losing its one electron it becomes more stable by attaining noble gas configuration and hence more enthalpy is required to remove an electron from the stable atom.

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Thus, in this reaction, carbon has a greater oxidation number of +2 in carbon monoxide (CO) compared to its oxidation number of zero in elemental lead (Pb).

In the reaction where litharge (PbO) is roasted in the presence of carbon monoxide (CO) to produce elemental lead, the carbon in carbon monoxide has a greater oxidation number compared to carbon in elemental lead.

In carbon monoxide (CO), the oxidation number of carbon is +2. This is because oxygen generally has an oxidation number of -2, and since the compound is neutral, the sum of the oxidation numbers must be zero. Therefore, the oxidation number of carbon in CO is calculated as: (+2) + (-2) = 0.On the other hand, in elemental lead (Pb), the oxidation number of carbon is zero. This is because elemental substances are considered to have an oxidation number of zero.The oxidation number reflects the electron distribution and the transfer of electrons during a chemical reaction, providing insights into the reactivity and bonding of the elements involved.

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Answer:

Thecinically it is both because and  an un opened bottle of soda is homogeneous and an opened bottle of soda is herterogeneous. I hope this helps please reward branlist.

True. In major keys, the tonic (I), subdominant (IV), and dominant (V) triads are major.

This is because the major scale follows a specific pattern of whole and half steps, and the tonic, subdominant, and dominant notes fall on the first, fourth, and fifth scale degrees respectively.

When these notes are harmonized to form triads, they naturally result in major chords. However, it's important to note that in minor keys, the subdominant and dominant triads are often different (minor or diminished) than in major keys.
True, in major keys, the tonic, subdominant, and dominant triads are major. In a major key:

1. Tonic triad (I) is formed using the 1st, 3rd, and 5th scale degrees and is major.
2. Subdominant triad (IV) is formed using the 4th, 6th, and 1st scale degrees and is also major.
3. Dominant triad (V) is formed using the 5th, 7th, and 2nd scale degrees and is major as well.

These three triads are crucial in establishing the tonality of a major key and are all major in quality.

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Answer:

2-Methyl-5-nitrothiophene  

Explanation:

The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.

Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.

Answer : The letter represents the activated complex is, B.

Explanation :

Activated complex : When the reactant molecules absorb energy, their bonds are loosened and new loose bonds are formed between them.

The intermediate thus formed is known as an activated complex or it is also known as transition state complex.

It is unstable and immediately dissociates to form the stable products. In the graph, it is present at the higher point.

In the given graph, F represent the reactant energy, B represent the activated complex, G represent the product, Y represent the reactant, C energy of the reaction.

Hence, the activated complex is located at point B.

Answer:

b

Explanation:

The statement that identifies an oxidation-reduction reaction is a reaction in which oxidation numbers change (option C).

A redox or oxidation-reduction reaction is a chemical reaction in which some of the atoms have their oxidation number changed.

In a chemical reaction that involves oxidation and reduction, the oxidation number of the involved ions either decreases or increases.

Therefore, the statement that identifies an oxidation-reduction reaction is a reaction in which oxidation numbers change.

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Answer:

0.012atm pressure

Explanation:

pressure is inversly proportional to volume. Mathematically,

V1/P1=V2/P2

The best model of weathering is using a fan on a pile of sand causing the sand to move into a pile in a new location.

Weathering refers to the gradual breakdown of a rock due to the agents of denudation. The agents of denudation could be physical, chemical or biological.

The breakdown of rocks leads to the formation of soil. The closest model to the weathering of rock is using a fan on a pile of sand causing the sand to move into a pile in a new location.

The pile represents the rock which is being broken down as the fan blows the pile and it settles on a new location.

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Answer:

1. Element is Ca

2. 20 electrons

3. 2 valence electrons

4. 4 energy levels

Fuel consumption and other atoms than carbon and hydrogen, such as sulfur, nitrogen, or oxygen, have a direct impact on carbon dioxide emissions.

Charcoal, a solid, and oxygen, a gas, are the reactants in the described reaction, and carbon dioxide gas is the result. It is possible to write the chemical equation as C (s) + O2 (g) CO2 (g) Q.

Since heat is produced during the reaction, it is an exothermic reaction. As carbon and oxygen combine to generate carbon dioxide, it is a combination reaction. It is a combustion reaction because oxygen causes carbon to burn.

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The particles in a liquid are also attracted to each other, but not as strongly as in a solid. The particles are close together, moving constantly, and can slide past one another.

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The concentration of a solution that is prepared by dissolving 15 mg of NaCl in 200 mL water is 75 ppm. So, the correct option is a.

To calculate the concentration in parts per million (ppm), we need to determine the amount of NaCl dissolved in the solution and then convert it to ppm.

Mass of NaCl = 15 mg

Volume of solution = 200 mL

First, we need to convert the volume from milliliters (mL) to liters (L):

Volume of solution = 200 mL = 200/1000 L = 0.2 L

Next, we can calculate the concentration of NaCl in mg/L:

Concentration (mg/L) = (mass of solute in mg) / (volume of solution in L)

Concentration (mg/L) = 15 mg / 0.2 L = 75 mg/L

Finally, we can convert the concentration from mg/L to ppm:

Concentration (ppm) = Concentration (mg/L) = 75 ppm

Therefore, the concentration of the NaCl solution is 75 ppm, which corresponds to option (a).

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Zinc- nickel single flow batteries with improved cycling stability by eliminating zinc accumulation on the negative electrode. Electrochim. Acta 145, 109–115. doi: Zinc accumulation is recognized as one of the most critical issues that affect the cycle life of zinc-nickel single flow batteries (ZNBs).

High performance zinc-nickel coatings provide superior corrosion resistance, especially for items used in challenging situations.

A special composition that will corrode less quickly than zinc alone is produced by alloying nickel and zinc. This alloy coating, with a composition of roughly 10-15% nickel and the remaining zinc, can offer up to ten times the protection of traditional zinc plating.

Due to considerations including extended product warranties, longer life cycle requirements, stricter safety regulations, and decreased environmental effect, there is an increased demand for Zinc Nickel Large across sectors. Following applications commonly call for zinc-nickel:

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Answer: 2.856km

Explanation: 1000m = 1km

2856m / 1000 = 2.856km

Answer:

unit formula??

Explanation:

Answer:

C. Transpiration, evaporation, and sublimation.

Explanation:

thank you to the internet.

Aliasing is a significant issue in the fields of computer graphics, signal processing, and audio processing.

Here are the costs and benefits of aliasing and how to avoid it .Benefits of Aliasing The main benefit of aliasing is that it reduces the amount of data needed to represent an image, signal, or sound, resulting in lower costs for storage and processing. Costs of Aliasing The primary cost of aliasing is that it can cause distortions in the image, sound, or signal that are being represented. This may result in a loss of image or sound quality. In some cases, it can even cause the signal to become completely unintelligible.

This is particularly true when the signal has a high frequency, which is prone to aliasing.

Explanation of how to Avoid Aliasing To avoid aliasing, the following steps should be taken:

Under sampling: It refers to the act of sampling a signal at a lower rate than the Nyquist frequency. As a result, the signal is not reconstructed properly, resulting in aliasing. Therefore, the sampling rate must be increased.

Oversampling: It refers to the act of sampling a signal at a higher rate than the Nyquist frequency. In oversampling, a signal is sampled at a higher frequency than its maximum frequency, which eliminates aliasing.Noise Shaping: It is a technique that reduces noise levels in digital signals. This process involves adding noise to the signal before quantizing it.

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The balanced equation for the reaction between aqueous zinc bromide (ZnBr₂) and solid aluminum (Al) to produce aqueous aluminum bromide (AlBr₃) and solid zinc (Zn) is:

3ZnBr₂ + 2Al -> 2AlBr₃ + 3Zn

In this reaction, three moles of zinc bromide (ZnBr₂ ) react with two moles of aluminum (Al) to yield two moles of aluminum bromide (AlBr₃) and three moles of zinc (Zn). The equation is balanced in terms of both mass and charge, ensuring that the number of atoms of each element is the same on both sides of the equation.

This reaction represents a single replacement or displacement reaction, where aluminum replaces zinc in the compound to form a new compound and release zinc as a solid product.

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The question is incomplete, the complete question is;

Zinc and sulfur react to form zinc sulfide by the equation shown below. How many grams of ZnS can be formed when 12.0 g of Zn reacts with 6.50 g of S? (Atomic mass: Zn = 65.38, S = 32.06).

Answer:

17.5 g of ZNS

Explanation:

The equation of the reaction is;

Zn(s) + S(s) ------->ZnS(s)

Number of moles of Zn = 12.0/65.38 = 0.18 moles

Number of moles of S = 6.50/32.06 = 0.20 moles

Hence Zn is the limiting reactant

If 1 mole of Zn yields 1 mole of ZnS

Then 0.18 moles of Zn also yields 0.18 moles of ZnS

Mass of ZnS produced = 0.18 moles *  97.44 g/mol = 17.5 g of ZNS

Answer:

17.5 g of ZNS

Explanation:

Answer:

The bag of skin that holds and helps to protect the testicles. The testicles make sperm

Explanation:

Burning of diesel and coal produces a suffocating and corrosive gas-Sulphur dioxide gas, and Petrol engines give off gaseous oxides of nitrogen. Oxides of these sulphur and nitrogen dissolves in rain water and causes Acid Rain

Answer:

Burning of coal and diesel release sulphur dioxide gas. It is an extremely suffocating and corrosive gas. Sulphur dioxide and nitrogen oxide dissolve in rain water to form acid. Such rain is called acid rain.

Explanation:

Answer: If a pinch of mercury is consumed you will die from it so using a mercury thermometer is very unsafe if its breaks and a child consumes that mercury.

Explanation:

Don't use one

If the glass breaks and the mercury is not properly cleaned up, the little silvery ball within a mercury thermometer might be hazardous. As the mercury evaporates, it may pollute the air around and turn dangerous to both people and animals.

Children that have been exposed to mercury have lower IQs, hearing impairments, and worse coordination.

Long-term exposure worsens and exacerbates symptoms, which may lead to personality changes or even coma.

Mercury thermometers can be replaced by a number of things:

These non-mercury fever thermometers are significantly safer and equally accurate as mercury thermometers.

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Answer:

13.123.

Explanation: