in the accepted mechanism for acetal hydrolysis, how many steps can be classified as nucleophilic attack?

Answer: Thus the yield of uranium from 2.50 kg \(U_3O_8\) is 2.12 kg

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number \((6.023\times 10^{23})\) of particles.

To calculate the number of moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{molar mass}}\)

moles of \(U_3O_8=\frac{2.50\times 1000g}{842g/mol}=2.97mol\)    (1kg=1000g)

As 1 mole of \(U_3O_8\) contains = 3 moles of U

2.97 mole of \(U_3O_8\) contains = \(\frac{3}{1}\times 2.97=8.91moles\) moles of U

Mass of Uranium=\(moles\times {\text {Molar mass}}=8.91mol\times 238g/mol=2120g=2.12kg\)  

 ( 1kg=1000g)

Thus the yield of uranium from 2.50 kg \(U_3O_8\) is 2.12 kg

Answer:

start moving faster

Explanation:

i would guess because they slow down our freeze when they get cold

Answer:

Density = 0.27 decagrams/cm³

Explanation:

From conversion tables, we know that;

1 g/cm³ = 0.1 decagrams/cm³

We are given;

Density of aluminium = 2.7 g/cm³

Thus;

Density = 2.7 * 0.1

Density = 0.27 decagrams/cm³

Answer:

270000 decagrams/m³

Explanation:

1.

Density=mass/Volume

=2.7g/1cm3

=(2.7/1000)/(1/1000000)

=2.7x1000

Density=2700kg/ m3

= 270000 decagrams/m³

2.

1000g=1kg

1g=1/1000kg

1cm3= ? m3

100cm=1m

1cm=1/100 m

1cm3=1/1000000 m3

Answer:

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Answer:

O2 has a double covalent bond

H2 has a single covalent bond

N2 has a triple covalent bond

Explanation:

Hydrogen atoms form only one covalent bond because they have only one valence electron to pair.

Since two electrons form each bond, there are a total of two pairs, or four electrons, in the bond.

The N2 Lewis structure has a triple bond between two nitrogen atoms. According to the octet rule, nitrogen atoms need to bond three times.

It would take approximately 41960 seconds, or about 11.66 hours, to plate 0.904 g of nickel onto copper using a 2.0 V power supply with a 690 mA current flow and 0.50 M nickel (II) acetate solution, assuming 100% current efficiency.

The process of electroplating involves the deposition of a metal onto a conductive surface by means of an electric current. The amount of metal deposited is proportional to the amount of charge passed through the circuit. The relationship between the amount of metal deposited, the current, and the time is given by Faraday's law:

mass of metal = (current × time × atomic weight of metal) / (96500 × charge of metal)

where atomic weight of metal and charge of metal are in grams per mole and coulombs per mole, respectively. In this problem, we want to calculate the time required to deposit 0.904 g of nickel onto copper using a 2.0 V power supply with a 690 mA current flow and 0.50 M nickel (II) acetate solution, assuming 100% current efficiency.

The atomic weight of nickel is 58.69 g/mol, and the charge of nickel (II) ion is 2+. Therefore, the charge of one mole of nickel (II) ion is:

2 × 1.602 × \(10^{-19}\) C × Avogadro's number ≈ 96485 C/mol

We can use this value and the given current to calculate the amount of nickel deposited per second as:

mass of nickel deposited per second = (current × atomic weight of nickel) / (96500 × charge of nickel)

mass of nickel deposited per second = (0.690 A × 58.69 g/mol) / (96500 × 2 × 1.602 × \(10^{-19}\) C × Avogadro's number)

mass of nickel deposited per second ≈ 4.31 × 10^-10 g/s

To deposit 0.904 g of nickel, we need to pass a total charge of:

(charge of nickel) × (mass of nickel deposited) / (atomic weight of nickel) = 2 × (0.904 g) / (58.69 g/mol) × (96500 C/mol) ≈ 28940 C

The time required to pass this amount of charge can be calculated as:

time = (charge) / (current)

time = 28940 C / 0.690 A ≈ 41960 s

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There are only two stereoisomers of 3-chloro-2-methylbutane: (R)-3-chloro-2-methylbutane and (S)-3-chloro-2-methylbutane.

The given compound, (CH3)2CHCHClCH3, is a chiral molecule because it has a stereogenic center (the carbon atom bonded to four different groups). Therefore, it can exist in two stereoisomeric forms: the enantiomer that is the mirror image of the molecule and the original molecule itself.

To determine if there are any additional stereoisomers, we can examine whether there are any other stereogenic centers in the molecule.

However, we can see that there are no other carbon atoms with four different groups bonded to them. Therefore, there are only two stereoisomers of 3-chloro-2-methylbutane: (R)-3-chloro-2-methylbutane and (S)-3-chloro-2-methylbutane.

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Answer:

B Genes determine specific traits while the chromosomes contain these genes

Answer: A

Explanation: Bob Marshall

The correct answer is A. The conservationist credited with founding the Wilderness Society is Bob Marshall.

Bob Marshall was an American forester, botanist, traveler, climber, writer and social activist who advocated the preservation of unspoiled wildlife.

He actively contributed to the development and adoption of environmental regulations prohibiting the construction of roads in vast federal specially protected natural areas. In 1935 he became one of the founders of the public environmental organization The Wilderness Society and its main sponsor.  

Today Bob Marshall is considered one of the main initiators of the wildlife movement in the United States. Several geographic features are named after him, including the Bob Marshall Wilderness Nature Reserve in Montana and the Marshall Mountain on the Adirondack Ridge.

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Answer:

there are about 26.67 milligrams in 10 mL.

Explanation:

To find the number of milligrams in 10 mL, you can use the proportion:

(8 mg) / (3 mL) = (x mg) / (10 mL)

Where x is the number of milligrams in 10 mL. To solve for x, you can cross-multiply and divide:

(8 mg) * (10 mL) = (3 mL) * (x mg)

x = (8 mg) * (10 mL) / (3 mL)

x = 26.666.. mg

\(\\ \sf\longmapsto C_3H_8+O_2\longrightarrow 4H_2O+3CO_2\)

Answer:

Because electronegativity of Oxygen is higher than electronegativity of Carbon.

Explanation:

The electrons in a bond between carbon and oxygen, C-O, closer to the oxygen atom than the carbon atom because electronegativity of Oxygen is higher than electronegativity of Carbon.

Answer:

The value for the equilibrium constant for the reaction \(2SO2(g)+O2(g) <=> 2SO3(g) Kc=4.0*10^24\\\) at 298K .

What would be the value for the equilibrium constant for the following reaction at the same temperature?

\(2SO3(g) <=> 2SO2(g)+O2(g)\)

Explanation:

The Kc value for the reverse reaction of the first reaction that is:

\(2SO2(g)+O2(g) <=> 2SO3(g) Kc=4.0*10^{24}\\\)

\(Kc=\frac{SO3^{2} }{SO2^{2}.O2 }\)

For the reverse reaction,

\(2SO3(g) <=> 2SO2(g)+O2(g)\)

\(Kc=\frac{SO2^{2}O2 }{SO3^{2}. }\)

So, it is the inverse of the first Kc value.

Hence, the new Kc value is:

\(Kc=\frac{1}{4.0*10^{24} } \\ =2.5*10^{-25}\)

Answer is :

Kc=2.5*10^-25.

Answer:

0.1

Explanation:

Based on the given statements, Student 1 employs correct scientific reasoning.

Based on the given statements, Student 1 employs correct scientific reasoning by explaining a possible source of error in terms of the physical properties of the system. They suggest that if the spot was placed below the solvent level, the sample would be dissolved into the solvent pool before it could travel up the plate, leading to inaccurate results. This is a valid explanation based on the principles of chromatography and the physical behavior of the sample and solvent.

Student 2 also provides a valid explanation based on the principle of polarity, but they do not specify how this might lead to unequal movement of the sample on the TLC plate.

Student 3's statement, on the other hand, does not provide a clear explanation of how closing the developing chamber too quickly might affect the outcome of the lab, and it does not demonstrate a clear understanding of the scientific principles involved.

Therefore, based on the given statements, Student 1 employs correct scientific reasoning.

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Answer:

Explanation:

It is density.

I do hope I helped you! :)

The order Francium, Barium, Arsenic, Bromine is ordered from lowest to highest first ionization energy as per their individual ionization energies.

Across the periodic table, the first ionization energy fluctuates in a predictable manner. In groups, the ionization energy drops while rising from left to right during the course of a period.

Helium on the periodic table thus has the highest first ionization energy, whereas francium has one of the lowest.

Alkali metals have the lowest initial ionization energies because when one electron’s outermost shell is removed, they acquire a stable configuration.

Due to its desire to absorb electrons and lack of tendency to lose them from its valence, fluorine has the highest initial ionization energy.

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Answer:

B.The cake rises as gas bubbles form in the baking cake preferably carbon dioxide

Answer:

The answer is D. -0.59V

Explanation:

Answer:

-.59v

Explanation:

Answer:

1.5 mol H2O

Explanation:

Limiting reactant was C2H6 - 0.5 moles

Fomula became .5C2H6 + 1.75O2 = 1CO2 + 1.5H2O

The units for both the area covered with liquid and the total surface area of the planet are the same before performing.

To determine the percentage of the planet's surface covered with liquid, you need to follow these steps:

Step 1: Determine the total surface area of the planet.

Find the radius (or diameter) of the planet. Let's say the radius is given as "r" units.

Calculate the surface area of a sphere using the formula: A = 4πr². This gives you the total surface area of the planet.

Step 2: Determine the surface area covered with liquid.

Estimate or obtain the area covered by liquid on the planet. Let's say this area is given as "A_liquid" units².

Step 3: Calculate the percentage of the planet's surface covered with liquid.

Divide the area covered with liquid (A_liquid) by the total surface area of the planet.

Multiply the result by 100 to get the percentage.

Mathematically, the calculation can be represented as:

Percentage = (A_liquid / Total surface area) x 100

Ensure that the units for both the area covered with liquid and the total surface area of the planet are the same before performing the calculation.

Remember to substitute the given values into the formula to obtain the final percentage of the planet's surface covered with liquid.

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Z is the solvent, Y is soluble in water while X is insoluble in water.

Filtration is a method of separation of substances based on particle size. Only a particular particle size can pass through the filter. The substance that remains in the filter is the residue while the substances that passes through the filter is called the filtrate.

From the observation in the question Z is the solvent, Y is soluble in water while X is insoluble in water.

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Answer:

System

Explanation:

I got 100 on Edge

A system is a group of related objects which interact with each other and form a complex whole.

A system can be described as a group of interacting elements that act according to a set of rules to create a unified whole. A system is surrounded by its environment and is described by its boundaries, structure, and purpose.

A system in physics can be described as a collection of objects that can be identified. A system refers to a collection that makes thinking about a problem more convenient.

The surrounding is everything else that is not included in the system. An isolated system is a system in which no energy or matter is exchanged with the surroundings.

A closed system is one in which only energy can be exchanged with the surroundings. The open system is one in which both matter and energy can be exchanged with the surroundings.

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Chemicals are not supposed to be poured down the drain.

Chemicals should not be poured down the drain. This can cause harm to the plumbing system, sewage treatment plants, and the environment. Dispose of household chemicals properly by taking them to a designated recycling center or household hazardous waste collection event.

Thus the action that have been undertaken by Thomas and Trenton  is quite wrong since the chemicals that they have poured down the drain could lead to an environmental hazard.

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Answer:

Nothing can change because energy can't be made or destroyed

Explanation:

The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

The empirical formula of the compound C₄₀H₅₆ is C₅H₇.

The empirical formula of a compound is the formula of a compound that shows the simplest ratio in which the elements in the compound are combined.

The molecular formulae of compounds are usually multiples of the empirical formulae of the compounds. However, for some compounds, the empirical formula and the molecular formula are the same.

The empirical formula of the compound C₄₀H₅₆ is obtained by dividing with the highest common factor of the ratios which 8.

Empirical formula = C₄₀H₅₆ / 8

Empirical formula = C₅H₇

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The answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.

The formula for copper(II) phosphate is Cu3(PO4)2.

To find the number of moles of copper ions in 20 moles of copper (II) phosphate, we must first find the number of moles of copper in one mole of copper (II) phosphate.

We have 3 moles of copper in one mole of copper (II) phosphate.

Therefore, we have:3 x 20 = 60 moles of copper ions

To find the number of moles of oxygen atoms in 20 moles of copper (II) phosphate, we first need to find the total number of oxygen atoms in 20 moles of copper (II) phosphate.

In one mole of copper (II) phosphate, there are 8 oxygen atoms (2 from each phosphate ion).

We have:8 x 20 = 160 oxygen atoms.

So, the answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.

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The water table is defined as: Option b) Upper surface of the groundwater

The water table is an underground line separating the soil's surface from the region where groundwater seeps into rock crevices and voids between sediments. At this limit, the water pressure and atmospheric pressure are equal.

The unsaturated zone is the portion of the soil surface above the water table where water and oxygen coexist in the gaps between the sediments. Because there is oxygen in the soil, the unsaturated zone is also known as the zone of aeration. The saturated zone, when water completely fills the crevices between the sediments, is located beneath the water table. Impenetrable rock surrounds the saturated zone at its base.

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The mass of zinc nitrate in the reaction flask can be calculated by multiplying the volume of the solution by its molarity and the molar mass of zinc nitrate. The chemist has 55.81 grams of zinc nitrate in the flask.

First, we need to convert the volume from milliliters to liters:

110.0 mL = 110.0 mL * (1 L / 1000 mL) = 0.110 L

Next, we can calculate the moles of zinc nitrate in the solution:

Moles of Zn(NO3)2 = Volume (L) * Molarity (mol/L)

Moles of Zn(NO3)2 = 0.110 L * 2.68 mol/L = 0.2948 mol

Finally, we can determine the mass of zinc nitrate using its molar mass:

Mass of Zn(NO3)2 = Moles * Molar mass

Mass of Zn(NO3)2 = 0.2948 mol * 189.36 g/mol = 55.81 g

Therefore, the chemist has 55.81 grams of zinc nitrate in the flask.


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