what combination of ester and bromo-grignard reagent could you use to prepare the following tertiary alcohol? (select) draw structure ... bromo-grignard reagent

Answer:

14.43 moles

Explanation:

I don't know... the interwebz said soz

an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as Hyperconjugation.

The delocalization of the sigma electrons in the C-H bond of an alkyl group coupled to an atom in an unsaturated system or to an atom with an unshared p orbital is known as hyperconjugation, which is a general stabilizing interaction. When a suitable attacking reagent is present in an organic molecule, electron displacement happens.

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Explanation:

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The volume of nitric acid needed to titrate calcium hydroxide is 100.0 mL.

The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂)

2 HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2 H₂O

Calculate the number of moles Ca(OH)₂

n = MV

n Ca(OH)₂ = MV = 0.01000 × 125.0 = 1.25 mmol

According to Avogadro's law, the ratio of the coefficients of each element is equal to the ratio of the number of moles.

n Ca(OH)₂ : n HNO₃ = 1 : 2

1.25 : n HNO₃ = 1 : 2

n HNO₃ = 1.25 × 2 = 2.50 mmol

Calculate the volume of HNO₃

V = n ÷ M

V = 2.50 mmol ÷ 0.02500 M

V = 100.0 mL

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The percent yield of iron is, 86.5 %

Given,

Moles of iron(III)oxide = 0.450 mole

Mass of iron = Actual yield of Fe = 43.6 g

First we have to calculate the moles of iron.

The balanced chemical reaction is,

2Al+ 2 Fe₂O₃ --> 2Fe + Al₂O₃

From the balanced reaction we conclude that

As, 1 mole of Fe₂O₃ react to give 2 mole of Fe

So, 0.450 mole of Fe₂O₃ react to give 2/1 x 0.450 = 0.9 moles of Fe

Now we have to calculate the mass of Fe.

Mass of Fe = Moles of Fe x Molar mass of Fe

Mass of Fe = (0.9mole) x (56g/mole)= 50.4g

Therefore, the mass iron produces, 50.4 g

Now we have to calculate the percent yield of Fe.

% yield of Fe = (Actual yield of Fe/ Theoretical yield of Fe) x 100%

                     = 43.6g/50.6g x 100% = 86.5%

Therefore, the percent yield of Fe is, 86.5 %

The question whose answer is given:

If 0.450 moles of iron III oxide (Fe2O3) are allowed to react with an excess of aluminum (Al) and 43.6 grams of iron (Fe) is produced, what is the percent yield of iron?

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The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.

Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )

On converting the kinetic energy to atomic mass we get:

4.01 MeV/931.5 MeV/u = 0.0043048 u

The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.

Therefore,

The remaining mass = 238.050783 - (4.002602 + 0.0043048)

= 234.0438762 u

The remaining mass = 234.04u

Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.

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The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.

Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )

On converting the kinetic energy to atomic mass we get:

4.01 MeV/931.5 MeV/u = 0.0043048 u

The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.

Therefore,

The remaining mass = 238.050783 - (4.002602 + 0.0043048)

= 234.0438762 u

The remaining mass = 234.04u

Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.

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A plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.

Subduction is defined as a process through which, at convergent borders, the oceanic lithosphere is recycled into the Earth's mantle. Subduction happens when one plate is driven beneath the other and back into the Earth's interior when two plates collide at a convergent boundary.

An object is drawn into the mantle by convection currents. Due to gravitational attraction, one plate slides under another. When an oceanic plate collides with a continental plate and slides beneath it, subduction occurs. When two oceanic plates or a plate bearing continents contact, one plate will bend and slide under the other.

Thus, a plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.

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Answer: b. A plate slides beneath another plate due to convection currents and gravity. 

Explanation:

The name is copper bromide.

Explanation:

copper bromide is the aswer

Answer: B

Explanation:

Answer:SO2 dissolves in water and forms dipole-dipole attractions with the water molecules.

Explanation:

i got it right

The statement best describes what occurs when a polar molecule like so2 is mixed with water is so2 dissolves in water and forms dipole-dipole attractions with the water molecules. Therefore, option B is correct.

A polar molecule is one that has a slight positive charge on one end and a slight negative charge on the other. A polar molecule is a diatomic compound, such as HF, that contains a polar covalent link.

The molecule's form is to blame for this. Polar molecules include those in water. Inside the molecule, there are two polar bonds. The twisted, non-symmetrical structure of the molecule results in its polar nature (it has a and side).

A water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole due to the unequal sharing of electrons between the atoms and the asymmetrical form of the molecule (side).

Thus, option B is correct.

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IUPAC name for Rust is Iron (III) Oxide. Its common name is corrosion mostly seen in iron or steel.

Rust is the common name for iron oxide. The most familiar form of rust is the reddish coating that forms flakes on iron and steel (Fe2O3) but rust also comes in other colors including yellow, brown, orange, and even green. The different colors reflect various chemical compositions of rust. Rust specifically refers to oxides on iron or iron alloys such as steel. There is tarnish on silver and verdigris on copper. The chemical name of rust is iron oxide is iron (III) oxide. The familiar red form of rust is Fe2O3. but iron has other oxidation states, so it can form other colors of rust. Rust forms when iron or its alloys are exposed to moist air. The oxygen and water in air react with the metal to form the hydrated oxide.

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The absorptions would you expect to observe in the ¹³C NMR spectra of the  molecules a)  2-Methyl-2-butene is 5 signals

b) trans-1,3-Dimethylcyclohexan is 8 signals.

The proton which have equivalent chemical environment will gives one signal in ¹³C NMR. the ¹³C NMR signals will tell us about the number of different set of carbon which is in equivalent environment.

a)  2-Methyl-2-butene - in this compound there are 5 carbon atoms present . all the 5 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 5 signals.

b) trans-1,3-Dimethylcyclohexan -  in this compound there are 5 carbon atoms present . all the 8 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 8 signals.

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A matter is made up of Tiny particles which contain mass, and are too small to be seen. Option B is the correct answer.

A matter consists of atoms and consist of protons, neutrons, and electrons. Both the protons and neutrons are placed in the nucleus, which is the center of an atom.

Matter can occupy space and has mass, and matter consists of many phases and it can take different forms. The matter is generally in the form of a solid, liquid, or gas.

The matter is also made up of tiny particles called atoms!

There are three main states of matter They are, solid, liquid, and gas. Water is one of the substances that exist in all three states.

1. SOLID:

Examples of solids are: metals, wood

2. LIQUID:

Examples of liquids: are water and oil.

3. GAS:

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The time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h is 4.8 hours

We know that speed is defined as the distance travelled per time as shown below:

Speed = Distance / time

With the above formula, we can determine the time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h. Details below:

Speed = Distance / time

5.6 = 25 / time

Cross multiply

5.6 × time = 25

Divide both sides by 5.2

Time = 25 / 5.2

Time = 4.8 hours

This, the time taken is 4.8 hours

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The limiting reagent in the process is carbon dioxide, and the theoretical yield is 360 g.

Moles = given mass divided by molecular mass (1)

For LiOH:

LiOH has a mass of 1.00 103 g.

LiOH has a molar mass of 23.95 g/mol.

Equation 1 is solved with the following values: Moles of LiOH = 1.00103g/23.95g/mole=41.75mole

For carbon dioxide: Given mass of carbon dioxide = 8.8×10²g

Carbon dioxide has a molecular mass of 44 g/mol.

Equation 1 is solved with the following values: Moles of carbon dioxide = 8.8 102 g/44 g/mole = 20 moles.

The following is the chemical formula for the reaction between carbon dioxide gas and lithium hydroxide:

2LiOH(s)+Co2(g)⇒Li₂Co₃(s)+H²O(l)

Using the reaction's stoichiometry:

2 moles of lithium hydroxide and 1 mole of carbon dioxide react.

Thus, the reaction between 20 moles of carbon dioxide.

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The product of this reaction is calcium chloride (CaCl2) and hydrogen gas (H2).

For this reaction, we have single displacement reaction.

What is a single displacement reaction?

A single displacement reaction is a type of chemical reaction in which one element exchanges its place with another element in a compound. This type of reaction is also known as a single replacement reaction or a substitution reaction. In a single displacement reaction, the elements involved must be different. Examples of single displacement reactions include the reaction between magnesium and hydrochloric acid to produce magnesium chloride and hydrogen gas, and the reaction between zinc and sulfuric acid to produce zinc sulfate and hydrogen gas.

In this reaction, Calcium (Ca) metal is seen reacting with Hydrochloric acid (HCl). The Ca replaces the H in HCl and we end up with CaCl2 and H2.

The resulting reaction is CaCl2 + H2.

The complete reaction is:

Ca + 2HCl ---> CaCl2 + H2

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.98grams are present in  45.73 moles of  BCl[tex]_3[/tex].

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

Mathematically,

number of moles of  BCl[tex]_3[/tex] =given mass of BCl[tex]_3[/tex] ÷ molar mass of BCl[tex]_3[/tex]

Molar mass of 1 mole of BCl[tex]_3[/tex] = 46.264 g/mol

number of moles of  BCl[tex]_3[/tex] = 45.73 moles

Substituting all the given values in the above equation, we get

45.73 moles =mass of BCl[tex]_3[/tex]÷46.264 g/mol

mass of BCl[tex]_3[/tex]   =0.98grams

Therefore, 0.98grams are present in  45.73 moles of  BCl[tex]_3[/tex].

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Answer:

2Mg (s) + O² (g) --> 2MgO (s)

Explanation:

the product is magnesium oxide

The percent yield of the magnesium oxide in this context is 87.3%.

We know that the percentage yield has to do with the amount of the product that we get from the reaction expressed as a percentage. We know that the combination of the magnesium and the oxygen molecule would lead to the formation of the magnesium oxide.

The oxygen and the magnesium are the reactants while the magnesium oxide is the product.

Mass of magnesium = Mass of magnesium and crucible - mass of crucible

= 38.06 g - 35.67 g

= 2.39 g

Number of moles of Mg =  2.39 g/24 g/mol

= 0.0996 moles

Mass of magnesium oxide =  Mass of magnesium oxide and crucible - mass of crucible

= 39.15 g - 35.67 g

= 3.48 g

Number of moles of the magnesium oxide = 3.48 g/40 g/mol

= 0.087 moles

From the reaction;

2 moles of Mg produces 2 moles of MgO

Hence the theoretical yield of the Mgo is 0.0996 moles

Percent yield = Actual yield/ Theoretical yield * 100/1

= 0.087 moles/ 0.0996 moles * 100/1

= 87.3%

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7.35 KJ energy is gives off when 1.00 g Fe is reacted with excess oxygen according to the reaction.

The reaction between Fe and O is as below :

4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(g)

here , Δ H =  - 1652 KJ

The enthalpy change is -1658 KJ. It means the reaction gives off 1652 heat or energy.

Heat released when 1.00g of is reacted with excessive oxygen:

Moles of Iron (Fe) = [tex]\frac{1g}{56g/mol}[/tex] = 0.0178 mol

According to reaction, When 4 moles of an Iron (Fe) reacts with 3 moles of Oxygen (O) it gives 1652 Kilo Joules of Energy.

Then 0.0178 Moles of Iron (Fe) will give :

∴ [tex]\frac{1652 KJ}{4}[/tex] × 0.0178 = 7.35 KJ

So, 1.00 g of Fe reacts with an excess of oxygen to release 7.35 KJ of energy.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Composite materials are made from Concrete and steel. A composite material is made up of two or more constituent materials whose properties are very dissimilar from each other.

Therefore, the correct option is option A.

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The energy released by the phase change of a substance  can be calculated using calorimetric equation. The energy released during conversion D from gas to solid at the specified condition is 496.58 kJ.

Calorimetry is an analytical tool used to determine the heat energy released or absorbed by a chemical or physical change. The calorimetric equation connecting the heat energy q with mass of the substance m, specific heat c and the temperature difference ΔT is written as:

q = m c ΔT .

Specific heat of the gas= 0.5 J/ g ° C

mass m = 360.5 g

temperature difference = (184 -(-91)) =275°C.

heat released q = 360.5 g × 275°C ×   0.5 J/ g ° C

                           =  49658.87J

                           = 496.5 kJ

Therefore, the heat energy released from the given phase change is 496.5 kJ.

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Answer:

The punching bag exerts a force of 1300 Newtons on the boxer.

Explanation:

The punching bag exerts 1300 Newtons on the boxer because Newton's third law says that "every action has an equal and opposite reaction" which means that for example, as the boxer punches the punching bag, the boxer exerts a force of 1300 Newtons to the right. The punching bag at the same time exerts a force of 1300 Newtons to the left against the boxer. So "every action" would be the boxer pushing on (punching) the bag and the bag moving (for example) to the right, away from the boxer, "equal and opposite reaction" would be the punching bag pushing against the boxer (during contact) and moving to the left, which is cause for the back and forth movement of the bag after contact with the boxer.

(Sorry for the long-winded explanation, hope this helps!)

Internal energy of the system is 1278 kJ.

What is Internal Energy?

It refers to the intangible microscopic energy at the atomic and molecular scales, which is distinct in scale from the macroscopic organised energy associated with moving objects. For instance, a glass of water on a table at room temperature appears to have no apparent energy, either potential or kinetic.

∆U = w + q

U = modification of internal energy =?

W = work equals +425 kcal (positive sign because work is done on the system)

lthough I'm not sure you intended to use separate units (kcal and kJ), I'll presume you did so in order to solve the problem. Don't convert them if they should be the same, such as in the case of kJ.

425 kcal plus 4.184 kJ per kcal equals 1778 kJ of labor, or w.

∆U = +1778 + (-500 kJ) (-500 kJ)

∆U = +1278 kJ

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The IUPAC name for C2H5 is ethyl radical.

Ethyl is a Radical formed from Ethane. Ethane is a chemical compound, which is a colorless and odorless gas. It is a non-polar dispersion force.

Ethyl is also known as ethyl alcohol or ethanol. It is a flammable liquid that is toxic. It is used by medical practitioners, mainly in hand sanitizers.

Ethyl is an organic hydrocarbon molecule. IUPAC is an international federation that represents chemistry and its related tools and techniques. It is a part of the International Science Council, and helps in designing various chemical structures, names  and standards.

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Molarity of 125g cobalt chloride dissolved in a final volume of 300ml is 1.75M.

What is molarity?

Molarity is a unit of concentration for a solution, which is the number of moles of a solute per liter of solution. It is denoted by the symbol “M” and is an important concept in chemistry. Molarity is used to quantify the amount of a solute that is present in a solution and can be used to calculate the volume of a solution required to make a solution with a certain molar concentration. Molarity is a key parameter in determining the properties of a solution and is used to solve for the mass or volume of a solute needed to make a solution.

M= no. of moles of solute /volume of solution (in L)

Volume of solution = 300/1000 =0.3 L

Moles of cobalt chloride = 125/237.9 moles

M= 125/ (237.9×0.3) = 1.75 mol L⁻¹ = 1.75M

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The mechanistic intermediate that is used to explain the preference for addition of the Br atom , of Hbr, to the internal carbon of a terminal alkyne is free-radical conditions.

The addition of HBr to an alkyne under free-radical conditions is governed by the addition of a Br atom to the alkyne which helps in giving the most stable alkyl radical possible. The addition of HBr in the absence of radicals is governed by the addition of a proton to the double bond which helps in giving the most stable carbocation possible.

A molecule wherein a carbon atom has a fine fee and three bonds is known as a carbocation. We can basically say that they are carbon cations. Later, it forms into carbonium ion. Any even-electron cation that possesses a big effective charge at the carbon atom is known as an carbocation.

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Volume of solution is used to calculate molarity of a 1 molal sodium chloride solution. The correct option to this question is A.

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Answer:

NA atoms

6.02 × 10²³ atoms

An oxygen tank used in a hospital setting has a pressure of 4.0 atm and contains 60.0% O₂ and 40.0% N₂  by volume. the partial pressure of oxygen in the tank is 2.4 atm

given that :

the total pressure of gas = 4 atm

percent by volume of oxygen = 60.0 % = 0.6

percent by volume of nitrogen = 40 % = 0.4

According to the Dalton's law of partial pressure is given as :

Partial pressure = mole fraction of gas × P total

Partial pressure of O₂  = 0.6 × 4

Partial pressure of O₂ = 2.4 atm

Thus, the partial pressure of the oxygen gas is 2.4 atm.

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