Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.

Answer:

10.5 g

Explanation:

mass= vol × density

m= (1.5×2×5) × 0.7 g/mL

m= 15 × 0.7 g/mL

m= 10.5 g

i hope its correct^^!

Sample methane gas of contains more hydrogen atoms at STP.

At STP a 22.4 liter sample of gas contains the same number of molecules as one mole.

At standard temperature and pressure 1 mol of gas occupied 22.4 liters.

Vm = 22.4 L/mol; molar volume at STP (Standard Temperature and Pressure).

V(CH4) = 1 L; volume of methane gas

n(CH4) = V(CH4) ÷ Vm.

n(CH4) = 1 L ÷ 22.4 L/mol.

n(CH4) = 0.045 mol; amount of methane

In one methane molecule, there are four hydrogen atoms.

n(H) = 4 × 0.045 mol

n(H) = 0.18 mol; amount of hydrogen atoms in 1 liter of methane

n(H2) = 1 L ÷ 22.4 L/mol.

n(H2) = 0.045 mol; amount of hydrogen molecule

In one hydrogen molecule, there are two hydrogen atoms.

n(H) = 2 × 0.045 mol

n(H) = 0.090 mol; amount of hydrogen in 1 liter of hydrogen gas

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It is the name given to the combination of strong and weak nuclear forces.

We know that the nucleus of the atom is the place that houses the greatest amount of energy. We could obtain the highest energy by ripping open the nucleus of an atom. There is a huge energy that holds the particles in the nucleus together and this called the nuclear binding energy.

This energy must also be required to break the nucleus as is the case in the operation of the atomic bond and in nuclear reactors. The true statement about the nuclear energy is that; It is the name given to the combination of strong and weak nuclear forces.

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The number of seconds in a 40-hour work week can be  c. 40 h x

You work a regular 40-hour workweek (eight hours a day).

That persisted up until 1926, when Henry Ford let his workers off the hook for one day of obligatory labour. Eight-hour days and six-day weeks totaled 48 hours of labour each week for Ford employees. The 40-hour workweek, as it is currently known, was created by eliminating one day and replacing it with five days of eight-hour shifts.

Four nine-hour days followed by an eight-hour Friday is the most typical pattern for doing this. The next week consists of four nine-hour days and a Friday off.

A full-time employee is one who works an average of at least 30 hours per week for the duration of a calendar month in order to qualify under the employer shared responsibility laws.

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Answer:

the answer is student 2

Explanation:

the student 2 has the right answer because student 1 is wrong

Atom X possesses eight more electrons than atom Y. Student 1 claims they are in the same class. Student 2 claims to be non-reactive. Students 1 and 2 are both correct.

Therefore,

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No chemical reaction occurs on combination of sodium sulfate and iron (III) nitrate.

This chemical reaction does not occur since none of the products are solids, insoluble gases, or water. Just aqueous iron (III), sodium, nitrate and sulfate ions are present.

Thus, iron (III) nitrate and sodium sulfate do not interact.

One or more substances, known as reactants, are changed into one or more new substances, known as products, during a chemical reaction. Substances are made up of chemical components or chemical elements. The atoms that constitute the reactants of a chemical reaction are rearranged to create different products.

Combustion, decomposition, neutralization, redox, precipitation or double-displacement, and synthesis are some of the numerous types of chemical reactions that can occur depending on the product that is produced.

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When water molecules interact, the positively charged hydrogen end of one molecule is attracted to the negatively charged oxygen end of another molecule.

Hydrogen bonding is a type of dipole-dipole attraction between molecules, it was not all the time that a covalent bond to a hydrogen atom.

The attractive force will be very strong between a hydrogen atom and the electronegative atoms i.e., N, O, or F atom, etc., as it was covalently bonded to electronegative atom.

Any molecule that has a hydrogen atom directly attached to an oxygen or nitrogen atom is capable of hydrogen bonding. When hydrogen is bonded to fluorine, the attraction of covalent bond was very well.

So, When water molecules interact, the positively charged hydrogen end of one molecule is attracted to the negatively charged oxygen end of another molecule.

Thus, the answer is positively and negatively respectively.

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The empirical formula of the compound is [tex]CH_{4}N[/tex].

We calculate the empirical formula by calculating the mass of every individual element in the compound and then calculating the corresponding moles.

0.458 g CO2 / 44 g/mol = 0.0104 mol ⇒ 0.0104 mol of C ⇒ 0.0104 mol x 12 g/mol = 0.125 g of C

0.374 g H2O / 18 g/mol = 0.0208 mol ⇒ 0.0416 mol of H ⇒ 0.0416 mol x 1 g/mol = 0.0416 g of H

0.486 g : 0.226 g = 0.312 g : X

X = 0.145 g of N

0.145 g / 14 g/mol = 0.0104 mol of N

0.0104 mol of C
0.0416 mol of H
0.0104 mol of N

When divided by 0.0104 mol, we get the C : H : N ratio of 1 : 4 : 1, giving us the empirical formula of [tex]CH_{4}N[/tex].

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The solubility of barium carbonate, BaCo₃ is 4.5 x 10⁻⁵ M.

To find the solubility, the given values are,

Ksp = 2.0·10⁻⁹.

Here, s(BaCO₃) = ?M.

In chemistry, Solubility is the ability of a substance, the solute, to form a solution with another substance, the solvent.

Formula for solubility is,

                           Ksp = [A^+]^a [B^-]^b

Ksp = solubility product constant

A^+ = cation in an aqueous solution

B^- = anion in an aqueous solution

a, b = relative concentrations of a and b

The Chemical reaction of Barium carbonate is :

BaCO₃(s) → Ba²⁺(aq) + CO₃²⁻(aq).

s(BaCO₃) = s(Ba²⁺) =s(CO₃²⁻) = x.

Ksp = s(Ba²⁺) · s(CO₃²⁻).

Ksp = x · x.

2.0·10⁻⁹ = x².

x = √2.0·10⁻⁹

  = 4.47x10⁻⁵ M.

So, The solubility of Barium carbonate is 4.5x10⁻⁵ M.

Hence, Option D is the correct answer.

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The name of the CO32 polyanion is Carbonate.

It frequently appears in limestone. It is found bonded to metals in groups I and II of the periodic table because it cannot exist on its own. The name of the metal to which the compound is bonded is given first, followed by the word carbonate, as in calcium carbonate, sodium carbonate, and so forth. Calcite, also known as limestone, and dolomite, also known as dolostone, are the two different types of carbonates.

Calcite, aragonite, and dolomite are the three groups of common anhydrous (water-free) carbonates that are separated based on their different structural types. The only notable hydrous types are the copper carbonates azurite and malachite.

Anything with more than one negatively charged anion. Any compound with multiple anion moieties, particularly one that is based on a polymer.

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The new concentration of the solution of HCl diluted to 750 mL is 0.76 M

To solve this problem, the formula and the procedure that we have to use is:

c1 * v1 = c2 * v2

Where:

Information about the problem:

Applying the dissolution of concentrations formula and clearing the concentration of the diluted solution(c2), we get:

c1 * v1 = c2 * v2

6.0 M * 95 mL = c2 * 750 mL

c2 = (6.0 M * 95 mL) / 750 mL

c2 = 0.76 M

In chemistry a dissolution is known as a homogeneous mixture of two or more components called:

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The speed of the fluid in the pipe through the cross-section of 0.105 m² is 5.21 m/s.

The area of the first cross-section is A1.

A1 = 0.70 m²

The area of the second cross-section is A2.

A2 = 0.105 m²

The velocity of the fluid at the first cross-section is V1.

V1 = 3.50 m/s

Let the velocity of the fluid at the second cross-section be V2.

The speed of the fluid in the pipe through the cross-section of 0.105 m² is,

Area of the first cross-section × Velocity of the fluid through the first cross-section = Area of the second cross-section × Velocity of the fluid through the second cross-section

A1 × V1 = A2 × V2

0.070 × 3.50 = 0.047 × V2

[tex]V2 = \frac{0.070 × 3.50}{ 0.047} [/tex]

= 5.21 m/s

Therefore, the speed of the fluid in the pipe through the cross-section of 0.105 m² is 5.21 m/s.

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In Dalton Theory  the atom of the same element has same mass found also wrong because some elements show different atoms having different masses.

That postulate of the Dalton atomic theory was changed that atom is indivisible particle and can be subdivided into smaller particles was later changed and then this statement comes forward that because the atoms can be divided into three more particles which are electron, proton and neutron.

1. The first statement of the Dalton's theory got wrong because due to the indivisibility of the atom.

2. The atom is the smallest particle also found wrong because the atom is further divided in the proton, electron and neutron.

3. The atom of the same element has same mass found also wrong because some elements show different atoms having different masses.

So we can conclude that in Dalton theory  the atom of the same element has same mass found also wrong because some elements show different atoms having different masses.

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11.8 grams of H₂O will be produced.

Balanced chemical equation:

MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O

n(MnO₂) = 0.86 mol; amount of manganese(IV) oxide

m(HCl) = 48.2 g; mass of hydrochloric acid

n(HCl) = 48.2 g ÷ 36.5 g/mol

n(HCl) = 1.32 mol; amount of the acid

From balanced chemical equation: n(MnO₂) : n(HCl) = 1 : 4

Hydrochloric acid is limited reactant.

From balanced equation: n(HCl) : n(H₂O) = 2 : 1

n(H₂O) = 1.32 mol ÷ 2

n(H₂O) = 0.66 mol; amount of the water

m(H₂O) = n(H₂O) × M(H₂O)

m(H₂O) = 0.66 mol × 18 g/mol

m(H₂O) = 11.8 g; mass of the water

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No, the atoms in buta-1,3-diene don't stay on the same plane due to steric repulsion, infract they change and rotate their planes and lie in separate planes.

What is same plane?

Since atoms with a pi bond cannot spin, they will all be in the same plane if they have a double or triple bond. The atoms also lie in the same plane if they are either trigonal or square planar.

Diatomic and triatomic molecules, as well as those that, with the exception of hydrogen, only exhibit sp2 and/or sp hybridization. Trigonal planar molecules (BF3) and typical diatomic molecules (CO2) will both be in the same plane.

The C-H bond twists as a result of sterric repulsion, moving the hydrogen atoms further from the molecular plane (like Ortho effect). However, there would be little to no sterric repulsions in the case of trans 1,3-butadiene, causing all atoms to lay in a single plane.

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The ratio of the deprotonated form to protonated form is 1 : 100.

Henderson–Hasselbalch equation: pH = pKa + log(cs/ck)

pH = 4.75; pH of buffer solution

pKa = 6.75

4.75 = 6.75 + log(cs/ck)

log(cs/ck) = 4.75 - 6.75 = -2.0

cs/ck = 10⁻² = 0.01; ratio of the deprotonated form to protonated form

A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

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Three different atomic cations that have 22 protons-

Atomic cations are atoms that have a positive electric charge.

(Chromium) Cr has 24 protons therefore, Cr2+ has = 24 - 2 ⇒ 22 protons.

(Manganese) Mn has 25 protons therefore, Mn3+ has= 25-3 ⇒ 22 protons.

(Iron) Fe has 26 protons therefore, Fe4+ has= 26-4 ⇒ 22 protons.

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Cr²⁺, Mn³⁺ and Fe ⁴⁺ are the chemical symbols for three atomic cations with 22 electrons.

The number of protons inside the nucleus always remains constant.

∴Chemical symbol of three different atomic cation that have 22 electrons-  

1. Cr²⁺

2.Mn³⁺

3. Fe⁴⁺

Atomic cation is the ion with positive electric charge on it, it means it should have more protons than electrons.

•Chromium (Cr) has 24 electrons therefore, Cr²⁺ will have = 24- 2 ⇒22 electrons (+2 charge means it will lose 1 electron from its outer shell)

•Manganese (Mn) has 25 electrons therefore, Mn³⁺ will have = 25-3⇒ 22 electrons. (+3 charge means it will lose 3 electrons from its outer shell)

•Iron (Fe)  has 26 electrons therefore, Fe⁴⁺ will have = 26-4 ⇒ 22 electrons. (+4 charge means it will lose 3 electrons from its outer shell)

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Your question is incorrect. It should be - Write the chemical symbols for three different atomic cations that all have 22 electrons.

This rule is used to quickly determine protonation, and hence charge state, and is extremely important to know (and easy to derive).

In many stoichiometric and catalytic reactions, protonation—a fundamental chemical reaction—takes place as a first step. Many biological macromolecules, including certain ions and molecules that can undergo more than one protonation, are classified as polybasic. Most acid-base reactions result in protonation and deprotonation (the removal of a proton), which are at the center of most theories relating to these reactions.

An element that protonates another element is referred to as a Brnsted-Lowry acid. In some analytical processes, such as electrospray mass spectrometry, protonation of a substrate is a necessary step since it causes the species' mass and charge to both increase by one unit. In addition to changing the charge and mass of a molecule or ion, protonation and deprotonation can also alter many other chemical properties.

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The wasteful side reaction of o2 with rubisco takes place under increased temperature and intense light conditions.

In the Calvin cycle, photorespiration refers to the chemical reaction that takes place between enzyme rubisco and oxygen by using ATP under light conditions and increased temperature.

The resultant products of this reaction are phosphoglycolate and PGA.

Moreover, phosphoglycolate and PGA can not be utilized for the synthesis of RUBP instead these newly manufactured compounds are processed into a 3-PGA reaction to continue the Calvin cycle where they are consumed to generate glycolate which is ultimately transformed into glycerate.

To put it simply, photorespiration is a reaction in which oxygen combines with rubisco to form 3-PG and 2 phosphoglycolates.

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Answer:

Structure:

Differences-  A polymer is a collection of a large number of molecules whereas a monomer is a single molecule.

A monomer is a single molecule, which has the ability to chemically bond with other monomers in a long chain. A polymer is a chain that is made when monomers bind with other monomers.

Similarities-  They are both molecules

Properties:

Differences- Monomers have polyfunctionality, which is the capacity to form chemical bonds to at least two other monomer molecules. Polymers are chemically unreactive, solids at room temperature, malleable, tough, and are electrical insulators.

Similarities- They both makeup larger forms of matter.

Intermolecular Forces

Differences: Polymers are held together by covalent bonds, hydrogen bonds, and dispersion bonds. Monomers are only held together by hydrogen bonds.

Similarities: They can both be bonded together by hydrogen bonds.

The substance has a molar mass of 122.11 g/mol, an empirical formula of C2H5O2, and a molecular formula of C4 H10 O4.

We can determine the relative atomic ratios in a compound using an empirical formula.

The ratios also hold true at the molar level. H2O is made up of two hydrogen atoms and one oxygen atom.

The same is true for the mole of H2O, which is made up of 1.0 moles of oxygen and 2.0 moles of hydrogen.

Example: The chemical structure of glucose is C6H12O6. Every mole of carbon and oxygen is accompanied by two moles of hydrogen.

Glucose has the empirical formula CH2O.

Ribose has the chemical formula C5H10O5, which can be simplified to the empirical formula CH2O.

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The expected value of the total volume of the liquuid in the test tube is 23 mL

From the question given above, the following data were obatined:

The total volume of the liquid in the test tube can be obtained by adding the volume of the red liquid and the volume of the liquid in the test tube together. This is illustrated below:

Total volume = Volume of red liquid + volume of liquid in test tube

Total volume = 14 + 9

Total volume = 23 mL

Thus, we can conclude that the expected value of the total volume of the liquid is 23 mL

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For unrestrained cube made from linear, isotropic, homogeneous material the temperature increase causes strain in (6,0) direction(s).

It is well known that for unrestrained cube made from linear, isotropic, homogeneous material the temperature increase causes strain in (6,0) direction(s). This is due to the fact that the cube is free to expand in all directions, and thus, the strain is evenly distributed throughout the cube. However, it is interesting to note that the strain in the (6,0) direction is actually slightly greater than in the other directions. This is because the (6,0) direction is the direction of the temperature gradient, and thus, the strain is greater in this direction.

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The weight of the column is 1273.85 pounds.

r = 370 mm/2 = 185 mm

r = 0.185 m; a radius of a concrete column

l = 2.2 m; a length of a concrete column

d = 2.45 Mg/m³; density of a concrete

V = r² × π × l

V = (0.185 m)² × 3.14 × 2.2 m

V = 0.236 m³; volume of a column

m = d × V

m = 2.45 Mg/m³ × 0.236 m³

m = 0.578 Mg

1 Mg = 1000 kg

m = 578.2 kg; mass of concrete

W = 578.2 kg × 9.8 m/s²

W = 5666.36 N

W = 5666.36 N × 0.225 Ibf/N

W = 1273.85 Ibf; weight of a concrete

The weight of an object is the amount of force acting on the object due to gravity. SI unit for weight is newton (N).

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C₁₂H₁₂BrO₁N₁ is the molecular formula.

An analytical technique used to measure the mass to charge ratio of the ions is known as mass spectrometry. This is one of the best technique used to analyse the structure of a molecule.  It is used in a a lot of applications such as carbon dating, food contamination detection, isotope detection, protein identification etc.

We have given that,

molecular ion at 265 m/z

another ion seen at 267 m/z

their ratio is 1:1

C₁₃H₉Cl₂ON₁ in this in here Cl have two isotopes that are

36 and 37 but   m/z is not equal to 265

in here C₁₂H₁₂BrO₁N₁  Br have  two isotopes

Br-79,  Br-81 and  m/z equals to 256 and 257

so the molecular formula is therefore  C₁₂H₁₂BrO₁N₁

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your question is incomplete, below you will find the missing content

here the options are not given, so options are

a. C₁₃H₉Cl₂ON₁ b. no isotopic atom  c. C₁₂H₁₂BrO₁N₁

The ph of the resulting solution Ka = 1.8x10-5 /0.036-x

The e letters pH stand for the potential of hydrogen since pH is effectively a measure of the concentration of hydrogen ions.

a solution is a special type of homogeneous mixture composed of two or more substances.

3 ml x 3.00 M = 250 ml * x M

x = 0.036 M HAc

Ka = 1.8x10-5 /0.036-x

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The molecular formula of a compound with the empirical formula [tex]C_{3}H_{7}[/tex]and a molar mass of 215.50 g/mol is [tex]C_{15}H_{35}[/tex].

A substance's molecular formula describes the kind and number of atoms of each element present in a molecular compound. The empirical formula and the molecular formula are typically the same. The empirical formula for methane is [tex]CH_{4}[/tex] because it only contains one carbon atom, which is also its molecular formula.

The molecular formula is the most useful when you want to know how many atoms of each element are present in the molecule. Since it offers more details than the empirical formula, it is more common. The importance of the molecular formula increases while working with organic chemistry.

The formula for the molecular formula is the molar mass/ empirical formula

So, the empirical formula of [tex]C_{3}H_{7}[/tex]=  C × 3 + H × 7

[tex]C_{3}H_{7}[/tex] = 12×3 + 1 × 7

[tex]C_{3}H_{7}[/tex] = 43

Then use the molecular formula = 215.50 / 43 = 5.01

Therefore, the molecular formula is 5 times the empirical formula which is [tex]C_{15}H_{35}[/tex].

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1 molecule of glutamate can form 7.6 ATP can be formed by oxidative phosphorylation .

In the process of oxidative phosphorylation, oxygen is consumed as electrons are transferred through the mitochondrial electron transport chain and ATP is produced.

The bulk of the ATP required for higher animals and plants to sustain life is produced by oxidative phosphorylation, which is also in charge of creating and preserving metabolic equilibrium.

The glutamate carrier recycles glutamate outside of mitochondria (T9). One aspartate and 7.6 ATP are made at the best return for each glutamine.

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