What is the chemical basis of molecular hybridization?
a. base complementarity
b. acid-base equilibrium
c. dependence of migration rate on charge to mass ratio
d. higher energy of covalent bonds

Answer:

False

Explanation:

Substances are of two types: Pure substances and mixtures. Pure substances include elements (made up of single kind of atoms), compounds (atoms of different element in fixed proportion). Substances are of three types: elements, compounds and mixtures.

The process for calculating the molarity of a solution:

1) Calculate the number of moles of solute by multiplying mass of solute and the inverse of molar mass.

2) Calculate the molarity of the solution by multiplying number of moles of solute and the inverse of solution volume.

n(NaNO₂) = m(NaNO₂) × 1/M(NaNO₂); multiplying mass of solute and the inverse of molar mass.

n(NaNO₂) = 4.8 g ÷ 69 g/mol

n(NaNO₂) = 0.0695 mol; the number of moles of solute

c(NaNO₂) = n(NaNO₂) × 1/V(NaNO₂);

c(NaNO₂) = 0.0695 mol ÷ 0.150 l

c(NaNO₂) = 0.463 mol/l; the molarity of the solution

Missing options:

1) Calculate the number of moles of solute by multiplying number moles of solute/mass of solute and molar mass/the inverse of molar mass.

2) Calculate the molarity of the solution by multiplying molarity of solute/number of moles of solute and solution volume/the inverse of solution volume.

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The true statement about mixtures is that they do not have specific compositions (option B).

Mixture is a substance made up of two or more chemical components that are not chemically linked.

This further means that the constituents of a mixture maintain or keep their individual chemical identities because there is no breaking of bonds.

As opposed to mixtures, compounds are made up of constituents that are chemically bonded to one another, hence, possess a definite composition.

Examples of mixtures are as follows:

Therefore, the true statement about mixtures is that they do not have specific compositions.

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At 30°C, Molar enthalpy will be 72,446.4 J/mole and total enthalpy will be 26.5 kJ.

At 50°C, Molar enthalpy will be 3,63,792J/mole and total enthalpy will be 132.5 kJ.

The enthalpy value per mole is known as molecular enthalpy. Enthalpy is a thermodynamic quantity that, according to this definition, is equivalent to a system's entire heat capacity. It is equal to the sum of the system's internal energy and the volume times pressure product. KJ/mol serves as the unit of measurement for this value. As a result, we can arrive at the following equation to determine molar enthalpy:

DH/n = Molar Enthalpy n is the number of moles of reactant used in the system, and DH is the change in enthalpy of the system. For instance, the change in enthalpy when one mole of a chemical species is created in the standard state at a certain temperature is known as the molar enthalpy for the creation of a specific substance.

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Answer: created, destroyed, element, product

Explanation: The law of conservation of mass states that matter can neither be created nor destroyed but is transferred from one form to another. In other words, the mass of one element at the beginning of the reaction must be equal to the mass of the element at the end of the reaction.
So...the law of conservation of mass states that during a chemical reaction, mass/matter is not CREATED or DESTROYED and because of this law, there must be exactly the same number and kind of ELEMENTS on each side of a chemical equation.
To check if an equation is balanced or not, simply count the number of atoms of each element on the reactant side of the equation and check to see if there are the same number of atoms of each element on the PRODUCT side of the equation. If so, it is balanced.

Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

What are ethers?

Any organic compound in the family known as ethers has an oxygen atom bound to two alkyl or aryl groups. Ethers and alcohols share structural similarities, and water shares structural similarities with both ethers and alcohols. While both hydrogen atoms are replaced by alkyl or aryl groups in an ether, just one hydrogen atom of a water molecule is replaced by an alkyl group in an alcohol.

Thus, Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

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The mass percentage of Cl⁻ in the solution produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is 1.86 %.

The total mass of the solution which is produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is determined as follows:

mass of CaCl₂ = 3.0 g

mass of water = density * volume

mass of water = 1.00 g/mL * 100.0 mL

mass of water = 100.0 g

mass of solution = (100.0 + 3.0) g

total mass of solution = 103.0 g

molar mass of CaCl₂ = (40 + 35.5 * 2) g/mol

molar mass of CaCl₂ = 111 g/mol

mass percentage of Cl⁻ in CaCl₂ = 71/111

mass of Cl⁻ present in 3.0 g of CaCl₂ = 71/111 * 3 = 1.92 g

mass percentage of Cl⁻ in the solution = 1.92/103 * 100%

mass percentage of Cl⁻ in the solution = 1.86 %

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Answer: C)

Explanation:

cyclononane

Water is added to vinegar, which already contains acetic acid, to dilute it while keeping the same number of moles in the acid solution.

This makes it easy to determine the titration's end point, which helps ensure appropriate titration and accurate results.

Since the number of acid moles in the solution does not vary with the addition of water, the additional volume caused by the addition of water is not taken into account in the calculations.

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Due to the hydrogen bonding between the molecules of ethanol and water, it is True.

Water and ethanol form weak hydrogen bonds with aromatic hydrogen atoms and strong hydrogen bonds with the hydroxyl, carbonyl, and ether groups in chrysin/galangin. Although less frequently than in water, ethanol molecules can form hydrogen bonds with one another. The fact that there is only one hydrogen with a significant Positive charge in each ethanol molecule limits the hydrogen bonding. Between adjoining hydrogen and oxygen atoms of nearby water molecules, hydrogen bonds are formed. A bond called a hydrogen bond is produced by the attraction between individual water molecules.

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Answer:

151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂

Explanation:

Answer:

The flame of the candle looks to go out, but the candle continues to burn. In actuality, the copper wire coil is transferring heat away from the candle flame. The flame returns after the coil of wire is removed.

Explanation:

An acidic solution has a ph value of 0 - 6, a neutral solution has a ph value of 7, and a basic (alkaline) solution has a ph value of 8 - 14.

According to Arrhenius, an acid is a substance that releases hydroxonium ion (H3O+) as its only positive ion when dissolved in water. In other words, they are proton donors. They also turn litmus paper red, have a wet feeling and a sour taste.

A base is a substance that releases hydroxide ion (OH-) as its only negative ion when dissolved in water, according to Arrhenius. They are proton acceptors and turn litmus paper blue. They have a slippery feeling and a bitter taste.

To determine whether a solution is acidic or basic, ph indicators like litmus paper, phenolphthalein and methyl orange are used, but they do not give an exact ph value. To specifically know how acidic or basic a solution is, the ph scale is used. It comprises of a range of numbers from 0 - 14, with 0 being the most acidic and 14 being the most basic. Neutral substances like water have ph value of 7. Acidic solutions have a ph range from 0 - 6, while basic solutions have ph values from 8 - 14.

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The kinetic energy is 0.5177 × 10⁻²¹ J more at 50°C compared to 25°C.

The average kinetic energy of a molecule is directly proportional to the absolute temperature of a gas.

KE = ( 3/2 ) ( R / Nₐ ) T

Where T is the temperature of the molecule, R is the gas constant, and Nₐ is Avogadro's number.

Now, R = 8.314 J/mol.K

Avogadro's number, Nₐ = 6.022 × 10²³ atoms/ mol

The average kinetic energy at 50° C is:

T = 50° C = 323 K

KE₁ = ( 3/2 ) × ( R / Nₐ ) × T₁

KE₁ = ( 3 × 8.314 × 323 ) / ( 2 × 6.022 × 10²³ )

KE₁ = 668.90 × 10⁻²³ J

KE₁ = 6.6890 × 10⁻²¹ J

The average kinetic energy at 25°C is:

KE₂ = ( 3/2 ) × ( R / Nₐ ) × T₂

KE₂ = ( 3 × 8.314 × 298 ) / ( 2 × 6.022 × 10²³ )

KE₂ = 617.13 × 10⁻²³ J

KE₂ = 6.1713 × 10⁻²¹ J

Now,

The average kinetic energy of the molecules at 50° C compared to 25° C is:

KE = KE₁ - KE₂

KE = 6.6890 × 10⁻²¹ - 6.1713 × 10⁻²¹

KE = 0.5177 × 10⁻²¹ J

Hence, the average kinetic energy is 0.5177 × 10⁻²¹ J more at 50° C compared to 25° C.

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Answer:

It is more active

Explanation:

This atom attracts all the elecrons of the atom forming energy levels in form of orbits

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7g/mL

Density is a measure of mass per volume.

Density Formula

The density formula is  [tex]\displaystyle D=\frac{m}{V}[/tex] where m is the mass in grams (g) and V is the volume in milliliters (mL). The way I learned the formula was that the m over the V looks like a heart when written out.

We can plug the mass and volume we were given to solve for density.

[tex]\frac{14}{2}[/tex] equals 7. So, the density must be 7 grams per milliliter (g/mL).

Density Units

The units for density are important. You will not get the correct answer if you do not include your units. There are multiple ways to express density, but it is most common to have g/mL.

Additionally, density should always have the volume measurement in the denominator. This means that density will never be written in mL/g.

Answer:

k

Explanation:

k7

The equilibrium solubility of Ca (So3)2 is

Ca (So3)2 ⇋⇋ Ca2 + 2(SO3)

The Ksp (Solubility product) expression looks like this:

Ksp = [Ca2+] [SO3-]2

Ca (So3)2 generates 1 mol of Ca2+ whereas 2 mol of SO3– per mol.

[Ca2+] = 1.18*10^-4 M

[I–] = (2) × 1.18*10^-4 M

So, [I–] = 2.36 × 10^-4M

On Replacing these values in the Ksp equation.

Ksp = (1.18*10^-4M) (2.36 × 10^-4M)2

So, Ksp = 2.7848 x 10^-8 M2

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The molar fraction of 25% w/w acetic acid solution is 4.375 M.

The mole fraction, commonly known as the molar fraction (xi or I is a unit of measure for the amount of a constituent (represented in moles), ni, divided by the sum of all constituent amounts in the mixture (also stated in moles, ntot).

The Mole Fraction is the product of the molecular weight of one component divided by the molecular weight of the entire combination. When two components with reactive natures are combined, it is quite helpful.

The unit of molar fraction is  Moles/liter.

Density of solution = 1.05 kg/L

                                 = 1.05 g/ml

The molar fraction is

M = 25 × 1.05 × 10/60

    = 4.375 M

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240L of 90% solution is used to make solution.

Let, the quantity of 75% antifreeze solution be x and 90% antifreeze solution be y.

360 is the total quantity of the mixture

x + y = 360                                        (1)

Also the final solution is 85% solution

75 % of x + 90% of y = 85% of 360

0.75x + 0.90y = 0.85 × 360

0.75x + 0.90y = 306

75x + 90y = 30600                            (2)

by solving equation 1 and 2 we get

15y = 3600

   y = 240

Therefore, 240L of 90% solution is used to make solution.

Any material that lowers water's freezing point is an antifreeze, and it works to prevent ice from forming and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.

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Answer:

240L of 90% solution is used to make solution.

Let, the quantity of 75% antifreeze solution be x and

90% antifreeze solution be y.

360 is the total quantity of the mixture

x + y = 360

(1)

Also the final solution is 85% solution

75% of x + 90% of y = 85% of 360

0.75x + 0.90y = 0.85 × 360

0.75x + 0.90y=306

75x + 90y = 30600

(2)

by solving equation 1 and 2 we get

15y = 3600

y=240

Therefore, 240L of 90% solution is used to make

solution.

antifreeze, and it works to prevent ice from forming

Any material that lowers water's freezing point is an and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.

The electrons will take 7.3 times to be equal to the mass of the helium nucleus

If we want to calculate the number of electrons in the nucleus of the helium, then we have the formula for finding the number of electrons so by doing so we can get exactly the number of electrons.

The formula is that if we divide the total mass of the nucleus of the helium gas with the number of electronic mass so it will give us the number. So as a result it will take $7.28869 \times {10^{ - 59}}$ number of electrons to equal the mass of a helium nucleus.

The atomic mass of the Helium is 4.002602.

So we can conclude that the electrons will take 7.3 times to be equal to the mass of the helium nucleus.

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An barium, group 2A family atom has an atomic number of 56

Barium is a chemical element with the symbol Ba and atomic number 56 it is fifth element in group two and is a soft, silvery alkaline earth metal because of its high chemical reactivity, barium is never found in the nature as a free element, element symbol are Ba and when  If it has a charge of 1+ then barium has 56 electron then 56-1=55 electron are present barium are present in group 2A in the periodic table and called alkaline earth metal

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Answer:

A non-carbonated soft drink is a homogenous mixture or a solution

Explanation:

Non-carbonated soft drinks contains water, sweetener that are evenly mixed (or uniformly mixed if this is the reagents). And since we don't see and bubbles when it's in the drink the soft drink is a solution because the components are evenly mixed.

Answer:video camera

Explanation:

25% weight-to-weight acetic acid solution has a molar fraction of 4.375 M.

What is molar fraction?

The mole fraction is one of many ways to indicate the concentration of the solution. A mole fraction is a unit of concentration. The ratio of solute to solvent in a solution is measured using a unit called the mole fraction, which is symbolised by the letter "X."

X is a molar fraction representation. The mole fraction is defined as: moles of solute/total moles of solvent if the solution contains only components A and B. As a result, the mole fraction of each component added together is always equal to one.

The fact that the acetic acid is specified as 25% should be noted.

1.05 kg/L or 1.05 g/ml of solution density is equal to d.

Given the density, the molar fraction of a 25% weight-averaged acetic acid solution will be:

M = 25 × 1.05 × 10/60

= 4.375 M

Therefore, 4.375 M is the molar fraction of a 25% weight-to-weight acetic acid solution.

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It is because the traditional definition of a strong acid is based on the simplicity of proton (hydrogen ion) donation in aqueous solution.

The chemical compound phosphorus pentoxide has the molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). The anhydride of phosphoric acid is this white, crystalline solid. When P2O5 is dissolved in water, it produces H3PO4, or phosphoric acid (3H2O + P2O5 2H3PO4).

Phosphorus pentoxide has a molecular formula of P4O10, but its empirical formula is P2O5. But the name of the compound, not its molecular formula, was derived from its empirical formula. The official name for all of this substance is diphosphorus pentoxide.

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Answer:

3.63 g/mL (3 s.f.)

Explanation:

Density is the amount of substance per unit volume, and can be calculated by dividing the mass by the volume.

Given: mass= 59.6 g, volume= 16.4 mL

Density of block

= 59.6 ÷16.4

= 3.63 g/mL (3 s.f.)

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Answer:

The density calculator will help you estimate the relationship between the weight and volume of an object.

Explanation:

Answer:

Oxygen has more protons than hydrogen and water's shared electrons are drawn to it.

Explanation:

Volume is the correct answer

Tertiary structure is achieved when a protein folds into a compact, three-dimensional shape stabilized by interactions between side-chain r groups of amino acids.

What is the structure of proteins?

A secondary amine (in proline), a molecule with the amino group (NH 2) attached to the alkyl side chain, and an amino acid with five carbon atoms (glutamic acid), are also found in proteins. Aspartic and glutamic acids both have two carboxyl groups (COOH), making them dicarboxylic acids.

When a protein folds into a small, three-dimensional shape that is stabilised by interactions between side-chain r groups of amino acids, this is known as tertiary structure.

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