Why does water have a very high boiling point?
Select one:
A. because it forms a three-dimensional pattern called a crystal lattice
B. because it has strong attractions that hold the water molecules together
C. because it is a molecular compound
D. because it does not conduct an electric current

Explanation:

secondary amine bro go leaen

A solution of NaF is added to a solution that is 0.0144 M in Ba²⁺. When the concentration of F- exceeds 0.011 m, BaF₂ will precipitate.

Let's consider the solution of BaF₂.

BaF₂(s) ⇄ Ba²⁺(aq) + 2 F⁻(aq)

We can use the solubility product constant (Ksp) to find the equilibrium concentration of F⁻ when [Ba²⁺] is 0.0144 M.

When [F⁻] exceeds 0.011 M, BaF₂ will precipitate.

A solution of NaF is added to a solution that is 0.0144 M in Ba²⁺. When the concentration of F- exceeds 0.011 M, BaF₂ will precipitate.

What is BaF₂.?

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Correct Answer: Boron family

2.71 x 10²² molecules of CO2 is equivalent to 2.71 x 10²² atoms.

The number of molecules in an element is the combination of atoms in that element.

The number of molecules of an element can be calculated by multiplying the number of moles of that element by Avogadro's number, which is 6.02 × 10²³.

However, the number of molecules in a substance is equivalent to the number of atoms in that substance.

Therefore, 2.71 x 10²² molecules of CO2 is equivalent to 2.71 x 10²² atoms.

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Developing enduring relationships and sensing love - Taking care of others fosters empathy and the capacity to connect with others, especially through trying circumstances. Additionally, 77% of caregivers who are also employed claim that their relationship with their parents and/or in-laws has improved as a result of their caregiving.

Family supports us during both the best and worst of times, which makes these ties crucial. Family is crucial because they can provide unwavering love, support, and stability; they constantly strive to bring out the best in you even when you are unable to perceive it for yourself.

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Answer:

You can separate a mixture of sand, salt and water by decantation and evaporation. Decantation will separate sand from salt and water. Sand remains in the original vessel, whereas salt and water is transfered to new vessel. Evaporation will separate salt from water.

Answer: 75.3%

Explanation:

Mg molar mass = 24

MgCl2 molar mass = 94

—> 94 x 10 / 24

29.5/1 x 24/94 x 10

= 29.5 x 24 / 94 x 10

since we are looking for percentage yield we multiply by 100

= 29.5 x 24 x 100 / 94 x 10 = 75.3%

Volume of hydrogen (in l) is produced is 35.20 L

Given:

moles of hcl = 3.143 mol

To Find:

volume of hydrogen

Solution:

2HCl → H2 + Cl2

STP 2*22.4L 22.4L 22.4L

2 mol 1 mol 1 mol

73 gm 2gm 35.5gm

here we can see that 2 mol hcl is producing 22.4 litres of hydrogen

So, 3.143 mol hcl will produce hydrogen = 22.4/2*3.143 = 35.20 litres

Volume of hydrogen (in l) is produced is 35.20 L

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Chiari type ii malformation associated with myelomeningocele can lead to severe morbidity and mortality if it is not identified and treated promptly.

People diagnosed with myelomeningocele have abnormalities of the brain and spine, including spinal cord defects and symptoms related to the area in which the spinal column and the brain meet, known as Chiari malformation. Chiari Type II or Arnold-Chiari malformation is a worse form in which the cerebellar vermis and some portion of the brain stem descend into the cervical chine.

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Answer:

B.) More NO would form.

Explanation:

If the amount of N₂ increases, the equilibrium will be out of balance. In order to restore the balance, the reaction will shift to the products side. As such, the amount of NO will increase.

According to Le-chatlier principle, if N₂ is added to the reaction system, then more NO will be produced so as to decrease the amount of N₂.

The Le Chatlier's Principle, also known as the Le Chatlier's Law, is a principle in chemistry that states that when a system at equilibrium is subjected to a change in conditions, such as temperature, pressure, or concentration, the system will adjust its equilibrium position to counteract the change and restore equilibrium.

In other words, if a system is disturbed from its equilibrium state, it will try to minimize the effect of the disturbance by shifting the equilibrium position in a direction that partially offsets the disturbance.

If any substance is added to the system, the equilibrium will shift to the direction in which the added substance is consumed. Hence, as  N₂ is added to the system, it will consumed to give the product NO.

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Answer:

0.481 M

Explanation:

The molarity ratio looks like this:

Molarity = moles / volume (L)

Since you have been given both the mass and volume, you can plug them into the equation to find the molarity.

Molarity = moles / volume

Molarity = 0.650 moles / 1.35 L

Molarity = 0.481 M

There is a total of three atoms present in the water (H₂O) molecule.

An atom is the smallest particle of an element that may or may not be capable of independent existence.

A molecule is the smallest particle of an element or compound that can exist freely.

Subscripts are the numbers that come below after a symbol. They tell you the number of atoms of an element. If there is no subscript then it is understood that the subscript is 1.

For calculating the number of atoms in a molecule, add the subscripts of that molecule, and you will get the total atoms of it.

For example, in molecule C₂H₅O, there are 2 carbon atoms, 5 hydrogen atoms, and 1 oxygen atom.

Add the subscripts

2 + 5 + 1 = 8

Hence, there is a total of 8 atoms in C₂H₅O.

For the H₂O molecule,

2 + 1 = 3

Hence, there is a total of 3 atoms present in one water molecule.

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The pressure in atm is 6.8.

Calculation,

According to ideal gas law,

PV = nRT           ..(i)

Putting the value of all given data in equation (i) we get,

P×5.43 L =  1.82 moles ×247.50 K × 0.082 atm L/K mol

P =  1.82 moles ×247.50 K × 0.082 atm L/K mol /5.43 L = 6.8 atm

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The acidic functional group that can dissociate and release h into a solution is -COOH.

From the characteristics of -COOH group we can conclude it as the acidic functional group that can dissociate and release H into a solution.

Disclaimer: The question was incomplete

Which is an acidic functional group that can dissociate and release h into a solution?

A. -OH

B. -COOH

C. -NH2

D. -SH

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The amount of charge required to reduce Zn²⁺ to Zn is 1585.26 coulomb.

The process that has been equipped with the use of electric current to break the chemical compound and deposited at the constituent electrodes is termed as electrolysis.

The reaction of reduction of Zn can be given as:

Zn²⁺ + 2e⁻ → Zn (s)

Molar mass of Zn = 65.39 g

The equivalent of Zn²⁺ has been:

Equivalent = atomic mass/equivalent weight

Equivalent Zn²⁺ = 65.39/32.69

Equivalent Zn²⁺ = 2 mol

1 equivalent = 1 F charge used

2 mol equivalent = 2 F charge used

Charge in coulomb can be given as:

1 Faraday = 96500 coulomb

2 F = 96500 * 2 coulomb

2 F = 1,93,000 coulomb

The moles of Zn to be deposited is:

Moles = weight /molar weight

Moles = 0.5371 g/ 65.39 g/mol

Moles = 0.00821 mol

Therefore, the charge used for the deposition of 0.00821 mol is:

Charge = 0.00821 * 1,93,000 coulomb

Charge = 1585.26 coulomb

1585.26 coulomb charge was used to reduce the Zn²⁺ to Zn.

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The equilibrium expression is:

H2S (aq) + H2O (l) ⇋ H3O (aq) + HS (aq)

In order to calculate the pH of equation having aqueous solution of weak acid H2S, let’s assume that molar concentration of the products H3O and HS total released is ‘a’. Now as per given information concentration of weak acid H2S is 2.3 M. Thereby,

Ka = [H3O+] [HS] / [H2S]

1.19 x 10-7 = [a] * [a] / [2.3]

a2 = 1.19 x 10-7 x 2.3

a = 5.24 x 10-4

As per the calculation, the total concentration of the products released (HS) and (H3O) will be 5.24 x 10-4, on that basis, the pH of the weak acid (H2S) can be calculated as follows:

-log (0.000522494) = 3.28

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When an atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F), then the bond results between the atoms is ionic bond.

A chemical bond is defined as the bond which holds atoms together in molecules.

Bonds arise due to the electrostatic forces present between positively charged atomic nuclei and negatively charged electrons.

Ionic bond is defined as the transfer of electron from one atom to another atom.

Since, electron transfer from lithium to fluroine. Thus lithium get positive charge and fluorine occupy negative charge.

Thus, the bond form between lithium atom and fluorine atom is ionic bond.

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The reaction is at equilibrium. Option C

The term equilibrium constant refers to a value that shows the extent to which reactants are converted into products in the reaction.

We know that;

∆G =∆G'° + RT In Keq

∆G'°  = −4.40 kJ/mol

R = 8.314 J/K/mol

T = 25 + 273 = 298 K

Thus;

∆G = −4.40 * 10^3 + (8.314 *  298  * ln[2.90 * 10^-3/0.490  * 10^-3]

∆G =  −4.40 * 10^3 + 4.40 * 10^3

∆G = 0

Hence, the reaction is at equilibrium.

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1) Consider the following metabolic reaction:

2-Phosphoglycerate ® 3-Phosphoglycerate DG°' = −4.40 kJ/mol

What can be said about this reaction when the concentration of 2-phosphoglycerate is 0.490 mM and the concentration of 3-phosphoglycerate is 2.90 mM at 25°C?

I. This reaction is endergonic under these conditions.

II. This reaction is exergonic under these conditions.

III. This reaction is at equilibrium under these conditions.

IV. This reaction is not favorable under standard conditions.

A) I, IV

B) II only

C) III only

D) IV only

E) None of the above

2) Consider the following metabolic reaction:

3.01× 1024 particles are the number of  particles are there in 5 grams of sodium carbonate.

There are 6.022 × 1023 particles in one gram of a substance according to Avogadro's number. So when we find out for 5 grams, then we multiply 5 with 6.022 × 1023, we get 3.01 × 1024 particles. For one gram atomic weight of hydrogen, one mole of hydrogen contains 6.022 × 1023 hydrogen atoms.

So we can conclude that 3.01× 1024 particles are the number of  particles are there in 5 grams of sodium carbonate.

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Answer:

2 NaI ---> 2 Na + I₂

Explanation:

The only way the reactant NaI can decompose is by separating into 2 atoms, Na and I. However, you must take into account that iodine (I) exists as a diatomic molecule.

An equation is balanced when there is an equal amount of each element on both sides of the reaction. These amounts can be modified by adding coefficients in from of the molecules/atoms.

The unbalanced equation:

NaI -----> Na + I₂

Reactants: 1 sodium, 1 iodine

Products: 1 sodium, 2 iodine

The balanced equation:

2 NaI ---> 2 Na + I₂

Reactants: 2 sodium, 2 iodine

Products: 2 sodium, 2 iodine

This family (ethane, propane, butane, etc) of materials is likely to have following set of properties.

The ethane, propane, butane, belong to alkanes family.The alkanes are also considers as saturated hudrocarbons. Ethane is found in gaseous stae Ethane is the second alkane followed by propane followed by butane.

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The rules scientists will have to follow to give an element a symbol is by verifying it and naming it with a one-, or two-letter symbol which is usually derived from the name of the element.

This is referred to as substance which can't be broken down into simpler units by any form of chemical means.

When an element is discovered by an individual, it is best for it to be verified before it is named by the discoverer. The possible name for the element Jofrofrinium is Jo which is a two letter symbol or it could be J which is referred to as a one letter symbol.

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To prevent the system refrigerant from quickly dropping in temperature and pressure, refrigerant recovery should Begin with a liquid

In the refrigeration cycle of air conditioners and heat pumps, refrigerants are working fluids that typically go through numerous phase changes from a liquid to a gas and back again.

In the refrigeration cycle, which cools a place, a refrigerant is a material, frequently a fluid. Refrigerants use the thermodynamic phenomenon of phase transitions, in which a fluid transforms into a gas or vice versa, to absorb heat and then release it to another area.

At room temperature, it is often a gas. Ammonia, sulfur dioxide, and non-halogenated hydrocarbons like propane are further typical refrigerants that are employed in a variety of applications.

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The rate of reaction in SN2 reaction becomes four times when the the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles.

In SN2 reaction, the rate of reaction is depend on the concentration of both reactant.

For SN2 reaction,

r = k[bromoethane] [hydroxide ion]

r = k [CH3CH2Br] [OH]

When the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles then,

r = k 2×[CH3CH2Br] × 2[OH]

r = 4k[CH3CH2Br] [OH]

Thus, we concluded that the rate of reaction in SN2 reaction becomes four times.

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The acid dissociation constant (Ka) defines the difference between a weak and a strong acid. The % ionization of hypochlorous acid is 0.14%.

The acid dissociation constant is used to define the ionization constant of an acidic substance. It gives the quantitative measurement of the strength.

The ICE table is attached to the image below.

The acid dissociation constant (Ka) for the reaction is,

Ka = [H⁺][ClO⁻] ÷ [HClO]

= a² ÷ (0.015 - a)

= 3.0 x 10⁻⁸

Now, a² + 3.0 x 10⁻⁸ a - 4.5 × 10⁻¹⁰ = 0

So, a = 2.210 × 10⁻⁵

Solving further,

[H+] = a = 2.210 × 10⁻⁵ M

The percent ionization is calculated as,

[H+] ÷ [HClO] × 100

= 2.210 × 10⁻⁵ M ÷ 0.015 × 100

= 0.14 %

Therefore, 0.14 % is the percentage of hypochlorous ionization.

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Your question is incomplete, but most probably your full question was, The ka of hypochlorous acid (HClO) is 3.0 x 10⁻⁸ at 25.0°C. What is the % of ionization of hypochlorous acid in a 0.015 aqueous solution of HClO at 25.0C?

Ethylene glycol has a specific heat of 0. 578 cal/(g°c). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy. The temperature increase be 5.64°C.

The amount of heat needed to raise the temperature of 1 kg of substance.

It is expressed as

Q = mcΔT

where,

Q = Heat energy

m = Mass

c = Specific heat capacity

ΔT = Change in temperature.

Here,

Q = 75.6 cal

m = 23.3 g

c = 578  cal/(g°c)

Now put the values in above formula we get

Q = mcΔT

75.6 cal = 23.2 g ×  578  cal/(g°c) × ΔT

ΔT = 5.64°C

Thus from the above conclusion we can say that Ethylene glycol has a specific heat of 0. 578 cal/(g°c). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy. The temperature increase be 5.64°C.

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Low pressure region is formed as air masses move horizontally

Basically, an air mass is a volume of air that is doing something. A high pressure region and a low pressure area on a weather chart are examples of air masses. It may be the cloud burst that you were recently trapped in. Essentially a description of a zone that behaves consistently.

The horizontal motion of air is known as wind. When there are variations in air pressure, winds begin to blow. A force is created when air pressure is higher in one location than another. High pressure pushes the force in the direction of lower pressure.

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The hybridization of the central atom in SCl₂ is sp³.

Lewis structure is also known as Lewis dot structure which simply represent the valence electron of an atom.

Hybridization is defined as the mixing of two atomic orbitals belongs to same atom but having entirely different shapes , energies which produces a new hybridized orbitals.

Now first write the electronic configuration of central atom.

The central atom in SCl₂ is S (Sulphur).

Electronic configuration of S: [Ne] 3s² 3p⁴

One 3s and three 3p undergo hybridization to form sp³ orbitals. Here each atom forms bond with one sp³ hybrid orbital.

Thus from the above conclusion we can say that The hybridization of the central atom in SCl₂ is sp³.

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The reaction  [tex]Na_{3} PO_{4} ( aq) +3AgNO_{3} (aq)[/tex] → [tex]Ag_{3} PO_{4} ( aq) +3NaNO_{3} (aq)[/tex] is best classified as double displacement reaction.

Those reaction in which two compounds react by exchanges of ions to form two new compounds is called  double displacement reaction. The easiest way to identify double displacement reactions is to check to see whether the cations exchanged anions with each other  or not . Always balanced chemical equation is used to determine.

There are three types of double displacement reaction which is given as,

The real world example of double displacement reaction is combining vinegar and baking soda to create homemade volcano.

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The mass (g) of the original sample after decomposition is 8.3983 g.

A decomposition reaction can be described as a chemical reaction wherein one reactant breaks down into or extra merchandise.

explanation:

Reaction          2KClO₃ ⇒ 2KCl + 3O₂

moles               2               2            3

molar mass    122.55        74.55    32

Given, Mass of O₂ = 3.29g ⇒ moles of O₂

                                            =  (3.29/32) = 0.1028

3 moles of O₂  produced by 2 moles of KClO₃

Therefore, 0.1028 moles of O₂  produced by (2*0.1028/3) = 0.06853 moles of Kclo₃

Mass of KClo₃ in original sample is = moles * molar mass

                                                        = 0.06853 * 122.55

                                                       = 8.3983 g

A decomposition response occurs whilst one reactant breaks down into or extra merchandise. this may be represented through the general equation: XY → X+ Y. Examples of decomposition reactions consist of the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

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