draw the lewis structure for xenon tetrafluoride (xef4). how many valence electrons surround the central xe atom in this structure?

A molecule is a chemical compound that is created when two or more atoms are combined. Water is an illustration of a molecule (H2O H 2 O ).

A structure made up of two or more atoms that are chemically connected to one another is called a molecule. A compound or elemental molecule could be the structure.

Two or more elements are mixed in specific amounts and precise proportions through chemical bonding to form compounds. A substance is a pure form of matter that cannot be physically separated from or refined further.

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Question:-

Which of the following is a chemical combination of two or more atoms that form specific chemical compound?

The half-life of iodine-131 is 8.0 days

Activity= 200mci

After 16 days the activity would be= 100mci

What is iodine?

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The volume of 6.00M HBr in milliliters that would be required to react with 2.46 g of na2co3 is 7.6mL

The balanced chemical equation is:

Na2CO3(s)1 mol+2HBr(aq)2 mol→2NaBr(aq)+H2O+CO2

Moles of Na2CO3 present =2.46/106=0.023

(Molar mass =2×23+12+3×16=106)

Now, according to the equation,

1 mol of Na2CO3 requires 2 moles of HBr

0.023 mol of Na2CO3 requires moles of HBr = 2×0.023=0.046 mol

Now, 6 mole of 6M HCl is present in 1000 mL

0.046 mol of 6M HCl would be present in =(1000/6)×0.046 =7.6 mL

What is volume?

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It is true that minerals or biological stuff can be transported by the wind or water, where they are then deposited and may solidify into rock.

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The ph numerically is 7.00.

What is ph?

Measure of an aqueous solution's basicity or acidity in numbers. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14.

What is titration?

A exact amount of a different substance—one that the desired constituent reacts with in a specific, known proportion—is added to the sample under test in the process of titration, a type of chemical analysis, to determine how much of each constituent is present.

moles HCl = 0.100 L x 0.200 M = 0.0200

moles NaOH = 0.0500 L x 0.250 M=0.0125

moles HCl in excess = 0.0200 - 0.0125 =0.00750

total volume = 0.150 L

[H+]= 0.00750/ 0.150L=0.0500 M

pH = - log 0.0500=1.30

at the equivalence point moles H+ = moles OH- so pH = 7.00

Therefore,  the ph numerically is 7.00.

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The gas sample is of chlorine gas.

The weight of the gas sample is 3.33 grams and it occupies a volume of 1.365 l at 95 degrees Celsius. The pressure is 790 torr.

The ideal gas equation is,

PV = (W/M)RT

Where,

P is the pressure of the gas,

V is the volume of the gas,

W is the weight of the gas

M is the molar mass of the gas,

R is the gas constant,

T is the temperature of the gas.
Putting values,

790 x 1.365 = (3.33/M)62.36 x 368.15

Solving to get the value of M,

M = 70.89 g/mol.

This is near to the mass of the gas Cl₂.

So, the gas is chlorine.

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Rank from highest to lowest boiling point

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As atomic length decreases on transferring alongside a period, the atom with biggest atomic radius is silicon, then sulfur observed with the aid of using chlorine which has the smallest atomic radius.

The periodic table, atomic radii lower from left to proper throughout a row and boom from pinnacle to backside down a column. Because of those trends, the most important atoms are determined withinside the decrease left nook of the periodic table, and the smallest are determined withinside the higher proper nook (They are in Group 16, 17, and 14 respectively.

As atomic length decreases on transferring alongside a period, the atom with biggest atomic radius is silicon, then sulfur observed with the aid of using chlorine which has the smallest atomic radius.

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An atomic radius decrease across Period 3 because the number of shells not increases but the number of electron increases and the atomic size decreases as the effective nuclear charge increases.

When we move in the period 3 from left to the right the atomic radius decreases because of the reason that the the number of shells don not change they will remain the same across the period but the number of the electron will increases . the effective nuclear charge will also increases. the nucleus will attract the electrons more strongly that the reason the atomic radius decreases.

Thus, number of electron increases and the number of shells will remain same , the atomic size decreases as the effective nuclear charge increases.

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A given sample of n2 gas has a pressure of 0.30 atm at 30.0 °c. if the volume is 2.0 l, then moles of n2 are present is 0.002.

PV=nRT

n=PV/RT

n=0.30×2÷0.82×298

n=0.6/244

n=0.002 mol

The mole concept is a helpful way to quantify the amount of a substance. When dealing with particles at the atomic (or molecular) level, it is known that even one gramme of a pure element contains an enormous number of atoms. The mole concept is frequently used in this context. The most popular unit of measurement is the "mole," which is a count of a significant number of particles. The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". Among the elementary entities that can be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

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Computational chemistry  uses methods of theoretical chemistry, incorporated into the  computer programs, to calculate structures and properties of molecules, groups of molecules, and the solids.

A subfield of chemistry called computational chemistry makes use of computer modeling to help solve chemical issues. It is crucial since the quantum many-body issue cannot be analytically solved, much less in closed form, with the exception of very recent results pertaining to the hydrogen molecular ion. While computational findings typically supplement the knowledge gained from chemical experiments, they can occasionally forecast previously unknown chemical processes. It is widely employed in the development of novel materials and medications.

Structure, or the predicted positions of the constituent atoms, absolute and relative (interaction) energies, electronic charge density distributions, dipoles and higher multipole moments, vibrational frequencies, reactivity, or other spectroscopic quantities, and cross sections for collision with other particles are examples of these properties.

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Oxygen has an electron configuration of 1s22s22p4. In order to accommodate the twelve valence electrons in O2, molecular orbitals must be large enough. two electrons in orbitals that are antibonded.

Due to less electron-electron repulsion (Hund's Rule), each of these electrons is in a different orbital. The Molecular Orbital theory encompasses the idea of bonding and antibonding electrons, thus we will first discuss the theory. Molecular oxygen has a bond energy of 498 kJ/mole. Given that oxygen possesses two electrons in an antibonding orbital as opposed to nitrogen's single electron, it is not unexpected that this is less than the 945 kJ bond energy of N2. The dioxygen molecule's two unpaired electrons give this material a peculiar and defining characteristic: O2 is paramagnetic.

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The efficiency of chlorine is hampered by phosphates, which also indirectly raise chlorine demand.

Because of this, our third pillar of proactive pool maintenance is the removal of phosphates to maintain their levels below 500 ppb (g/L). Because they weren't always a problem, phosphorus in pool chemistry is a misunderstood problem.

Phosphates are chemical substances that are frequently found in water and are formed of phosphorous and oxygen. PO4, also referred to as orthophosphate, is the most prevalent basic phosphate unit. Phosphates can be produced from phosphoric acid as salts or esters, to put it simply. Phosphates are important in swimming pools because they provide food for pollutants like algae to reproduce.

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71 g of Na2SO4 is produced if 49 gram of H2SO4 reacts with 80 gram of NaOH

Given that;

Mass of Na2SO4 is 49 gram

Mass of NaOH is 80 gram

To find number of mol we have to find molar mass of each element ;

Molar mass of Na2SO4 = 98 g/mol

Molar mass of NaOH = 40 g/mol

So, Number of mol(n) of Na2SO4 = 49/98

     n(Na2SO4) = 0.5 mol of H2SO4

Number of mol(n) of NaOH = 80/40

n(NaOH) = 2 moles of NaOH

According to the balanced chemical reaction ; H2SO4 + 2 NaOH –––> Na2SO4 + 2 H2O one mol of H2SO4 react with 2 mol of NaOH to form 1 mol of Na2SO4, same as 0.5 mol of H2SO4 react with 1 mol of NaOH to form 0.5 mol Na2SO4

H2SO4 + 2 NaOH –––> Na2SO4 + 2 H2O

(1) .. .. .. .. (2) .. .. .. .. .. .. (1) .. .. Then,

(0.5) .. .. .. (1) .. .. .. .. .. .. (0.5)

H2SO4 is the limiting and NaOH is the excess reagent.

So,0.5 mol of Na2SO4 is formed .

Mass of Na2SO4 = mol of Na2SO4 × molar mass of Na2SO4

Mass of Na2SO4 = 0.5 × 142

Mass of Na2SO4 =  71 g of Na2SO4

So,  71 g of Na2SO4 will produced

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Explanation:

The term wave number refers to the number of complete wave cycles of an electromagnetic field (EM field) that exist in one meter (1 m) of linear space. Wave number is expressed in reciprocal meters (m-1). The wave number for an EM field is equal to 2 pi divided by the wavelength in meters.

The frequency ( ) of a wave is the number of waves passing a point in a certain time. We normally use a time of one second, so this gives frequency the unit hertz ( ), since one hertz is equal to one wave per second.

Three quantities used for measuring waves are

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The moles of gas collected during the reaction carried out under normal conditions of pressure and temperature and occupying a volume of 50 cubic centimeters were 0.002 moles.

To calculate the number of moles of gas that were collected, the ideal gas formula PV = nrt is used

Assuming the normal conditions of temperature and pressure, we have the following data

n = ?

V = 50 cm3 = 0.05 L

R = 0.082 L atm / mol °K

t = 25°C = 298°K

P = 1 atm

n = PV / Rt

n = 1 x 0.05 / 0.082 x 298

n = 0.05 / 24,436

n = 0.002 mole

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The effects of chemical exposure includes difficulty in breathing and blistering of skin.

Well we are working in a laboratory, there are a few certain ways in which a harmful chemical can harm us.

For an example, if any chemical is easily evaporated at the room temperature then there is a very high possibility that we may inhale the chemical along with air into our lung which make create difficulty in breathing.

Also some chemicals like concentrated hydrochloric acid or concentrated Sodium Hydroxide are the chemicals which can produce blistering of skin when they come in contact with the human skin.

The above stated effects are the consequences of chemical exposure.

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Answer: The option B. 3 is the answer.

Boron has an Atomic mass of 11 and 5 protons and 6 Neutrons.

The Electrons are also in the correct positions to be a boron atom.

True, The solubility of gasses in water decreases with an increase in temperature.

What is solubility?

A substance's solubility is the greatest amount that will dissolve in a given amount of solvent at a given temperature. A specific solute-solvent combination's solubility is a defining trait, and the solubility of various compounds can vary significantly.

When temperature rises, molecules' vibrational kinetic energy increases, breaking intermolecular bonds and allowing gases to escape from the solution, the solubility of gases in water is inversely proportional to temperature.

Hence, the solubility of gasses in water decreases with increase in temperature.

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The next external force exerted on the papaya is 7.7 N.

Force is the power that changes the motion of the object. The external force that accelerated the papaya across the table must be resolved in this problem. We can solve the external force by applying the idea of Newton's first law of motion.

F = ma

where

F     is the force, the unit is in Newtons (N)

m    is the mass, the unit is in kg

a     is the acceleration, the unit is in m/s²

Given that, m = 3.5 kg

a = 2.2 m/s²

F = ?

F = ma

Substitute the given data

F = (3.5 kg) (2.2 m/s²)

F = 7.7 N

Therefore, the external force of the papaya is 7.7 N.

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The question is incomplete. Your most probably complete question is given below:

What is the next external force exerted of the papaya?

Some Examples of primary bonds such as ionic bond,covalent bond and metallic bond;

-Example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom

-Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.

-Metallic bonding, is especially common in minerals involving transition metals. Gold, silver, and copper are examples of minerals with metallic bonds.

Chemical Bond and its type :-

A chemical bond is a lasting attraction between atoms or ions that enables the formation of molecules and crystals. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds, or through the sharing of electrons as in covalent bonds. The strength of chemical bonds varies considerably; there are "strong bonds" or "primary bonds" such as covalent, ionic and metallic bonds, and "weak bonds" or "secondary bonds" such as dipole–dipole interactions, the London dispersion force and hydrogen bonding. Strong chemical bonding arises from the sharing or transfer of electrons between the participating atoms.

There are three primary types of bonding: ionic, covalent, and metallic.

An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell.

A covalent bond is formed when the valence electrons from one atom are shared between two or more particular atoms.

A metallic bond is formed when the valence electrons are not associated with a particular atom or ion, but exist as a "cloud" of electrons around the ion centres.

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An entirely bonded molecular orbital has non-zero electron density, no nodes, and is perpendicular to the internuclear axis.

Molecular orbital-Molecular orbitals are linear combinations of atomic orbitals that represent the electron distribution across two or more atoms. A molecular orbital is the orbital or wavefunction of an electron in a molecule.

A mathematical function termed a molecular orbital describes the position and wave-like behavior of an electron inside a molecule.. You can compute chemical and physical attributes using this function. Electrons in the vicinity of a molecule can be associated with multiple atoms and are frequently expressed as a combination of atomic orbitals.

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The new volume (in ml) assuming the moles of gas and temperature are held constant is 72.4 ml.

What is pressure?

A barometer or manometer can be used to measure pressure, which is the force applied per unit area. For an accurate physical description of a sample of a gas, four variables must be known: temperature, volume, quantity, and pressure. The SI unit for pressure is the pascal (Pa), which equals one newton per square meter (N/m²) of surface area. Pressure is defined as force per unit area of surface. An object's pressure is inversely proportional to the area on which the force is applied, and it is proportional to the force it exerts.

We have,

At constant temperature = P₁V₁ = P₂V₂

Where,

Initial pressure, P₁ = 1.00 atm

Final pressure, P₂ = 3.45 atm

Initial volume, V₁ = 250 ml

Final volume, V₂ = ?

Putting values in the formula

=(1.00 atm) × (250ml) = (3.45 atm) × V₂

V₂ = 72.4 ml

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The kinetic strength of one mol of nitrogen molecules at three hundred K is 3741.3 Joules.The KE is 41 kj.

We recognize that,Kinetic strength ∝ TIn the question, temperature is equal in each conditions. So, the kinetic strength withinside the 2d situation is E.Room imply rectangular velocity is given by

vrms=√3RTM

Here,M= Molar mass of fueloline moleculeT= temperature of the fueloline moleculeWe have given VN2=VH2

∴√3RTN2MN2=√3RTH2MH2

⇒TH22=57328⇒TH2≈41 K

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Answer:

This is because of the lone pairs present in the molecules. Bond and lone pairs of electrons have maximum mutual repulsion but lone pairs of electrons have a stronger mutual repulsion than bond pairs thus creating a bent or v shape in water and trigonal pyramidal shape in ammonia.

There are 4 pairs of electrons in water. if all were bond pairs then the bond angle would be 109.5 but because of the the two lone pairs you take away 2.5 per lone pair from 109.5. Same goes to ammonia if they were all bond pairs then it would be 109.5 but because of the one lone pair it becomes 107.

Explanation:

(a) The final volume after expansion is V2=4.29 L.

(b) The final temperature after the expansion is, T2=879K.

(c) The gas pressure after the decrease is P2=1atm.

(d) The final gas pressure is P3 = 3atm

Let V1 be the initial volume of the gas. Considering nitrogen as an ideal gas, use the ideal gas equation to find the initial volume as,

P1V1=nRT1...............(1)

Consider the value of universal gas constant as,

R=0.0821L⋅atm⋅mol⁻¹⋅K⁻¹.

Convert temperature to Kelvin,

T1=(20+273)K=293K

Consider the molar weight of nitrogen gas as, mm=28g/mole.

The number of moles in 5g of nitrogen gas is,

n=m/mm

Substitute the known values,

n=5g/(28g/mole)

=0.179mol

Substitute all the known and calculated values in equation (1),

V1=0.179mol×0.0821L⋅atm⋅mol−1⋅K−1×293K3atm/3 atm

=1.43L

B.

The final temperature after the expansion is, T2=879K.

The temperature after the expansion is evaluated using the formula,

V1/T1=V2/T2

T2=V2T1/V1

Substitute the known values,

T2=4.29L×293K/1.43L

=879K

C .

The gas pressure after the decrease is P2=1atm.

Using relation,

PV/T=constant

Since volume is kept constant,

P1/T2=P2/T3

P2=P1T3/T2

Substitute the known values,

P2=3atm×293K/879K

=1atm

D.

The final gas pressure is P3 = 3atm

Given data:

Gas is isothermally compressed to regain the initial volume, that is,

V3=1.43L .

Using relation,

PV/T=constant

Since temperature is kept constant,

P2/V2=P3/V3

P3=P2V2/V3

Substitute the known values,

P2=1atm×4.29L/1.43L

=3atm

The final gas pressure is P3=3atm

Pressure (symbol: p or P) is the force normal to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pound-force per square inch (psi) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this.

Therefore, manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

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The reaction between CH4(g) + 2O2(g) and CO2(g) + 2H2O(l) results in an enthalpy change of -891 kJ/mol.

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The duration needed for a drug's active ingredient to halve in your body is known as the half-life.

The duration needed for a drug's active ingredient to halve in your body is known as the half-life. According to how the body breaks down and eliminates the substance, this will happen. It can range from a few of hours to a couple of days, or even a couple of weeks. It may be possible for you to switch to a similar drug with a longer half-life if you are on a short-half-life medication and experiencing withdrawal symptoms. This medication with a longer half-life might be simpler to stop taking.

The duration of a drug's half-life can also serve as a reference for how long it will take for your body to adjust to its first dose and reach a steady level. It will typically take around.

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Six electrons are transferred in the formation of Al₂O₃.

Aluminum metal and Oxygen react to form Al₂O₃ as,

                 2 Al  +  3/2 O₂    →    Al₂O₃

Oxidation number of Al on left hand side is zero, while than on right hand side in Al₂O₃ is +3.

It means it has lost 3 electrons per one atom and six electrons per two atoms. Also, the oxidation number of O at left hand side in O₂ is zero, while that in Al₂O₃ it is -2 per atom and -6 per 3 atoms.

So, two Al atoms have lost 6 electrons and 3 O atoms have gained six electrons.

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Answer:

6

Explanation:

Al has a left-side oxidation number of zero and a right-side oxidation number of three. means that it has lost three electrons for every single atom and six for every two atoms. Additionally, the left-hand side of O2 has an oxidation number of zero, whereas Al2O3 has an oxidation number of -2 per atom and -6 per three atoms.  Thus, three O atoms have received six electrons whereas two Al atoms have lost 6 electrons.