xeof4 has one of the more interesting structures among noble gas compounds. on the basis of its symmetry, a. obtain a representation based on all the motions of the atoms in xeof4.

The compounds are enantiomers.

Enantiomers are pairs of compounds that have exactly the same connectivity but opposite three-dimensional shapes. Enantiomers are not the same. One enantiomer cannot be superimposed on top of the other. Enantiomers are mirror images of each other. The easiest way to distinguish between enantiomers is to recognize that two molecules are mirror images of each other.

Enantiomers must be mirror images. The molecules in the image above are reflected on a thick line representing a specular surface. Examples of enantiomeric pairs of substances are the two optically active forms of tartaric acid called d-tartaric acid and l-tartaric acid. Stereoisomers that are mirror images of each other and are not superimposable are called enantiomers. Molecules whose mirror images are not superimposable and exist as enantiomeric pairs are said to be chiral and exhibit chirality.

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The iodine staining technique is one of the methods that can be used as a stain for TLC, however, there are many stains that can be used to identify specific functional groups.

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Answer:

the answer is....... D. Plasma

Answer:

Plasma

Explanation:

Got it right

The pH of the resulting solution when 100. 0 ml of a 0. 500 m aqueous hydrazine is mixed with 100. 0 ml of 0. 500 m aqueous hydrochloric acid is 4.54

Since hydrazine is a weak base and hydrochloric acid is a strong acid.

No. of moles of hydrazine =( 100 × 0.500 ) mmol

                             = 50 mmol

No. of moles of hydrochloric acid =( 100 × 0.500 )

                            = 50 mmol

Since the number of mmol of base and acid is equal. Hence complete neutralization will take place because acid and base react in 1 : 1 mol ratio.

So after neutralization, a salt will be formed which will be acidic in nature because salt formed by the neutralization of strong acid and weak base will be acidic in nature.

Hence pH will be less than 7. Because an acidic solution has pH less than 7 .

The Kb is 3.0x10^-6

pKb=-logKb

pkb=-log(3.0x10^-6)

pkb=5.2287875

The concentration of salt is 50/200=0.25 M

pH=7-1/2pKb-logC

pH=7-1/2(5.2287875)-1/2log(0.25)

pH=4.54

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From the comparison of methane and hydrogen gases, it is found that Hydrogen gas, H₂ will be the best fuel

From the given question, we have:

CH4 and H₂ have fuel values as following;

For CH4=55.5mj/kg

For H[tex]_{2}[/tex]=142mj/kg

When we combust CH4 It will produce CO[tex]_{2}[/tex] gas and water as a product. The CO[tex]_{2}[/tex] gas is an environment pollutant and it also has low fuel value

However, if we combust H₂, It will produce only H₂O, which is environmentally healthy and also produces more fuel value.

Hence, H₂ will be the best fuel

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A smaller volume of an experiment, like 5 cm³, does not lead to wastage of the product and does not alter the testing procedures.

Why should the volume be controlled in an experiment?

The variable, like volume, is regulated (or maintained at the same level) to conduct a fair test. In this case, the object's volume can be altered. The mass of the substance will increase as the volume does. The quantity of atoms inside an object increases with its volume.

Advantage

The margin of error decreases with increasing study sample size. The risk of reporting false-negative or false-positive results can be reduced by researchers by using a larger volume. The accuracy of results will increase as the number of samples increases.

Disadvantage

It takes longer to gather, thus burdening the people collecting the larger volume of samples. In some circumstances, likely, the collection deadline will negatively impact how smoothly the production line runs.

Hence, there are both advantages and disadvantages of using a larger volume.

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The volume of the system is found to be 5.097L and the % error is found to be 13.2%.

Every three-dimensional item requires some amount of space. The volume of this space is measured. Volume is defined as the space occupied by an item inside the confines of three-dimensional space. It is also known as the object's capacity. Volumes change depending on the form.

The absolute value of the difference between the measured and actual values is divided by the actual value and multiplied by 100 is the % error. Percent mistakes indicate the magnitude of your errors while measuring anything in an experiment. Smaller numbers of % error indicate that you are getting nearer to the acceptable or true value.

Given:

P = 12atm

n = 2 moles

T = 100℃ = 100 + 273 = 373K

To find:

(a) V = ?

(b) % error = ?

Formula:

PV = nRT

% error = (experimental – actual) / actual x 100

Calculations:

(a) V = nRT/P

V = 2 x 0.082 x 373 / 12

V = 5.097L

(b) % error = (5.097 – 4.5) / 4.5 x 100

% error = 0.597 / 4.5 x 100

% error = 0.132 x 100

% error = 13.2%

Result:

The system’s volume is 5.097L and the % error is 13.2%.

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Total current flows through the cell I = 0.32 Amp

An electrochemical cell is a device that either generates energy from chemical reactions inside of it or uses electricity to power various chemical processes inside of it.

Given,

Sodium ion flows from anode and negatively charged ion flowing from cathode

so if you write the equation that will be

Na - e ⇄ Na⁺

Cl⁻ + e ⇄  Cl

Now current flowing is the number of charges flowing per unit second

here total current is due to cation (Na⁺) and anion (Cl)

so only one electron is associated here,

so total current (I) = 10¹⁸ ˣ 1.6 ˣ 10⁻¹⁹ Amp.  

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Yes, Alan and Faisyal are both correct. Two metals or objects can have the same outward structure but different masses. This is because of the way their atoms or particles are arranged. The way in which the particles of matter are arranged is called Density.

The degree of compactness of a substance is measured by its density. It is the amount of mass per unit volume that determines the degree of uniformity. It is the connection between a substance's mass and the quantity of space it takes up.

The density of a material is its mass per unit volume. The most common sign for density is ρ, however, the Latin letter D can also be used. Density is defined mathematically as mass divided by volume.

The formula for density is given as ρ= m/V, where is the density, m is the object's mass, and V is the object's volume. The density of an item is defined as its mass per unit volume. The kilogram per cubic meter (kg/m3) is the SI unit of density.

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An unknown mixture is set in beaker on the teacher's table the five different parts of the mixture and we can separate it by method evaporation, distillation, sedimentation, and filtration

Mixture is the composed of one or more pure substances in varying compositions called as mixture and unknown mixture is separated by  shake the separatory funnel to allow intimate mixing of the solutions and effect extraction of the compound from the organic mixture and mixture can be physically separated by sedimentation process, filtration, crystallization, distillation, diffusion, panning, magnetic separation, and adsorption are a few of the methods used to separate materials and the substance is said to be pure when a sample of it has purified all other type of material

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For ease of use, the temperature was set to zero degrees Celsius. The velocity of particles is represented by zero on the absolute (Kelvin) scale. Absolute temperature changes cause corresponding changes in pressure or volume.

Temperature is a physical parameter that describes how hot stuff or radiation is.

such as the SI scale; those that rely solely on purely macroscopic properties and thermodynamic principles, such as Kelvin's original definition; and those that are not defined by theoretical principles but are defined by convenient empirical properties of particulate matter.

A thermometer is used to measure temperature.

The coldest a body can be conceived to be is one with an absolute zero temperature. It can only be approximated extremely closely, but not actually reached, in experiments.

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Explanation:

When a virus infects a bacterial cell, often new viruses are assembled and released when the host bacterial cell is lysed. If these new viruses go on to infect new bacterial cells, the new host cells may not be lysed. What is the most plausible explanation for this?A) The bacterial cell must be resistant to infection by the virus.

B) The virus carries genes that confer resistance to the host bacterial cell.

C) The host bacterium couples the viral infection with transformation.

B) The virus carries genes that confer resistance to the host bacterial cell.

C) The host bacterium couples the viral infection with transformation.

Answer:

LCD TV's use a CCFL for backlighting

10 meters below sea level results in 1 atm of additional pressure.

The pressure increases about one atmosphere for every 10 meters of water depth.

We know,

1 atm pressure = 1.01325 bar                                   equation1

Gravitational acceleration = 9.81 [tex]m/s^{2}[/tex]                    equation2

Density of water = 1000kg/[tex]m^{3}[/tex]                                 equation3

P = (density of water) (gravitational acceleration) (height under water)

Substitute values from  equation1 ,  equation2 and  equation3 in formula of pressure under water.

P = (1000) (9.81) (10.33)

P = 101325 Pa(Pascal)                           (1bar = [tex]10^{5}[/tex] Pascal)

Now we need to convert Pascal to Bar using the relation (1bar = [tex]10^{5}[/tex] Pascal).

P = 1.01325 bar

Thus we can conclude that 10 meters below sea level results in 1 atm of additional pressure.

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For producing 639L of [tex]SF_6[/tex], a volume of 1916.96L of [tex]F_2[/tex] gas is required for the reaction.

If the pressure and temperature at which the reaction occurs is known, we may use the ideal gas law to compute the stoichiometry of processes involving gases by using the connection between the volume (in liters) and quantity of gases (in moles). A chemical reaction's volume of gas can be evaluated by collecting it in an inverted vessel filled with water. The gas pushes water out of the vessel, and the amount of liquid displaced is proportional to the amount or volume of gas.

Given:

Volume of [tex]SF_6[/tex] = 639L

Pressure, P = 2atm

Temperature, T = 273.15K

To find:

Volume, V of [tex]F_2[/tex] gas = ?

Formula:

PV = nRT

Calculations:

No. of moles of [tex]SF_6[/tex] = 2 x 639 / 0.082 x 273.15

No. of moles of [tex]SF_6[/tex] = 57.057 moles

[tex]S (s) + 3F_2 (g) \rightarrow SF_6 (g)[/tex]

From the reaction,

1 mole of [tex]SF_6[/tex] is formed from 3 moles of [tex]F_2[/tex]

Therefore,

No. of moles of [tex]F_2[/tex] = 3 x 57.057 = 171.171 moles

Volume of [tex]F_2[/tex] = 171.171 x 0.082 x 273.15 / 2

Volume of [tex]F_2[/tex] = 1916.96L

Result:

1916.96L of [tex]F_2[/tex] gas is required to produce 639L of [tex]SF_6[/tex].

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In the diagnosis of cystic fibrosis caused by gene mutation, the mass of AgCl formed and the mass of [tex]Cl^-[/tex] remaining are 0.003583g and 0.006203g respectively, and the % of [tex]Cl^-[/tex] precipitated is 12.5%.

Cystic fibrosis (CF) is a hereditary condition that causes respiratory and gastrointestinal issues. An alteration (mutation) in the gene that produces the cystic fibrosis transmembrane regulator (CFTR) protein causes cystic fibrosis. To be born with CF, a new born must get two copies of the CF gene, one from each parent.

Cystic fibrosis causes thick, sticky mucus to accumulate in the lungs. CF causes recurring lung infections and makes breathing difficult over time. Other organs of the body, like the pancreas, might be affected by Cystic fibrosis, making it difficult to digest meals and maintain a healthy weight.

a) Mass of AgCl precipitate = no. of moles x molecular mass

Mass = 0.025mol/L x 0.001L x 143.32g/mol

Mass = 0.003583g

b) Mass of [tex]Cl^-[/tex] remaining in solution after precipitation = no. of moles x molecular mass

No. of moles of [tex]Cl^-[/tex] = 0.2mol/L x 0.001L = 0.0002 mol

No. of moles of [tex]Ag^+[/tex] = 0.25mol/L x 0.001L = 0.000025 mol

Mass of [tex]Cl^-[/tex] remaining = (0.0002 – 0.000025) x 35.45

Mass of [tex]Cl^-[/tex] remaining = 0.006203g

c) % of [tex]Cl^-[/tex] precipitated = 0.000025 / 0.0002 x 100 = 12.5%

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The drawing below shows the effect of moving air on a desert sand dune describes the event in the drawing it is an example of erosion by wind

Natural sand dunes usually start as windblown sand that accumulates in a sheltered area behind some type of obstacle such as piles of seaweed and a hill of sand made up of wind on the coast or in a desert and it is because of erosion by wind strong winds blow across the loose sand on the surface of the earth including sands found in deserts and beaches that's why  erosion by wind most likely describes the event in the drawing

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Taking into account the definition of enthalpy of a chemical reaction,  the value of ΔH for C + 3D → A + 2B is -157 kJ.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

A negative value of an enthalpy change indicates an exothermic reaction; a positive value of ΔH indicates an endothermic reaction.

Reversing the direction of a chemical equation changes the arithmetic sign of ΔH because a process that is endothermic in one direction is exothermic in the opposite direction.

In this case, the balanced reaction is:

A + 2B → C + 3D

and the enthalpy reaction ∆H° has a value of 157 kJ and it is an endothermic reaction.

To calculate the value of ΔH for C + 3D → A + 2B, you can see that the reaction is inverted, being in this case an exothermic reaction. Then, the enthalpy value must be reversed from sign.

Finally, the value of ΔH is -157 kJ.

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Removing energy from water at 25 °C   the temp of the water will decreases.

When we remove the heat from water the temperature of water will falls and water will cool down. The water is cool; down when we remove the heat from it and the kinetic energy decreases of the particles. once the temperature recaches to the freezing point then there will be no further change in temperature. This is the phase transition from liquid to solid.  By the removal of heat will cause the particle of water to locking up into place.

Thus, Removing energy from water at 25 °C   the temp of the water will decreases.

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The hybridization scheme employed by a central atom when forming more than four bonds is sp3d

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Answer:

The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table – they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.

Explanation:

The metal that reacted most vigorously when placed in the acid is sodium, as it is an alkali metal.

At standard temperature and pressure, all of the bright, soft, extremely reactive alkali metals rapidly shed their outermost electron to create cations with charge +1.

One of the most reactive metals is the alkali metal. They have greater atomic radii and low ionization energies, which contribute to this. They have an oxidation state of 1, and they frequently give electrons during reactions. These metals stand out for their supple texture and silvery hue.

The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table – they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.

Therefore, the correct option is d. sodium.

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

Oxygen

magnesium

iron

sodium

The correct statement in the process of balancing the equation is option C which is Do nothing, the equation is already balanced.

The chemical equation which is given in the question is -

CH₄ + O₂ → CO₂ + 2 H₂O

This reaction is a balanced chemical reaction as number of atoms of product and reactant are equal.

Number of carbon atoms on reactant side is 1 and number of carbon atoms on product side is also 1. Number of oxygen atoms on product side is 2 and hydrogen atoms is 4 and on reactant side, number of oxygen atom was 1 and number of hydrogen atom was 2 but after adding coefficient 2 in front of H₂O, number of Oxygen atoms became 2 and number of hydrogen atom became 4 making it a balanced reaction.

Therefore, correct option for process of balancing the equation is C.

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The main reaction of 4-aminophenol with acetic anhydride gives paracetamol with acetic acid as a side product.

What is paracetmol?

The most popular analgesic in the world and the first choice for treating pain disorders is acetaminophen (paracetamol), widely known as Tylenol. It is also employed for its antipyretic properties, which lower fever. due to the risk of lethal overdose and liver failure brought on by improper acetaminophen use. For more on the paracetmol structure and uses, see the attached file.

It is frequently used to treat mild to moderate pain, such as headaches, toothaches, and sprains, as well as to lower fevers brought on by ailments like the flu and the common cold. Since it's generally safe to consume and has few side effects, paracetamol is frequently suggested as one of the initial therapies for pain.

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The correct decreasing order of the basic strength of amines in an aqueous solution is (C2H5)3N > (C2H5)2NH > C2H5NH2.

The ability of a chemical to share electrons with nearby atoms is referred to as the chemical's fundamental strength.

The nitrogen atom becomes electron-rich as a result of the lone pairs. The +I effect is the second component.

Because the three benzene rings are connected to nitrogen and stearic hindrance forms as a result, nitrogen is unable to donate its lone pair to the rings, giving (C2H5)3N the highest degree of +I effect out of all the supplied amines. Lone pairs are so accessible for the incoming atoms.

As a result, (C2H5)3N > (C2H5)2NH > C2H5NH2 is the order.

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The correct option is D. Dry ice changes directly to carbon dioxide gas

A material can move straight from the solid to the gas state by sublimation without going through the liquid state. The triple point on a material's phase diagram corresponds to the lowest pressure at which the substance can remain as a liquid, and sublimation is an endothermic process that takes place there. Deposition, also known as desublimation, is the opposite of sublimation, in which a material transitions straight from the gas phase to the solid phase. A solid-to-gas transition (sublimation) followed by a gas-to-solid transition has also been referred to as sublimation (deposition)

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complete question:

Min was writing about changes in the state of matter for a research paper. Which of these changes might she include as examples of sublimation?

Choose the two statements that apply.

A. Clothing is hung outside on a day when the temperature is below the freezing point of water. The clothes dry, even though they freeze first.

B. An ice cube melts on the floor, then it evaporates.

C. Bromine is a reddish brown, liquid element. In a closed container, a reddish brown gas exists above the surface of the bromine.

D. Dry ice changes directly to carbon dioxide gas

Explanation:

The reaction of aqueous solutions of iron(II) sulfate and ammonium phosphate leads to the formation of solid precipitate of iron phosphate and an aqueous solution of ammonium sulphate.

Molecular equation :

3

F

e

(

S

O

4

)

(

a

q

)

+

2

(

N

H

4

)

3

P

O

4

(

a

q

)

→

F

e

3

(

P

O

4

)

2

(

s

)

+

3

(

N

H

4

)

2

S

O

4

(

a

q

)

Total ionic equation :

3

F

e

+

2

(

a

)

+

3

(

S

O

4

)

2

−

(

a

q

)

+

6

(

N

H

4

)

+

(

a

q

)

+

2

P

O

3

−

4

(

a

q

)

→

F

e

3

(

P

O

4

)

2

(

s

)

+

6

(

N

H

4

)

+

(

a

q

)

+

3

S

O

2

−

4

(

a

q

)

Net ionic equation :

By canceling the spectator ions from total ionic equation, we get

3

F

e

+

2

(

a

q

)

+

2

P

O

3

−

4

(

a

q

)

→

F

e

3

(

P

O

4

)

2

(

s

)

Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

​

​

​

​

Both the substrates as well the enzymes do not undergo denaturation since the enzyme was incubated with the substrate and it lost its activity.

When a certain substrate comes into contact with an enzyme, it will bind to the active region. Binding of the substrate to the active region of the protein results in the formation of a more stable enzyme substrate complex. This is because the enzyme substrate complex is more resistant to heat denaturation than just the enzyme.

Because the enzyme-substrate complex ground state has a lower energy level, more energy is required to overcome this energy barrier and denature the enzyme. In the question, it is given that 3% of the enzyme lost its activity, which might have happened when the enzyme and the substrate were incubated. Only 3% of the enzyme was liberated after the denaturation step, leaving 97% occupied with substrate.

As a result, neither the enzyme nor the substrate undergoes denaturation.

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Answer:

Subtract the atomic number (the number of protons) from the rounded atomic weight. This gives you the number of neutrons in the most common isotope. Use the interactive periodic table at The Berkeley Laboratory Isotopes Project to find what other isotopes of that element exist.

Explanation:

Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

Answer:

c

Explanation:

ch4 + 4cuo --> CO2 + 2h20 + 4cu

Aluminium appears unreactive. This is because of the formation of aluminium oxide layer in its outer surface.

This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide on its surface. This oxide layer is very stable and acts as a protective coating by preventing further reaction of aluminium.

Also, Aluminium is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils.

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