Which diagram represents an element that is likely to form covalent bonds? A purple circle with 2 concentric circles around it. The inner circle has 2 small green spheres. The outer circle has 1 small green sphere. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 5 small green spheres. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 8 small green spheres.

Answer:

sodium carbonate

Explanation:

sodium carbonate

Taking into account the definition of Avogadro's Number, the mass of 2.50×10⁴ molecules of chlorine gas is 2.94235×10⁻¹⁸ grams.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of chlorine, then 2.50×10⁴ molecules are contained in how many moles of chlorine?

amount of moles of chlorine= (2.50×10⁴ molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of chlorine= 4.15×10⁻²⁰ moles

Being the molar mass of Cl₂ 70.9 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 70.9 grams, 4.15×10⁻²⁰ moles of the compound contains how much mass?

mass= (4.15×10⁻²⁰ moles× 70.9 grams)÷ 1 mole

mass= 2.94235×10⁻¹⁸ grams

Finally, the mass is 2.94235×10⁻¹⁸ grams.

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Answer: They form molecules

Explanation:

The forces that are acting within a nucleus is electrostatic forces of attraction.

Electrostatic forces can be described as the non-contact force and these forces can be seen as one that involves the pulling or pushing on objects without touching them.

It should be noted that the force can be generated through the activities that involves the Rubbing of some materials together  and a a result of this the charge can be gotten.

In conclusion,  the nucleus which can be described as the membrane-enclosed organelle  that i been found in the cell of the organism  that help to support live in the organism and it do contains the chromosomes, however in this nucleus the content is been held together as a result of the electrostatic forces of attraction and this attraction help the elements which are the biological element to function very well in the nucleus of the cell.

Therefore, second option is correct.

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Check the missing options:

strong nuclear force

electrostatic forces of attraction

electrostatic forces of repulsion

1) Write the chemical equations.

1.1-The chemical equation result.

1.2-The chemical equation steps.

2) Invert the second step.

3) Sum up the equation steps.

Enthalpy change

Option C.

.

Answer:

A chemical change

INFORMATION:

We have the next balanced equation

And we must find how many grams of NO are produced if 17 moles of O2 are reacted

STEP BY STEP EXPLANATION:

To find how many grams of NO are produced if 17 moles of 02 are reacted, we must analyze the equation.

We can see in the equation that:

- 1 mole of NH3 (on complete reaction) gives 1 mole NO.

- 5 moles of O2 produce 4 moles of NO, so 1 mol of O2 gives 4/5 = 0.8 mole of NO.

Thus, O2 will be the limiting reactant.

Now, if 17 moles of O2 are reacted, we must calculate the number of moles of NO that will be produce multiplying 0.8 by 17

Then, using the molecular mass of NO (30.01 g/mol), we can calculate the number of grams that are produced

ANSWER:

408.136 grams of NO are produced if 17 moles of O2 are reacted.

Moles of Li₂S will be required to completely react with 45.0 mL of 0.100 M Fe(NO₃)₃ is 0.00675 moles.

The reaction is as follows :

3 Li₂S(aq) + 2 Fe(NO₃)₃(aq) → Fe₂S₃(s)  + 6 LiNO₃(aq)

Molarity = mol / V in L

Molarity = 0.100 M

Volume = 45.0 mL = 0.045 L

now , putting the values in formula :

M = mol / V

mol = M × V

moles = 0.100 × 0.045

moles = 0.0045 moles of Fe(NO₃)₃

from the equation it is clear that :

2 moles of Fe(NO₃)₃ react with 3 moles of  Li₂S

therefore, 0.0045 moles of Fe(NO₃)₃ react with = (3 × 0.0045 ) / 2

                                                                               = 0.00675 moles of Li₂S

Thus, Moles of Li₂S will be required to completely react with 45.0 mL of 0.100 M Fe(NO₃)₃ is 0.00675 moles.

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Explanation:

Isomers are molecules of organic substances that have the same molecular formula but have different properties and structural characteristics.

Answer: Isomers

NO. One displacement reaction has occurred here. One element can substitute for another.

The majority of precipitates are created by twofold displacement processes, in which reactant ions swap locations to create new products, one of which will precipitate out of the solution.

A displacement reaction occurs when an atom or group of atoms in a molecule are replaced by another atom. For instance, when iron is introduced to a solution of copper sulphate, the copper metal is replaced. A-C-B = A + B-C. When A is more reactive than B, the preceding equation holds.

There are two displacement reactions as examples: iron sulphate is the result of the interaction between iron and copper sulphate. Iron replaces copper in this situation because it is more reactive than copper. the process by which zinc reacts with iron sulphate to produce zinc sulphate as a byproduct.

Displacement reactions come in two varieties: single displacement reactions and double displacement reactions.

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In order to answer this question we will use the Energy formula, but we will find the wavelength through this formula, the formula is:

E = hc/λ

where:

E = energy in joules, 4.125*10^-19

h = Planck's constant, 6.626*10^-34

c = the speed of light, which is also a constant, 2.998*10^8

λ = is the wavelength

We will make the arrangements to find wavelength

λ = hc/E

Now let's add our values to the formula

λ = (6.626*10^-34) * (2.998*10^8)/4.125*10^-19

λ = 4.81*10^-7

1 nanometer is equal to 1*10^-9 meters

Therefore we have 481 nanometers

Answer

A. the gain of electrons.

Explanation

Oxidation and reduction are complementary reactions. Oxidation is the process involving with loss of electrons or an increase in oxidation state by a molecule, atom, or ion while reduction is the process of gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.

Hence, the correct answer to your question is option A. the gain of electrons.

Option C. When making intricate jewelry. we choose to use a pure

metal over an alloy.

Pure metals are those metals that have not been alloyed with other metal elements; commercially natural metals are 99% natural minimal. metalmen distribute a wide range of natural metals for all your software requirements.

An alloy is an aggregate of chemical elements of which as a minimum one is a steal. in contrast to chemical substances with metallic bases, an alloy will keep all of the residences of steel within the ensuing fabric.

Alloy steel is steel that includes about five% alloying factors in its composition. these alloying elements can encompass manganese, chromium, vanadium, nickel, and tungsten. The addition of alloying factors will increase basic machinability and corrosion resistance.

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Acceleration is the change in velocity from the time he starts pushing to when he stops.

Velocity narrates how position changes, acceleration relates to how velocity changes. We can use this formula to answer velocity for the acceleration of the table Aston pushes a table across the floor with a force of 6 N. Assume the table has a mass of 6 kg and he pushes the table for 2 seconds. they may source of motion; they may also slow, stop, or velocity changes the path of an object at a time, and the forces can push or pull in any direction.

So we can conclude that At end velocity, the speed is not changing. If the speed is not changing, there is no force on the stage on the falling object or the forces acting on it are in.

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The correct solution to the task above according to the diagram is given below:

The complete diagram is attached.

The n = 1 shell simply refers to first shell in the electron orbit of an atom; specifically, shell k. The maximum number of electrons which shell k or n = 1 can accommodate or take is just 2.

So therefore, it can be deduced from above that the shell k is the same as n = 1 .

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Answer

Part A:

Given equation:

The above equation is an example of a double replacement reaction. A double replacement (or double displacement) reaction is a reaction in which the positive and negative ions of two ionic compounds exchange.

Note: The oxidation number of:

K = +1

I = -1

Ba = +2

S = -2

So, the complete chemical equation including phases of the given reaction is:

Part B:

Given equation:

Also, the equation is an example of a double replacement reaction.

Note: The oxidation number of:

K = +1

Cl = -1

Ca = +2

S = -2

The complete chemical equation including phases of the given reaction is:

Firstly, we need to write the equation for the process.

We start with hydrogen gas, H₂, and nitrpgen gas, N₂, and end with NH₃, so the unbalanced reaction is:

To balance it, we can add a coefficient of 2 to NH₃ so that N gets balanced and then we will need to add a coefficient of 3 to H₂ so H gets balanced:

With the balanced reaction, we will need the molar mass of each component, which we can calculate using the molar masses of the atoms H and N:

Now, we need to convert the masses of nitrogen gas and hydrogen gas to number of moles:

Now, we need to find which of the two is the limiting reactant, that is, which we have less considering the ratio they react.

Each 1 mol of N₂ that react will need 3 mol of H₂, so if all the 3.5697... mol of N₂ react, than we will need

10.7091... mol of H₂. Since we have 14.8818 mol of H₂, we have excess of H₂, which means that N₂ is the limiting reactant.

Since H₂ is the limiting reactant, the most that we can produce of NH₃ is the corresponding of 3.5697... mol of reacting N₂.

From the equation again, we can see that each mol of N₂ that reacts will produce 2 mol of NH₃, so if all the limiting 3.5697... mol react, we will get:

7.1397... mol of NH₃, so this is the maximum number of moles we can get of NH₃:

Using the molar mass of NH₃, we can convert this to mass:

So, the maximum mass of NH₃ you can produce with the given masses of reactant is 121 grams, which is not enough for whats has been asked.

The number of grams of solute in 1.000 L of 0.943 M potassium iodate is  201.803g

0.943M means, 1L contains 0.943 moles KIO3.

Amount in g = no of moles× molar mass.

Molar mass of KIO3 = 214 g/mol.

So, mass of KIO3 present= 214×0.943 g = 201.803g

A substance  dissolved in a solution is called a solute.  In liquid solutions, the amount of solvent  is greater than the amount of solute. One of the best examples of a solute in our daily activities is salt and water. Salt dissolves in water and therefore salt is a solute.

The major types of solute are:

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To calculate the moles of each element in methane:

We will use the avogadros number.

For C:

1 mole = 6.022x10^23 atoms

in CH4 there is only 1 carbon.

Which is 1 x 6.022x10^23 atoms = 1 mole

There is 1 moles of carbon.

For H:

For hydrogen its 4 x 6.022x10^23 atoms = 4 moles

therefore there are 4 moles of hydrogen.

The absorption spectrum of an atom is widely used to determine specific elements in different places, like different planets for example, and as the name suggests, this spectrum is the opposite of the emission spectrum and it is related to the absorption of energy in form of light. Therefore the best explanation for absorption spectrum is the electron moving to a higher energy level, since it is absorbing energy. Letter D is the best option, since letter c

The density of the unknown gas would be 0.0010 g/[tex]cm^3[/tex].

The density of a substance is a property that measures the level of compactness of the substance. The density of a substance is the ratio of the mass of the substance and its volume.

The density of a substance can be mathematically expressed as:

Density = mass in g/volume in  [tex]cm^3[/tex].

In this case, the volume of the gas is given as 2.75 L while the mass is given as 2.85 g.

2.75 L of gas is equivalent to: 2.75 x 1000

                                             = 2750 [tex]cm^3[/tex]

Thus, the density of the gas = 2.85/2750

                                        = 0.0010 g/[tex]cm^3[/tex]

In other words, the 2.95 g sample of an unknown gas stored in a 2.75 L flask will have a density of 0.0010 g/[tex]cm^3[/tex].

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808.2J heat energy needed to raise the temperature of a 30g Fe cube from 40°C to 100°C .

Given,

Fe (iron) has a specific heat capacity

= c = 0.4490 J/g°C

mass of iron = m = 30g

initial temperature = T1 = 40°C

final temperature = T2 = 100°C

thus, temperature change = ∆T = (100-40 )°C= 60°C

According to the formula of heat energy(Q) ,

Q = mc∆T

Q = 30g × 0.449J/g°C × 60°C = 808.2 J

Hence, 808.2J heat energy needed to raise the temperature of a 30g Fe cube from 40°C to 100°C .

The amount of energy needed to raise a material's heat content by precisely 1°C per gramme is known as specific heat, or Csp.

mathematically,

c = Q /m×∆T

Where

Q = quantity of heat absorbed by a body

m = mass of the body

∆t = Rise in temperature

C = Specific heat capacity of a substance depends on the nature of the material of the substance.

S.I unit of specific heat is J kg-1 K-1

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Answer:

V1/T1 = V2/T2.

Explanation:

Let's remember Charles's Law: Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas when pressure is kept constant.

Wher

Mathematically, this can be described like this:

We can use Charles's Law to compare changing conditions of gases, like this:

Where V is volume, T is the temperature, subindex 1 indicates the initial conditions, and subindex 2 indicates the final conditions.

The answer would be V1/T1 = V2/T2.

Hair is made of proteins called keratin. The protein structure includes ionic bonds, hydrogen bonds and disulfide bonds and these make the hair strong.

Hair is made of a protein called keratin. Proteins are biomolecules made of large number of amino acids.

Proteins make the body strong since it plays an essential structural function. There are  different types of proteins which are made of different number of amino acids and have different structures.

The bonds in proteins are mainly disulfide bonds, hydrogen bonds and ionic as well as covalent bonds. These bonds make the protein chain well adhered and strong.

In keratin protein, the structure is twisted and helical alpha structure with hydrogen bonds, ionic bonds and disulphide bonds which therefore, make the hair strong.

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The concentration of the iodide ions is obtained as 4.75 * 10^-4 M.

We know that the concentration has to do with the amount of substance that is in the solution. In this case, we have been told that n 38.0 mL of 0.1250 M sulfuric acid is added to 100 mL of a solution of lead II iodide a lead II sulfate precipitate is formed and when filtered we obtain 0.0471 g of the filtrate and we want to find the concentration of the iodide ions in the original solution.

We must look to the balanced reaction equation as well as the stoichiometry of the reaction as we know it in this case.

Number of moles = volume * concentration of solution

Number of moles of sulfuric acid = 38/1000 L *  0.1250 M

= 4.75 * 10^-5 moles

Now we know that the reaction is 1:1 so;

Number of moles = volume * concentration of solution

concentration of solution = Number of moles/ volume

= 4.75 * 10^-5 moles/100 * 10^-3 L

= 4.75 * 10^-4 M

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The internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass is given as

-2.33810^3 kJ/mal

This is further explained below.

Generally, The total of heat transmitted and work performed represents the change in the internal energy of a system. The change in the system's internal energy plus the PV work completed equals the heat flow.

Given

Mass of Vitamin C=29.3g

Molar mass of Vitamin C=176.124g/mol

C cal =8.31 KJJ^0

[tex]\Delta T &=68.3-21.5[/tex]

=46.8^0

Bomb Calorimeter is a fixed volume, [tex]\Delta u=q+\omega=q[/tex]

hence, heat generated by a reaction, denoted by released, equals heat generated by a calorimeter, denoted by again.

qreleased=-gained

[tex]=-C_{\text {cal }} \Delta T \\[/tex]

Where

q= heat

T is temp

=-8.31* 468^o

=-388.908KJ

[tex]$\begin{aligned} \text { No. of moles of Vitamin } C &=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}} \\ &=0.1663 \mathrm{moles} \end{aligned}$[/tex]

No. of moles of Vitamin [tex]=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}}[/tex]

=0.1663moles

On combustion of 29* 3 =0.1663  moles of Vitamin C,

[tex]$\Delta u[/tex]=-388.908KJs

Therefore Permole of Vitamin C,

[tex]\Delta u=\frac{-388.908}{0.1663}[/tex]

=-2338.592

=-2.338 *10^3  KJ/mal

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The difference between ionic, covalent and metallic bonds are

Ionic bond is formed by the transfer of valence electron from one atom to another. It is also called as electrovalent bond. example given as follows

 Na⁺   +   Cl⁻    ---->   NaCl

Covalent bond is formed when two atoms share their valence electron or we can say that by mutual sharing of one or more electrons between atoms.

H   +     H   ---->   H₂

Metallic bond is formed when collective sharing of valence electrons between several positively charged metal ions in metal lattice.

the images are attached at the end related to ionic bond , covalent bond and metallic bond.

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Solid carbon fuels having a high energy density in volume include coal and biomass. They are widely dispersed throughout the entire world. They are currently the main energy sources used in traditional thermal power plants to produce electricity.

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.

It is employed to figure out how much heat a chemical reaction produces. In calorimetry, heat flow is measured using the change in enthalpy. It is measured to assess a Joule-Thomson expansion or throttling process. To determine the minimum power required for a compressor, enthalpy is employed.

The goal of Solid Carbon is to securely and permanently store carbon dioxide (CO2) in rocks. Direct CO2 extraction from the atmosphere or ocean is the goal.

Injection of carbon dioxide causes gas bubbles to rise up like champagne bubbles from the liquid metal. The gas molecule splits up into flakes of solid carbon in a matter of nanoseconds as the bubbles pass through the liquid metal.

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The reactor was highly earthquake-resistant but vulnerable to tsunamis. Grid power or backup generators were utilized to power eight of the 11 units' Residual Heat Removal RHR cooling pumps. Despite some issues, we achieved a cold shutdown in about 4 days.

His three other reactors at lost power at 3:42 pm almost an hour after the earthquake hit, and the entire site was hit by a 15-meter tsunami. This caused 12 of the 13 backup generators on-site to fail, as well as the heat exchangers that release the reactor's waste and decay heat into the ocean.

Three reactors lost the ability to maintain proper reactor cooling and water circulation functions. The electrical switching device is also disabled. Weeks of intensive work then focused on restoring heat removal from the reactor and dealing with the nuclear accident of the overheated spent fuel pool. All three cores were mostly melted during his first three days.

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The value of 0.134 M was found to correspond to the concentration of the solution.

Titration is a technique of analysis that, as far as we are aware, relies on the volume of the solutions in order to determine the concentration of the substance being tested.

We are aware of that;

Vinegar's total volume is equal to 5 ml plus 25 ml, which equals 30 ml.

0.1098 millimolar is the concentration of sodium hydroxide.

The volume of sodium hydroxide that was utilized was calculated to be 36.48 mL by subtracting 1.35 mL from 37.83 mL.

Applying the calculation method;

CAVA/CVB = NA/VB

CBVBNA is equal to CAVANB.

CA= CBVBNA/VANB

CA = 0.1098 * 36.48 * 1/30 * 1

CA = 0.134 M

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