A neutral atom of a certain element has 15 electrons. a. what is the ground state electron configuration of the element?b. how should the element be classified ?c. are the atoms of this element diamagnetic or paramagnetic?

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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2,5 are the two phrases describing the synthesis of amino acids are accurate.

Alpha-ketoglutarate is transaminated in the human body to produce lysine, an important amino acid. The precursor is reduced during the amino acid alanine's synthesis, and oxidation occurs during alanine's breakdown.

The precursor is reduced during the amino acid alanine's synthesis, while oxidation occurs during alanine's breakdown. Metabolic pathway intermediates and alpha-keto acids are the carbon sources for the production of non-essential amino acids.

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The mini marshmallows would extend to a height of 1.843 x 10 km above the surface of Colorado if they covered the state without any space between them.

To find the height of an Avogadro number of Marshmallows, first, we need to find the total volume of all the mini marshmallows.

Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm, so its volume can be calculated as:

V = πr²h

Volume = π * (0.3175 cm) * (2.54 cm)

Volume = 0.8217 cm³

Avogadro's number is 6.02 x 10²³, so the total volume of all the mini marshmallows can be calculated as:

Total volume = 6.02 x 10²³ * 0.8217 cm³

Total volume = 4.947 x 10³ cm³

Now we can use the land area of Colorado to find the height to which the mini marshmallows would extend if packed together without any space between them.

1.037 x 10⁵ mi² is equal to (1.037 x 10⁵ mi² * 2.59 x 10⁶  = 2.685 x 10¹¹ m²

If the mini marshmallows cover this area without any space between them, their height can be calculated as:

Height = total volume/area

Height = (4.947 * 10²³ cm³) / (2.685 x 10¹¹ cm²)

Height = 1.843 x 10² cm

Converting to kilometers, we get:

Height = (1.843 x 10¹ ²cm) / (100,000 cm/km)

Height = 1.843 x 10⁷ km

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Answer:

-8 m/s^2

Explanation:

The formula for acceleration is:

a= v^2 - v^1/t

a= acceleration

v^2- final velocity which in this case would be 0 since the jet comes to a stop.

v^1= original velocity which is 80 m/s.

t=time or 10s

Substitute the letters for the numbers and you get this:

a= 0 - 80/10

0 - 80= -80

-80 divided by 10 is -8.

Hope this helps! :)

Answer:

Explanation:

3 N₂ (g)  + 2  O₃ (g)   →     6 NO (g)

Δ H(rxn ) = 90.37x 6 - ( 0 + 142.26 x 2 )

= 542.22  - 284.52

= 257.7 kJ

Δ S(rxn ) = 6 x 210.6 - ( 2 x 237.7 + 3 x 191.5 )

= 1263.6 - ( 475.4 + 574.5 )

= 213.7 J / K

Δ G = Δ H - T Δ S

= 257.7 - 350  x 213.7

= - 74537.3 kJ  .

Δ G / mole = - 74537.3 / 6 = - 12422.88 kJ / mol.

Answer: chemical

Explanation: whenever heat is applied, it indicates a chemical change

First, remember that:

The vapor pressure of a liquid is directly related to the intermolecular forces present between its molecules. If these forces are stronger, the evaporation rate and the vapor pressure will be lower.

So, we're going to analyze the intermolecular forces of each element:

O2: The molecule of oxygen consist of two oxygen atoms bonded together by a double bond. It consist of just London dispersion forces, so this is a really weak force.

H2O: Water has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces. So it has strong forces.

SO: It consists of London dispersion forces, and there's a difference of electronegativity between S and O, so there's a greater force than the force of O2.

Therefore, O2 could have the highest vapor pressure, as its intermolecular forces are the weakest.

The final pH of the solution would be 2.2

The final pH of the solution can be calculated using the Henderson-Hasselbalch equation, which states that the pH of a buffer solution is equal to the pKa of the buffer plus the logarithm (base 10) of the ratio of the concentration of the buffer's conjugate base to the concentration of its acid.

In this case,

The initial pH of the solution is 7.4, which means that the buffer is in its protonated form (the acid) at the start of the reaction.

When 10 micro mols of protons are generated, the buffer will lose protons and become the conjugate base. Therefore, the concentration of the conjugate base will increase and the concentration of the acid will decrease.

To calculate the final pH, we use the Henderson-Hasselbalch equation:

pH = pKa + log([conjugate base]/[acid])

We know that the pKa = 7.2, so the final pH will be equal to 7.2 + log([conjugate base]/0.1 - [conjugate base]).

To find the [conjugate base], we can use the stoichiometry of the reaction. We know that the reaction generates 10 micro mols of protons. We also know that the buffer has a 1:1 stoichiometry (1 acid: 1 conjugate base)

So [conjugate base] = 1010^-6 mol / 1 = 1010^-6 M

Therefore, the final pH = 7.2 + log(10*10^-6/0.1)

= 7.2 + log(10^-5) = 7.2 - 5 = 2.2

So the final pH of the solution would be 2.2

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The woven cloth is a good choice for modeling a cell membrane because cell membranes are semipermeable, which means some particles can cross the cell membrane while others cannot. Unlike the plastic bag, the woven cloth is semipermeable: for the woven cloth, small particles/liquids can pass through it while larger objects cannot. However, nothing is able to pass through the plastic bag, so the plastic bag is not semipermeable (it's impermeable).

Answer:

Li atoms readily give up one electron to form positively charged, Li+ ions. These ions have the same stable electron configuration as the noble gas helium. All Group 1 atoms can lose one electron to form positively charged ions.

Explanation:

I DON'T KNOW IF THIS IS THE RIGHT ANSWER BUT I'M TRYING TO JUST ANSWER.

Answer:

Explanation:

-We know that an atom is table if they have 8 valence electrons (like noble gases, they are stable)

-Group 1 atoms only has 1 valence electron, in order to become stable, they are desperately wanted to lose that one valence electron to become stable.

-While group 15 has 5 electrons, it is easier for them to gain 3 electrons to become 8 electrons than losing all 5 electrons.

-the same thing for group 16 has 6 valence electrons and 17 has 7 electrons. It is easier for them to gain 2 and 1 more valence electrons to become stable.

Hope this helps!

The magnitude of the electric force (F)on charge q₁ is (6.62 * 10^(-5) C)*E ,where E is electric field (E) between the plates.

The magnitude of the electric force on charge q₁ can be determined using the formula:

F = q₁ * E

where F is the magnitude of the electric force, q₁ is the charge, and E is the electric field.

To find the electric field between the plates, we need to use the formula:

E = σ / ε₀

where σ is the surface charge density and ε₀ is the permittivity of free space.

Given:

Area of the plates (A) = 2.34 * 10^(-3) m²

Charge on the plates (Q) = 7.07 * 10^(-7) C

The surface charge density (σ) can be calculated as:

σ = Q / A

σ = (7.07 * 10^(-7) C) / (2.34 * 10^(-3) m²)

Next, we can calculate the electric field (E):

E = σ / ε₀

where ε₀ is a constant, known as the permittivity of free space (ε₀ = 8.85 * 10^(-12) C²/(N·m²)).

Now, we have the electric field (E) between the plates.To find the magnitude of the electric force on charge q₁, we multiply q₁ by E:

F = q₁ * E

Given: Charge q₁ = 6.62 * 10^(-5) C

Substituting the values into the formula, we have:

F = (6.62 * 10^(-5) C) * E

Calculating the value of E and substituting it into the equation will give the magnitude of the electric force (F) on charge q₁.

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The concentration of the HCl solution needed to neutralize 25 mL of 0.2 M NaOH is 0.25 M

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

CaVa / CbVb = nA / nB

(Ca × 20) / (0.2 × 25) = 1

(Ca × 20) / 5  = 1

Cross multiply

Ca × 20  = 5

Divide both side by 20

Ca = 5 / 20

Ca = 0.25 M

Thus, the concentration of the HCl solution is 0. 25 M

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Tiana is developing a chemical additive to be used in swimming pools.

Chemical additives are substances added to products to alter or improve their performance. They are used in a wide range of consumer products and industrial processes for a variety of purposes including improving shelf-life, enhancing flavor, or increasing the efficiency of a process. Common examples of chemical additives are preservatives, colorants, emulsifiers, antioxidants, stabilizers, and thickeners.

This additive is designed to help keep the pool clean and sanitary, by removing bacteria and other contaminants from the water. The additive is also designed to help balance the pH of the pool water, to ensure that it is safe for swimming and does not irritate swimmers' skin or eyes. The chemical additive must also be safe to use, and must not cause any adverse reactions in swimmers. Tiana's work involves testing different chemical compounds to find the most effective and safe additive for pool water.

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Answer:

neutralise

Explanation:

There is a special name given to the reaction between an acid and a base to form salt and water and water only. That name is 'neutralization'. Hence to 'neutralize' an acid connotes the idea of 'cancelling' the effect of an acid.

An acid has a number of deleterious effects on surfaces, the most prominent of which is corrosion of the surface due to oxidation. If a surface is accidentally exposed to an acid, the effect of that acid on the surface can be counteracted by the immediate application of a base to 'neutralize' the acid. Neutralization in this sense is akin to 'cancelling' out the acid.

The examples are endless. Another common example is the neutralization of an acidic soil by a base in order to 'cancel' the acidity of the soil and make the soil fertile for plant growth.

Answer:

Explanation:

yes leon is correct because matter is anything that takes space and also has mass in it.

thks.

A chemical change occurs when there is a bond breaking or bond making. A phase change, change in phase and or change in shape does not make a chemical change. A chemical change can be indicated by the heat given off by a reaction or change. Thus, option a is correct.

There are broadly two types of change occurs for a substance namely chemical change or physical change. A physical change is a change in state or phase involves no formation products or breaking of bonds. For example melting of a solid to liquid and boiling of liquid to gas etc.

In a chemical change there makes a bond breaking or making to form a new product. All chemical reactions such as combination reactions, decomposition, displacements etc. are chemical changes.

Every chemical change is associated with an enthalpy of heat energy that is absorbed or released by the system. Thus heat given off is an indication of a chemical change. Hence, option A is correct.

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Answer:

An exothermic reaction is happening, it is absorbing the cold.

The salt will be dissolved into the water at 80℃.  At 80℃, the solubility of sodium chloride in water is approximately 39.2 g/100 mL. This means that in order for all of the salt to be dissolved into the water.

The solution would need to contain at least 140.1 g of water 55 g / 0.392 g/100 mL. However, in this case, the solution only contains 150 g of water. This means that there is not enough water present to dissolve all of the sodium chloride, and some of the salt will remain undissolved in the solution.

To determine if all of the salt will dissolve, we need to find the solubility of sodium chloride in water at 80℃. The solubility of sodium chloride at 80℃ is approximately 39 g of salt per 100 g of water.  Calculate the solubility of sodium chloride in 150 g of water.  39 g of salt per 100 g of water * 150 g of water / 100 g of water = 58.5 g of salt.

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Yes, all of the salt will be dissolved into the water at 80℃, based on the solubility of sodium chloride in water at that temperature and the amount of sodium chloride in the given solution.



According to the solubility curve for sodium chloride in water, the solubility of sodium chloride at 80℃ is approximately 127 g/100 mL. This means that at 80℃, 100 mL of water can dissolve up to 127 g of sodium chloride.

In the given solution, we have 150 g of water and 55 g of sodium chloride. To determine whether all of the salt will dissolve, we need to compare the amount of sodium chloride in the solution to the maximum amount that can dissolve in the given amount of water.

Since we have 150 g of water, we can calculate the maximum amount of sodium chloride that can dissolve at 80℃ as follows:

127 g sodium chloride/100 mL water x 150 mL water = 190.5 g sodium chloride

This means that at 80℃, 150 g of water can dissolve up to 190.5 g of sodium chloride. Since we only have 55 g of sodium chloride in the solution, we can conclude that all of the salt will dissolve into the water, since the solubility of sodium chloride at 80℃ is higher than the amount of sodium chloride in the solution.

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Answer:

11 protons

Explanation:

Answer:

11 protons

Explanation:

since it is neutral it has 11 electrons as well

a) T₂ = 266 K = -7°C using equation of state for an ideal gas.

b) we will get ΔS= -72.96kJ/K which is the change in entropy.

a) T₂, in K

The equation of state for an ideal gas is expressed as PV = nRT,

where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is the absolute temperature of the gas.

Therefore, R = P₁V₁/n₁T₁ = P₂V₂/n₂T₂ (where R is the universal gas constant and is equivalent to 8.314 J/mol.K)

The work accomplished during this operation is W = -528 kJ

Let's do the calculations now. W = nCv (T₂ - T₁) (where Cv is the heat capacity at constant volume)0.528 kJ/kmol.

K = 1.987 J/mol.K (for N2 gas, Cv = 20.785 kJ/kmol.K)

T₂ = 266 K = -7°C

(b) the change in entropy, in kJ/K.

The change in entropy is determined by the following formula:

ΔS = nCv ln(T₂ / T₁) + R ln(V₂ / V₁)ΔS = -132.8 kJ / 1.987 J/mol.K ln(T₂ / 278 K) + 8.314 J/mol.K ln(1 / 0.25)ΔS = -72.96 kJ/K

After we solve the equation we will get ΔS= -72.96kJ/K which is the change in entropy.

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B. Al. Al(Aluminium) is the limiting reactant because it is used up first in the reaction.

Aluminium is a silvery-white, lightweight metal that is the third most abundant element in the Earth’s crust. It is a strong and durable metal that has a wide range of applications, from construction and transportation to packaging and electronics. Aluminium is also non-toxic, non-magnetic and non-sparking, making it an ideal material for a variety of uses. Aluminium is also corrosion-resistant, which makes it ideal for outdoor applications.From the reaction \(2 Al + 3 CuBr_2\rightarrow 2 AIBr_3 + 3 Cu\). Since three moles of Al are combined with three moles of \(CuBr_2\), there are more \(CuBr_2\) molecules than Al molecules available for the reaction. This means that once all of the Al has been used up, there will still be some \(CuBr_2\) left over. Therefore, Al is the limiting reactant.

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Find the number of moles, we divide the given mass (125 g) by the formula mass (262.9 g/mol):  125 g / 262.9 g/mol = 0.475 mol, However, we need to multiply this by the number of phosphorus atoms in one formula unit of magnesium phosphate.

In one formula unit of mg3(po4)2, there are 2 atoms of phosphorus.
Therefore, the total number of phosphorus atoms in 125 g of magnesium phosphate can be calculated as: 0.475 mol x 2 atoms/mol = 0.950 atoms .

Calculate the number of moles of Mg3(PO4)2 in 125 g:
moles = mass / molar mass = 125 g / 262.9 g/mol = 0.475 moles
2. Determine the number of moles of phosphorus (P) in Mg3(PO4)2:
Mg3(PO4)2 has 2 moles of P per 1 mole of the compound, so 0.475 moles Mg3(PO4)2 × 2 moles P/1 mole Mg3(PO4)2 = 0.95 moles P
3. Calculate the number of atoms of phosphorus:
atoms = moles × Avogadro's number = 0.95 moles P × 6.022 x 10^23 atoms/mol = 1.43 x 10^23 atoms P.

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To answer this question, there are approximately 5.72 x 10^23 atoms of phosphorus in 125 g of magnesium phosphate.

we first need to find the molar mass of magnesium phosphate. The formula mass given in the question is 262.9 g/mol.
Now, we can use the formula mass to find the number of moles of magnesium phosphate in 125 g of the compound.
Moles of Mg3(PO4)2 = mass / molar mass
Moles of Mg3(PO4)2 = 125 g / 262.9 g/mol
Moles of Mg3(PO4)2 = 0.4754 mol
Next, we need to determine the number of moles of phosphorus in this amount of magnesium phosphate. We can use the formula of the compound to determine the ratio of magnesium to phosphorus.
There are 2 phosphorus atoms in each molecule of magnesium phosphate, so we can multiply the number of moles of Mg3(PO4)2 by 2 to get the number of moles of phosphorus.
Moles of P = 0.4754 mol Mg3(PO4)2 x 2
Moles of P = 0.9508 mol P
Finally, we can use Avogadro's number (6.022 x 10^23) to convert the number of moles of phosphorus to the number of atoms of phosphorus.
Number of P atoms = moles of P x Avogadro's number
Number of P atoms = 0.9508 mol P x 6.022 x 10^23 atoms/mol
Number of P atoms = 5.72 x 10^23 atoms
Therefore, there are approximately 5.72 x 10^23 atoms of phosphorus in 125 g of magnesium phosphate.

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25 meters/second west is a speed quantity. 25 seconds is a time quantity. 25 km up is a distance quantity. 25 meters/second is a speed quantity. Therefore, options c, e, a and c are the correct options.

Speed is a unit used to describe how swiftly something moves in a certain direction. The distance travelled per unit of time is a scalar quantity that characterises the rate of motion. In the International System of Units (SI), metres per second (m/s) is the accepted unit for measuring speed. Speed does not define the direction of the motion; it merely reveals its magnitude. Velocity, a vector variable that combines both magnitude (speed) and direction, is the term used to define motion that is described in a particular direction.

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The type of reaction for the given equation is a double displacement reaction, where the sodium bicarbonate and citric acid react to form sodium citrate and carbonic acid. The carbonic acid then undergoes a decomposition reaction to produce water and carbon dioxide. This type of reaction is called a decomposition reaction.

The symbols inside the parentheses after the formula of the compounds represent the chemical structure of the molecule. In the case of citric acid, the parentheses indicate the presence of three carboxylic acid functional groups, which are responsible for its acidity.

The presence of these groups also allows for the reaction with sodium bicarbonate to occur, forming sodium citrate and carbonic acid. Overall, this reaction demonstrates the principles of acid-base chemistry and the importance of understanding chemical structures in predicting reactions.

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An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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Answer:

There are 0.311 moles of  gas in the tank

Explanation:

Complete question

A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 241 K. Find the number of moles of the gas

Solution

As we know

\(PV = nRT\)

where P is the pressure of the gas in atm

V is the volume in liters

n is the number of moles

R is the gas constant = 0.08206 L·atm/K·mol

and T is the temperature in Kelvin

Substituting the given values in above equation, we get -

\(1.71 * 3.60 = n * 0.08206 * 241\\n = 0.311\)

There are 0.311 moles of  gas in the tank