Number 14 please help.. chemistry

The energy in the ground state of the electron confined in a 10 nm box is approximately 10.89 eV, and the energy in the first excited state is approximately 43.56 eV.

To calculate the energy of an electron confined in a 10 nm box, we can use the formula for the energy levels of a particle in a one-dimensional infinite potential well:

E_n = (n^2 * h^2) / (8 * m * L^2)

where:

E_n is the energy of the nth energy level,

n is the quantum number of the energy level (n = 1 for the ground state),

h is the Planck's constant (6.626 x 10^-34 J·s),

m is the mass of the electron (9.10938356 x 10^-31 kg),

L is the length of the box (10 nm = 10 x 10^-9 m).

Let's calculate the energy in the ground state (n = 1) and the first excited state (n = 2):

For the ground state (n = 1):

E_1 = (1^2 * h^2) / (8 * m * L^2)

Substituting the values:

E_1 = (1^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2)

Calculating this expression will give us the energy in the ground state.

For the first excited state (n = 2):

E_2 = (2^2 * h^2) / (8 * m * L^2)

Substituting the values:

E_2 = (2^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2)

Calculating this expression will give us the energy in the first excited state.

Please note that the energies calculated will be in joules (J). If you prefer electron volts (eV), you can convert the results by dividing by the electron volt value (1 eV = 1.602 x 10^-19 J).

Performing the calculations:

For the ground state:

E_1 = (1^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2) ≈ 1.747 x 10^-18 J

For the first excited state:

E_2 = (2^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2) ≈ 6.987 x 10^-18 J

Converting the energies to electron volts (eV):

E_1 ≈ 10.89 eV (rounded to two decimal places)

E_2 ≈ 43.56 eV (rounded to two decimal places)

Therefore, the energy in the ground state of the electron confined in a 10 nm box is approximately 10.89 eV, and the energy in the first excited state is approximately 43.56 eV.

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Answer:

It seems believable and familiar.

Explanation:

Plz mark Brainlest

Substances that heat up quickly normally have low specific heat capacities.

The specific heat capacity of a substance is the amount of energy required to raise the temperature of a given mass of the substance by one degree Celsius.

It is usually measured in joules per kilogram per degree Celsius (J/kgK).it is an important physical property of a material, as it determines the amount of energy required to change its temperature.

It is also useful for calculating the amount of energy required to heat or cool a given mass of the material. The specific heat capacity of a substance is related to its molecular structure and composition, as well as its phase.

For example, the specific heat capacity of liquids is generally higher than that of solids, and the specific heat capacity of gases is higher than that of liquids.

Additionally, the specific heat capacity of a substance can vary with temperature, pressure, and other environmental factors.

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The pH of the solution prepared by dissolving 2 aspirin tablets in enough water to make a 200 mL solution is approximately 2.44.

Acetylsalicylic acid (ASA) is a weak acid and will partially dissociate in water to form its conjugate base (acetylsalicylate ion) and hydronium ions (H+). The dissociation equation for ASA in water is:

ASA + H2O ⇌ H3O+ + A-

where ASA is acetylsalicylic acid and A- is the acetylsalicylate ion.

The equilibrium constant expression for this dissociation reaction is:

Ka = [H3O+][A-] / [ASA]

where Ka is the acid dissociation constant for ASA.

To determine the pH of the solution, we need to first calculate the concentration of the acetylsalicylic acid and the acetylsalicylate ion in the solution.

The number of moles of acetylsalicylic acid in 2 tablets can be calculated as:

n(ASA) = (2 tablets)(325 mg/tablet) / (180.16 g/mol) = 3.61 x 10^-3 mol

The total volume of the solution is 200 mL, which is equal to 0.2 L. Therefore, the concentration of ASA in the solution is:

\([ASA] = n(ASA) / V = 3.61 x 10^-3 mol / 0.2 L = 0.018 M\)

Assuming that all of the ASA dissociates into H3O+ and A-, the concentration of H3O+ and A- will be equal to each other and can be calculated using the equilibrium constant expression:

Ka = [H3O+][A-] / [ASA]

\([H3O+] = [A-] = sqrt(Ka x [ASA]) = sqrt(3.3 x 10^-4 x 0.018) = 3.61 x 10^-3 M\)

Finally, we can calculate the pH of the solution using the definition of pH:

\(pH = -log[H3O+] = -log(3.61 x 10^-3) = 2.44\)

Therefore, the pH of the solution prepared by dissolving 2 aspirin tablets in enough water to make a 200 mL solution is approximately 2.44.

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Answer:

No element shares the same atomic number. The atomic number of every element is unique to itself, just like a fingerprint is unique to a human. The atomic number of element allows us to identify it, like how we can identify a person from their fingerprint.

Explanation:

The number of H2 and O2 molecules needed should be 4 and 2.

We know that the water i.e. H2O that comprise of 2 hydrogen and 1 oxygen so in the case when we have to make 4 water molecules so it needed 8 hydrogen and 4 oxygen

So for H2 it needs 4 and for O2 it needs 2

Therefore, The number of H2 and O2 molecules needed should be 4 and 2.

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Answer: Oxaloacetate

Answer:

Oxaloacetate

Explanation:

At the end of this series of reactions, the four-carbon starting molecule, oxaloacetate, is regenerated, allowing the cycle to begin again. In the first step of the cycle, acetyl CoAstart text, C, o, A, end text combines with a four-carbon acceptor molecule, oxaloacetate, to form a six-carbon molecule called citrate.

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The main intermolecular forces present in 2,4,6-trimethylpyridine molecules are London dispersion forces due to its nonpolar nature.

The type of intermolecular forces expected between 2,4,6-trimethylpyridine molecules are primarily London dispersion forces.

London dispersion forces are the weakest intermolecular forces and occur between all molecules, regardless of their polarity. They are caused by temporary fluctuations in electron distribution, resulting in temporary dipoles. These temporary dipoles induce similar temporary dipoles in neighboring molecules, creating attractive forces between them.

In the case of 2,4,6-trimethylpyridine, it is a nonpolar molecule, meaning it has no significant positive or negative charges. As a result, it does not have dipole-dipole interactions or hydrogen bonding, which are stronger intermolecular forces seen in polar and hydrogen-bonding compounds, respectively.

The London dispersion forces between 2,4,6-trimethylpyridine molecules are influenced by factors such as molecular size and shape. The more electrons a molecule has and the larger its size, the stronger the London dispersion forces.

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Answer:

it turns into a solid

Answer:

\(pH=14.2\)

Explanation:

Hello there!

In this case, according to the information in this problem, and considering these two bases are strong, it is necessary for us to calculate the total moles of OH ions as shown below:

\(n_{OH^-}^{from\ NaOH}=0.050L*1.0mol/L=0.050mol\\\\n_{OH^-}^{from\ Ba(OH)_2}=0.050L*1.0mol/L*2=0.10mol\\\\n_{OH^-}^{tot}=0.15mol\)

Now, the as the solutions are additive, the total volume is then 0.100 L and the concentration:

\([OH^-]=\frac{0.15mol}{0.100L}=1.5\)

And therefore, the pH is:

\(pH=14+log(1.5)\\\\pH=14.2\)

Regards!

The empirical formula, which represents the simplest ratio of atoms in a compound, may be useful in the lab setting but not useful for predicting the properties and functions of materials.

In the lab, the empirical formula can be useful for identifying the composition of a compound, especially if the molecular formula is unknown. It can also help in determining the stoichiometry of a reaction, which can be important for conducting experiments. However, the empirical formula does not provide information about the actual number of atoms or the arrangement of atoms within a molecule, which can greatly affect the properties and functions of a material.

Therefore, while the empirical formula can be a useful tool in the lab setting, it may not be sufficient for predicting the properties and functions of materials. More detailed information about the molecular formula and structure is needed for accurate predictions.

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Since the molecular weight of water is about 18 g/mol, you have about 1 mol of water. So, now we know that it takes approximately 46.2 kJ of heat energy to warm 18.02g of water from 25C to 100C and then to vaporize it into steam. Hopefully this helped!

Explanation:

Answer:

it would decrease [h+]

Explanation:

 This is due to  neutralization If a base is added to an acidic solution, the solution becomes less acidic and its position changes to the middle of the pH scale.

hope this helps

Answer:

Raise the pH

decrease [H+]

Explanation:

=> Adding base would raise the pH (Bases have more pH and Acids have less pH)

=> Adding base would decrease the concentration of [H+] ions as it contains hydroxyl ions which neutralized with H+ ions so as a result the concentration of [H+] ions decreases.

Answer:

The four substances recycled during photosynthesis and respiration are carbon dioxide, water, oxygen, and glucose.

So because you don't have all these choices, just pick, carbon, hydrogen, and oxygen, which is the last answer.

Thanks!

Mark me brainliest!

~\(MiniMeteorologist\\\)~

Answer:

carbon hydrogen and oxygen

Explanation:

Answer:

B

Explanation:

Answer:

ipotseeeeeeeeeeeeeeee

Answer:

1.8066 x \(10^{24}\) people

Explanation:

One mole of any substance has 6.022 x \(10^{23}\) number of particles in it.

Using the ratio method:

   moles     :    people

        1          :   6.022 x \(10^{23}\)

         3        :     X

X = (3 x 6.022 x \(10^{23}\))

X = 1.8066 x \(10^{24}\) people

Answer:

5. The mass of Na₂CO₃, that will produce 5 g of CO₂ is approximately 12.04 grams of Na₂CO₃

6. The mass of nitrogen gas (N₂) that will react completely with 150 g of hydrogen (H₂) in the production of NH₃ is 693.\(\overline{3168}\) grams of N₂

Explanation:

5. The given equation for the formation of carbon dioxide (CO₂) from sodium bicarbonate (Na₂CO₃)  is presented as follows;

(Na₂CO₃) + 2HCl → 2NaCl + CO₂ + H₂O

One mole (105.99 g) of Na₂CO₃ produces 1 mole (44.01 g) of CO₂

The mass, 'x' g of Na₂CO₃, that will produce 5 g of CO₂ is given by the law of definite proportions as follows;

\(\dfrac{x \ g}{105.99 \ g} = \dfrac{5 \ g}{44.01 \ g}\)

\(\therefore {x \ g} = \dfrac{5 \ g}{44.01 \ g} \times 105.99 \ g \approx 12.04 \ g\)

The mass of Na₂CO₃, that will produce 5 g of CO₂, x ≈ 12.04 g

6. The chemical equation for the reaction is presented as follows;

N₂ + 3H₂ → 2NH₃

Therefore, one mole (28.01 g) of nitrogen gas, (N₂), reacts with three moles (3 × 2.02 g) of hydrogen gas (H₂) to produce 2 moles of ammonia (NH₃)

The mass 'x' grams of nitrogen gas (N₂) that will react completely with150 g of hydrogen (H₂) in the production of NH₃ is given as follows;

\(\dfrac{x \ g}{28 .01 \ g} = \dfrac{150 \ g}{3 \times 2.02 \ g} = \dfrac{150 \ g}{6.06 \ g}\)

\(\therefore \ x \ g= \dfrac{150 \ g}{6.06 \ g} \times 28.01 \ g = 693.\overline {3168} \ g\)

The mass of nitrogen gas (N₂) that will react completely with 150 g of hydrogen (H₂) in the production of NH₃, x = 693.\(\overline{3168}\) grams

Answer:

10 watts

Explanation:

Power = Work / Time

Power = 330 J / 33 s

Power = 10 watts

Answer:

Cotton Shirts

Explanation:

I would think that the cotton shirts would be more appropriate form of of clothing for summer.

Cotton has tiny pores that enable the sweat to evaporate off your skin, and hence keep you cooler. At the same time it absorbs this sweat, allowing easy evaporation. Synthetic fibers hold heat in, and do not allow sweat to evaporate.

It would be that Rana should buy cottons shirts for summer.

Answer:

D Earth's hot interior

Explanation:

The internal heat engine of the earth is the energy source that powers plate movement.

The sun drives the surface process and provides energy for the external heat engine

Therefore, the heat is used to melt rocks and set up convection currents that drives plate movements.

Answer:

Second graph is more reactive.

Explanation:

I just did the lesson myself, chose the first graph, and obviously got it wrong.

Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case.  Hope this helps.

Answer:

B

Explanation:

The answer is (e) 70 milliliters.

Let's assume that x milliliters of the 35% saline solution were used.

The total amount of saline in the solution can be calculated as follows:

Saline in 35% solution = 0.35 * x

Saline in 75% solution = 0.75 * 10 (since 10 milliliters of the 75% solution were used)

The total amount of saline in the resulting 40% solution can be calculated as:

Saline in 40% solution = 0.40 * (x + 10)

Since the saline is being mixed, the total saline in the resulting solution is equal to the sum of the saline in the individual solutions:

0.35 * x + 0.75 * 10 = 0.40 * (x + 10)

Simplifying the equation:

0.35x + 7.5 = 0.40x + 4

Subtracting 0.35x and 4 from both sides:

7.5 - 4 = 0.40x - 0.35x

3.5 = 0.05x

Dividing both sides by 0.05:

x = 3.5 / 0.05

x = 70

Therefore, 70 milliliters of the 35% saline solution were used. The answer is (e) 70 milliliters.

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Answer:

The parts of an atom are electrons, usually found in an electron shell around the nucleus of the atom, and protons and neutrons, found in the nucleus of the atom. Typically, electrons are gained or lost in order to obtain charge.