An electron is confined in a potential well of 1 Å width.
What is the energy difference between the third and first energy states?

Gold (atomic mass=197) is plated from a solution clauric acid H4UCl4, It deposits on the cathode. The time to deposit 0.50g of gold passing a current of 0.10 is 2.4 hour.

The movement of electrons through a wire is referred to as electric current. The number of charges that move through the wire per second is measured in amperes (amps).

One mole of gold require 3 mole electron

Mass of gold deposited = 0.50g

Molar mass of gold = 197g

No of mole of gold = 0.50g/197g

= 0.0025

No of electron required = 3 × 0.0025

= 0.0076

1mole of electron having the charge of 96485C

Therefore, Columns for 0.0076 mole of electron = 940.43C

0.1 A current means 0.1 Columbs per second

Therefore, time to deposit 0.50g of gold = 940.44/0.1

= 9404.4second

= 2.4 hour

Thus, the time to deposit 0.50g of gold passing a current of 0.10 is 2.4 hour.

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The energy value of olive oil is 42.37 kJ/g. The enthalpy from the olive oil is 52.198 kJ/mol.

The question isn't complete. A similar question is in the attachment. A calorimeter is a tool that use to measure heat energy according to the equation

Q = m × c × ΔT

The heat energy that release

Q = m × c × ΔT

Q = 390 × 4.184 × 14.8

Q = 24,150.048 J

Q = (24,150.048 ÷ 1,000) kJ

Q = 24.15 kJ

The energy value is the ratio between the heat energy and the mass. For this problem

The formula to calculate the enthalpy ΔH = Q ÷ n

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Enthalpy is the energy that travel through one object to the other when temperatures are different. Therefore, 31.4°C is the final temperature.

Enthalpy is the energy that travel through one object to the other when temperatures are different. Enthalpy passes from the hot to the cold object when two object  with different  temperatures are brought closer.

From one state to another, such as from solid to liquid, from such a solid to a vapour, from either a liquid to a vapour, either from one solid form to another, a substance can absorb enthalpy without increase in temperature.

q=m ×c×ΔT=m ×c×(T −Ti)

q=-m×c×ΔT= -75 ×4.18(T−95°C)

q=m×c×ΔT=150×4.18(T− 25°C )

-75 ×4.18(T−95°C) =150×4.18(T− 25°C )

final temperature=31.4°C

Therefore, 31.4°C is the final temperature.

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Significant figures are the meaningful digits in a number that convey its precision. In scientific and technical calculations, the number of significant figures is used to express the level of accuracy of a measurement or calculation.

a. 225.0 - 4 significant figures

c. 0.0003210 - 5 significant figures

b. 1000.0 - 4 significant figures

d. 0.0067 - 3 significant figures

e. 1,000,000. - 7 significant figures

f. 2.00001 - 5 significant figures

Rounding to three significant figures:

a. 15.9994 -> 16.0

c. 0.6654 -> 0.67

e. 87,550 -> 87,000

b. 1.0080 -> 1.01

d. 4885 -> 4,900

f. 0.027225 -> 0.0272

Arithmetic operations rounded to the appropriate number of significant figures or decimal places:

a. 77.981 x 2.33 = 182.0 (3 significant figures)

b. 4 x 0.0665 = 0.266 (3 significant figures)

c. 17.344.900 + 23.1 = 17.345 million (1 decimal place)

d. 9.80 - 4.762 = 5.038 (3 significant figures)

e. 3.9 x 6.05 x 420 = 9,658 (3 significant figures)

f. 14.1 / 5 = 2.82 (3 significant figures)

g. 1001 + 16.23 = 1017 (3 significant figures)

h. 424.5 + 2.8461 = 427.3 (3 significant figures)

i. 9.9 - 9.54 = 0.36 (2 significant figures)

j. 7.3778 - 0.000265 = 7.378 (4 significant figures)

k. (24.358)(6.4) = 155 (2 significant figures)

l. (48.6)(0.6959) = 33.7 (2 significant figures)

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The percent by mass of the nitrogen is  82.4%.

We have to note that the percent by mass can be obtained when we know the molar mass of the compound and that is the first thing that we would need to find in the problem that we have in the question that have been asked.

The molar mass of the compound is; 14 + 3(1) = 17 g/mol

The percent by mass = Mass of N/ molar mass * 100/1

= 14/17 * 100/1

= 82.4%

The nitrogen would have a percent by mass in the compound of about  82.4%

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Insulation is the process of constructing a barrier between hot and cold objects that prevents heat from transferring between them by either reflecting thermal radiation or reducing conduction and convection.

What reduces thermal energy transfer?

The prevention of heat transfer between surfaces that are in thermal contact or within a radiative influence zone is known as thermal insulation. In addition to using the right item forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.

Thermal insulation prevents heat from moving from one substance to another when they are in thermal contact.

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If the small amount of MnS is combined with the large amount of HCl, The mass of any excess reactants will also be included in this total is the mass of the beaker with the small amount of MnS(s) and HCl(aq) after reaction is 504.35g.

A balanced chemical equation is one that has the same number of atoms of each type in the reaction on both the reactant and product sides. In a balanced chemical equation, both the mass and the change are equal.

The balance chemical equation is as follows:

MnS(s) + 2HCl(aq) ⟶ MnCl₂(aq) + H₂S(g)

Thus, The mass of any excess reactants will also be included in this total the mass of the beaker with the small amount of MnS(s) and HCl(aq) after reaction is 504.35g.

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Answer:

What process formed this delta?

A.) erosion and deposition

Explanation:

You're welcome.

Answer:

Erosion and deposition

Explanation:

Erosion happens as a result of the washing away of the top soil and this usually goes along with the deposition of some particles; loose or fine, mainly sand. So yes, the answer is option a.

Answer:

7.77×10^4=77,700

Explanation:

10^4 is 10,000, since there are 4 zeros in 10,000, move the decimal in 7.77 4 spaces to the right.

1: 77.7

2: 777.

3: 7,770.

4 77,700.

Side note: This trick ONLY works with +/-10^x value. If the value is positive the decimal moves to the right, and if the value is negative the decimal moves to the left.

Example: 7.77×(-10)^3=.00777

(-10)×(-10)×(-10)=(-10)^3= -1000

1: .777

2: .0777

3: .00777

H-F is a dipole molecule.

H-F is a polar covalent molecule that exhibits dipole-dipole interactions. Because it contains an electronegative atom, F, which is bonded to a H atom, an H-bond exists between its molecules. Because of these H-bonds, -HF molecules exist in liquid form.

Because HF is a polar molecule, it exhibits both dispersion and dipole-dipole forces. However, hydrogen bonding is possible because a hydrogen atom is covalently bonded to a fluorine atom and the same hydrogen atom interacts with a fluorine atom on another HF molecule.

A polar bond exists between H and F. All other molecules have regular geometry and, as a result, have a zero dipole moment.

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The correct equation for impulse is FΔt. The third option.

In mechanics, the impulse is the amount of force applied to an object for a certain amount of time leading to a change in the momentum of the object.

The impulse is mathematically expressed as:

Impulse = FΔt

Where F is the amount of force applied in Newton and Δt is the changes in the time spent applying the force. In other words, impulse is the product of force in Newtons and time in seconds.

Thus:

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For the given reaction, increasing the volume of the reaction system will shift the equilibrium to forward reaction. Decreasing the pressure will shift the equilibrium to the reverse direction.

The state of a reaction at which, the back ward and forward reaction takes place in equal rates is called equilibrium state. According to Le -Chatlier's principal, if any disorder imbalance the system, the system will balance it and shift to a new equilibrium state.

When the volume of reactants is increased, the reaction changes to the forward direction in which the increased volume is decreased.  Hence, as the volume increases, forward reaction takes place.

When the pressure is decreased, the reaction will shift to the direction in which the number of moles of gas is increasing to increase the pressure. Here, the reactant side haves the 4 moles of gases and product side have 2 moles of gas.

Hence, decrease in temperature make a shift to the reverse reaction.

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Due to the fact that this is a generally used (unit)3, such as cubic centimeters, cubic inches, cubic feet, cubic meters, etc., volume is computed for three-dimensional objects and is therefore represented in cubic units or another format of writing cubic unit.

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The volume in liters of 3.14 kg of ethylene glycol is 2.8288 L

A measurement of three-dimensional space is volume. It is frequently quantified numerically by various imperial or US customary units, SI-derived units, or both.

To find the volume:

Ethylene glycol density is: 1.11 g/cm³

m= 3.14 kg = 3140 g

v= ? L

v= m/d

= 3140g/1.11 g/cm³

=2828.8 cm³

= 2.8288 L

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Answer:

The chalcogens are the elements that belong to group 16 of the modern periodic table (or the oxygen family). Chalcogens consist of five elements – oxygen, sulfur, selenium, tellurium, and polonium.

The chalcogens (ore forming) are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. Group 16 consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv).Explanation:

The total number of cation is 1 and the total number of anion is 1.

The positively charged particles are called as cation and the negatively charged particles are called as anions.

The number of atoms present in unit cell at corner are 4 red ( B cation ) 4 Blue (A cations)

Total number of cations at the corner = 8

1 atom at corner have 1/8th of its portion

8 atom have 1/8th × 8 atom = 1 atom

Number of cation = 1

Atoms at the edge contributes ¼ th portion

There are 4 anions at edges

Contribution from 4 anions

= 1 / 4 × 4

= 1

Total anions = 1

Total cations = 1

Thus, the total number of cation is 1 and the total number of anion is 1.

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Answer:

False

Explanation:

 In a chemical reaction, only the atoms present in the reactants can end up in the products.

No new atoms are created, and no atoms are destroyed.

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

The rate of a reaction is affected by several factors such as concentration, temperature, etc. except the magnitude of equilibrium constant. It is the Chemical kinetics that deals with the study of rate of reactions.

The rate of decrease in the amount of the reactants or the rate of increase in the amount of products is generally known as the rate of a reaction. It is usually expressed in the unit mol L⁻¹ s⁻¹.

The rate of a reaction is influenced by many factors like reactant concentration, temperature, presence of catalyst, intensity of radiations, etc.

In general, the increase in the concentration of the reactant, increase in the temperature of the system and the presence of a catalysts increases the rate of the reaction.

There is no relationship between the equilibrium constant and the rate of the reaction. The rate equation is given as:

Rate = k [ Reactant]ⁿ

Here k is the rate constant not the equilibrium constant.

The extent to which the reactants are changed into the products is given by the magnitude of equilibrium constant. It does not affect the rate of a reaction.

Thus the rate of a reaction is affected by all except magnitude of equilibrium constant.

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The number of atoms in 29.0grams of sodium, Na is 7.58 × 10²³ atoms.

The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number; 6.02 × 10²³.

no of atoms = no of moles × 6.02 × 10²³

According to this question, there are 29.0 grams of sodium (Na). The number of moles can be calculated as follows:

moles = 29.0g ÷ 22.99g/mol = 1.26mol

No of atoms = 1.26 mol × 6.02 × 10²³

no of atoms = 7.58 × 10²³ atoms

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The statement given above is true.

Use only synthetic fiber swabs that have tiny wire or plastic shafts and were created specifically for sampling nasopharyngeal mucosa. Avoid using swabs made of calcium alginate or those with wooden shafts since they may contain chemicals that render some viruses inactive and thwart molecular testing. Although an OP specimen is a valid specimen type, the CDC advises only collecting the NP specimen. To increase test sensitivity and reduce the usage of testing resources, merge both NP and OP specimens into a single tube if they are obtained.

Maintain proper infection control and use the recommended personal protective equipment (PPE), which includes an N95 or higher-level respirator (or face mask if a respirator is not available), eye protection, gloves, and a gown, for healthcare professionals taking samples from patients or working within 6 feet of patients suspected of having the SARS-CoV-2 virus.

Follow standard precautions for healthcare professionals handling specimens who are not actively involved in the collection (such as handling self-collected specimens) or who are not working within 6 feet of the patient. Whenever they are within a healthcare institution, healthcare personnel should always wear some sort of source protection, such as a face mask.

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Answer:

40.0L

Explanation:

The number of moles in 2.07 × 10²³ formula units of CaCl₂ is 0.34 moles.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

1 mole of any molecule = 6.023 × 10²³ molecules

1 mole of CaCl2 = 6.023 × 10²³ molecules

Therefore,

2.07 × 10²³ molecules of CaCl2 1 mole / 6.023 × 10²³

= 0.34 moles

Thus, the number of moles in 2.07 × 10²³ formula units of CaCl₂ is 0.34 moles.

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Mountains can evolve in a variety of ways over time. They are susceptible to erosion from rain and wind, as well as landslides caused by flooding. Volcanic activity causes some mountains to change. They may also change as a result of earthquakes and tectonic plate movement.

A volcanic eruption occurs when lava and gas are expelled from a volcano, sometimes violently. A 'glowing avalanche,' which occurs when freshly erupted magma flows down the sides of a volcano, is the most dangerous type of eruption.

The heat from the mantle plume melts and thins the crust, resulting in surface volcanic activity.

Thus, In figure 3 there are two images one is millions of years ago and another is present day image. In both the images mountains are different because of erosion from rain and wind, as well as landslides caused by flooding.

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3.26 mL of a solution of 18.4 M H2 SO4 would be required. Therefore, 3.26 ml of that concentrated stock solution is what we need, and it seems like that is the right answer.

Water has been removed from a concentrated liquid to increase its strength. Use honey or concentrated apple or pears juice sparingly to sweeten food. Synonyms: rich, concentrated, undiluted, and reduced More definitions of concentrated.

to guide or draw to a common core or goal: focus. one's attention, concentrate. The lenses concentrate light, which means to collect into one entity, mass, or force. Only a select few skilled hands had all the power.

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Using the van der Waal equation, the pressure exerted by 15.0 mol of carbon dioxide confined to a 3.00 L vessel at 56.0 C is 81.95 atm.

The van der Waals equation is given below as follows:

(P + a * n²/V²) (V - nb) = nRT

where:

P is pressure = ?

a = 3.59 L².atm/mol

b = 0.0427 L/mol.

V is volume = 3.00 L

n is the number of moles = 15.00 moles

R is molar gas constant = 0.0821 Latm/mol/K

T is the temperature in kelvin = (273 + 56) or 329 K

Substituting the values:

(P + 3.59 * 15²/3²) (3 - 15 * 0.0427) = 15 * 0.0821 * 329

(P + 89.75) = 171.7

P = 81.95 atm

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The amount of carbon dioxide produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide is 16 grams.

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Answer:

The ground state electron configuration of Sr (Strontium) is 1s22s22p63s23p64s23d104p65s2. This means that the electrons in the Sr atom occupy the lowest possible energy levels available to them. The electron configuration is written as a series of numbers and letters that indicate the number of electrons in each orbital. In this case, the first electron goes in the 1s orbital, the next two electrons go in the 2s orbital, the next six electrons go in the 2p orbital, the next six electrons go in the 3s orbital, the next six electrons go in the 3p orbital, the next ten electrons go in the 4s orbital, and the final two electrons go in the 5s orbital. When Sr is heated and its electrons are excited, they absorb enough energy to jump to higher energy levels. When these electrons then return to the ground state, they emit light of a specific frequency or color.