_______ assisted Anton Raphael Mengs with the iconography of his ceiling fresco, Parnasus, in the Villa Albani.

A) Johann Winckelmann
B) Cardinal Albani
C) Jacques Louis David
D) Joshua Reynolds

I believe that the answer is

A) Neutrons

I hope this helps you ^-^

Answer:

neutrons

Explanation:

Answer:

A

Explanation:

Answer:

The formula for the anhydrous compound that was part of the mixture called natron that was used by the Egyptians is Na2(CO3)10(H2O).

They use this compound for medicine, cookery, agriculture, in glass-making and to dehydrate egyptian mummies.

Compound of sodium carbonate and sodium bicarbonate was the name of the resulting hydrate that formed.

Q.1-

Given,

mass - 10grams

volume - 24 cm³

density = mass/volume

density = 10/24

density = 0.416 g/cm³

Q.2-

Given,

mass - 700grams

volume - 1100cm³

density = mass/volume

density = 700/1100

density = 0.6363 g/cm³

Number of moles of KOH present in solution is 3.75.

The term "mole" refers to a mole's atomic mass, which is expressed in grams. A mole is an element's gram-atomic mass, or mass.

The mole idea equates the mass of a single atom or molecule (measured in a.m.u.) to the mass (measured in grams) of a large collection of equivalent molecules.

To calculate moles of potassium hydroxide in 750 ml of 5.00 m of KOH solution -

Mathematically molarity  is expressed as,

Molarity =no. of molecules of solute/volume of solution

Given: Molarity of solution = 5.00 M

Volume of solution = 750 ml = 0.750 l

∴ 5 = no. of moles/0.750

∴ number of moles = 3.75

Hence, number of moles of KOH present in solution is 3.75.

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Two mole of ideal gas is compressed isothermal from 10 to 10,000 atmospheric pressure at 500 degree kelvin then the entropy change in the process is  -114.86 J/K

Ideal gas is the hypothetical gas composed of molecule which follow a some rules in that ideal molecule do not attract or repel to each other and here given data is

Ideal gas = 2 mole

Pressure = P₁ = 10

Pressure = P₂ = 10,000

Temprature = 500 degree kelvin

We have to calculate entropy change in the process =?

We know the entropy change

ΔS = cv ln(T₂/T₁) +nR ln (P₂/P₁)

For isothermal compression temprature constant,

ΔS = nR ln (P₂/P₁)

ΔS = 2×8.314×ln(10/10,000)

ΔS = -114.86 J K⁻

ΔS = -114.86 J/K

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The correct option is (a) 1,000,000ºK.

The temperature of the Sun's corona is most nearly equal to option (a) 1,000,000ºK. The corona is the outermost layer of the Sun's atmosphere and is composed of highly ionized gas. The temperature of the corona is much higher than the temperature of the Sun's visible surface (the photosphere), which has a temperature of about 5,500 ºC (or 5,800 ºK). The reason for the high temperature of the corona is still not fully understood, but it is thought to be related to the Sun's magnetic field and the transfer of energy from the Sun's interior to its outer atmosphere.

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The correct answer is a. Alpha radiation consists of positively charged particles called alpha particles, which are identical to helium-4 nuclei.

Beta radiation consists of high-energy electrons (beta particles) or positrons (positron emission). Gamma radiation consists of high-energy photons, which have no charge. Delta radiation is not a recognized type of nuclear radiation. Therefore, alpha radiation is the only option that has a positive charge associated with it.

Due to its relatively large mass and charge, alpha radiation has a very short range and is easily stopped by a sheet of paper or even the outer layer of human skin.

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Five observable properties for separating mixtures are particle size, colour, texture, shape, magnetic attraction.

Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated.

The mixtures can be separated by properties like particle size, colour, density, shape, magnetic attraction.

Sieving can be used to separate compounds based on particle size. Chromatography can be used to separate compounds based on colour as each colour would have differences in properties. Flotation can be used to separate compounds based on density like oil in water. Centrifugation can be used to separate compounds based on shape. Magnetic separation can be used to separate metals from non-metal compounds in a mixture.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

Boyle's law, named after the scientist Robert Boyle, states that at a constant temperature, the pressure and volume of a gas are inversely proportional to each other. This means that as the pressure of a gas increases, its volume decreases, and vice versa, as long as the temperature remains constant.

a. Using Boyle's law, which states that the product of the initial pressure and volume of a gas is equal to the product of its final pressure and volume at constant temperature.

P1V1 = P2V2

0.82 atm x 2.0 L = P2 x 1.0 L

P2 = (0.82 atm x 2.0 L) / 1.0 L = 1.64 atm

Therefore, the missing value is P2 = 1.64 atm.

b. Using Charles's law, which states that the volume of a gas at constant pressure is directly proportional to its absolute temperature.

V1/T1 = V2/T2

(250 mL)/T1 = (400 mL)/(298 K)

T1 = (250 mL x 298 K) / 400 mL = 186.5 K

Therefore, the missing value is T1 = 186.5 K.

c. Using Gay-Lussac's law, which states that the pressure of a gas is directly proportional to its absolute temperature at constant volume.

P1/T1 = P2/T2

(740 mm Hg)/T1 = P2/(298 K)

P2 = (740 mm Hg x 298 K) / T1

We also know that the initial and final volumes are not equal, so the gas is not isochoric (constant volume), and therefore we can't use Boyle's law.

Let's assume that the temperature is measured in Kelvin, so T1 = T2 + 273.15 K

P2 = (740 mm Hg x 298 K) / (T2 + 273.15 K)

P2 = (740 mm Hg x 298 K) / (0.8 L x 273.15 K / 0.55 L)

P2 = (740 mm Hg x 298 K x 0.55 L) / (0.8 L x 273.15 K)

P2 ≈ 460 mm Hg

Therefore, the missing value is P2 = 460 mm Hg.

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Answer:

A and D

Explanation:

Answer:

A & D

Explanation:

The most likely reason for the initial precipitate result when a student mixed two solutions believed to be HCl and HNO3 is due to contamination in one of the containers or lab equipment. This is the correct option.

HCl (hydrochloric acid) and HNO3 (nitric acid) are both strong acids and, when mixed, should not form a precipitate. They typically remain as a clear solution since no insoluble compounds are formed.

It's essential to consider that the student repeated the process twice in separate wells and did not observe any precipitate. This suggests that the initial contamination did not persist in the subsequent trials. Proper cleaning and handling of lab equipment can help prevent this issue in the future.

In summary, the initial precipitate result was most likely caused by contamination in either the containers or lab equipment. The absence of precipitate in the following trials supports this explanation. To avoid such issues, ensure that all lab equipment is properly cleaned and handled to prevent cross-contamination.

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Answer:

V' = 1.75 L

Explanation:

glitterfairy9870

6 hours ago

Chemistry

High School

a balloon containing 1,000L of gas at 50. C and 760 mmHg rises to an altitude where the pressure is 380mmHg and the temperature is 10. C, what is the new volume of the balloon (in L)?

PV/T =P'V'/T'

380 XFIRST, ALWAYS ALWAYS, ALWAYS CHANGE TEMP IN C TO TEMP IN K

50C =50+273K =323K

10C= 10+273 =283

now PV/T =P'V'/T')

so

760 X 1/323 = 380 X V'/283

so

V' =760 X1 X283/(323X380)

V' = 1.75 L

L

Answer:

Electrons are stored in different electron shells with the nucleus in the center. Depending on the size of the element, the electrons may need more shells, making the electrons further away from the nucleus.

Explanation:

Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.  the statement "electrons are always located close to the nucleus of an atom" is not really accurate.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.

Electrons always move in fixed orbit around the nucleus with a particular force. Electrons may or may not be close to the nucleus. Depending on the size of the element, the electrons may need more shells, making the electrons further away from the nucleus.

Therefore,  the statement "electrons are always located close to the nucleus of an atom" is not really accurate.

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To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

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Answer:

There are 30 neutrons in a single Fe2+ atom.

Answer:30

Explanation:

(i dont know if its correct i am in a rush,)

Number of neutrons = 56 – 26 = 30. Thus there are 30 neutrons in a single $F{{e}^{2+}}$ atom. Note: Neutron is generally a subatomic particle which is neutral in charge. Mass of the neutron is slightly greater than the mass of the proton.

Answer:

I think its "sunspots"

Explanation:

Answer: 107 grams

Explanation: got it right on the test

The mass of a sample of f NH₃ containing  3.80 x 10²⁴ molecules of  NH₃ is  107.27 grams.

A molecule is a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.

6.02214076 × 10²³  molecules constitute 1 mole of NH₃

3.80 x 10²⁴ molecules constitutes of = 6.31 moles

1 mole of NH₃ = 17 gm

11.19 mole will be = 17 X 6.31

= 107.27 grams

Therefore the mass of a sample of NH₃ containing 3.80 x 10²⁴ molecules of NH₃ is 107.27 grams.

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Answer:

AgNO₃

Explanation:

Ag = Silver

NO₃ = Nitrate

Answer:

Bacteria has 1 cell and An Animal has multiple cells.

Explanation:

Bacteria is a cell its self. While An Animal, It has multiple cells that create multiple tissues, and those tissues create multiple organs, those organs make up an organ system. After the Organ System, it's an organism.

Organism = Animal, Human, Ect.

Meanwhile, Bacteria is made up ONE CELL (bacteria it's self is 1 cell)

So the answer is "Bacteria has 1 cell and An Animal has multiple cells."

I hope this helped!! <33

The minimum energy needed to excite the rotation of an H2O molecule about an axis bisecting the HOH angle is 1.91 10^7 J.

The minimum energy needed to excite the rotation of an H2O molecule about an axis bisecting the HOH angle can be calculated using the moment of inertia. The formula for rotational kinetic energy is given by:
KE = (1/2) * I * ω^2
Where KE is the kinetic energy, I is the moment of inertia, and ω is the angular velocity. To find the minimum energy needed, we need to find the minimum angular velocity required to excite the rotation.
The moment of inertia given is 1.91 10^7 kg m^2. To find the minimum angular velocity, we can use the formula:
ω = sqrt(2KE/I)
Since we want to find the minimum energy, we can assume that the initial angular velocity is zero. So, we can rearrange the formula to solve for KE:
KE = (1/2) * I * ω^2
KE = (1/2) * I * (sqrt(2KE/I))^2
KE = I
Substituting the given value of moment of inertia, we get:
KE = 1.91 10^7 kg m^2

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Answer:

addition polymerization

Explanation:

In addition polymerization, the monomers are simply joined to each other to form a polymer having the same empirical formula as the monomer but of higher relative molecular mass. The monomers in addition polymerization are usually simple unsaturated molecules such as alkenes.

We can deduce the reaction to be an addition polymerization because of the the attachment of n to both the unsaturated monomer and the saturated polymer without the loss of any small molecule. If it was a condensation polymerization, there would have been an accompanying loss of a small molecule such as water.

Answer:

addition polymerization

Explanation:

other guy is right on edg. 2020

B.The potential energy the reactants have stored in molecular bonds

Answer:

Nitrogen is an inert gas — meaning it doesn't chemically react with other gases — and it isn't toxic. But breathing pure nitrogen is deadly. That's because the gas displaces oxygen in the lungs. Unconsciousness can occur within one or two breaths, according to the U.S. Chemical Safety and Hazard Investigation Board.

Answer:

because it is an insert gas and it is very dangerous for ear and our nose

The element that we can be able to use for the experiment in place of potassium is sodium.

We know that the elements that can be found in the same group does react in the same way. Now we know that we have to look about among the options so that we would be able to know element that is in the same group as potassium.

Given that both sodium and potassium are members of group 1, we have to look out for the element that element thus we have to select sodium.

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The percent daily value (%DV) of sodium consumed if you ate the whole can of soup is 94.6%

We need to know the recommended daily sodium intake to calculate the percent daily value (%DV) for sodium consumed when eating a whole can of soup. The %DV for nutrients is based on a 2,000-calorie diet, where the daily value for sodium is typically set at 2,300 milligrams (mg).

Given that a 1/2 cup serving of Campbell's Soup contains 870 mg sodium and there are 2.5 servings per can, we can calculate the total sodium content in the can:

870 mg/serving * 2.5 servings = 2175 mg

To determine the %DV, we divide the total sodium content by the recommended daily value and multiply by. 100:

(2175 mg / 2300 mg) * 100 = 94.6%

Therefore, if you ate the whole can of soup, you would have consumed approximately 94.6% of the %DV for sodium.

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Reactions tend to run to completion if a product precipitated as a solid. Option B is correct.

When one of the products is taken out of the reaction mixture, reactions frequently proceed to completion. If a product is precipitated as a solid, it is no longer in the reaction mixture and is effectively removed from the system. This drives the reaction to completion in order to produce more of the solid product.

On the other hand, the physical state of a product (high melting point, liquid, or ionic) does not necessarily affect the extent to which a reaction runs to completion. While a high melting point may make it difficult to remove the product from the reaction mixture, it does not necessarily prevent the reaction from reaching completion.

Hence, B.is the correct option.

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Sterilization can be achieved using various methods, including steam and pressure, dry heat, dry gas, or radiation. It is a crucial process used to eliminate all forms of microbial life from objects or surfaces.

Sterilization is a crucial process used to eliminate all forms of microbial life from objects or surfaces. One method of sterilization involves using steam and pressure. This technique, known as autoclaving, utilizes high-pressure steam to kill microorganisms effectively. Autoclaves are widely used in medical facilities, laboratories, and other industries where sterile conditions are necessary.

Another method of sterilization is through the use of dry heat. This process involves subjecting the objects to high temperatures for a specified duration to destroy microorganisms. Dry heat sterilization is commonly used for heat-resistant equipment, such as glassware and metal instruments.

Dry gas sterilization is another technique used to achieve sterility. It involves using sterilizing gases like ethylene oxide or hydrogen peroxide vapor to eliminate microorganisms. This method is often employed for sensitive materials or equipment that cannot withstand high temperatures or moisture.

Lastly, radiation sterilization utilizes ionizing radiation, such as gamma rays or electron beams, to kill microorganisms. This technique is commonly used for disposable medical supplies, pharmaceutical products, and certain types of food.

In conclusion, sterilization can be achieved using various methods, including steam and pressure (autoclaving), dry heat, dry gas, or radiation. Each method has its advantages and is chosen based on the nature of the materials being sterilized and the desired level of sterility.

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