a carnot engine operates with a cold reservoir at a temperature of tl = 400 k and a hot reservoir at a temperature of th = 500 k. what is the net entropy change as it goes through a complete cycle

Answer:

Molar mass of ethanol C

2

H

5

OH = 12x2 + 1x6 + 1x16 = 46 g/mol

Mass = moles x molar mass

Mass of ethanol required = 1.2 x 46 = 55.2 g

Volume = mass/density

Volume required = 55.2/0.7893

= 70 ml

Answer: C. UVA rays cause premature aging and UVB rays cause burning

Explanation: Ultraviolet radiation causes DNA changes in the skin, leading to premature aging and skin cancer. There are three kinds of UV light: UVA light. This form of solar radiation damages skin at all levels—from the surface layer (epidermis) down deep into the dermis.

Answer:

I believe it may be-

1. Series

2. Parallel

3. Parallel

4. Series

Explanation:

In a series circuit, electricity only has one path to follow while a parallel circuit has more than one path to follow.

Answer:The two types of chemical bonds that atoms can form to achieve stability are called ionic bonds and covalent bonds. Does this help

Explanation:

1. Fluid compressibility (C): Fluid compressibility refers to the measure of how much a fluid's volume changes in response to a change in pressure.

2. Solution-gas/liquid ratio (SGLR): The solution-gas/liquid ratio represents the volume of gas dissolved in a given volume of liquid at a specific pressure and temperature.

3. Fluid formation volume factor (FVF): The fluid formation volume factor represents the ratio of the volume of a fluid at reservoir conditions (pressure and temperature) to its volume at surface conditions.

4. Fluid densities (ρ): Fluid densities refer to the mass per unit volume of a fluid.

5. Fluid viscosities (μ): Fluid viscosities represent the measure of a fluid's resistance to flow.

1.  Equation: C = -1/V * dV/dP

  Symbol: C

  Unit: 1/Pascal (Pa^-1)

  Correlation: The compressibility of fluids can vary depending on the fluid type. For ideal gases, the compressibility is inversely proportional to pressure.

2.Equation: SGLR = V_gas / V_liquid

  Symbol: SGLR

  Unit: Volumetric ratio (e.g., scf/bbl)

  Correlation: The solution-gas/liquid ratio is influenced by the pressure and temperature conditions, as well as the composition of the fluid.

3. Equation: FVF = V_reservoir / V_surface

  Symbol: FVF

  Unit: Volumetric ratio (e.g., bbl/STB)

  Correlation: The fluid formation volume factor depends on the composition and properties of the fluid, as well as the reservoir conditions.

4. Equation: ρ = m / V

  Symbol: ρ

  Unit: Mass per unit volume (e.g., kg/m^3)

  Correlation: Fluid densities can vary depending on the type and composition of the fluid. For example, water has a density of approximately 1000 kg/m^3.

5. Equation: No single equation; viscosity is measured experimentally using viscometers.

  Symbol: μ

  Unit: Pascal-second (Pa·s) or centipoise (cP)

  Correlation: The viscosity of a fluid is influenced by temperature and pressure. Different fluids exhibit different viscosities, ranging from low-viscosity fluids like water to high-viscosity fluids like heavy oil.

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The statement that describes how the visible energy from the Sun is different from the non-visible energy is: It has different wavelengths.Option 3 is correct.

Visible energy and non-visible energy from the Sun differ in terms of their wavelengths. Visible energy consists of a range of wavelengths that fall within the electromagnetic spectrum that can be detected by the human eye.

These wavelengths span from approximately 400 to 700 nanometers, with shorter wavelengths corresponding to violet and longer wavelengths corresponding to red light.On the other hand, non-visible energy includes wavelengths that are outside the visible spectrum, such as ultraviolet (UV), infrared (IR), X-rays, and gamma rays.

These non-visible energies have shorter or longer wavelengths compared to visible light.The different wavelengths of visible and non-visible energy determine how they interact with matter and how they are perceived by humans. While visible light is responsible for the colors we see, non-visible energy, with its distinct wavelengths, serves different purposes, such as heating (infrared) or causing chemical reactions (UV).Option 3 is correct.

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Answer:

Carbon

Explanation:

Carbon is the most important element to life. Without this element, life as we know it would not exist. As you will see, carbon is the central element in compounds necessary for life.

Answer:

Carbon is the most important element

Answer:Donates a hydrogen ion

Explanation:

The atmospheric pressure in the eye of a hurricane is found to be 24.3 in of mercury. The pressure in the eye of this hurricane is 0.812 atm.

To convert the atmospheric pressure from inches of mercury (inHg) to atmospheres (atm), you can use the following conversion factor:

1 atm = 29.92 inHg

Given that the atmospheric pressure in the eye of the hurricane is 24.3 inHg, you can now convert it to atm:

Pressure (atm) = Pressure (inHg) / Conversion factor

Pressure (atm) = 24.3 inHg / 29.92 inHg

Pressure (atm) ≈ 0.812 atm

Therefore, the pressure in the eye of the hurricane is approximately 0.812 atm.

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Answer:

To calculate the number of molecules in 12.3 moles of SO3, we can use the Avogadro's number, which is the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 atoms or molecules per mole.

To calculate the number of molecules in 12.3 moles of SO3, we can multiply Avogadro's number by the number of moles of SO3:

Number of molecules = Avogadro's number x moles of SO3

Number of molecules = 6.022 x 10^23 x 12.3

Number of molecules = 7.34 x 10^24

So there are approximately 7.34 x 10^24 molecules in 12.3 moles of SO3.

The balancing of the equations are as follows:

1. 2 Na + N₂ -> 2 NaN

2. H₃PO₄ + 3 KOH -> K₃PO₄ + 3 H₂O

3. N₂ + 3 H₂ -> 2 NH₃

4. Fe + HCl -> FeCl2₂ + H₂

5. Zn + 2 HCl -> ZnCl₂ + H₂

6. CH₄ + 2 O₂ -> CO₂ + 2 H₂O

7. H₂S + CuSO₄ -> CuS + H₂SO₄

8. 2 NH₄ + + 2 NO₃ - -> N₂ + 4 H₂O

Chemical balancing, also known as chemical equation balancing, is the process of adjusting the coefficients in a chemical equation to ensure that the same number of each type of atom is present on both the reactant and product sides of the equation. In other words, chemical balancing ensures that the law of conservation of mass is satisfied for the given chemical reaction

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The amount of mercury at 200.0 ppb is 0.478 tons of mercury.

The amount of mercury at 50.0 ppb is 0.1195 tons of mercury.

The question states that mercury is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb.

A typical power plant burns 2.39 million tons of coal per year.To calculate the amount of mercury at 50.0 ppb, we first need to convert ppb (parts per billion) to tons. We can do this by multiplying the concentration by the total amount of coal burned:50.0 ppb x 2.39 million tons = 0.1195 tons of mercury.

Therefore, the amount of mercury at 50.0 ppb is 0.1195 tons of mercury.To calculate the amount of mercury at 200.0 ppb, we can use the same formula:

200.0 ppb x 2.39 million tons = 0.478 tons of mercury.

Therefore, Overall, to calculate the amount of mercury in coal based on different concentrations, we can use the formula concentration x total amount of coal burned.

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Answer:

1.2 × 10^22 atoms.

Explanation:

Firstly, cations refers to the positively charged atom in the ionic compound, which is Na+.

Given the mass of NaCl as 1.17g, the number of moles of NaCl can be calculated this:

Molar mass of NaCl = 23 + 35.5

= 58.5g/mol

Mole = mass/molar mass

Mole = 1.17/58.5

Mole = 0.02moles

Using Avagadro's number, 6.022 × 10^23 atoms of Na+ are in 1 mole of NaCl.

In 0.02 moles of NaCl, there are 0.02 × 6.022 × 10^23 of Na+

0.1204 × 10^23 atoms

1.2 × 10^22 atoms of Na+ (cation)

Answer:

the answer is c

Explanation:

i took the test

Answer: A plant-based diet requires less water to produce the food as it suppress all animal based products. In addition to consuming a lot of water to produce meat , livestock farming also pollutes water source because of the waste produced by the livestock ends up in waterways.

Explanation:

Answer:

I'm doing this so you can give smithpaige347 Brainliest

Explanation:

Answer:

The new volume is 5.0L

Explanation:

Given:

Initial pressure (P₁) = 1.4 atm

Initial volume (V₁) = 2.3 L

Final pressure (P₂) = 0.65 atm

We'll use Boyle's Law:

P₁V₁ = P₂V₂

Substituting the given values:

(1.4 atm)(2.3 L) = (0.65 atm)(V₂)

Now, let's solve for V₂:

V₂ = (1.4 atm * 2.3 L) / 0.65 atm

Calculating this expression step-by-step:

V₂ = (3.22 atm·L) / 0.65 atm

V₂ ≈ 4.953 L

Rounded to one decimal place, the new volume is approximately 5.0 L.

Answer: right here

Explanation:

A compound is a substance made up of a definite proportion of two or more elements. A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.

Answer:

C. Burning a log in a fireplace

Explanation:

Chemical energy is stored in the bonds between atoms and molecules and can be converted into another form of energy. This can occur through chemical reactions, such as combustion or decay.

An example of chemical energy being converted into another form is option C: Burning a log in a fireplace. In this example, the chemical energy stored in the wood is released through combustion, producing heat and light. The heat energy is then transferred to the surrounding air and environment, warming it up.

This is different from options A and B, which involve physical changes but not the conversion of chemical energy. Option D, a roller coaster going downhill, is an example of potential energy being converted into kinetic energy, but not of chemical energy being converted.


ALLEN

Answer:

I think it has ph level of 7.0

Answer:

C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(g)

Explanation:

The burning of propane is simply called Combustion of propane.

When an organic compound under goes Combustion, carbon dioxide, CO2 and water, H2O are produced respectively.

Thus, the burning of propane will yield the following:

C3H8(g) + O2(g) —> CO2(g) + H2O(g)

Now, let us balance the equation. This is illustrated below:

C3H8(g) + O2(g) —> CO2(g) + H2O(g)

There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 3 in front of CO2 as shown below:

C3H8(g) + O2(g) —> 3CO2(g) + H2O(g)

There are 8 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of H2O as shown below:

C3H8(g) + O2(g) —> 3CO2(g) + 4H2O(g)

There are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by putting 5 in front of O2 as shown below:

C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(g)

Now, the equation is balanced.

During the cell cycle, compounds called cyclins increase and decrease in a regular pattern. They regulate the stages of cell division and growth.

Cell cycle development is regulated in element by way of the sequential pastime of various cyclins. The cyclins are regulatory subunits that bind, prompt and provide substrate specificity for their catalytic companion serine-threonine kinases, collectively called cyclin-established kinases.

Cyclins are a family of proteins that don't have any enzymatic interest of their personal however spark off CDKs through binding to them.

S cyclins are involved inside the induction of DNA replication and early stages of mitosis. Their stages upward push at the beginning of S phase and fall in early mitosis.

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In the diagram, the electrons are arranged in their respective energy levels or shells. The first shell contains 2 electrons (1s^2), the second shell contains 8 electrons (2s^2 2p^6), and the third shell contains 7 electrons (3s^2 3p^5).

Valence electron is a term to refer the electrons found in the highest main energy level (n)1​ of the atom,2​ being these responsible for the interaction between atoms of different species or between atoms of the same species.

According to the above, the electrons are arranged in their respective energy levels or shells. The first shell contains 2 electrons (1s^2), the second shell contains 8 electrons (2s^2 2p^6), and the third shell contains 7 electrons (3s^2 3p^5).

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Answer:

Scientists study Earth's interior by studying

seismic waves. Seismic waves are waves of energy that travel

through Earth.

Explanation:

The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

Answer:

The nonpolar covalent compounds are:

H2O (polar covalent)

NCl3 (polar covalent)

AuCl3 (ionic)

ClO2 (polar covalent)

SF4 (polar covalent)

SO3 (nonpolar covalent)

Answer:

no it's is false because an electron have negative charges and it is not inside the atom and it is found out side the nucleus