Write the first step of the mechanism for chlorination of benzene using curved arrows to show electron reorganization.

The number of moles of hydrogen that can be made from 4.89 x 10-22 atoms of iron is 6.65 x 10-26 moles H2.

Hydrogen is the most abundant element found in the universe. It is a colorless, odorless gas that is the lightest of all elements. Hydrogen has the symbol H and the atomic number 1. It is the most basic building block of all matter. Hydrogen is an important part of many molecules, including water (H2O), proteins, and fats. It is a key component of many fuels, including gasoline, natural gas, and propane. Hydrogen is used in the production of ammonia, methanol, and other chemicals. It is also used in fuel cells.

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Approximately 89.29 mL of D70 solution and 410.71 mL of SWFI to prepare 500 mL of D12.5W solution.

The preparation of medications for patients involves pharmacy technicians in a significant way. They could be in charge of compounding intravenous (IV) solutions as one of their duties. In this exercise, we must calculate the amount of D70 (dextrose 70%) and sterile water for injection (SWFI) required to prepare 500 mL of D12.5W (dextrose 12.5% in water).

To prepare 500 mL of D12.5W solution using D70 and sterile water for injection (SWFI), you'll need to follow these steps:

1. Use the formula: C1V1 = C2V2, where C1 is the concentration of the starting solution (D70), V1 is the volume needed from the starting solution, C2 is the desired concentration (D12.5W), and V2 is the desired volume (500 mL).

2. Plug in the values: (70)V1 = (12.5)(500).

3. Solve for V1: V1 = (12.5)(500) / 70 ≈ 89.29 mL.                                                                                                                                                                                         Volume of D70 needed = (12.5% x 500 mL) / 70%                                                                                                                                                                                                 Volume of D70 needed = (0.125 x 500 mL) / 0.70                               Volume of D70 needed = 89.29 mL                                            

This is the volume of D70 solution needed.

4. Subtract V1 from the desired volume to find the volume of SWFI needed:  Volume of SWFI needed = 500 mL - 89.29 mL

 Volume of SWFI needed = 410.71 mL                                                               ≈ 410.71 mL.    

In summary, you need approximately 89.29 mL of D70 solution and 410.71 mL of SWFI to prepare 500 mL of D12.5W solution.

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Answer:

Organic matter composted with earthworms, often known as vermicompost, has been demonstrated in studies to have disease-suppressing qualities. The earthworms loosen the soil and enrich it with humus. As a result, they are known as farmer's pals. They help the crops grow healthier and over the time have earned farmers trust.

Explanation:

Hope this helps in some way!

Explanation:

The balanced chemical reaction is "Fe2O3 + 3C → 2Fe + 3CO2", and the required data are needed to determine the variation of Gibbs standard free energy and the partial pressure of CO2 at 700°C.

a. The balanced chemical reaction for the reduction of hematite (Fe2O3) by carbon (C) at 700°C to form iron (Fe) and carbon dioxide (CO2) is Fe2O3 + 3C → 2Fe + 3CO2.

b. To determine the variation of Gibbs standard free energy (ΔG°) of the reaction at 700°C, specific data such as enthalpy (ΔH°) and entropy (ΔS°) values are required.

c. In order to calculate the partial pressure of carbon dioxide (CO2) at 700°C, assuming the activities of pure solid and liquid species are equal to one, additional data is needed, such as the specific values for ΔG°, gas constant (R), and the temperature (T).

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Answer:

A. Mechanical

Explanation:

Mechanical energy is the sum of an object's kinetic energy and potential energy, which are both energies of motion.

\(\boxed{\begin{array}{c|c|c|c|c|c|c}\boxed{\bf{Element}} &\boxed{\bf{Percentage}} &{\boxed{\bf{Atomic\:mass}} &\boxed{\bf{Constant\:in\:Sample}} &\boxed{\bf No\:of\:moles} &\boxed{\bf{Sample\:Ratio}} &\boxed{\bf{Sample\:whole\:no\:ratio}}\\ &&&&&& \\ \sf C &\sf 50.84 &\sf 12 &\sf 50.84g &\sf{\dfrac{50.84}{12}=4.2} &\sf {\dfrac{4.2}{3.6}=1.16} &\sf 1 \\ &&&&&&\\ \sf H &\sf 8.53 &\sf 1 &\sf 8.53g &\sf{\dfrac{8.53}{1}=8.53} &\sf{$\dfrac{8.53}{3.6}$}=2.37} &\sf 2 \\&&&&&&\\ \sf O &\sf 57.69 &\sf 16 &\sf 57.69g &\sf{\dfrac{57.69}{16}=3.6} &\sf{\dfrac{3.6}{3.6}=1} &\sf 1\end{array}}\)

Now

Empirical formula is

\(\\ \sf\bull\longmapsto C_1H_2O_1\)

\(\\ \sf\bull\longmapsto CH_2O\)

Answer:

Scientists develop knowledge by making observation about the natural world that may lead to a scientific question.

A scientific question may lead to a(n) hypothesis which can be tested.

The results of experimentation can lead to changes in scientific knowledge.

Explanation:

In the process of developing scientific knowledge, scientists carry out series of observations on what happens in the natural world. This helps them to develop scientific questions. These scientific questions drawn can then lead to hypotheses which are testable.

The testing process leads to experimentation. It is in this process that much scientific questions receive answers. Testing actually lies at the core of scientific inquiry for all scientists. Whatever hypothesis made must always be tested.

The result of the testing or experimentation brings changes in scientific knowledge.  

Answer:

Low Chemist

Explanation:

A scientific name that was given to only the nobleist of its time.

The significance of the Ronald Cotton case, that a person can be convicted without individual evidence. Therefore, option D is correct.

Evidence is something or information used to increase or decrease the likelihood that a fact exists. Evidence can be testimony, written materials, visual or audio recordings, DNA samples, or other physical artifacts.

In essence, evidence is utilized to support a claim made by people or organizations who think something is real or a fact. Evidence may also be used to debunk or dispute a fact or claim that others don't agree with or believe to be incorrect.

Thus, option D is correct.

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Answer:

fomula; ( x = mutiplacation btw)

% m/m = m(solute) / m(solution) x 100%

0.50g x 70% = m/m x 100%

0.5g x 70% / 100% = 3.5 g KI

(both % cancle each other)

Explanation:

heads up might be wrong i did it myself

The Ring of Fire also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. The majority of Earth's volcanoes and earthquakes take place along the Ring of Fire.

Volcanoes are associated with the belt throughout its length; for this reason, it is called the “Ring of Fire.” A series of deep ocean troughs frame the belt on the oceanic side, and continental landmasses lie behind. The Ring of Fire was formed as oceanic plates slid under continental plates. Volcanoes along the Ring of Fire are formed when one plate is shoved under another into the mantle – a solid body of rock between the Earth's crust and the molten iron core – through a process called subduction. The Ring of Fire is a string of volcanoes and sites of seismic activity, or earthquakes, around the edges of the Pacific Ocean. Roughly 90% of all earthquakes occur along the Ring of Fire, and the ring is dotted with 75% of all active volcanoes on Earth.

The fifth row of the periodic table corresponds to the fifth energy level (also known as the "n=5" energy level) in the atom.

In the context of atomic structure, each energy level represents a specific energy state or shell in which electrons can exist around the nucleus of an atom. The energy levels are labeled using a principal quantum number (n), with n = 1 corresponding to the first energy level (closest to the nucleus) and increasing with each subsequent energy level.

The fifth row of the periodic table consists of elements that have their outermost electrons occupying the fifth energy level. These elements have their valence electrons, which participate in chemical bonding and determine the element's chemical properties, located in the fifth energy level.

It's important to note that the periodic table is organized in a way that groups elements with similar electronic configurations and chemical properties together. Thus, elements in the same row generally have similar characteristics and exhibit periodic trends in their properties.

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Answer:

The weight of 3.45 moles of carbon dioxide has been 151.8 grams.

Moles can be calculated as the mass of solute present with respect to the molecular mass of the solute.

Moles can be expressed as:

Moles = \rm \dfrac{weight}{molecular\;weight}

molecularweight

weight

The molecular weight of carbon dioxide has been 44 grams/mol.

The given moles of carbon dioxide = 3.45 moles.

3.45 mol = \rm \dfrac{weight}{44\;g/mol}

44g/mol

weight

Weight of carbon dioxide = 3.45 \times× 44 grams

Weight of carbon dioxide = 151.8 grams.

The weight of 3.45 moles of carbon dioxide has been 151.8 grams.

Protons and neutrons are present inside the nucleus of an atom while electrons revolve around circular orbits.

What is Proton and Neutrons?

The atom is made up of the subatomic particles electron, proton, and neutron. The atom is made up of a core nucleus that has neutrons and protons in it. The nucleus is surrounded by electrons.

Neutrons are neutral, protons are positively charged, and electrons are negatively charged.

All atoms' nuclei include protons, which are subatomic particles with a positive charge. One proton has a positive charge. The quantity of protons in the element's nucleus determines its atomic number. Two up quarks and one down quark make up protons. The mass of it is 1.007277 amu (atomic mass units).

All atoms, with the exception of hydrogen, include neutrons, which are subatomic particles that are neutrally charged.

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Answer:

Fnet = 13920 Newtons

Explanation:

Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.

Mathematically, net force is given by the formula;

\( Fnet = Fapp + Fg\)

Where;

Given the following data;

Mass, m = 800 kg

Acceleration, a = 7.6m/s²

To find the applied force;

\( Fapp = ma\)

Substituting into the equation, we have;

\( Fapp = 800 * 7.6\)

Fapp = 6080N

To find the gravitational force;

We know that acceleration due to gravity, g = 9.8m/s²

\( Fg = mg\)

Substituting into the equation;

\( Fg = 800 * 9.8\)

Fg = 7840N

To find the net force;

\( Fnet = Fapp + Fg\)

Substituting into the equation, we have;

\( Fnet = 6080N + 7840N\)

Fnet = 13920 Newton.

Therefore, the net force experienced is 13920 Newton.

None of the carbonyl group is attached to hydrogen atoms.

A ketone is a group in which one carbonyl group is attached to two R ( the alkyl group).

And the group in which two hydrogen is attached to R is called as an aldehyde (formaldehyde). And when one hydrogen and one alkyl group is attached to R. It is called as acetaldehyde from the aldehyde family. Attachment of three and four hydrogens to the carbonyl group is not possible because in the carbonyl group the carbon makes a double bond with oxygen. So a maximum of two hydrogens can be attached to the carbon of the carbonyl. But in ketone, the carbons are attached to carbons, not hydrogens.

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Therefore the initial pressure of the system is 670 torr.

The heavy and very rare gas known as xenon (Xe) is a member of the periodic table's Group 18 (noble gases).The first noble gas discovered to really create chemical compounds was this one. Xenon is a gas that is more than 4.5 times heavier than air and has no flavour or smell. The face-centered cubic crystal structure that solid xenon belongs to implies that its molecules, which are made up of a single atom, behave like spheres packed as closely as possible. The Greek word xenos, which means "foreign" or "strange," is where the name xenon comes from.

Xenon is not used extensively in industry. It is utilised in ultraviolet light-producing high-pressure arc lamps, stroboscopic lamps, high-intensity arc-lamps for motion picture projection, and photographic flash lamps (solar simulators).

Boyle's Law P₁V₁ = P₂V₂. Substitute and rearrange to solve for P₁

The initial pressure of the system is P₁ = 500 torr (13.4 Lit)/ 10.0 Lit = 670 torr

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5.20 g / 40.00 g = 0.130 moles NaOH

molarity = moles of solute / liters of solution

M = 0.130 moles / 0.500 L

M = 0.260

b) 0.260 M

The molarity of the solution is 0.260M

Molarity is the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution. It is denoted by M.

Solution is a homogeneous mixture composed of two or more substances.

Molarity = Moles of solute / litres of solution

5.20g / 40.00g/mol = 0.130 moles NaOH

M = 0.130 moles / 0.500L

M = 0.260M

Hence, option 2 is the answer.

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The producer surplus for a landscaper who is hired to work for $50/hour but is willing to work for $4willing to work for $40/hour, but they are receiving $50/hour, which is $10/hour more than what they are willing to work for.

Producer surplus is defined as the amount that producers benefit by selling their product at a higher price than they would be willing to sell for. The difference between the actual price and the minimum price the producer would be willing to accept is the producer surplus.

the producer surplus of a landscaper who is hired to work for $50/hour, but is willing to work for $40/hour will be calculated. The producer surplus of a landscaper who is hired to work for $50/hour but willing to work for $40/hour is $10/hour. The landscaper is ing to work for. Producer surplus is the difference between the amount that the producer

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Answer:

0.897

Explanation:

The molarity of the potassium acetate solution given the data is 1.584 M

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of CH₃COOK = 19.4 / 98

Mole of CH₃COOK = 0.198 mole

Molarity = mole / Volume

Molarity of CH₃COOK = 0.198 / 0.125

Molarity of CH₃COOK = 1.584 M

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According to the question, a(n) index is an element’s numeric position within an array.

Numeric position is a system of referencing locations using numerical coordinates. It is often used in geography, engineering, and mathematics. Numeric position is most commonly expressed using two or three numbers, which identify the location in a two- or three-dimensional space, respectively. The first number usually represents the location on a horizontal plane, while the second number represents the location on a vertical plane. In some cases, a third number may be used to represent the location on a depth plane.

An array index is the numeric position of an element within an array. It is used to identify and access elements within an array. The first element in an array has an index of 0, the second element has an index of 1, and so on.

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Answer: Rubbing alcohol molecules have a polar and nonpolar part, which means they are able to form hydrogen bonds with water and therefore able to mix with it.

Explanation:

Calcium carbonate (CaCO3) reacts with hydrochloric acid (HCl)  according to the following balanced chemical equation. Therefore, 400 mg of Tums (containing 40.0% CaCO3 by mass) can neutralize 31.98 mL of 0.100 M HCl.

CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

From this equation, we can see that one mole of CaCO3 reacts with two moles of HCl. Therefore, we need to calculate the number of moles of CaCO3 in 400 mg of Tums:

mass of CaCO3 = 0.4 g × 0.4 = 0.16 g

number of moles of CaCO3 = mass / molar mass = 0.16 g / 100.09 g/mol = 0.001599 mol

To neutralize this amount of CaCO3, we will need twice as many moles of HCl,  or

number of moles of HCl = 2 × 0.001599 mol = 0.003198 mol

Now, we can use the concentration of the hydrochloric acid solution (0.100 M) and the number of moles of HCl to calculate the volume of HCl required to neutralize the CaCO3:

number of moles of HCl = concentration × volume

volume = number of moles of HCl / concentration = 0.003198 mol / 0.100 mol/L = 0.03198 L

Finally, we can convert the volume to milliliters:

0.03198 L × 1000 mL/L = 31.98 mL

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A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL

Density= mass/volume

Density = 15.2 g/ 43mL

Density = 0.35 g/mL

Question is to find density

Answer:

Explanation:

Overuse of antibiotics leads to bacteria's resistance against our drugs. This is increasing at an alarming rate and the reason is that overuse of antibiotics kills bacteria that lack the "resistance" gene or gene that can help them survive the antibiotics (similar is the case for insects that die to insecticides). But, some bacteria can have random mutations in their gene that can help them survive the antibiotic (similar is the case for some insects that can survive the insecticide), thus the surviving bacteria give rise to next generation of bacteria that are resistant to the given antibiotic (similar to how insects that survive the insecticide give birth to new insects that are resistant to insecticide too). Soon, every generation adds new antibiotic resistant bacteria (or new insecticide resistant insects in the case of insects) which is dangerous for all of life on this planet. Therefore, both are similar in the sense that new generations of these organisms will be resistant to our weapons against them.

Answer:

72.2 moles of water is spilled

Explanation:

as moles=mass/mr

so mr of water is 16+2=18

13000/18=72.2

for the second one you can work out the moles of o2

by using moles= number of particles /6.02*10^23

so 4.65*10^26/6.02*10^23

so i got 772.4 on my calculator  to work out the amount of mass

u use the equation mass=moles*mr

so 777.2*16=12435g of oxygen gas

hope it helps :)

Answer:

ask someone else I will help later

List of metal or alloy that is best-suited include :

1) Block of an internal combustion engine is made of grey cast iron because it is ductile and hard enough to bear the loads.

2) Steam heat exchanger is made up of stainless steel material as it has high resistance to corrosion and has the capacity to bear high-temperature differences.

3) For jet engine turbofan blades, titanium alloys are being used because they can able to bear high pressure and high energy loads.

4) Tool steel is used to make drill bit material as it has high tensile and point strength.

5) Aluminum alloys are used for cryogenic applications as it is the best suited for work at low temperatures.

6) Magnesium is used for pyrotechnics as it gives works on the effect of heat, light, and gas.

Alloy, a metallic substance composed of two or more elements, as both a compound or a solution. The components of alloys are ordinarily themselves metals, though carbon, a nonmetal, is an essential constituent of metal.

Alloys, in trendy, are more potent and harder, less malleable, much less ductile, and greater corrosion-resistant than the alloy's predominant metallic.

An alloy is created with the aid of mixing metallic with another issue, both any other metal or a nonmetal substance. Metallic alloys are commonly made by means of melting the substances, mixing them collectively, after which letting them cool to room temperature, ensuing in a strong material.

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