Reasons as to why the carbon electrodes require continual replacement

Learn mole concept to find the answer.

What is mole?

The mole, denoted by the symbol "mol," is the volume of a system that contains the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.

What is solid phosphorus pentachloride?

A crystalline solid with a pungent smell, phosphorus pentachloride is greenish-yellow in color. Water breaks it down into hydrochloric and phosphoric acid as well as heat. It's possible that this heat will ignite nearby combustible material.

2P(s)+5cl₂(gm)⇒2pcl₅(s)

2 moles of p react with 5 moles of cl₂

9.0 moles p react with moles of cl₂= 5 mol/2mol* 9.0mol

=22.5mol cl₂ (required mol of cl₂)

but we have 2.o mol of  cl₂ .

It needs  cl₂ is limiting reactant and p is presenting excess

as the reaction proceed according to the amount of limiting reactant

so, 5 mol of  cl₂  produce 2 mol of pcl₅

2.0 mol of cl₂  produce mol of pcl₅= 2 mol / 5mol*2.0 mol

=0.8 mol pcl5.

hence largest amount of pcl₅ that would be produced is 0.8

Therefore, 0.8 mol present in the pcl5.

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The wavelength when frequency is 2 x 10^6 s^-1 is 150 m.

What is wavelength?

The wavelength can be defined as the distance between any given point and the same point in the next wave which can be crest to crest or trough to trough. It can be represented by the symbol Lambda. It can be measured in the direction of the wave.

The wavelength can be calculated as,

A = c / v

where A is the wavelength, c is the speed of light and v is the frequency.

A = 3 x 10^8 m s^-1 / 2 x 10^6 s^-1 = 150 m.

Therefore, the wavelength of the wave with frequency 2 x 10^6 s^-1 is 150 m.

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Element may have more than eight valence electrons around it when present in a covalent compound is phosphorous

Valence electron are the electron located at the outermost shell of an atom and an atom like phosphorous or sulfur which has more than an octet is said to have expanded its valence shell and this can only occur when the valence shell has enough orbitals to accommodate the extra electron for example in the case of phosphorous the valence shell has a principle quantum number n = 3 and the maximum number of electron possible in the valence shell of the second row element is eight however the element of third row such as phosphorous and sulfur can form stable system by sharing eight or more electron

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The percentage purity of the chalk would be 88.82%.

The percentage purity of a compound is a measure of how pure the compound is.

In this case, the percent purity of the chalk is calculated as:

Percentage purity = mass of calcium carbonate/mass of chalk x 100%

From the equation of the reaction:[tex]CaCO_3 + 2 HCl --- > CaCl_2 + CO_2 + H_2O[/tex]

0.36 L of carbon dioxide was collected at STP.

Recall that: 1 mole of gas at STP = 22.4 L

Thus, 0.36 L of carbon dioxide at STP would be:

0.36/22.4 = 0.0161 mol

From the equation of the reaction, the mole ratio of carbon dioxide produced to calcium carbonate that reacted is 1:1. Thus, the equivalent mol of calcium carbonate that reacted would also be 0.0151 mol.

Molar mass of calcium carbonate = 100 g/mol

Mass of 0.0151 mol calcium carbonate = 0.0151 x 100

                                                                = 1.51 grams.

Percent purity of the chalk = 1.51/1.70 x 100

                                            = 88.82%

The percentage purity of the chalk is, therefore, 88.82%.

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The equilibrium constant for reaction 3 is K3 = K2K1.

The equilibrium constant is equal to the forward reaction rate constant divided by the reverse reaction rate constant. A mathematical ratio indicating product concentration divided by reactant concentration. Kp and Kc are the equilibrium constants of an ideal gas mixture.

Kp is the equilibrium constant used to express equilibrium concentrations at atmospheric pressure and Kc is the equilibrium constant used to express equilibrium concentrations in molar terms. The specific rate constant is a constant of proportionality that relates reaction rate to reactant concentration. So here both reactants and products are gases so only one reaction occurs with the same number of reactants and products.

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Nitrous oxide was first discovered by a French psychiatrist who was attempting to develop a sedative agent to treat schizophrenic patients. This statement is false.

What is Nitrous Oxide?

Nitrous oxide is a colorless, odorless chemical compound and non-combustible gas at normal room temperature.

It is generally known as 'laughing gas' and its molecular formula is N2O.

Other characteristics of this gas include sweet, gentle smell and and slight sweet taste.

Simply put, nitrous oxide is the least non-toxic gas that is used for inhalational anesthetic purposes.

However, there are some mild side effects including dizziness and unconsciousness which occur after inhaling gas.

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The statement which is not correct about Fuel is that wood does not burn.

Hence, option D is not correct

What do you mean by Fuel?

Fuel can be defined as any substance that upon combustion produces a usable amount of energy which is generally  known as fuel.The characteristics of good fuel includes that  it should have a high calorific value,  environment-friendly and should burn completely without leaving any residue. Fuel should be cheap and readily available. The burning of wood will include an indirect reaction.

Examples include : wood, coal, biogas, LPG, petrol, diesel etc.

Types of Fuels:

Hence, The statement which is not correct about Fuel is that wood does not burn.

Hence, option D is not correct

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The enthalpy change (in KJ) of the chemical reaction that raises the temperature of the solution by 2.40 °C is 8.976×10⁻³ KJ

We'll begin by obtainig the mass of the solution. This can be obtained as follow:

Mass = density × volume

Mass of solution = 1.25 × 250

Mass of solution = 312.5 g

Next, we shall determine the heat energy absorbed by the solution. This can be obataned as follow:

Q = MCΔT

Q = 312.5 × 3.74 × 2.4

Q = 2805 J

Finally, we shall detetrmine the enthalpy change. This can be obtained as follow:

Q = m × ΔH

2.805 = 312.5 × ΔH

Divide both sides by 312.5

ΔH = 2.805 / 312.5

ΔH = 8.976×10⁻³ KJ

Thus, the enthalpy change is 8.976×10⁻³ KJ

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The manufacturing process shown in the photograph is d)Separating.

The cutting process in metals is a process where a piece of metal is cut into a desired shape or size. This can be done using a variety of methods, but the most common method is using a cutting tool. This eventually lead to the separation of the metals

Cutting processes are operations in which the work piece is cut into smaller pieces using power-driven cutting tools. A variety of cutting processes are used in metalworking, including machining, broaching, sawing, shearing, and abrading.

Each process has advantages and disadvantages, and the best process to use depends on the work piece material, the work piece geometry, and the desired tolerances.

Through these tools, the metals could be cut and separated easily. Hence the correct answer is option d)

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Answer:

see picture

Explanation:

His name was announced as Roger Chillingworth. The jailer, after ushering him into the room, remained a moment, marveling at the comparative quiet that followed his entrance; for Hester Prynne had immediately become as still as death, although the child continued to moan.

–The Scarlet Letter,

Nathaniel Hawthorne

Does the author use direct or indirect methods to characterize Roger Chillingworth?

✔ indirect

Which method of indirect characterization does the author use to characterize Roger Chillingworth?

✔ Hester Prynne’s reaction

What inference can be made about Roger Chillingworth’s character based on Hester Prynne’s reaction?

✔ He is evil and intimidating.

The expected CO2 concentration will be around 400 ppm in 2100.

What do you mean by RCP?

RCP's can be defined as the Representative concentration pathway which is usually a  climate model to describe the different radiative forcing depending on the CO2 concentrations.

The above case studies states that:

The RCP 2.6 scenario is "rise and fall" scenario in which the radiative forcings will rise up to about 3.1W/m2 by 2050 and then decline to 2.6W/m2 by 2100. The CO2 concentrations are expected to be within 400 ppm in this model. Oceans will warm at a slower pace and most of the sea level rise is expected from melting of ice sheets.

Hence, The expected CO2 concentration will be around 400 ppm in 2100.

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The orange circle is the colored form that Gillian won't require for her version of the chain of electron transport.

Many physical processes, such as gravity, electrical interactions, weak interplay, electricity, magnets, chemistry, & thermal conductivity, depend on electrons.

A negatively charged particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of atoms within an atom is an electron that is bonded to it; the other two were protons and neutrons.

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The question is not scientific as it measures weight with a unit of mass.

Mass of water filling the flask =268.92 g - 93.667 g = 175.25 g . Molecular weight of the flask = 175.25 g / (1.00 g/cm^3) = 284.4 cm^3.

A given molecule's mass, expressed in daltons, is known as its molecular mass. Because different isotopes of an element are present in different molecules of the same compound, their molecular masses can vary. The mass of a substance per mole is its molecular weight. Typically, grams per mole are used to measure this. Molecular weight, also known as molecular mass, is the mass of a substance's molecules, based on 12 as the carbon-12 atom's atomic weight. In real life, it is calculated by adding the atomic weights of the atoms in the compound's molecular formula. The properties of a polymer are inversely correlated with its molecular weight. Mechanical properties typically increase as the molecular weight does.

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Atoms that have the same number of protons but different quantities of neutrons are called isotopes. Isotopes are several versions of the same element. As an illustration, the carbon isotopes 12 and 14 each have 6 and 8 neutrons, respectively.

Protons, neutrons, and electrons are the three subatomic particles that make up a normal atom (as seen in the helium atom below). There are other particles, such as alpha and beta particles (which are discussed below). The Bohr model presents the three fundamental subatomic particles clearly.

The nucleus, a small, dense region at the center of every atom, which is made up of nucleons, contains the majority of an atom's mass. Protons and neutrons are examples of nucleons. The protons in an atom's nucleus are the source of all of the atom's positive charge. Neutrons have no charge at all.

Isotopes can be created artificially by bombarding a stable nucleus with charged particles using accelerators or neutrons in a nuclear reactor, or they can be created naturally through the radioactive decay of a nucleus (i.e., emission of energy in the form of alpha particles, beta particles, neutrons, and photons).

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Answer:

380mmg

Explanation:

The option that is not a natural resource but must be produced artificially is concrete.

The term natural resources has to do with the resources tat we can be able to exploit from nature. The may be found on the surface as well as in the oceans and in the depth of the ground.

A lot of the natural resources can be processed and made into something that can be used to generate more money. Thus we have procedure like the processing of metals in order to obtain building materials and the processing of wood for timber.

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36.72 g water vapor, in grams, is produced when H₂S reacts completely at 2.0 atm and 290 K,

2H₂S(g) + O₂(g) → 2H₂O(g) + 2S(s)

volume=6.5 l

pressure= 2.0 atm

Temp=290 K

Gas constant, R= 0.0821 atm•L/mol•K T

Molar mass 2H₂S= 68

n= moles

PV=nRT

n=PV/RT

n= 2.0 atm ×6.5 l÷ 0.0821×290 K

n=13/23.78

n=0.54

n= given mass/molar mass

given mass=n × molar mass

given mass=36.72

Water that is gaseous rather than liquid is known as water vapour. Evaporation or sublimation are two processes that can be used to create it. Unlike clouds, fog, or mist, which are only suspended drops of liquid water in the atmosphere, water vapour is a gas and cannot be seen.

In the atmosphere, water vapor frequently exists below the boiling point. Boiling water causes the water to evaporate significantly more quickly and produce steam. Since water is boiling, steam frequently contains water droplets. This is known as wet steam because both water droplets and water vapor are present (also called wet vapor).

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P = 3.67 atm is the total pressure in the flask assuming that the initial pressure was 0 atm .

What is Ideal gas law ?

The ideal gas law (also called the perfect gas law), the relationship between the pressure P, volume V, and temperature T of a gas in the boundary region between low pressure and high temperature. Gas molecules move almost independently. each other .

PV = nRT, where n is the number of moles of gas and R is the universal (or perfect) gas constant, 8.31446261815324 joules/kelvin/mol (the universal gas constant is defined as Avogadro's number NA multiplied by Boltzmann's constant k) . ) In the International System of Units, energy is measured in joules, volume in cubic meters (m3), force in newtons (N), and pressure in pascals (Pa). where 1 Pa = 1 N/m2. A force of 1 Newton moving a distance of 1 meter does 1 Joule of work. Therefore, the product of both PV and nRT has the dimension of work (energy).

For He:  PV = nRT and n = PV/RT

n = (5.6 atm)(3.0 L)/(0.0821 Latm/Kmol)(298K) = 0.687 moles He

For Ne:  PV = nRT and n = PV/RT

n = (3.6 atm)(4.5 L)/(0.0821 Latm/Kmol)(298K) = 0.662 moles Ne

Total moles = 0.687 + 0.662 = 1.349 moles

PV = nRT

P = nRT/V

P = (1.349 mol)(0.0821 Latm/Kmol)(298 K)/9.0 L

P = 3.67 atm

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Learn ideal gas and temperature.

What is ideal gas?

In this situation, the ideal gas law, a state equation for all gases, holds true: The universal gas constant, 8.31446261815324 joules per kelvin per mole, and the number of moles of the gas, n, are used to calculate the potential energy, or PV, which is equal to nRT.

What is temperature?

The average kinetic energy of all the atoms or molecules in a substance is what we refer to as the substance's temperature. A substance's constituent particles do not all possess the same kinetic energy.

Since the potential energy from intermolecular forces becomes noticeably less when compared to the kinetic energy of the particle and the size of the molecules becomes noticeably less when compared to the empty space between them, a gas behaves like an ideal gas at higher temperatures and lower pressures.

Therefore,  at both high and low pressures, gases adhere to the ideal-gas law.

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Must first be inspected in oil sample analysis, low pressure intake circuit for leaks. Correct asnwer: letter C.

Oil analysis helps prevent engine damage by identifying potential problems and addressing them before they cause major damage. By monitoring the health of your engine oil, you can avoid costly repairs and extend the life of your engine.

Some ways to prevent engine damage from occurring include:

Additionally, oil analysis can help identify potential problems early on, allowing you to take corrective action before major damage occurs.

The group of options with respect to the question, which of the following should be inspected first? Son:

A) Tribology

B) engine off, engine hot: syringe at mid-sump level

C)  low pressure intake circuit for leaks

D) thick film and boundary

Correct answer: letter C.

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The conditions that MUST be true when planning an investigation of a chemical reaction that produces a precipitate at least one product is insoluble in water is at least one product is insoluble in water.

A chemical reaction is a phenomenon in which two or more compounds react in a suitable medium such as water in order to form one or more product molecules. This process generates a precipitate when water is the surrounding media for insoluble compounds.

Therefore, with this data, we can see that a chemical reaction may involve the formation of a precipitate when the compound is insoluble.

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Learn about the physical and chemical changes.

What is chemical change?

One material changing into another, creating new materials with unique properties, or creating one or more new substances are all examples of chemical changes. As a result, it occurs when two substances combine to form a new substance.

What is physical change?

When a physical change occurs, the material affected by the change retains its structural integrity both before and after the change. Types of physical changes include those in texture, shape, temperature, and the state of the matter. A substance's texture can change without also changing how it feels.

Therefore, the demonstration is chemical change.

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Answer:

There are 2 modes in O2.

O2 is dioxygen.

Explanation:

Two oxygen atoms joined together for dioxygen.

Also, for reference, the prefix "di" means "two," "twice," or "double."

Using the formula v=3RTM, the RMS velocity of the a gas may be calculated as R=8.314J.

Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit & Celsius. Temperature shows the direction of the spontaneous movement of heat energy, i.e., from a hotter body to a cooler object (one at a lower temperature).

Based on the International Unit of Measure, K, represented by the symbol K, is the Si derived unit of heat. However, the Celsius and Centigrade scale is used to determine temperature throughout the majority of the world.

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Answer:

The subscript that needs to be added to the equation to make it balanced is 2.

To find the dating method, learn all the types of dating method.

What is electronic spin resonance method?

In the presence of a static magnetic field, electron spin resonance (ESR), a spectroscopic technique, can detect transitions between the energy levels of electron spins caused by electromagnetic radiation.

What is dating method?

A technique called radiocarbon dating offers precise age estimates for carbon-based materials that come from living things. 1. The amount of carbon-14 in a sample can be measured and compared to an internationally accepted reference standard to estimate its age.

Therefore, we can conclude that it is electronic spin resonance method.

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When more moles of gas are introduced into a rigid container the deviation from ideal behavior decreases.

According to ideal gas equation,

pV=nRT

n = number of moles of gas

P = pressure of the gas

V = volume of the gas

R = gas constant

T = temperature

Then,  

pV/nRT = 1

Therefore, compressibility factor is,

Z = pV/nRT = 1

For an ideal gas Z = 1 and for real gas, Z may be either greater than one or less than one.

From the equation of deviation from ideal gas behavior it is clear that,

n ∝ 1 / Z

Hence, When more moles of gas are introduced into a rigid container the deviation from ideal behavior decreases.

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Answer: If you are talking about waves, then that is because only one color gets reflected as all the others gets absorbed.

Explanation:

TL:DR

Light absorb sum other reflect.

Wave-Particle Duality theory states that all matter exhibits wavelike motion.

According to the Wave-Particle Duality theory, both particles and waves can have characteristics that are similar to one another. This definition is opposed to Newtonian physics or classical mechanics. De Broglie (1892-1987) put up a solution to this quandary in 1924. He believed that waves characterize all moving objects. He combined linear momentum with the Planck constant.

E = hv = hc/λ

so

λ=hcE........(1)

and

p = E/c = mv

(p is the momentum of the object, m is the object's mass, and v is the velocity of the object) so

E = mvc

Plug this into (1), we have

λ = hc/mvc = h/mv

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Atomic orbitals undergo hybridization, which results in new orbital forms and spatial orientations.

In the localized valence bond theory, a mathematical method known as hybridization is used to construct sets of equivalent orbitals that are correctly orientated to form bonds from atomic orbitals that are similar in energy but not equivalent. Because they are created by combining (hybridizing) two or more atomic orbitals from the same atom, these new combinations are known as hybrid atomic orbitals.

By combining the beryllium 2s orbital with any of the three degenerate 2p orbitals in BeH2, we can create two equivalent orbitals.

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