if there is 80 μmol of the radioactive isotope 32p (half-life 14 days) at t = 0, how much 32p will remain at 5 days:

Answer:

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

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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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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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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Grams of Ca2+ present in solution is 0.24

What do you mean by replacement solution?

A replacement reaction can be defined as a reaction in which one element.

It can be expressed in the following manner

A+BC→AC+B.

In this  reaction, element A is a metal and replaces element B (also a metal) in the compound. For example when iron is added to a copper sulphate solution, it displaces the copper metal.

A double-replacement reaction exchanges the cations or the anions of the two ionic compounds.

2NaCl(aq)+F2(g)→2NaF(s)+Cl2(g).

Moles = 2 milli

= 2/1000*3 = 0.006

Grams of Ca2+ present in solution= 0.006*40 = 0.24

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The following statements is correct about the comparative first ionization energies of the atoms in the following set: Mg, P, Sr , Sb, Ga is that P has largest ionization energy than Sr.

The trend of ionization energy in the periodic table is when we move from left to right in the periodic in the period ionization energy increases. when we move down the group in the periodic table then the ionization energy decreases.

Thus, The following statements is correct about the comparative first ionization energies of the atoms in the following set: Mg, P, Sr , Sb , Ga is that P has largest ionization energy than Sr.

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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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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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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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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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If mass spectrometry data give its molecular mass of the compound as 410 u, then the empirical formula units in the molecular formula will be 10.

% mass of C in vitamin D present in the human body = 87.73 %

% mass of H in vitamin D present in the human body = 12.27 %

Molecular mass of the compound = 410 u

Empirical formula units in the molecular formula = ?

Calculate the empirical units of C and H

    empirical units = percentage / atomic weight

    empirical units of C = 87.73 / 12

    empirical units of C = 7.3

    empirical units of H = 12.27 / 1

    empirical units of C = 12.27

Divide the formula units by the least value and multiply by 3

    empirical formula units of C = 7.3 / 7.3 × 3

    empirical formula units of C = 3

    empirical formula units of H = 12.27 / 7.3 × 3

    empirical formula units of H = 5

So empirical formula units = C₃H₅

Calculate the empirical formula mass

    emperical formula mass = 3 × 12 + 5 × 1

    emperical formula mass = 41

Calculate the empirical formula units

    empirical formula units = molecular mass / empirical mass

    empirical formula units = 410 / 41

    empirical formula units = 10

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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 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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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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Al + Fe₂O3 → 2 Fe + Al₂O3 is a replacement  balanced equations.

2 Ag+S → Ag₂S - synthesis equation

CaCO3 → CaO + CO2​- decomposition equation

balance equation for the reactants and products are necessary to balance chemical equations.

Because a chemical equation must adhere to the principles of mass conservation and constant ratios, the same amount of atoms of each element must be present on two of the reactant and product sides of the equation.

The reactants and products of a chemical reaction are symbolically expressed in chemical equations using the appropriate chemical formulae. The portion of the chemical equation that is on the reactant side is to the left of the sign "," and to the right of the arrow symbol, respectively.

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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:

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.

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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When figuring out whether to place a double or triple bond you should always look at the number of valence electrons present as well as the number of bonds a central atom is likely to form. Another good way to know whether to use double or single bonds is to calculate the formal charge on each atom in the molecule.

What is Lewis structure of molecules?

Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that depict the interactions of atoms inside molecules as well as any lone pairs of electrons that may be present. Any molecule with a covalent link, as well as coordination compounds, can have a Lewis structure. Gilbert N. Lewis, who first described it in his 1916 article The Atom and the Molecule, gave the Lewis structure its name. Lewis structures add lines between atoms to represent shared pairs in a chemical bond, extending the idea of the electron dot diagram.

Hence, when figuring out whether to place a double or triple bond you should always look at the number of valence electrons present as well as the number of bonds a central atom is likely to form. Another good way to know whether to use double or single bonds is to calculate the formal charge on each atom in the molecule.

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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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To prepare a 1.72 m solution of nano3, the volume (in liters) which would you have to dilute 31.9 ml of 3.45 m NaNO3 is 63.9 ml.

This problem can be solved by using the concept of molarity.

Molarity is defined as the ratio of moles of solute to the volume of solution.

Mathematically,

Molarity = moles of solute / volume of solution

Given,

Concentration of NaNO3 = 3.45 m

Volume of NaNO3 = 31.9 ml

As we know that,

Concentration = mole / volume

By substituting all the values, we get

3.45 m = mole / 31.9

Mole = 3.45 × 31.9

Moles of NaNO3 = 110.05 mol

Moles of NaNO3 = 110.05 mol

Molarity of NaNO3 = 1.72 m

By substituting all the values, we get

1.72 m = 110.05 / volume

Volume = 110.05 / 1.72 = 63.9 ml

Thus, we concluded that to prepare a 1.72 m solution of nano3, the volume (in liters) which would you have to dilute 31.9 ml of 3.45 m NaNO3 is 63.9 ml.

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199,257.6 J of heat energy is required to raise the temperature of a 16.8 g block of silver from 600.°C to its melting point,961.8°C, and fully melt the sample at this temperature.

The heat required to raise the temperature of a 16.8 g block of silver from 600°C to its melting point, 961.8°C, can be calculated using the equation:  

Q₁ = mcΔT  

where Q is the heat required (in joules), m is the mass of the silver (in grams), c is the specific heat of silver (in joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).  

The heat required would be:  

Q₁ = (16.8 g)(0.240 J/g°C)(961.8°C - 600°C)  

Q₁ = 158,608 J  

The heat required to fully melt the sample at this temperature can be calculated using the equation:  

Q₂ = mΔHf  

where Q is the heat required (in joules), m is the mass of the silver (in grams), and ΔHf is the heat of fusion of silver (in joules per gram).  The heat required would be:  

Q₂ = (16.8 g)(88 J/g)  

Q₂ = 1,472 J  

To determine the heat energy with vaporization,

Q₃ = mΔHv

Q₃ = 16.8x2332

Q₃ = 39.1776 J

Therefore, the total heat required to raise the temperature of a 16.8 g block of silver from 600°C to its melting point, 961.8°C, and fully melt the sample at this temperature would be:  

Qtotal = Q₁ + Q₂ + Q₃

Qtotal = 158,608 J + 1,472 J + 39.1776

Qtotal = 199,257.6 J

Therefore, the heat energy required is 199,257.6J

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If pressure is held constant, the combined gas law would become [tex]v_1/t_1 = v_2/t_2[/tex]

If the volume is held constant, the combined gas law would become [tex]p_1/t_1 = p_2/t_2[/tex]

The combined gas law is a law that relates Boyle's law, Charle's law, and Gay-Lussac's law together in a single equation. The equation is expressed below:

[tex]p_1v_1/t_1 = p_2v_2/t_2[/tex]

Where [tex]p_1[/tex] is the initial pressure of gases, [tex]v_1[/tex] is the initial volume of gases, [tex]t_1[/tex] is the initial temperature of gases, [tex]p_2[/tex] is the final pressure, [tex]v_2[/tex] is the final volume, and [tex]t_1[/tex] is the final temperature.

If pressure is held constant, it means [tex]p_1 = p_2[/tex], the equation becomes:

[tex]v_1/t_1 = v_2/t_2[/tex]

If the volume is held constant, it means [tex]v_1 = v_2[/tex], the equation becomes"

[tex]p_1/t_1 = p_2/t_2[/tex]

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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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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.

Answer:

Oxygen reacts with the carbon anode to form carbon dioxide. Therefore, the anode gradually oxidizes. They must be replaced frequently, which increases the cost of aluminum production.

The bond formed between two nonmetals, which are usually very similar in their tendency to lose or gain electrons, is the covalent bond. This bond involves the sharing of one or more electron pairs between the two atoms.

What is covalent bond?

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. When the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

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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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Answer:

average kinetic energy

Explanation: