a solution containing a mixture of metal cations was treated as outlined. dilute hcl hcl was added and no precipitate formed. h2s h 2 s was bubbled through the acidic solution. a precipitate formed and was filtered off. the ph was raised to about 9 9 and h2s h 2 s was again bubbled through the solution. a precipitate formed and was filtered off. finally, sodium carbonate was added to the filtered solution and no precipitate formed. what can be said about the presence of each of these groups of cations in the original solution?

The given relative mass formula is correct. The weight in grams of the number of atoms of an element contained in 12.00 g of carbon-12 is known as the relative atomic mass of the element.

The ratio of an element's average atomic mass to the unified atomic mass unit is the relative atomic mass, or Ar. The average mass of an element's isotopes is used to calculate the relative atomic mass.

Absolute mass is the total mass of all protons and neutrons, whereas relative mass is the average atomic mass of all the isotopes present in a given percentage. As an illustration, the average atomic mass of carbon, calculated using the proportions of the isotopes C-12, C-13, and C-14, is 12.01 while the absolute mass of carbon is 12.0 amu.

An element's mass number is determined by the sum of its proton and neutron counts: Protons and neutrons together make up mass.

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Answer:

2. Periods

Explanation:

The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.

The name of the compound with the chemical formula Br2F8 is dibromo octafluorine.

The chemical formula of a compound shows the type and proportion of each element that makes up the chemical compound.

According to this question, a compound with chemical formula Br2F8 is given. The compound consists of the following:

Therefore, the name of the compound with the chemical formula Br2F8 is dibromo octafluorine.

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Answer:

D. It is supported by adequate data

Explanation:

A theory is a well-substantiated explanation

Hope this helps!

Have a great day. :)

If the starting materials in the Tandem Green Diels-Alder Reaction were not added in a 1:1 ratio, it would impact the proton NMR spectra of the reaction mixture by altering the relative intensities of the peaks associated with the different protonated species in the mixture.

This would make it more difficult to determine the extent of reaction or to confirm the formation of the expected product.

As for using a different diene with a melting point of 100°C in a solvent-free methodology, it is not possible to determine if the reaction would be successful without further information about the reactivity and stability of the new diene under the reaction conditions. Solvent-free reactions can be challenging due to the need to control reactivity and solubility, and the melting point of the diene may affect its solubility and reactivity. If the diene is not sufficiently soluble or reactive in the reaction mixture, it may not participate in the reaction, leading to low yields or no product formation.

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If the starting materials( (E,E)-2,4-hexadien-1-ol and maleic anhydride), in the Tandem Green Diels-Alder Reaction were not carefully added in a 1:1 ratio, but rather a 2:1 ratio, how would this impact the proton NMR? And If a different diene was used with a melting point of 100°C would you expect this reaction to be successful using a solvent free methodology?

Answer:

Tyre

In cold weather, you might have regularly kept a check on the pressure of the tyres of your car. Driving increases the temperature of the tyres, and, therefore, the air inside the tyre warms and expands. When you measure the pressure of the tyres at the time when you have just driven the car, it will be high. However, in cold weather, the pressure of the tyres will be low. So, it is recommended that you should always measure the pressure of the tyres.

Answer:

19 hydrogen bonds

Explanation:

Between every thymine and adenine, there are 2 hydrogen bonds.

Between every guanine and cytosine, there are 3 hydrogen bonds.

Since there are 2 total thymines and adenines, they contribute 4 hydrogen bonds overall.

-----> 2 H bonds x 2 nucleotides = 4 H bonds

Since there are 5 total cytosines and guanines, they contribute 15 hydrogen bonds overall.

-----> 3 H bonds x 5 nucleotides = 15 H bonds

Therefore, there are 19 hydrogen bonds between the complementary strands.

Substance which contains the fewest particles is urine whose specific gravity is  1.03 to 1.035.

Specific Gravity or relative gravity is a dimensionless amount that is characterized as the proportion of the thickness of a substance to the thickness of the water at a predefined temperature and is communicated as.

Specific gravity=Density of object/density of water.

Specific gravity has a great many applications, following are a couple of the applications:

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Answer:

Ernest Rutherford and Frederick Soddy were the radiochemist who explained radioactivity.

Together, Rutherford and Soddy discovered that radioactivity involved the spontaneous breakdown of atoms into smaller, more stable particles. Their work laid the foundation for many subsequent advancements in nuclear science.

Explanation:

Ernest Rutherford was a renowned New Zealand physicist and chemist who made significant contributions to the study of atomic structure and radioactivity.

He is often referred to as the "Father of nuclear physics".

Riding that wave of astounding discoveries, Rutherford rose to prominence as the forerunner of a new wave of British Empire explorers who preferred to explore the atom rather than get lost in the vastness of a continent. Rutherford used radioactivity, not a compass or a map, to provide a clear picture of what the atom looks like.

Frederick Soddy was a British chemist and radiochemist who worked alongside Rutherford and helped to develop the theory of isotopes.

Soddy was extremely concerned about how scientific advancements were being used. Soddy was among the first to criticise economic growth based on the use of fossil fuels for energy production, claiming that the system conflates riches with debt. At the time, his now-commonplace recommendations for overhauling the monetary system were neglected and disregarded due to their perception as unorthodox.

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Answer:

[;

Explanation:

Mudflows (geosphere) and flooding may occur downstream from volcanoes and may inundate streamside communities (biosphere).

False.

Radiation itself does not typically have a green glow, intense heat, crackling sound, or ammonia smell. These descriptions do not accurately represent the properties of radiation.

The emission of energy in the form of particles or electromagnetic waves is referred to as radiation. Our senses cannot immediately notice it. Radiation is measured and detected using specialized apparatus and detectors.

Alpha particles, beta particles, gamma rays, and X-rays are a few examples of different forms of radiation that have unique characteristics and may be identified with the right tools. For instance, ionizing radiation is typically detected using Geiger-Muller counters or scintillation detectors, whereas radiation exposure is measured using dosimeters.

For precise radiation risk identification and protection, it's crucial to rely on the right detection tools and follow safety procedures.

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Answer:

487 moles of CO2 is needed

Explanation:

What we need to use here is the ideal gas equation.

Mathematically;

PV = nRT

Since we are calculating the number of moles, we can rewrite the equation to be;

n = PV/RT

from the question, we identify the following;

P is the pressure at 150 atm

V is the volume at 80L

T is the temperature which is 27+273 = 300K

R is the molar gas constant which is 0.0821 L atm K^-1 mol^-1

Substituting these values, we have;

n = (150 * 80)/(0.0821 * 300) = 487.2 which is approximately 487 moles

Answer:

Thermodynamic spontaneity can be measured by changes in Gibbs free energy (ΔG). The reference point for whether a process will proceed in the forward or reverse direction is the sign of ΔG.

A negative ΔG indicates a spontaneous process that will proceed in the forward direction, while a positive ΔG indicates a non-spontaneous process that will proceed in the reverse direction.

Tendency of a process to occur without the need for external intervention is known as thermodynamic spontaneity. In other words, it describes whether any process can occur naturally or spontaneously under the specific given conditions and without requiring additional energy input.

The concept of spontaneity is related to the second law of thermodynamics, which states that entropy of isolated system increases increase over the time.

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Answer:

1-hexene. is your answer.

The name of the given alkene is Hex-1-ene

In order to name the given alkene, we will follow some of the IUPAC rules for naming alkenes. The rules are:

1. The longest chain chosen for the root name must include both carbon atoms of the double bond.

2.The root chain must be numbered from the end nearest a double bond carbon atom.

3. The smaller of the two numbers designating the carbon atoms of the double bond is used as the double bond locator.

The given alkene is

CH3CH2CH2CH2CH = CH2

The longest chain has 6 carbon atoms, which means it is a Hexene.

If numbered from the end nearest the double bond carbon atom, the double bond will be on carbon - 1

∴ Hex-1-ene

Hence, the name of the given alkene is Hex-1-ene

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Answer:

yo te diria que el elastico amigo es esa

The isomerization of cyclopropane to propylene is a first-order process with a half-life of 19 minutes at 500oc. The time it takes for the partial pressure of cyclopropane to decrease from 1. 0 atmosphere to 0. 125 atmosphere at 500oc is closest to 57 minutes.

First, we must get the rate constant.

k= 0.693/ 19 = 0.0365 min⁻¹

Now we need to figure out how long decay takes.

First order kinetics' expression for the rate law is provided by:

t= (2.303/k) log a/(a-x)

where,

Rate constant = k

t = time it took for decay to occur.

Initial reactant pressure equals 1.0 atm, or a.

After the process of decay, a - x equals 0.125 atm of pressure.

After entering all the values into the equation above, we get

t= (2.303/0.0365) log 1/(1-0.125)

t = 57 min

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C) As the intensity of a photon increases, the ability of that photon to eject an electron does not change. The relationship between the intensity of photons and the ejection of an electron can be explained by the photoelectric effect.

The photoelectric effect is the phenomenon in which electrons are ejected from a material when light is shone on it. According to the classical wave theory of light, the intensity of light is related to its amplitude, or the height of its wave. Therefore, one might expect that increasing the intensity of light would increase the energy of the electrons ejected from the material. However, the photoelectric effect could not be explained by the classical wave theory of light.
In 1905, Albert Einstein proposed that light had both wave-like and particle-like properties. According to his theory of the photoelectric effect, light was made up of particles called photons. Each photon had a certain amount of energy that was proportional to its frequency. When a photon was absorbed by a material, its energy was transferred to an electron in the material. If the energy of the photon was greater than the binding energy holding the electron to the material, the electron would be ejected from the material.

The answer to the multiple-choice question is A) As the intensity of a photon increases, the ability of that photon to eject an electron increases. This is because increasing the intensity of light increases the number of photons, and therefore the number of opportunities for a photon to transfer its energy to an electron. However, it is important to note that increasing the intensity of light does not increase the energy of individual photons, but rather the number of photons present.

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For the pH after the addition of each volume of acid, we need to consider the reaction between methylamine (CH₃NH₂) and HNO₃. Methylamine is a weak base, and HNO3 is a strong acid. The reaction can be written as:

CH₃NH₂ + HNO₃ -> CH₃NH₃+ + NO₃-

First, let's calculate the initial moles of methylamine in the 100.0 ml sample:

moles CH₃NH₂ = volume (L) * concentration (mol/L)

moles CH₃NH₂ = 0.100 L * 0.100 mol/L

moles CH₃NH₂ = 0.010 mol

Since CH₃NH₂ is a weak base, it will react with HNO₃ in a 1:1 ratio. Therefore, the number of moles of CH₃NH₂ reacting will be equal to the number of moles of HNO₃ added.

Now let's calculate the moles of HNO₃ added for each case:

a) 0.0 ml (no HNO₃ added): 0.010 mol

b) 20.0 ml: moles HNO₃ = 0.020 L * 0.250 mol/L = 0.005 mol

c) 40.0 ml: moles HNO₃ = 0.040 L * 0.250 mol/L = 0.010 mol

d) 60.0 ml: moles HNO₃ = 0.060 L * 0.250 mol/L = 0.015 mol

Now we need to calculate the moles of CH₃NH₂ and CH₃NH₃+ remaining after the reaction.

For case a) 0.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.000 mol = 0.010 mol

moles CH₃NH₃+ formed = 0.000 mol

For case b) 20.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.005 mol = 0.005 mol

moles CH₃NH₃+ formed = 0.005 mol

For case c) 40.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.010 mol = 0.000 mol

moles CH₃NH₃+ formed = 0.010 mol

For case d) 60.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.015 mol = -0.005 mol (Excess acid)

moles CH₃NH₃₊ formed = 0.015 mol

Since methylamine is a weak base, we need to consider the Kb value to calculate the concentration of hydroxide ions (OH-) and then convert it to pH.

The Kb expression for methylamine is:

Kb = [CH₃NH₃+][OH-] / [CH₃NH₂]

We can assume that [OH-] ≈ [CH₃NH₃+], so the equation becomes:

Kb = [OH-]^2 / [CH₃NH₂]

Rearranging the equation:

[OH-] = sqrt(Kb * [CH₃NH₂])

Now, let's calculate the OH- concentration and convert it to pH for each case:

a) 0.0 ml:

[OH-] = sqrt(3.7x10^-4 * 0.010 mol) ≈ 0.00608 M

pOH = -log10(0.00608) ≈ 2.22

pH = 14

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An empty graduated cylinder is weighs 55.5 g. when filled with the 71.5 ml of  unknown liquid, it weighs 135.0 g. The density of the unknown liquid in g/ml is 29.5 g/L.

The given data :

The mass of empty graduated cylinder = 55.5 g

The volume of the unknown liquid = 50 mL

The mass after the liquid is filled = 135 g

The mass of the liquid = total mass - mass of cylinder

                                      = 135 - 55.5

                                       = 79.5 g

The density is given as :

Density = mass / volume

             = 79.5 / 50

             = 29.5 g/ml

Thus, the density is 29.5 g/L.

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Equilibrium constant K for the reaction can be written as,

   K = [C]c  [D]d / [A]a  [B]b

In the absence of oxygen, cells cannot carry out their biochemical responsibilities. Oxygen moves to the cells attached to hemoglobin. Equilibrium constant is the value of its reaction quotient. The equilibrium constant, K, expresses the relationship between products and reactants of a reaction at equilibrium with respect to a specific unit. The equilibrium constant K is the ratio of the mathematical product of the concentrations of the products of a reaction to the mathematical product of the concentrations of the reactants of the reaction. protein hemoglobin which binds oxygen in your lungs and carries it to other tissues of your body. hemoglobin bind oxygen tightly so that a large fraction of the hemoglobin will pick up an oxygen before cycling back through the other tissues. However, in the other tissues, one wants hemoglobin to bind oxygen loosely so that it can be easily relinquished for use in respiration. Each concentration is raised to the power of its coefficient in the balanced chemical equation.

suppose a general reaction written,

              aA + bB--->  cC + dD

For the reaction equilibrium constant can be written as,

             Keq = [C]c  [D]d / [A]a  [B]b

The reaction of equilibrium of hemoglobin is,

    Hb(CO)4 + 4O2  ⇌  Hb(O2)4 + 4CO

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The two types of products obtained are:- C5H10O and C5H8.

The given reaction is represented as The reaction between the given alkene and ozone(O3) which undergoes ozonolysis (which splits the double bond between C3 and C4). The two types of products obtained are C5H10O and C5H8, which are formed due to the rearrangement of C5H10O. Here is the representation of the products obtained after the reaction: To obtain the final products, the next step is to treat them with Zn in CH3CO2H which will lead to the conversion of the given aldehyde to a corresponding carboxylic acid by reduction.

In this reaction, the aldehyde group (-CHO) present in the product obtained in the previous step gets reduced to -CH2OH, and then to -CH2CH3.The final product obtained is CH3CH2CH2CH2COOH(alkanoic acid).

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The shortest distance taken by the object to reach the destination at a minimum time is called acceleration. Thus value acceleration depends upon the displacement and time.

Answer:

Explanation:

Two protons removed from an oxygen nucleus result in group is carbon

If an atom loses or gain a proton and it become a new element and an element is determined by the number of proton it has in its nucleus and oxygen has 8 so when you remove two proton then element with 6 proton is carbon and a proton is a proton is a subatomic particles found in the nucleus of every atom and the particles has a positive charge and equal and opposite to that of the electron

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Answer:

i really don't know

Explanation:

but if you got an answer please let me know ty:)

Heat will flow from the system to its surroundings if the reaction emits energy. When heat is emitted from the system into the environment, a chemical reaction is exothermic.

The basis for various sorts of chemical reaction includes the product created, changes that take place, reactants involved, and more. A chemical reaction is the transformation of one or more chemicals, known as reactants, into one or more new compounds, known as products. Chemical components or compounds make up substances.

When the overall standard enthalpy change (H) is negative, a reaction is said to be exothermic. Typically, exothermic reactions produce heat. Exergonic reaction and the phrase are frequently confused.

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Answer:

La masa molar de la sustancia disuelta es de aproximadamente 138,473 g/mol

Explanation:

Los parámetros dados son;

La masa de benceno en el recipiente = 100 gramos

La masa de benceno que se evapora del benceno puro = 1.273 gramos

La masa del soluto no volátil disuelto en 100 gramos de benceno = 10 gramos

La masa de benceno que se evapora de la mezcla = 1.205 gramos

Según la ley de Raoult, tenemos;

\(P_ {solucion} = P_ {solvente} \times X _ {solvente}\)

Dónde;

\(P_ {solucion}\) = La presión de vapor de la solución.

\(P_ {solvente}\) = La presión de vapor del solvente

\(X_ {solvente}\) = La fracción molar del solvente

Por lo tanto;

\(X_ {solvente} = \dfrac {P_ {solucion}} {P_ {solvente}}\)

Según la ley de los gases ideales, tenemos;

\(P \times V = n \times R \times T = \dfrac{m}{M} \times R \times T\)

Dónde;

P = La presión del gas

V = El volumen ocupado por el gas

m = La masa del gas

M = La masa molar del gas

R = La constante universal de los gases

T = La temperatura del gas

n = El número de moles del gas

Por lo tanto;

\(P = \dfrac{m \times R \times T}{M \times V}\)

Donde R, T, M y V son constantes, tenemos P ∝ m

\(\therefore X_ {solvente} = \dfrac {P_ {solucion}} {P_ {solvente}} = \dfrac {Masa \ evaporada \ de \ solucion} {Masa \ evaporada \ de \ solvente} = \dfrac {1.205 \ g} {1.273 \ g} \approx 0.9466\)

\(X_ {solvente}\) ≈ 0.9466

\(X_ {solvente} = \dfrac {El \ numero \ de \ moles \ del \ solvente} {El \ total \ numero \ de \ moles \ de \ la \ solucion}\)

El número de moles del solvente, C₆H₆ = (Masa de C₆H₆) / (La masa molar de C₆H₆) = 100 g / (78.11 g.mol) ≈ 1.28025 moles

El número de moles del solvente, C₆H₆ ≈ 1.28025 moles

El número total de moles = El número de moles del solvente, C₆H₆ + El número de moles del soluto no volátil, \(n_ {soluto}\)

\(\therefore X_ {solvente} = 0.9466 = \dfrac {1.28025 \ moles} {1.28025 \ moles + n_ {soluto}}\)

0.9466 × (1.28025 moles + \(n_ {soluto}\)) = 1.28025 moles

1.21189 moles + 0.9466 × \(n_ {soluto}\) = 1.28025 moles

\(n_ {soluto}\) = (1.28025 - 1.21189)/0.9466 moles ≈ 0.07221635 moles

\(\therefore \dfrac {Masa \ de \ soluto} {Molar \ masa \ de \ soluto} = \dfrac {10 \ g} {Molar \ masa \ de \ soluto} \approx 0.07221635 \ moles\)

\(\ Masa \ molar \ de \ soluto = \dfrac {10 \ g} {0.07221635 \ moles} \approx 138.473 \ g / moles\)

La masa molar de la sustancia disuelta (el soluto) ≈ 138,473 g/mol