2. you have 0.05 ml of an undiluted culture at a concentration of 3.6 x 106 cfu/ml. you then add 4.95 ml of sterile water. what is the dilution, and what is the final concentration of cells?

It will take, 2.6×10²/ (50 days) for a sample of radon-218 to decay from 99 grams to 0. 50 grams.

What is Nuclear decay?

When an atom's nucleus is unstable and produces radiation on its own, this process is known as nuclear decay. In turn, one or more new elements' nuclei are formed from the original element's nucleus. These progeny nuclei are less energetically unstable and have a smaller mass than their parent nuclei.

For instance, uranium-238 emits an alpha particle as it decays into thorium-234.

Therefore, It will take, 2.6×10²/ (50 days) for a sample of radon-218 to decay from 99 grams to 0. 50 grams.

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The percent ionization of a monoprotic weak acid solution that is 0.181 m the acid-dissociation (or ionization) constant, ka, of this acid is 2.32×10−11  is 1.13x10^-3 T%

The concentration of solution of 0.433 M.

The Ka of the acid is 2.32 x 10~

~and the solution has a concentration of 0.181T M.

We can calculate the hydronium ion concentration by using the equation: |

Ka=[H3O+][A-]/HA-][H3O+]

[H3O+]=[A-]

[H3O+]^2=Ka[HA]

[H3O+]^2= 2.32X10^-11x0.181M[H3O+]=2.049195x10^-6 M

We can then calculate the percent ionization using the equation:

Percent ionisation= [H3O+]/[HA]x100

Percent ionisation= 2.049195x10^-6 M/0.181 M=1.13x10^-3 %

The percent ionization is 1.13x10^-3 %

The percent ionization of a 0.433 M solution of the monoprotic acid is 0.00113%

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The percent ionization of a monoprotic weak acid solution that is 0.181M is  0.001132%

It is given that the concentration of the monoprotic acid is 0.181M and the acid-dissociation (or ionization) constant, ka, of this acid is 2.32×10^−11.To find the percent ionization of a monoprotic weak acid solution, the following steps are to be followed,

[H+] = √Ka x C

On substituting the values of Ka and the concentration of the acid, we get

[H+] = √2.32 x10⁻¹¹ x 0.181

       = √0.4199x10⁻¹¹

[H+] = 2.049 x 10⁻⁶M

The dissociation is given by,

AH + H₂O -------> A- + H₃O⁺

[H+] = [A-] = 2.049 x 10⁻⁶M

[HA] at equilibrium is given by

= 0.181-2.049 x 10⁻⁶

=0.180997

The percentage of ionization is given by,

Percentage ionization = [H₃O⁺]/[HA] x 100

On substituting,

Percentage ionization = 2.049 x 10⁻⁶/0.181x100

                                     = 1.132 x 10⁻³%

Percentage ionization = 0.001132%

Therefore the percentage ionization is 0.001132%

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If one atmosphere of pressure is equal to 760 torr, a pressure of 705 torr is equal to value in atmospheres is  0.96 atm

1 atm = 760 torr

So, 734 torr = (1 atm) (734 torr) /(760 torr)

= 0.96 atm

According to the kinetic theory of gases, gas particles are always in motion and clashing with one another and the container walls they are held in. Although collisions with container walls are elastic (i.e., there is no net energy gain or loss due to the collision), a gas particle does exert a force on the wall during the contact. Pressure is created by the buildup of all these forces, which are dispersed throughout the container's walls. By dividing the total force of all gas particle/wall collisions by the area of the wall, one can calculate pressure (P):

One of the basic measurably present quantities of this phase of matter, pressure, is an effect that all gases have.

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14.61 g of sodium chloride is dissolved in water to make 500 ml of solution. (show work) a. what is the mass/volume %? b. what is the molarity of this solution?   0.499 (approx)

Mass of sodium chloride, m​​​​​solute=14.61 g    (given)

Volume of solution,v ​​​​​solution=500 ml=0.5 litres (given)

a. Mass/volume % is ratio of mass of solute in grams and volume of solution in ml multiplied from 100%

Mass/volume%=(m​​​​​solute/v​​​​​solution)*100%

           =(14.61/500)*100%

Mass/volume%=2.928%

b. Mass of sodium is 23 and chlorine is 35.5

Molecular mass of sodium chloride ie NaCl=23*1+35.5*1=58.5

Number of moles of NaCl is found by dividing mass of NaCl in grams by molecular mass of NaCl,

Number of moles of NaCl,n​​​​​solute=14.61/58.5

Molarity of the solution is found by dividing number of moles of solute ie sodium chloride (NaCl) from volume of solution in litres,

Thus,

Molarity of solution=n​​​​​​solute/v​​​​​​solution

        =(14.61/58.5) / 0.5

       =0.499 (approx)

Sodium chloride is used as an electrolyte replenisher to assist save you warmth cramps as a result of an excessive amount of sweating. This medicinal drug is likewise used for the coaching of normal isotonic answer of sodium chloride. This medicinal drug is to be had without prescription.

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No, the enthalpy of neutralization for weak acid-strong base reactions will not be the same as for strong acid-strong base reactions.

This is because weak acids do not react as readily and completely with strong bases as strong acids do, resulting in a lower enthalpy of neutralization. Additionally, the extent of the reaction between a weak acid and a strong base will depend on the relative strengths of the two reactants, as well as the concentrations of the reactants.

Therefore, the enthalpy of neutralization for a weak acid-strong base reaction can vary depending on the specific reaction and the concentrations of the reactants.

Any neutralization reaction between a strong acid and strong alkali actually comes down to the same thing i.e.

H⁺ + OH⁻-------> H₂O,

as all the other ions present are spectator ions and so don't play an active part in the reaction. As the overall reaction is always the same irrespective of the acid or alkali the enthalpy change will also be the same.

If a weak acid is used the enthalpy change will be less exothermic as some of the energy evolved will be canceled out by the energy needed to complete the dissociation of the incompletely dissociated acid during the reaction

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The moles of the solution are 0.256 mol. the mole fraction of gold 0.097 and the mole fraction of silver is 0.902.

given that :

mass of gold = 5 g

mass of silver = 25 g

molar mass of gold = 196.9 g/mol

molar mass of silver = 107.8 g/mol

a) moles of gold = mass / molar mass

                        = 5 / 196.9

                        = 0.025 mol

moles of silver = mass / molar mass

                        = 25 / 107.8

                        = 0.231 mol

total moles of solution = 0.025 + 0.231 = 0.256 mol.

b) mole fraction of silver = 0.231 / 0.256

                                        = 0.902

mole fraction of gold = 0.025 / 0.256

                                   = 0.097

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Resonance is a way of describing delocalized electrons within certain molecules. Here, the bonding cannot be expressed by a single Lewis formula.

When a nuclei are in an EM radiation with a proper frequency, the nuclei aligned with the field will absorb energy and spin flip. When the spin flip happens, the nuclei are said to in resonance with the field. Thus, this technique is NMR ( Nuclear magnetic resonance).

How to calculate peaks due to spin spin coupling?

In general NMR resonance will split into (n+1) peaks where n is the number of hydrogens on the adjacent atom due to spin spin coupling.

So, for group A, n=3

Therefore, number of peaks in group A's NMR signal =3+1=4

Therefore, 4 peaks is the main answer

A quartret will be formed in 1:3:3:1 ratio.

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Answer:

Fertilization

How might you get ready? 5.00 ml of a copper 2 sulfate solution at 0.06 m from mass= 2.926g

It fills several biological functions throughout the body and is found in numerous forms. It aids drug, food additive, and toxic metal detoxification and is a crucial part of extracellular matrix proteins. Additionally, it stops blood from clotting when it passes through capillaries.

Briefing

molarity = no.of moles of copper /Volume of Solution in lit

0.235=no of moles sulfate /494.9*10^-3

13.114 *10^-3 moles of copper sulfate

molar mass of copper sulfate  =223.15 g/mol

moles= given mass/molar mass=13.11485*10^-3.

13.1148810^-3= mass/223.154

mass= 2.926g

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This transport molecule is a flavoprotein. Because this carrier molecule in the chain can bypass the following carrier and transmit electrons to oxygen directly, hydrogen peroxide is produced.

Which is a pair of extremely strong cellular poisons. Proteins known as flavoproteins include a nucleic acid derivative of riboflavin. The elimination of radicals that cause oxidative stress, photosynthesis, and DNA repair are just a few of the biological processes that flavoproteins are engaged in. A group of two or more atoms bound together by the attractive forces known as chemical bonds is referred to as a molecule; depending on the context, the term may or may not include ions that meet this requirement.

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Phenoby is supposed to tell others that, "Telling and giving understanding are two different things".

According to Phenoby mink is so valuable, but coon is not valuable, even though both are fur.

Janie implies that within a short period of time telling would be taken by people simply as passing sentence and would most likely will be forgotten.

On the other hand people's behavior can be changed to the better way of thinking by making people understand about the real fact.

Hence, Phenoby is supposed to say this to others.

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2N2 + 5 O2 → 2 N2O5 Because there is more N2 than what would be required to complete the reaction (1.83 x (2/5) = 0.732 liter of N2), O2 is the limiting reactant and N2 is in excess. (2 mol N2O5 / 5 mol O2) x (1.83 L O2) = 0.732 L N2O5

Gay Lussac Law Calculation

The results of fresh experiments by French chemist Joseph Louis Gay-Lussac were published in 1808 along with a generalization that has since become known as Gay-law Lussac's of mixing gases. If the gas volume remains constant, the Kelvin temperature is directly proportional to the gas volume. V 1 T 1 = V 2 T 2.

The tire pressure of a car increases after driving. This is due to the air inside the tires heating up as a result of friction (a contact force) between the tires and the road. Gay-Law Lussac states that because the air cannot expand because the tires are effectively fixed-volume containers, the pressure rises.

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It lowers the concentration of phosphate ions, shifting the balance to the left.

The maximum number of a chemical that will disintegrate in such a solvent at a given temperature is referred to as its solubility. Varying compounds have very high solubility, which is a characteristic of a particular solute-solvent pair.

The quantity of solute in one liters of a saturated solution, or solubility, is measured in grams. For instance, their solubility in water at 25 oC might be displayed as 12 g/L. The amount of solute per milliliter of saturated solution is measured by its molar solubility. As an illustration, positive and significant at 1 mol/L at 25 oC.

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The molarity of the acid is 0.1M.

M=n/c

=2/20

=0.1M

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1. Graphite, liquid and diamond- The upper point where the lines connect is known as the upper triple point.

2. The "gas" phase of the diagram includes the intersection point, which is located at 100 atm and 6000 K. Therefore, at 100 atm and 6000K, the gas phase is stable.

3. The production of liquid carbon would include starting from the lower triple point by raising the temperature and pressure.

What is phase diagram?

A phase diagram depicts how a substance reacts to changes in temperature and pressure in a confined container. A potential system temperature and pressure combination is represented by each point in this graphic. The substance's solid, liquid, and gaseous states are represented by the three sections that make up the diagram.

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The type of non-covalent interaction between the base pairing of a double helix of DNA molecule is hydrogen bonding.

The nucleic acids are categorized into two types that are as follows:

Deoxyribonucleic acid (DNA)

Ribonucleic acid (RNA)

The pairing of bases occurs in both RNA and DNA molecules. The bases that are present in DNA molecules are guanine, adenine, cytosine, and thymine while the bases that are present in RNA molecules are adenine, uracil, guanine, and cytosine.

In a DNA molecule, the pairing is done in a way that A is always paired with T, while G is paired with C and in RNA the base T is replaced by U. There exist hydrogen bonding between base pair and double helix of DNA molecule, they are weak bond and can be broken down easily.

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Concentration of the original ba(oh)₂ solution is 0.33 M.

What is Concentration?
Concentration in chemistry is defined as the quantity present in a mixture in excess of its total volume. It is possible to distinguish between the four different types of mathematical descriptions: mass concentration, molarity, number concentration, as well as volume concentration. The term "concentration" can be used to describe any type of chemical mixture, but it most often refers to the amount of solutes and solvents in a solution. Osmotic concentration and normal concentration are two variations of the molar (amount) concentration. The term "concentration" or an adjective like "dilute" for solutions with a low concentration as well as "concentrated" for solutions with a high concentration are frequently used in everyday, non-technical language to describe concentration in a qualitative manner.

Explanation:
Here, we have given two solution with their conc. and volume
So, formula used to calculate conc. is
M1V1 = M2V2  
let
M1 = molarity of ba(oh)2
V1 = volume of ba(oh)2 used
M2 = molarity of HNO 3
V2 = volume of HNO3 used
Now,
M1 X 35 = 0.35 x 33
M1 = 0.35 X 33 / 35
M1 = O.33

Hence, the concentration of ba(oh)2 is 0.33 M.

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Solution B (pH 2)  has more H+ ions

Solution B (pH2) has less OH- ions

Solution A (pH4) is more basic

Solution B (pH2) is more acidic

pH is a measure of hydrogen ion concentration, which indicates whether a solution is acidic or alkaline. The pH scale is typically 0 to 14. Aqueous solutions with a pH less than 7 at 25°C are acidic, whereas solutions with a pH greater than 7 are basic or alkaline.

In aqueous solution, acids and bases release H+ ions and OH- ions, respectively, according to Arrhenius theory. Their relative strengths, however, are expressed in terms of pH value, which is the negative logarithm of H+ ion concentration. In fact, there is a pH scale that ranges from zero to fourteen. A solution with a pH less than 7 is considered acidic, while one with a pH greater than 7 is considered basic. It should be noted that the pH of a solution decreases as it becomes more acidic. A solution is more alkaline the greater its pH value.

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The planet's PH decreased, thereby making the water there increasingly acidic.

There are numerous distinct chemicals in seawater. Because when freshwater in water evaporates and salt is left behind, several of these chemicals can be seen. Pure substance made up water and oxygen is called water, or H2O.

Rainwater and dissolved chemical substances combine to become seawater. A great solvent is water. Juices that dissolve other compounds are known as solvents. Numerous solutes are present in the majority of the earth's water, which includes the moisture in oceans, pools, rivers, and ponds.

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The percent yield of this reaction is 53.05 %.

From the question, we have

Moles of carbon = 5.25/12.011 = 0.437

Mass of carbon dioxide formed = mole*molar mass

= 0.437 mol*44g/mol = 19.228 g.

Percent yield = 10.2/19.228*100%

=53.05%

The percent yield of this reaction is 53.05 %.

mass in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force.

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The pressure of the gas inside the container is 1.6 atm. .This is calculated by the ideal  gas law.

Ideal gas law states that the pressure of ideal gas is directly proportional to the absolute temperature of the gas. The ideal gas law also called the general gas equation. This is the equation of state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions . The expression for ideal gas law is,

          PV = nRT

where,  P is the pressure of the gas

             V is the volume of the gas

             n is the number of moles of the gas

             T is the temperature of the gas

A container with 3.00 moles of gas has a volume of 60.0L with a temperature at 400 K. To find the pressure of the gas we have to apply all these value in ideal gas law.

n = 3.0 moles

V = 60.0 L

T = 400 K

From PV = nRT,

           P = n RT / V

         = (3.0 mole) (0.0821 L-atm. /K-mole)(400 K) / 60.0L

         = 1.642 atm.

          = 1.6 atm.

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The amount of hcl is 0.0432 M. A neutralizing reaction happens after the acid and base are allowed to mix.

What happens during neutralization?

When an acid and a base come together, neutralization takes place, raising the pH to roughly 7. When lime is added to acidic soil to cure and relieve indigestion, for example, it is a practical practice that is used every day. Additionally, neutralization causes an alkali's pH to decrease to around seven.

Which specific neutralization can you cite?

Ans: A neutralizing reaction has numerous uses in daily life. For instance, antacid tablets, which have a fundamental ingredient, help balance gastric acidity. The neutralizing reaction helps to prevent tooth decay in a manner similar to that

Briefing:

volume of NaOH = 54 mL / 1000 = 0.054 L

Molarity NaOH = 0.1 M

Number of moles NaOH :

n = M * v

n = 0.1 * 0.054

n = 0.0054 moles of NaOH

Finally we calculate the number of moles of HCl in the solution from the stoichiometry of the reaction :

HCl + NaOH = NaCl + H₂O

1 mole HCl -------- 1 mole NaOH

?moles HCl ------- 0.0054 moles  NaOH

moles HCl = 0.0054 * 1 /1

= 0.0054 moles of HCl

Volume of HCl = 125 mL / 1000 = 0.125 L

M ( HCl ) = n / V

M = 0.0054 / 0.125

= 0.0432 M

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The Born-Oppenheimer Approximation is the assumption that the electronic motion and the nuclear motion in molecules can be separated. It leads to a molecular wave function in terms of electron positions and nuclear positions.

This mainly involves the following assumptions:

The electronic wavefunction depends upon the nuclear positions but not upon their velocities, i.e., the nuclear motion is so much slower than electron motion that they can be considered to be fixed.

The nuclear motion sees a smeared-out potential from the speedy electrons.

If a Hamiltonian is separable into two or more terms, then the total eigenfunctions are products of the individual eigenfunctions of the separated Hamiltonian terms.

Associated with each measurable parameter in a physical system is a quantum mechanical operator and the operator associated with the system energy is called the Hamiltonian. The Hamiltonian contains the operations associated with the kinetic and potential energies.

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The number of atoms in a 27.5-gram zinc ring compared to the number in a nickel ring of the same mass contains 1.08 times more atoms than 27.5g of zinc.

You need to convert the masses of zinc and nickel to no. of moles by using

Moles = mass/Relative Atomic Mass

Then you can calculate the number of atoms knowing that 1 mole of any substance contains the Avogadro Constant number of particles (atoms or molecules usually).

So , no. if moles of zinc = 27.5g/65.3

= 0.42 moles.

Since 1 mole contains 6.023 x 10²³ atoms, then 0.15 mole contains (6.023 * 10²³) x 0.42 atoms

= 2.5 10²³ atoms.

Similarly for nickel, no. of moles = 27.5/ 58.6

= 0.46 moles.

This contains (6.023 x 10²³) x 0.46 atoms.

= 2.7 x 10²³ atoms.

So 27.5g of nickel contains 2.7 x 10²³/ 2.5x 10²³ more atoms than 27.5g of zinc.

Thus, 27.5 g nickel contains 1.08 x more atoms than 27.5g of zinc.

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The final temperature at which both become equal is 81.95°C.

What is Specific Heat?

The amount of heat needed to raise a substance's temperature by one degree Celsius in one gramme, also known as specific heat. Typically, calories or joules per gramme per degree Celsius are used as the units of specific heat. For instance, water has a specific heat of 1 calorie (or 4.186 joules) per gramme per degree Celsius.

The French scientists Pierre-Louis Dulong and Alexis-Thérèse Petit showed in the early 19th century that measurements of a substance's specific heat allow one to calculate their atomic weights.

   45x0.88x(X-24)=-180×4.184×(X-85)

   39.6X-950.4=-753.12X+64015.2

   792.72X=6495.6

     X=6495.6/792.72

     X=81.95°C

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The concentration of acid when the vat is one-fourth full is 3%.

What is an acid?

The concentration of acid when the vat is one-fourth full can be expressed as a proportion of acid to the total volume of solution in the vat.

At the start, the vat contains 30 liters of a 5% acid solution. This means that 0.05 * 30 = 1.5 liters of acid is present.

As the solution is pumped out at 4 liters per second, and pure acid is pumped in at 3 liters per second, the total amount of acid in the vat is increasing at a rate of 3 liters per second.

At one-fourth full, the vat will contain 10 liters of solution (one-fourth of the original 40 liter volume).

To calculate the concentration of acid at this point, we need to calculate the total amount of acid present. Since the rate of increase of acid is 3 liters per second, after 10 seconds, the amount of acid present will be 3 * 10 = 30 liters.

Therefore, the concentration of acid when the vat is one-fourth full is 30/10 = 3%.

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Answer:large central vacuole

Explanation:

Aldohexose is the carbohydrate with the carbonyl group on the end of a six-carbon chain.

What are carbohydrates?

All carbohydrates are polyhydroxy aldehydes or ketones, or chemicals that can be broken down to generate such compounds, and they all include carbon, hydrogen, and oxygen atoms. Starch, fiber, the sweet-tasting substances known as sugars, and structural components like cellulose are examples of carbohydrates.

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Gas giants: atmosphere of mainly hydrogen and  helium, mantle of metallic hydrogen

KE giants: atmosphere of mainly hydrogen helium, and methane ,  mantle of water. ammonia, and methane ice, have a core made of rock or solid

both:  have rings

Since helium cannot be produced chemically, our supplies come from the extremely slow radioactive alpha decay that takes place in rocks. Helium can be extracted from rocks and natural gas deposits, but it is around 10,000 times more expensive to do so from the air. It may be found in water, soil, and air and provides plants and animals with the essential nitrogen they require. The natural decomposition of manure and dead plants and animals produces the majority of the ammonia that enters the environment. Fertilizer uses account for 80% of total ammonia production.

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Geometrical isomerism:- When two coordination compounds differ in the arrangement of their ligands in space around the central metal ion, they are said to be geometrical isomers.

What are geometrical isomers?

A geometric isomer is a type of stereoisomerism. It is also known as cis-trans isomerism. Geometric isomerism occurs due to the banned rotation about carbon-carbon double bonds or carbon-carbon single bonds in cyclic compounds.

Geometrical isomerism:- When two coordination compounds differ in the arrangement of their ligands in space around the central metal ion, they are said to be geometrical isomers.

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