A university class has 12 students enrolled, 2 of whom are graduate students.
What is the probability that a randomly chosen student will be a graduate
student?
Write your answer as a fraction or whole number.
P(graduate student)
=

The required volume of base is 156.25 mL

Titration of a strong acid with a strong base is a quantitative analysis to determine the molarity of an acid or base solution. Phosphoric acid has the chemical formula H₃3PO₄ with an acid valence of 3, while Barium hydroxide has the chemical formula Ba(OH)₂ with a base valence of 2. The volume of base needed can be calculated using the following formula:

(M H₃PO₄) (V H₃PO₄) (valence) = (M Ba(OH)₂ (V Ba(OH)₂) (valence)

We have,

M H₃3PO₄  = 2.50 m

V  H₃3PO₄  = 50 ml

Valence = 3

M Ba(OH)₂ = 1.2 m

V Ba(OH)₂ = ?

Valence = 2

So,

(M H₃PO₄) (V H₃PO₄) (valence) = (M Ba(OH)₂ (V Ba(OH)₂) (valence)

(2.50) (50.0) (3) = (1.20) (V Ba(OH)₂) (2)

375 = 2.40 V Ba(OH)₂

V Ba(OH)₂ = 375/2.40

= 156.25 mL

So, The required volume of base is 156.25 mL

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According to the given statement A solution's ammonia concentration will be 0.0106 M.

The amount of solute contained in a specific solution volume is the substance's concentrations. The molarity of solute for 1 L of solution, or molarity, is used to express quantities.

NH₄OH(aq) + HCl (aq)⇒ NH4Cl(aq) + H2O (l)

According to the neutralization law,

n[tex]_1[/tex]M[tex]_1[/tex]V[tex]_1[/tex] = n[tex]_2[/tex]M[tex]_2[/tex]V[tex]_2[/tex]

where,

M[tex]_1[/tex] = molarity of HCl solution = 0.1080 M

V[tex]_1[/tex] = volume of HCl  solution = 24.60 ml

M[tex]_2[/tex] = molarity of NH₄OHsolution = ?

V[tex]_2[/tex] = volume of NH₄OH solution = 250.0 ml

n[tex]_1[/tex] = valency of HCl  = 1

n[tex]_2[/tex] = valency of NH₄OH= 1

1 * 0.1080 M * 24.60 = 1 * M2  * 250.0

M2 = 0.0106

As a result, a solution's ammonia concentration will be 0.0106 M.

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When the molar heat of fusion of water is 6.02 kJ/mol, it takes 15.4 kJ of energy to melt 46.8 g of water. The enthalpy of a substance changes due to heat of fusion , which releases energy.

To convert a substance from a solid to a liquid while maintaining pressure, a certain amount of the substance must be used.

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state heat of fusion that is employed in numerous measurements in chemical, biological, and physical systems while the pressure is constant. Called enthalpy

46g/18g equals mols of water.

mole-1 equals 2.56 mole

1 mole melts at a temperature of 6.02KJ of heat.

Heat needed to melt 2.56 moles is equal to 6.02kJ*2.56 = 15.4kJ.

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Wavelength of the second photon emitted is 97.3nm. By using the formula E = hc/λ.

A photon's frequency and Planck's constant are used to calculate the quantum energy. The relationship between wavelength and frequency is inverse, as seen below.

v = c/ λ

The energy of photon of light: given by the formula,

E = hv

E = hc/λ

Given,

wavelength of photon of light at higher energy level is 93.78 nm.

wavelength of photon of light at intermediate level is 2626 nm = 2626×10⁻⁹m

Etotal = hc/λ

Where,

E is the energy of a photon.

h is the Planck's constant (6.626×10⁻³⁴J⋅s)

c is the speed of light (3.0×10⁸m/s)

λ is the wavelength, wavelength is 93.78 nm.

1nm = 1×10⁻⁹m

Therefore, conversion of 93.78 nm into m is, 93.78nm=93.78×10⁻⁹m

Substitute:

Etotal = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{93.78 .10^{-9} }[/tex]

Etotal = 2.12 × 10⁻¹⁸ J

the energy of 1 photon, E1 = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{2626 .10^{-9} }[/tex]

E1= 7.57×10⁻²⁰

the energy of 2 photon, E2 = Etotal-E1

E2 = 2.044× 10⁻¹⁸J

wavelength of second photon,

λ = hc/E2

λ = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{2.04 .10^{-18} }[/tex]

λ = 9.73 × 10⁻⁸m

conversion of m into nm, 1m = 1×10⁹nm

Therefore, conversion of 9.73×10⁻⁸m into nm is

9.73×10⁻⁸m = 9.73×10⁻⁸×10⁹nm =97.3nm

∴ wavelength of second emitted photon is 97.3nm.

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The percent change in volume is 21 %.

given that :

Temperature T1 = 245 K

temperature T2= 282 K

Pressure P1 = P

pressure P2 = P - 0.05 = 0.95 P

V1 = V

V2 = ?

using the ideal gas equation , we get :

P1 V1 / T1 = P2 T2 / V2

V2 = ( P1 V1 T2 ) ( P2 T1 )

V2 = ( P × V × 282 ) /( 0.95P × 245)

V2 = 1.21 V

change in volume =  V2 - V1 = 1.21 V - V

                                               = 0.21

% change in volume = 0.21 × 100 %

                                 = 21 %

Thus, The percent change in volume is 21 %.

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According to the given statement The transition from  n=1 to n=3 results in the largest energy change.

Energy change Equals energy in Minus energy out. To calculate the energy transfer for a reaction, add the bond energy for all the atoms in the reactants (this is the "energy in") and the bond values for all the bonds with in products (this is the "energy out").

Energy is capable of changing its forms. For instance, electrical energy transforms into thermal and light heat when a lightbulb is turned on. A automobile transforms the gasoline's molecular bonds' stored energy into a variety of other forms. Chemical energy is converted to light in the engine through a chemical reaction.

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Answer:

yes

Explanation:

because of the close sharing of pairs of electrons

Because of the close sharing of pairs of electrons (one electron from each of two atoms), covalent bonds are stronger than ionic bonds.

Ionic bonds are formed by the complete transfer of electrons and covalent bonds are formed by sharing of electrons. The force between ionic bonds is electrostatic force, while that in covalent bonds is Van der Waals force. Generally, ionic bonds are much stronger than covalent bonds. In ionic bonds, there is a complete transfer of electrons between elements to form a stable compound. While in a covalent bond, there is only sharing of electrons between two elements to form a stable compound. The force that keeps the ions together is the electrostatic force and the force that keeps the elements together bonded with covalent bonds is the Van Der Waals force. As there is a complete transfer of electrons in ionic bonds, cations and anions are formed. Thus there exists a huge electrostatic force of attraction between these ions.

The molar mass of the diprotic acid is 212 grams/mol.

Perimeter

Calculate the mole of a diprotic acid

Calculate the molar mass

[tex]n_2 = \frac{m_2}{M_2}[/tex]

[tex]M_2 = \frac{m_2}{n_2}[/tex]

[tex]M_2 = \frac{0.2046}{0.0009646}[/tex]

M₂ = 212 g/mol

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The elements carbon, nitrogen, hydrogen, sulfur, phosphorus, and oxygen as well as water are important in searching for life as these elements are the main components of organic water whereas water is the universal solvent dissolving these organic molecules.

The elements needed for life to exist are the elements found in organic compounds.

The elements that are found in organic compounds are:

These elements are found in the main macromolecules of life which are proteins, lipids, carbohydrates, and nucleic acids.

Another substance that is the most important substance that sustains life is water.

Water is needed for life because it is the most important solvent in which the living components of the cells are dissolved.

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The diode is forward-biased. The acceptor concentration on the p-side is [tex]N_{A}[/tex] = 10¹⁶ cm⁻³. The donor concentration on the n-side is [tex]N_{D}[/tex] = 10¹⁴ cm⁻³.  The intrinsic carrier concentration is [tex]n_{i}[/tex] = 3.16×10¹¹ cm⁻³. Yes, the low-level injection condition applies. The bias (in volts) applied to the diode is [tex]V_{A}[/tex] = 0.18V.

The diode is forward-biased because of the excess electrons on the P-side and the excess holes on the N-side. In the intrinsic carrier concentration on the P-side n₀p₀ = 10¹⁶ × 10⁷ = 10²³ = [tex]n_{i}[/tex] = √10²³ = 3.16×10¹¹ cm⁻³, while on the N-side n₀p₀ = 10¹⁴×10⁹ = [tex]n_{i}[/tex] = √10²³ = 3.16×10¹¹. The low-level injection applies on the P-side as Δn(-[tex]x_{p}[/tex]) = 10¹⁰ << p₀ and on the N-side Δp([tex]x_{n}[/tex])=10¹² << n₀ = 10¹⁴.

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Methane is the common name for methane. In the organic molecule, it is the simplest hydrocarbon and a hydride of carbon. Tetrahedral in shape and with an exact bond angle of 109.50 in Lewis structure.

The methane molecule has the Lewis structure, Dots are used to indicate the positions of electrons surrounding the atoms in a molecule, while lines or pairs of dots are used to represent covalent connections between atoms in a Lewis structure. The goal of creating a Lewis dot structure is to locate the molecules' lone electron pairs in order to establish how chemical bonds are formed. Natural gas's primary component and the simplest alkane is methane, a chemical molecule with the molecular formula methane (one carbon atom bound to four hydrogen atoms).

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Answer:

ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Explanation:

Answers:

1) If the marble usually rolls right to the end of the box without bouncing off anything, this indicates that the size of the targets is appropriate for the marble.

2) Rutherford's data led him to conclude that atoms are mostly empty space, with a very small, very dense nucleus at the center. This data changed the model of the atom from a solid, indivisible sphere to a mostly empty space with a small, dense nucleus.

3) Bohr's model of the atom was an improvement on Rutherford's model. Bohr made the following changes:

These changes helped to explain the spectral lines of atoms and the stability of atoms.

1) The reaction is as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2)  chlorine is reduced. bromine is oxidizes.

1) In the question is given that : silver acetate combines with potassium chromate to produce potassium acetate and the final product is silver chromate. the reaction is given as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2) When chlorine gas is bubbled through a solution of sodium bromide, a reaction occurs which produces salt (sodium chloride) and bromine gas.

Cl₂   +   2NaBr   ----->   2NaCl    + Br₂

The chlorine oxidation state changes to 0 to -1 . so chlorine is reduced.

The oxidation state of brome is changes from -1 to  . so bromine is oxidizes.

Thus, 1) The reaction is as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2)  chlorine is reduced. bromine is oxidizes.

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Answer:

Sulphate ion

Explanation:

Zinc will undergoes oxidation. Zn2+ - - > Zn + 2e-

Copper will undergoes reduction. Cu2+ + 2e- - - > Cu

It is appropriate for just an endothermic reaction when the reactant's bonds are stronger than the product's bonds.

The correct answer is B

Chemical reactions classified as endothermic occur when the reactants absorb heat energy from their surroundings to produce products. These occurrences have a cooling effect because they make their immediate surroundings colder.

If heat is absorbed by system from of the environment, the reaction and physical change is endothermic. As a result of the system absorbing heat from its surroundings during an endothermic process, the environment's temperature drops.

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The solid Aluminium Nitrate is added to distilled water to produce the solution, the concentration of Aluminium ions in the solution is 0.20 M

The Solid Aluminium Nitrate Al[NO₃]₃ consists of a ratio of 1 Aluminium ion consisting of 3 Nitrate ions per formula unit.

Thus, the concentration of [NO₃]³⁻ is given as 0.60M

1 [Al]³⁺  →  3[NO₃]

∴ 1 [Al]³⁺ → 1/3 × 0.60

1 [Al]³⁺ → 0.20 M

Hence, the concentration of aluminum ions in the solution is 0.20 M.

The Aluminium Nitrate appears to be a white, crystalline solid. Though it is a non-combustible compound but can accelerate the burning of combustible materials. In large quantities, it could lead to explosions.

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The reported amount of antacid in the sample will be too high.

What are antacids?

Antacids are simply assembled salts and salk like compound which help in neutralizing of acids.This Neutralization reaction by antacids leads to various products such as other salts, water and possibly carbondioxid which results in hydrolysis and insoluble compound precipitation. There is a noticeable decline in the neutralizing ability by antacids and neutralization rate of aluminum-containing antacids when they are neutralized ny antacids in the presence of organic acids, peptones, and polypeptides.

In above case, the reported amount of antacid will be high because it will report as more NaOH needed to neutralize a greater amount of HCl.

Hence, The reported amount of antacid will be too high.

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The sample's antacid content will be overstated in the reported amount.

What are antacids?
Simple salts and salk-like compounds that are assembled to form antacids aid in neutralising acids. Antacids' neutralisation reaction produces a number of byproducts, including other salts, water, and possibly carbon dioxide, which causes hydrolysis and the precipitation of insoluble compounds. When aluminum-containing antacids are neutralised by antacids inside the presence of organic acids, peptones, and polypeptides, there is a discernible decline in their ability to neutralise and rate of neutralisation.

In the aforementioned situation, the reported amount of antacid would be high because more NaOH will be required to neutralise a larger amount of HCl.

Hence, The reported amount of antacid will be too high.
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2-Methyl-butan-2-ol is the major product of the reaction of ethyl grignard and propiophenone (ethyl phenyl ketone).

The nucleophile in a keto or aldehyde is coupled to alkyl, ethyl ester, vinyl, or allylic halides in the Fermentation process, an organo combination of carbon monoxide. It takes place in this process for carbon-carbon bonds to form.

It is possible to count the halogen atoms in a halide compound using Grignard reagents. For the chemical examination of several glycerides as well as numerous cross-coupling processes for the synthesis of various dioxide and carbon-heteroatom linkages, Grignard degradation is employed.

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When calculating the straight average or arithmetic average, all numbers are treated equally and are weighted equally. Weighted averaging, however, assigns a weight that predetermines the relative importance of each data point. Weighted averages are most often calculated to even out the frequency of values ​​in a data set.

What are straight average and weighted average ?

The straight average is calculated by adding the earned totals and dividing by the possible totals using points or percentages for the current grading period assignment. The weighted average assigns an importance (or weight) to each number. Weighted averages are more useful than regular averages because they provide more nuance. Less important data are given less weight, so more important data have more impact on results

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The molarity of a resulting solution is 0.707 mol/L

The molarity of a solution is defined by the amount of solute in moles divided by the volumes of solution in litres.

1 grams of ammonia is equals to 0.05872 mol

100 grams  of ammonia is equals to 5.872 mol

Molarity of a resulting solution would be = 100 gm of NH3 / 8.3 L of a solution.

That is 5.872 moles of NH3 / 8.3 of a solution.

Molarity of a resulting solution would be 0.707 mol/L of a solution.

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Answer:

grams Sucrose = 0.0029214440066693 mole using the molecular weight calculator and the molar mass of C12H22O11.

Answer: 5.41 moles

N=m/M

  = 1850/12*12+22*1+16*11

N= 5.41 moles

If there are 0.2 M solutions of both acid and base, the concentrations of hydrogen and hydroxide ions will be equal at equivalence point.

The reaction of sulfuric acid and a basic solution BOH occurs as follows;

H2SO4(aq) + 2BOH(aq) -----> B2SO4(aq) + 2H2O(l)

In the question, we are told that that both the solution of the sulfuric acid and the basic solution are 0.2 M.

The point where all the hydrogen and hydroxide ions have reacted according to the stoichiometry of the reaction. If there is really equimolar amounts of acid and base, the concentration of hydrogen and hydroxide ions will be equal at equivalence point.

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Trial 4's half-life of the reaction is shorter than Trial 1's half-life. Because the activation energy and half life are both precisely related. In comparison to trail 4, trail 1 activation energy is higher.

A reaction's t1/2, or half-life, It occurs when the concentration of a reactant is halved from its starting concentration. T1/2 is used to represent it.

Activation energy is the required amount of energy to start the reaction. Kilojoules per mole (kJ/mol) is the unit used to measure the activation energy (Ea) of a reaction. Activation energy is the force that causes an object to begin acting in a certain way or to start a specific process.

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A gas at 65.0°C occupies 4.22 L. If the pressure remains the same, at which Celsius temperature will the volume be 3.87 L out to be 310 degrees

You can leave the pressure out of both sides of the equation since the pressure is constant to make it easy.

so all you have is volume over Temp = new volume over new temp which is we don't know.

4.22 liters over 338 Kelvin = 3.87 liters over T

cross multiply and solve for T which comes out to be 310 degrees K or 37 degrees C

Yes you are right it is 310

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While determining the volume during this experiment .if the total volume of the flask were incorrectly reported as 125 ml,  this error affect the calculated molar mass of the unknown volatile liquid. yes

The number of mole calculated by the following formula :

number of moles = mass / molar mass

greater the number of number of moles low the molar mass.

the ideal gas equation is given as :

P V = n RT
and the volume is directly proportional to moles . if the volume increases molar mass decreases.

Thus, While determining the volume during this experiment .if the total volume of the flask were incorrectly reported as 125 ml,  this error affect the calculated molar mass of the unknown volatile liquid. yes

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Other natural therapies, such as salt water, can help soothe a sore throat. Gargling with salt water works well to destroy bacteria, reduce discomfort, and loosen mucus.

When you fix something that is broken or harmful, you enhance it. To correct the situation, a lot has been done inside. Synonyms include rectify, redress, and reform. More remedies' opposites.

The four primary categories of judicial remedies are (1) damages, (2) restitution, (3) coercive remedies, and (4) declaratory remedies. These categories are organized according to their intended use. Damages are typically used as a remedy to make up for any harm that has been done to the affected party.

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The frequency of a wave whose wavelength is 5.67 × 10-⁷m is 5.3 × 10¹⁴Hz.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

The wavelength of a wave is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency as follows:

λ = v/f

Where;

The frequency is the quotient of the number of times, n, a periodic phenomenon occurs over the time (t) in which it occurs.

According to this question, a wave has a wavelength is 5.67 × 10-⁷m. The frequency can be calculated as follows:

5.67 × 10-⁷ = 3 × 10⁸/f

f = 3 × 10⁸ ÷ 5.67 × 10-⁷

f = 5.3 × 10¹⁴Hz.

Therefore, 5.3 × 10¹⁴Hz is the frequency of the wave

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