For a phase change, AH = 31 kJ/mol and Sº= 0.093 kJ/(K-mol). What are
AG and the spontaneity of the phase change at 300 K?
OA. AG 3.1 kJ; nonspontaneous
OB. AG=59 KJ; spontaneous
OC. AG= 3.1 kJ; spontaneous
O D. AG= 59 KJ; nonspontaneous

Trans isomer of  1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide

Structural isomers are those isomers in which the atoms are completely arranged in a different order but they have the  same molecular formulas. These are the molecules having the same kind of molecular formula with different connectivity which is completely  depending upon the order they are put together.

Cis isomers are molecules with the same connectivity of atoms. They feature that the same side priority groups are placed on the same side of a double bond. Trans isomers feature molecules with same side priority groups placed on opposite sides of a double bond.

In the above given question the trans isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide, because in trans isomer there is less steric hindrance and therefore it can react easily, where as the cis isomer is having a lot of  steric hindrance

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Dipole-dipole forces are not the greatest force  \(CO_{2}\) from the examples given. While the largest forces in the other compounds, such as \(CH_{2}Br_{2}\), \(CH_{3}Br\), \(CHCl_{3}\), and \(CH_{3}OCH_{3}\), are dipole-dipole forces.

Despite having polar connections between its center carbon atom and two oxygen atoms, \(CO_{2}\) is a non-polar molecule. There are only London dispersion forces since the dipoles are pointing in opposite directions and cancel each other out.

There is an electronegative difference between the carbon atom and the halogen atom in the compound \(CH_{2}Br_{2}\), \(CH_{3}Br\), and \(CHCl_{3}\) . As a result, these compounds, which are also polar, include dipole-dipole forces. The dipole-dipole and London dispersion forces are both present in the compound \(CH_{2}Br_{2}\).

Dimethyl ether is \(CH_{3}OCH_{3}\). In methoxy methane (or dimethyl ether), the carbon and oxygen linkages are polar. Its geometry is angular. This molecule exhibits the London dispersion and dipole-dipole forces.

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The murder took place approximately 851.2 years ago.

Based on the isotope's half-life, we must determine the age of the remains.

90% of the normal amount being present in the remains means that 0.90 of the isotope is still present.

The equation for radioactive decay can be used:

fraction remaining =\((1/2)^(^n^/^t^)\)

Where

We can rearrange the formula to solve for the number of half-lives (n):

n = (log base 0.5) (fraction remaining)

Using the given fraction remaining of 0.90:

n = (log base 0.5) (0.90)

n ≈ 0.152

Since the number of half-lives is a fraction, we can convert it to years by multiplying it by the half-life:

time elapsed = n * t

time elapsed ≈ 0.152 * 5600 years

time elapsed ≈ 851.2 years

So, the murder took place approximately 851.2 years ago.

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Answer:

C. 1 cubic foot of loose sand

Explanation:

For many  objects having equal volume , surface area will be maximum

of the object which has spherical shape .

But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .

Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .

Answer:

the answer would be C 1 cubic foot of loose sand.

The pH of a soapy solution decreases as a result of the introduction of hardness ions.

Soapy solutions are typically basic, with a pH above 7. However, when hardness ions, such as calcium or magnesium, are introduced to the solution, they can react with the soap molecules to form insoluble salts, which reduces the effectiveness of the soap. As a result, more soap may be needed to achieve the desired cleaning effect. Additionally, the removal of weak bases such as RCO2– (which are present in soap molecules) can result in a decrease in pH, as this leads to a decrease in the concentration of hydroxide ions ([OH-]). This decrease in pH can lead to a more acidic environment, with a greater concentration of hydrogen ions ([H+]) compared to hydroxide ions, which can affect the effectiveness of the soap and may require adjustments to the cleaning process.

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Answer:  The radius of atoms increases as you move down a particular group in the periodic table of elements because an atom grows larger as the number of electronic shells increases.

Explanation:

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/Atomic_and_Molecular_Properties/Atomic_Radii

Answer:

A. Silicon

Explanation:

The ability of an atom to attract electrons is known as electronegativity.

Electronegativity  is the measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond.

Answer:

i hace no idea sorry

Explanation:

i do motor know the awnser

The molar flow rate of oxygen is 21mol/s and for the mole fractions of H2O and O in the gas is 0.21 lb-mole oxygen/s

Given the mole % of oxygen in air = 21%

The mole % of nitrogen in air = 79%

Molar flow rate can be calculated by dividing the volumetric flow rate (in m^3/s) by the molar mass of the material (in g/mol).

Molar Flow Rate = Volumetric Flow Rate / Molar Mass

Molar Flow Rate of Oxygen = (21/100) x Total Molar Flow Rate

(21/100) x (21 + 79) = (21/100) x 100 = 21 mol/s

Mole fraction is the ratio of the amount of a particular substance to the total amount of all substances present.

Mole fraction = (moles of the particular substance / total moles of all substances)

Mole fraction of oxygen = (21/100) lb-mole oxygen/s = 0.21 lb-mole oxygen/s

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The molecular formula of the unknown compound is C2H2O2.

To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.

Given:

Percentage of carbon = 40.0%

Percentage of hydrogen = 6.7%

Percentage of oxygen = 53.3%

Molecular mass = 60.0 g/mol

Step 1: Convert the percentages to grams.

Assuming we have 100 grams of the compound:

Mass of carbon = 40.0 g

Mass of hydrogen = 6.7 g

Mass of oxygen = 53.3 g

Step 2: Convert the masses to moles using the molar masses of the elements.

Molar mass of carbon = 12.01 g/mol

Molar mass of hydrogen = 1.008 g/mol

Molar mass of oxygen = 16.00 g/mol

Number of moles of carbon = Mass of carbon / Molar mass of carbon

= 40.0 g / 12.01 g/mol

= 3.332 mol

Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen

= 6.7 g / 1.008 g/mol

= 6.648 mol

Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen

= 53.3 g / 16.00 g/mol

= 3.331 mol

Step 3: Determine the empirical formula by dividing the moles by the smallest value.

Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.

So, the empirical formula of the compound is CHO.

Step 4: Determine the multiple of the subscripts to obtain the molecular formula.

To find the multiple, we divide the molecular mass by the empirical formula mass.

Molecular mass = 60.0 g/mol

Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol

Multiple = Molecular mass / Empirical formula mass

= 60.0 g/mol / 29.018 g/mol

= 2.07

Rounding to the nearest whole number, we get 2.

Therefore, the molecular formula of the unknown compound is C2H2O2.

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Explosive materials need to be handled carefully and stored appropriately to avoid the possibility of initial combustion.   The following are some of the precautions to take when handling explosive materials: Avoid any type of friction, impact, or shock, whether small or large, when handling explosive materials.

Keep the containers of explosive materials tightly sealed to prevent the infiltration of moisture or contaminants. Store the explosives in a cool, dry, and well-ventilated environment, keeping them away from any heat sources or flammable materials. Keep the explosives away from direct sunlight to prevent the heat from building up and causing an explosion.

In conclusion, explosive materials should be handled and stored with care to prevent initial combustion, which may lead to an explosion. Explosives should be stored in a dry, cool, and well-ventilated area, and containers should be kept tightly sealed to prevent moisture or contaminants from entering. Explosives should also be kept away from any heat sources or flammable materials.

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I'm sorry I'm not sure of my answer so I am not gonna give you the answe

To achieve a pH of 5.35 in an acetic acid solution with a concentration of 0.10 M, the acetate concentration would need to be approximately 0.029 M.

Acetic acid (CH3COOH) is a weak acid that partially dissociates in water to produce acetate ions (CH3COO-) and hydronium ions (H3O+). The dissociation can be represented by the following equilibrium reaction:

CH3COOH + H2O ⇌ CH3COO- + H3O+

To calculate the acetate concentration required for a specific pH, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

In this case, acetic acid is the HA (weak acid) and acetate is the A- (conjugate base). The pKa for acetic acid is approximately 4.75. By rearranging the equation and plugging in the given values, we can solve for the acetate concentration:

[A-]/[HA] = 10^(pH - pKa)

[A-]/0.10 M = 10^(5.35 - 4.75)

[A-]/0.10 M ≈ 3.98

Simplifying, we find:

[A-] ≈ 3.98 * 0.10 M

[A-] ≈ 0.398 M

Therefore, the acetate concentration needed to achieve a pH of 5.35 in the acetic acid solution would be approximately 0.029 M.

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Answer: they all have 7  electrons they have different atom sizes

Explanation: hope it helps

To calculate the volume of a gas, use the ideal gas law equation, PV = nRT.

Where:

P = pressure of the gas (in units of pressure, such as atm)

V = volume of the gas (in units of volume, such as liters)

n = number of moles of the gas

R = ideal gas constant (0.0821 L·atm/(mol·K) or 8.314 J/(mol·K))

T = temperature of the gas (in units of temperature, such as Kelvin)

It is important to note that the expression to calculate the volume of the gas would depend on the specific conditions (pressure and temperature) under which the balloon is being measured.

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Answer:

a. "-ic"

Explanation:

The correct answer is a. "-ic".

For example:

Following the same logic, the name for HBr is Hydrobromic acid; and the name for HI is Hydroiodic acid.

Answer:

color is there right answer for this question please make me a brainliest and follow me please please please please

I think its A. Low pressure indicates rising air, Which allows clouds to from.

Answer:

They're sometimes called 'mackerel skies' because they can sometimes have a grayish color which makes the clouds look a bit like fish scales. Cirrocumulus clouds exhibit features from both cumulus and cirrus clouds but should not be confused with altocumulus clouds.Explanation:

Answer:

D

Explanation:

A P E X

D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.

A metric unit of length, equal to one-hundredth of a metre.

To convert a yard measurement to a centimetre measurement, multiply the length by the conversion ratio. The length in centimeters is equal to the yards multiplied by 91.44.

D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.

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Among the elements listed, krypton has the highest electron affinity, with a value of -48.4 kJ/mol. Krypton is a noble gas located in group 18 of the periodic table, which means that it has a full valence electron shell and is generally inert chemically.

Its high electron affinity can be attributed to its small atomic size and large effective nuclear charge, which leads to a strong attraction between the nucleus and incoming electrons.

As a result, krypton readily accepts an additional electron to form the Kr^- ion, which is isoelectronic with the neighboring element, rubidium.

In contrast, the other elements listed (sulfur, sodium, calcium, and copper) all have positive electron affinities, indicating that they do not readily accept an additional electron.

This is because these elements have already filled or partially filled valence electron shells, making it energetically unfavorable to add another electron and disrupt the existing electron configuration.

Additionally, copper is a transition metal and tends to have lower electron affinities than main-group elements due to its partially filled d orbitals, which can shield the nuclear charge and reduce the attraction between the nucleus and incoming electrons. Kr is the correct answer.

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Answer:

The SMRs can adjust their energy output using coolants and control rods.

Power plants can be built to fit locations with less demand or less space.

Explanation:

I think that it is but I am not sure.

Power plants can be built to fit locations with less demand or less space. The SMRs can adjust their energy output using coolants and control rods. The correct options are B and D.

A wireless communications technology that competes with traditional cellular services. The base station equipment supplier is the transmitter licensee in an SMR system.

Power plants can be built to accommodate locations with low demand or limited space. Coolants and control rods allow SMRs to adjust their energy output.

These advanced reactors, which are expected to range in size from tens to hundreds of megawatts, can be used for power generation, process heat, desalination, or other industrial applications.

Light water or other non-light water coolants, such as a gas, liquid metal, or molten salt, may be used as a coolant in SMR designs.

Thus, B and D are correct options.

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The chemical equation for the formation of carbonic acid (H₂CO₃) from carbon dioxide (CO₂) and water (H₂O) is as follows:

CO₂ (g) + H₂O (l) ⇌ H₂CO₃ (aq)

A chemical equation is a representation of a chemical reaction using chemical formulas and symbols. It indicates the reactants, products, and their respective stoichiometric coefficients. The chemical equation provides information about the identities and quantities of the substances involved in the reaction.

A balanced chemical equation represents the conservation of atoms, meaning that the number of atoms of each element is the same on both sides of the equation.

In this equation, carbon dioxide reacts with water to form carbonic acid. The reaction can go in both directions, indicating the equilibrium nature of the process.

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Answer:

Industrial activity increases the emission of greenhouse gases in the atmosphere, especially carbon dioxide (CO2), and it negatively affects climate by increasing global warming.

Two actions to face the global warming:

1- To substitute the use of fossil fuels by alternative clean energy sources such as, for example, hydroelectric, geothermal, solar and wind energy resources.  

2- The government's policies decided to develop electric cars and to stimulate healthy habits such as walking instead of the use of conventional fossil-fueled transport modes.

To make 100 grams of NaCl, approximately 58.44 grams of sodium is required.

To calculate the amount of sodium required to produce a certain mass of NaCl, we need to consider the molar mass of sodium and the stoichiometry of the reaction. The molar mass of sodium (Na) is 22.99 g/mol, and the molar mass of chloride (Cl) is 35.45 g/mol. The chemical formula for sodium chloride (NaCl) indicates that one mole of sodium reacts with one mole of chloride to produce one mole of NaCl.

Using the given information, we can set up a proportion:

Molar mass of Sodium/Mass of Sodium = Molar mass of NaCl/Mass of NaCl

​

Substituting the values:

x /22.99g/mol= 100g / 58.44g/mol

Cross-multiplying and solving for \(x\), we find:

x= 22.99/ 58.44 ×100   g

Therefore, approximately 39.39 grams of sodium are required to produce 100 grams of NaCl.

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Answer:

The pressure is equal to 0.775 atm.

Explanation:

Given that,

The atmospheric pressure on Stevens pass was measure to be 589mmHg.

We need to find the pressure in atm.

We know that,

1 standard atmosphere = 760 mm Hg

1 mm Hg = (1/760) standard atmosphere

589 mm Hg = (1/760)× 589 standard atmosphere

= 0.775 standard atmosphere

Hence, the pressure is equal to 0.775 atm.

Exergonic: Reactions with negative delta G°’ values are exergonic reactions that release free energy.Exergonic means that the reaction will occur spontaneously. The value of delta G°’ is less than zero.

Endergonic: When the delta G°’ value is positive, the reaction is endergonic. These are reactions that need to be powered by an external force to occur.

At equilibrium: When delta G°’ = 0, the reaction is at equilibrium. The forward and reverse reactions occur at the same rate, and the concentrations of reactants and products do not change. Thus, the reaction is at equilibrium.

Here is how the K’eq values should be matched with the appropriate delta G°’ values:

K'eq  a. 1 : 0kJ/mol  b. 10⁻⁵ : 22.84 kJ/mol c. 10⁴ : -28.53 kJ/mol  d. 10² : -5.69 kJ/mol  e. 10⁻¹ : 11.42 kJ/mol AG°' (kJ/mol)

Therefore, the correct match for K’eq values with the appropriate delta G°’ values are as follows:

K'eq = 10⁴ corresponds to delta G°’ = -28.53 kJ/mol, which is exergonic.

K'eq = 10⁻⁵ corresponds to delta G°’ = 22.84 kJ/mol, which is endergonic.

K'eq = 10² corresponds to delta G°’ = -5.69 kJ/mol, which is exergonic.

K'eq = 1 corresponds to delta G°’ = 0 kJ/mol, which is at equilibrium.

K'eq = 10⁻¹ corresponds to delta G°’ = 11.42 kJ/mol, which is endergonic.

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Answer:

chromatography: Involves solvent separation on a solid medium. distillation: Takes advantage of differences in boiling points. evaporation: Removes a liquid from a solution to leave a solid material. filtration: Separates solids of different sizes.

hoep this helps

have a good day :)

Explanation:

Answer:

4.1/  \(\frac{41}{10}\)

Explanation

Do the calculation carefully because this calculation has negative term.

I hope you will understand.

3/8 + 7/2 + (-3/5) + 9/8 + (-3/2) + 6/5​

31/5+(-3/5)+(-3/2)

41/10

4.1

The specific heat capacity of the alloy that requires 49.1 kj to raise the temperature of 180.7 g alloy from 217 k to 489 k is approximately 0.815 J/g°C.

Using the formula below, we can calculate the alloy's specific heat capacity (c) in joules per gram per degree Celsius (J/g°C):

q = mcΔT

Where q is the heat energy, m is the mass of the alloy, c is the specific heat capacity of the alloy, and T is the temperature change in degrees Celsius.

provided values

Given that 1 kJ = 1,000 J, q = 49.1 kJ = 49,100 J.

m = 180.7 g

ΔT = 489 K - 217 K = 272 K

We can find c by rearranging the formula:

c = q / (m * ΔT)

replacing the specified values:

c = 49,100 J / (180.7 g * 272 K)

c ≈ 0.815 J/g°C

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