an oxide of rhenium crystallizes with rhenium atoms at each of the corners and oxygen atoms in the middle of each edge of the cell. what is the formula of the oxide?

The processes that occur are:

Methanol (CH3OH) Dissolution: CH3OH + H2O → CH3OH2+ + OH−

Hydrogen Chloride (HCl) Dissolution: HCl + H2O → H3O+ + Cl−

Sodium Hydroxide (NaOH) Dissolution: NaOH + H2O → Na+ + OH−

Methanol (CH3OH), hydrogen chloride (HCl) and sodium hydroxide (NaOH) all dissolve in water. When these compounds dissolve in water, different processes occur.

When methanol dissolves in water, it forms an ionic bond, where the positive hydrogen atoms of the methanol molecule interact with the negative oxygen atoms of the water molecule.

This process is known as hydrogen bonding, and is represented in the following equation: CH3OH + H2O → CH3OH2+ + OH−.

When hydrogen chloride dissolves in water, it undergoes hydrolysis, where the HCl molecule separates into a hydrogen ion (H+) and chloride ion (Cl-). This is represented in the following equation: HCl + H2O → H3O+ + Cl−.

Lastly, when sodium hydroxide dissolves in water, it forms an ionic bond, where the NaOH molecule separates into a sodium ion (Na+) and hydroxide ion (OH-).

This is represented in the following equation: NaOH + H2O → Na+ + OH−.

In summary, methanol undergoes hydrogen bonding, hydrogen chloride undergoes hydrolysis, and sodium hydroxide forms an ionic bond when dissolved in water.

The chemical equations and sketches for each process are included below:

Methanol (CH3OH) Dissolution: CH3OH + H2O → CH3OH2+ + OH−

Hydrogen Chloride (HCl) Dissolution: HCl + H2O → H3O+ + Cl−

Sodium Hydroxide (NaOH) Dissolution: NaOH + H2O → Na+ + OH−

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The coulombs of electricity used will be 9,650 C.

To calculate the coulombs of electricity used in this experiment, you must first determine the number of moles of SnSO4 that were reacted.

5.51 g of metallic tin produced indicates that 0.100 moles of SnSO4 were reacted.

Now, coulombs of electricity can be determined using the equation Q = I x t, where I is the current, and t is the time.

Using the information provided, we can determine that the coulombs of electricity used in this experiment is equal to (I x t) = (steady current x time until 5.51 g of metallic tin was produced).

The coulombs of electricity used in this experiment can also be determined by considering the Faraday’s constant, which states that the amount of electricity needed to completely react one mole of a substance is equal to 96,500 coulombs.

Since the reaction involves 0.100 moles of SnSO4, the amount of electricity used is equal to 0.100 moles x 96,500 coulombs, which is equal to 9,650 coulombs.

To summarize, the amount of coulombs of electricity used in this experiment is 9,650 coulombs, and this can be determined using the equation Q = I x t, or by considering the Faraday’s constant. This amount of coulombs of electricity was used until 5.51 g of metallic tin was produced.

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Answer:

c.no is a correct answer

Hydration occurs when minerals are dissolved in water. This means that minerals absorb water and expand. Hence, the correct answer is dissolved into water.

Hydration is the procedure of blending an element with water. It's a chemical reaction that takes place between a chemical compound and water molecules, which helps to break down and dissolve the substance being hydrated.

The hydration process in chemistry entails taking a substance and breaking it down into its component parts. This occurs when a compound or molecule takes in water, which results in the separation of the bonds between the atoms or ions.

The newly-formed ions interact with the water molecules, resulting in a new, hydrated compound.

Hydration can also occur naturally in the body. This is why it is essential to drink enough water throughout the day to remain hydrated. Therefore the correct answer is dissolved into water.

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The flow of energy during a chemical reaction involves the absorption of energy to break initial bonds, followed by the release of energy during bond formation. The net energy change, or enthalpy change, determines whether the reaction is exothermic or endothermic.

When bonds are broken and formed in a chemical reaction, energy is involved in this process. The flow of energy that takes place when bonds are broken and formed in a chemical reaction is called energy transfer. The transfer of energy takes place from one molecule to another molecule.

Hence, the term transfer of energy is used to describe the flow of energy that takes place in this process.

According to the law of conservation of energy, energy cannot be created nor destroyed, but it can be transformed from one form to another. Therefore, when a bond is broken, energy is absorbed or gained by the molecule, and when a bond is formed, energy is released or lost by the molecule.

Thus, in a chemical reaction, when a bond is broken, energy is absorbed by the molecule, and when a bond is formed, energy is released by the molecule. The energy released during a chemical reaction is called exothermic, and the energy absorbed during a chemical reaction is called endothermic.

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169.0 g of [tex]AuCl _{3}[/tex] can liberate 118.4 g of [tex]Cl_{2}[/tex] gas upon decomposition. The molar mass of [tex]AuCl _{3}[/tex] is 303.33 g/mol, which means that 1 mole of [tex]AuCl _{3}[/tex]contains 3 moles of chlorine (3 atoms of chlorine).

To determine the moles of [tex]AuCl _{3}[/tex]in 169.0 g, we divide the mass by the molar mass:

169.0 g / 303.33 g/mol = 0.557 moles of [tex]AuCl _{3}[/tex]

Since each mole of [tex]AuCl _{3}[/tex] produces 3 moles of chlorine, the total moles of chlorine that can be liberated from the decomposition of 0.557 moles of [tex]AuCl _{3}[/tex]is:

0.557 moles x 3 = 1.671 moles of [tex]Cl_{2}[/tex]

Finally, we use the molar mass of chlorine ([tex]Cl_{2}[/tex]), which is 70.90 g/mol, to convert the moles of [tex]Cl_{2}[/tex]to grams:

1.671 moles x 70.90 g/mol = 118.4 g of [tex]Cl_{2}[/tex]

Therefore, 169.0 g of [tex]AuCl _{3}[/tex]can liberate 118.4 g of [tex]Cl_{2}[/tex]gas upon decomposition.

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The percent by weight (w/w%) of sugar in soda, assuming the average mass of sugar in soda is 31.0 g and the total mass is 370.0 g, is 8.38%.

The mass percent composition of a compound is a measure of the ratio of the mass of each component to the total mass of the compound. It is denoted by w/w%.

The mass percentage of a component in a solution can be calculated using the following formula:

the mass percent of a component = (mass of the component ÷ total mass of solution) × 100

Assume the average mass of sugar in soda is 31.0 g and the total mass is 370.0 g.

To determine the weight percentage of sugar in soda, the mass percent composition formula can be used as follows:

mass percent of sugar = (mass of sugar ÷ total mass of soda) × 100

mass percent of sugar = (31.0 g ÷ 370.0 g) × 100

mass percent of sugar = 0.0838 × 100

mass percent of sugar = 8.38%

Therefore, the percent by weight (w/w%) of sugar in soda, assuming the average mass of sugar in soda is 31.0 g and the total mass is 370.0 g, is 8.38%.

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Answer: The molarity of the solution formed by dissolving 10.0g of Ca(NO3)2 in 250 mL of aqueous solution is

0.244 M.

The molarity of the solution formed by dissolving 10.0g of Ca(NO3)2 in 250 mL of aqueous solution can be calculated using the following equation: Molarity (M) = (moles of solute / liters of solution).

In this case, we have 10.0 g of Ca(NO3)2, so we first need to convert it to moles. To do this, we multiply the grams of Ca(NO3)2 by its molar mass, which is 164.08 g/mol: 10.0 g × (1 mol/164.08 g) = 0.061 mol.

We also have 250 mL of aqueous solution, which is equivalent to 0.25 L. Plugging these values into the equation above gives us: M = (0.061 mol/0.25 L) = 0.244 M.

Therefore, the molarity of the solution formed by dissolving 10.0g of Ca(NO3)2 in 250 mL of aqueous solution is 0.244 M.

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The polarity of a molecule is determined by both the type of bonds and the shape of the molecule. Polar bonds result in a molecule being polar, while non-polar bonds result in a molecule being non-polar. The shape of the molecule can also affect the polarity of the molecule. Molecules that are symmetrical are non-polar, while those that are asymmetrical are polar.

Polar bonds occur when two atoms share electrons unequally, leading to a permanent dipole moment. These molecules are said to be polar. On the other hand, non-polar molecules occur when the atoms involved in the bond share electrons equally, resulting in a non-polar molecule.

The shape of the molecule also plays a role in determining the polarity of the molecule. If the shape of the molecule is symmetrical, with an equal distribution of electrons, then it is considered non-polar.  

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Answer: To prepare 1.15 L of 0.100 M Nitric Acid from a 70.3% by mass concentrated solution with a density of 1.41 g/ml, you must use 2.765 g of the concentrated solution.

In order to prepare 1.15 L of 0.100 M Nitric Acid from a 70.3% by mass concentrated solution with a density of 1.41 g/ml, you need to first calculate the moles of Nitric Acid present in the 1.15 L of the solution. To do this, multiply the density of the solution (1.41 g/ml) by the volume of the solution (1.15 L) to obtain the mass of the solution (1.615 g). Then, divide the mass of the solution (1.615 g) by the molar mass of Nitric Acid (63.01 g/mol) to obtain the number of moles present in the solution (0.02547 moles).

Next, you must determine the volume of the concentrated solution required to obtain 0.100 M of Nitric Acid in 1.15 L of the solution. To do this, divide the number of moles of Nitric Acid required in the solution (0.100 moles) by the number of moles of Nitric Acid present in the 1.15 L solution (0.02547 moles) to obtain the volume of the concentrated solution needed (3.933 L).

Finally, you can calculate the amount of the concentrated solution required to make the desired 1.15 L of 0.100 M Nitric Acid solution. To do this, multiply the volume of the concentrated solution required (3.933 L) by the mass percentage of the concentrated solution (70.3%) to obtain the mass of the concentrated solution needed (2.765 g).

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The maximum amount of NaNO₃ that can be produced during the experiment is 9 moles

First, we shall obtain the limiting reactant. Details below:

Al(NO₃)₃ + 3NaCl -> 3NaNO₃ + AlCl₃

From the balanced equation above,

1 mole of Al(NO₃)₃ reacted with 3 moles of NaCl

Therefore,

4 moles of Al(NO₃)₃ will react with = 4 × 3 = 12 moles of NaCl

Thus, we can see that a higher amount of NaCl is needed to react with 4 moles of Al(NO₃)₃. Therefore, NaCl is the limiting reactant.

Finally, we can determine the maximum amount of NaNO₃ produced. Details below:

From the balanced equation above,

3 moles of NaCl reacted to produce 3 mole of NaNO₃

Therefore,

9 moles of NaCl will also react to produce 9 moles of NaNO₃

Thus, the maximum amount of NaNO₃ produced is 9 moles

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The temperature of the sample in degrees Celsius is 257.5 °C.

The temperature of the sample can be calculated using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

In this case, P = 2.17 atm, V = 68.83 L, n = 3.43 mol, and R = 0.08206 L atm mol-1 K-1.

Rearranging the equation will give us the equation for the temperature, T.

T = PV/nR

Pugging in the values, we get:

T = (2.17 atm)(68.83 L) / (3.43 mol)(0.08206 L atm/mol K)

T = 530.65 K

Converting Kelvin to degree Celcius, we have:

T = 530.65 - 273.15 = 257.5 °C

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The main reasons that gases deviate from ideal behavior are due to two factors: intermolecular forces and the volume of gas particles.

1. Intermolecular forces: In an ideal gas, it is assumed that there are no attractive or repulsive forces between the gas particles. However, in real gases, intermolecular forces do exist. These forces can cause gas particles to attract or repel each other, resulting in deviations from ideal behavior.

2. Volume of gas particles: Ideal gas laws assume that gas particles have no volume, meaning they are considered point masses. In reality, gas particles have a finite volume, which becomes significant at high pressures and low temperatures. This can also lead to deviations from ideal gas behavior.

In summary, gases deviate from ideal behavior mainly due to the presence of intermolecular forces and the volume of gas particles.

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The percent recovery of acetanilide recrystallization is: 75.5%,

the physical appearance of the purified acetanilide was: white, fine-grained crystals

and the melting point range of the purified acetanilide was: 114.6-116.9 °C

Explanation:

The percent recovery of acetanilide recrystallization is as follows: Initial weight of acetanilide = 2.245 g

Weight of filter paper = 0.343 g

Weight of filter paper + purified acetanilide = 2.633 g

Weight of purified acetanilide = (2.633 - 0.343) g = 2.290 g

Percent recovery = (Weight of purified acetanilide / Initial weight of acetanilide) × 100= (2.290 / 3.032) × 100 = 75.5%

Since the percent recovery is greater than 60%, we can say that the acetanilide recrystallization was successful at purifying the acetanilide.

The physical appearance of the purified acetanilide was white, fine-grained crystals, and the melting point range of the purified acetanilide was 114.6-116.9 °C. Both the physical appearance and melting point range confirm that the acetanilide was purified through the recrystallization process.

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The most common end product of the chemical weathering of feldspar is clay minerals.

Chemical weathering refers to the decomposition of rocks or minerals due to chemical reactions, water, or atmospheric gases.

The surface area of rocks or minerals is increased as they become more weathered, making them more susceptible to erosion. Clay minerals are the most common end product of the chemical weathering of feldspar.

This is because feldspar minerals are extremely reactive to acidic solutions in the environment, and they can easily become hydrolyzed.

Hydrolysis of feldspar:During hydrolysis, feldspar reacts with water to form clay minerals, silica, and soluble salts.

The hydrolysis reaction:KAlSi3O8 + 2H2O → Al2Si2O5(OH)4 + 4SiO2 + K+ + 2H+ + 2OH-Albite,

which is a type of feldspar, reacts with water to create kaolinite clay minerals, which is the most common end product of the reaction.

This reaction results in an increase in volume, which causes the rock to crack and disintegrate.

The reaction also produces silica, potassium, and aluminum ions, which can be transported by water to other locations.

Chemical weathering of feldspar has a significant impact on soil formation and the availability of nutrients in the environment.

The most common end product of the chemical weathering of feldspar is clay minerals, which plays a vital role in soil structure and plant growth.

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1. The concentration of the hydronium ion, [H₃O⁺] is 3.02×10⁻¹⁰ M

2. The concentration of the hydroxide ion, [OH⁻] is 3.31×10⁻⁵ M

The concentration of the hydronium ion, [H₃O⁺], can be obtained as follow:

pH of a solution is given by the following formula:

pH = -Log [H₃O⁺]

Inputting the various parameters, we have

9.52 = -Log [H₃O⁺]

Multiply through by -1

-9.52 = Log [H₃O⁺]

Take the anti-log of -9.52

[H₃O⁺] = Anti-log -9.52

[H₃O⁺] = 3.02×10⁻¹⁰ M

The value of the the hydroxide ion, [OH⁻], can be obtained as follow:

[H₃O⁺] × [OH⁻] = 10¯¹⁴

3.02×10⁻¹⁰ × [OH⁻] = 10¯¹⁴

Divide both side by 3.02×10⁻¹⁰

[OH⁻] = 10¯¹⁴ / 3.02×10⁻¹⁰

[OH⁻] = 3.31×10⁻⁵ M

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One of the major reasons that physical properties do not differ much from one gaseous substance to another is that gases have weak intermolecular forces between their particles.

The physical properties of a substance are those characteristics that can be measured or observed without causing any change in the substance's identity or composition.

The physical properties of gases include their volume, mass, pressure, temperature, and density.

Boyle's law, Charles's law, and Avogadro's law are three important gas laws that help to describe the physical behavior of gases.

Boyle's law describes the relationship between volume and pressure at a constant temperature.

Charles's law describes the relationship between volume and temperature at a constant pressure.

Avogadro's law describes the relationship between volume and the number of particles at a constant temperature and pressure.

Gases can expand or contract based on the conditions under which they are being held. Gases are highly compressible, and they fill any container that they are placed in.

Because gases have weak intermolecular forces, they can move about freely and do not have a fixed shape.

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In order to prepare benzoic acid, the reactants that could be used are Na/NH2 and Reactant A Reactant B O3. In a chemical equation, a chemical reaction is described using chemical formulas and symbols.

Benzoic acid is a white crystalline powder that is somewhat soluble in water. It has a mild, sweet odor and a sour, astringent flavor. It is an organic acid that occurs naturally in several plants and animals' tissues. Benzoic acid is a colorless crystalline solid that is an important precursor for the synthesis of many other organic compounds.

Benzoic acid can be prepared by reacting a Grignard reagent with carbon dioxide, reducing the resulting carboxylic acid, or from toluene using the Perkin reaction. The reactants that could be used to prepare benzoic acid are: Na/NH2Reactant A Reactant B O3. The chemical equation for the preparation of benzoic acid from Na/NH2 is:

C6H5NO2 + 3H2 => C6H5COOH + 2NH3

The chemical equation for the preparation of benzoic acid from Reactant A Reactant B O3 is:

C6H5CH3 + 2O3 => C6H5COOH + H2O + O2

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The percent ionization of a solution having a pH of 4.35 and an initial weak acid concentration of 0.00019 is 0.00021%.

To calculate this, first calculate the [H3O+] concentration.

This can be done by taking 10 raised to the power of the pH value, which in this case is 10^-4.35 = 3.2x10^-5 M.

Then, calculate the ionization fraction (alpha) using the equation alpha = [H3O+]/[HA], where [HA] is the initial weak acid concentration. In this case, alpha = 3.2x10^-5/0.00019 = 0.00021.

Finally, convert the ionization fraction to percent ionization using the equation Percent Ionization = 100 * alpha.

Thus, the percent ionization of the given solution is 0.00021 * 100 = 0.021%.

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The final NaCl concentration when 279 ml of a 0.840 m NaCl solution is mixed with 442 ml of a 0.220 m NaCl solution is 0.46 m NaCl.

To calculate this, the formula for mixing two solutions of different concentrations is:
C₁V₁ + C₂V₂ = CfVf,

where C₁ and C₂ are the concentrations of each solution, V₁ and V₂ are the volumes of each solution, and Cf and Vf are the final concentration and volume, respectively.

Using the formula, we can calculate the final NaCl concentration to be 0.476 m by solving for Cf.

Cf = (C₁V₁ + C₂V₂) / Vf

Cf = ((0.840 m × 279 ml) + (0.220 m × 442 ml)) / (279 ml + 442 ml)

Cf = 0.476 m NaCl.

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In the "Reactions" section of your Pre-lab notebook, you should have two reaction schemes involving the alkene. The correct answer is option d.

The Pre-lab notebook is a collection of worksheets and pre-lab assignments that students must finish before lab. This may include preparing solutions, making graphs, filling out data tables, or writing lab reports.A pre-lab notebook is a place where students may record and evaluate their work before and during a laboratory session. It is a document that is kept by the student and used to help them comprehend the material that is presented to them.

The Pre-lab notebook is divided into three sections: the Procedures section, the Data section, and the Reactions section. An alkene is a hydrocarbon that contains a carbon-carbon double bond. Alkenes are typically unsaturated and highly reactive. Alkenes are used in a variety of industries, including the production of plastics, synthetic rubbers, and fibers. Alkenes are also used as solvents in many applications.

They are known for their ability to react with a variety of other compounds. This will ensure you cover a range of possible reactions and provide a comprehensive understanding of the alkene's behavior in different situations.

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The number of moles of OH- in 55.85 mL of 0.350 M NaOH is 0.01976 moles.

This can be calculated using the following equation:
the number of moles of OH- in 55.85 mL of 0.350 M NaOH is 0.01976 moles with 3 significant figures.
To determine the number of moles of OH⁻ present in 55.85 mL of 0.350 M NaOH, we use the formula;

Molarity = Moles of solute ÷ Volume of solution in L

It can be simplified to:

Molarity = Moles of solute ÷ (Volume of solution in mL ÷ 1000)Moles of solute = Molarity × (Volume of solution in mL ÷ 1000)

Thus, the number of moles of OH⁻ present in 55.85 mL of 0.350 M NaOH is given by;

Moles of OH⁻ = 0.350 M × (55.85 mL ÷ 1000) = 0.0196 moles

Therefore, there are 0.0196 moles of OH⁻ present in 55.85 mL of 0.350 M NaOH.

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The volume of the soft drink that is 10.5% sucrose by mass is 718.86 mL.

To find the volume of a soft drink that contains 78.5 g of sucrose (C₁₂H₂O₁₁) with 10.5% sucrose by mass, we can start by calculating the total mass of the solution. This can be calculated using the following equation:

total mass = 78.5 g / 0.105 = 747.619 g

The 10.5% sucrose by mass means that for every 100 g of the soft drink, 10.5 g is sucrose.

As the density of the solution is 1.04 g/mL, the volume of the solution is calculated by dividing the mass of solution by the density of the solution.

V = 747.619 g / 1.04 g/mL = 718.86 mL

Therefore, the volume of the soft drink is 718.86 mL.

It is important to note that the calculation used in this example assumes that the sucrose (C₁₂H₂O₁₁) is the only solute in the solution. If there are other solutes present in the solution, then the calculation needs to be adjusted accordingly.

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When adding the measurements 42. 1014 g + 190. 5 g, we get  7 significant figures. Those 7 significant figures are 2, 3, 2, 6, 0, 1 and 4.

Significant figures can be defined as the number of digits in a value which is often a measurement which contribute to the degree of accuracy of the value. We can start counting all the significant figures by starting the first non-zero digit. Significant figures of a number in positional notation are defined as digits in the number that are reliable and necessary to indicate the quantity of something. All zeros that occur between any two non zero digits are significant figures. Significant figures are known as the digits of a number which are meaningful in the terms of accuracy or in the term of precision. That involves any non-zero digits. When we are adding the measurements 42. 1014 g + 190. 5 g, the predicted 7 significant figures as it appears between the two non zero digits.

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The complete question is,

When adding the measurements 42. 1014 g + 190. 5 g, the answer has ----------Significant figures.

The enthalpy change when 100. g of ice at 0.0°C is heated to liquid water at 50.0°C is equal to 333J/g x 100g = 33300 J.

This is because the heat of fusion of water is 333J/g and it takes 33300J of energy to melt 100g of ice at 0.0°C.

The process of melting the ice can be broken down into two steps. First, the ice needs to be heated from 0.0°C to its melting point (0.0°C).

This requires energy to overcome the intermolecular forces that are keeping the ice solid, but no heat is absorbed or released. Second, the ice needs to be heated from its melting point to 50.0°C.

This is when the heat of fusion is released and 333J of energy is absorbed for every gram of ice melted. Therefore, 333J/g x 100g = 33300J of energy must be supplied to the system for the ice to melt and reach 50.0°C.

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The statement that describes how a chain reaction results from the nuclear fission of uranium-235 is:  It produces neutrons that strike other nuclei and cause more fission.

Option C.

When a neutron strikes the nucleus of a uranium-235 atom, the nucleus splits into two smaller nuclei and releases two or three neutrons.

These neutrons can then go on to strike other uranium-235 nuclei, causing them to undergo fission and releasing more neutrons. This process continues in a chain reaction, producing a large amount of energy in the form of heat.

However, in order to sustain the chain reaction, there must be enough uranium-235 present and the neutrons must be slowed down to increase the probability of their striking other nuclei.

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Answer:

The reaction between butanoic acid and ethanol produces ethyl butyrate and water, and the balanced chemical equation is:

Butanoic acid + Ethanol → Ethyl butyrate + Water

The molar mass of butanoic acid is 88.1 g/mol, and the molar mass of ethanol is 46.1 g/mol. The molar mass of ethyl butyrate is 116.2 g/mol.

To determine the amount of ethyl butyrate produced, we need to use stoichiometry and the given mass of butanoic acid to find the number of moles of butanoic acid, and then use the mole ratio to find the number of moles (and mass) of ethyl butyrate produced.

Calculate the number of moles of butanoic acid:

moles of butanoic acid = mass/molar mass = 7.00 g / 88.1 g/mol = 0.0795 mol

Use the mole ratio to find the number of moles of ethyl butyrate produced:

From the balanced equation, we see that 1 mole of butanoic acid reacts with 1 mole of ethanol to produce 1 mole of ethyl butyrate.

So, the number of moles of ethyl butyrate produced = 0.0795 mol (since we assume a 100% yield)

Calculate the mass of ethyl butyrate produced:

mass of ethyl butyrate = moles x molar mass = 0.0795 mol x 116.2 g/mol = 9.23 g

Therefore, 9.23 grams of ethyl butyrate would be synthesized if 7.00 grams of butanoic acid were reacted with excess ethanol, assuming a complete 100% yield.

The partial pressure of CH4 in the mixture is 239 torr.

To find the partial pressure of CH4 in the mixture, we need to use the mole fraction of CH4.

First, we need to find the moles of each component in the mixture. The molar mass of CH4 is 16.04 g/mol, so:

moles of CH4 = 90.0 g / 16.04 g/mol = 5.61 mol

The molar mass of Ar is 39.95 g/mol, so:

moles of Ar = 10.0 g / 39.95 g/mol = 0.250 mol

The total number of moles in the mixture is:

total moles = moles of CH4 + moles of Ar = 5.61 mol + 0.250 mol = 5.86 mol

Now we can find the mole fraction of CH4:

mole fraction of CH4 = moles of CH4 / total moles = 5.61 mol / 5.86 mol = 0.957

Finally, we can use the mole fraction to find the partial pressure of CH4 using Dalton's Law of Partial Pressures:

partial pressure of CH4 = mole fraction of CH4 x total pressure

partial pressure of CH4 = 0.957 x 250 torr = 239 torr

Therefore, the partial pressure of CH4 in the mixture is 239 torr.

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LiNHCH3 and an ester are combined to create a SNAc mechanism, the LUMO in this process is Option C- C-O σ* bond.

SNAc (substitution nucleophilic acyl-oxygen cleavage) is a chemical reaction mechanism used to substitute an acyl group for a nucleophile on an ester or a similar carbonyl compound. The mechanism is initiated by the formation of a covalent intermediate, followed by a nucleophilic attack by the nucleophile.

LiNHCH3 is a nucleophile that can participate in a SNAc reaction. When mixed with an ester, the LUMO (lowest unoccupied molecular orbital) of the ester is required for the reaction to occur. A LUMO can either be a π* bond or a σ* bond. The C-O σ* bond in the ester is the LUMO in this SNAc reaction, according to the question. therefore, the answer is C. C-O σ* bond.

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