A Downs cell operating at 77.0 A produces 31.0 kg of Na.(c) How long did the cell operate?

To find the equilibrium mole fractions x1 and y1 of the liquid and vapor phases, we use Raoult's law, which relates the vapor pressure of a component to its mole fraction.

The formulas for x1 and y1 are x1 = z1(1 + (P2/P1 - 1)/(K1 - P2/P1)) and y1 = x1K1, respectively. The molar fraction v of the vapor phase is given by y1 plus the mole fraction of the other component (1 - y1).

The fractional recovery r of species 1 in the vapor phase is the ratio of the moles of species 1 in the vapor phase to the moles of species 1 in the feed. Remember to substitute the appropriate values for P1, P2, and K1 to obtain the specific results.

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Answer:

Ver explicacion

Explanation:

La gravedad es una fuerza que actúa a distancia. La fuerza que actúa entre la tierra y los cuerpos en ella es la fuerza gravitacional.

Es un ejemplo típico de una fuerza de acción a distancia.

Por lo tanto, la fuerza tat que existe entre la tierra y los cuerpos que se encuentran en ella es una fuerza de distancia.

To calculate the work that an object does when it moves covering a distance of 3000 meters when it is propelled by a force of 65 Newton, one of the principles of mechanics must be considered.

A force does work when there is a displacement of the center of mass of the body on which the force is applied, in the direction of said force.

The work of the force on that body will be equivalent to the energy necessary to displace it, so that:

W = F.d

Substituting the corresponding values in said formula:

F = 65N

d = 3000m

W = 65 N. 3000 m

W = 195000 W

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A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true

Answer:

Observations of the sky allowed explorers to mark the passage of time both in hours and through the months of the year. Early astronomers also realized that the night sky does not look the same from different places on the Earth.

Answer:

NO2 will diffuse faster.

Explanation:

Given in the pic.

Answer:

d

Explanation:

i think it's d, but I'm not sure. my answer is a little different but maybe i used a different number for the density of lead (11.35g/cc)

Answer:

The precise fit on the ring stand. The ability to hold more substance than a test tube. A shallow bottom to increase the surface area of a liquid, leaving the solid behind.

Explanation:

Q and A!

How does an evaporating dish work?

Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance. ... The dish is heated with a Bunsen burner, until only stable precipitate remains, which contains the silica content.

What does a evaporating dish looks like?

The evaporating dish is a small bowl with a spout, usually made of porcelain or borosilicate glass. As its name suggests, it is commonly used to evaporate solvents in a sample. The evaporating dishes we encounter in a chemistry lab usually accommodate small samples.

A - convection

B - conduction

C - radiation

D - convection

Answer:

l and t

Explanation:

because they are in group one

Answer:

L & T

since are found in the same group.

The assumption built into the TWA (time-weighted average) value with regard to years of exposure is that the exposure to the content loaded in a particular environment is spread out over a working career, which typically spans around 30 years.

Therefore, the TWA value is based on an average exposure over a period of time, assuming that an individual will work in that environment for a full career length. However, it should be noted that TWA values may vary depending on the specific type of content being measured and the associated health risks.

The assumption built into the Time Weighted Average (TWA) value with regard to years of exposure is "A working career." This typically means that the TWA value is calculated based on a worker's exposure to a substance or hazard over a 40-hour work week for a duration of approximately 30 years, which is considered a standard working career.

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Answer:

103.6°C

Explanation:

We solve this problem, with the Ideal Gases Law. We know that moles of gas are not changed through time.

P . V = n . R . T

So n (number of moles) and R (Ideal Gases constant) are the same, they are cancelled. In the two different states, we can propose:

P₁ . V₁ / T₁ = P₂ . V₂ /T₂

We need to make some conversions:

100 mL . 1 L/ 1000mL = 0.1L

500 kpa . 1atm / 101.3 kPa = 4.93 atm

300°C + 273 = 573 K

We replace data:

4.93 atm . 10L / T₂ = 750 atm . 0.1L / 573K

4.93 atm . 10L = (750 atm . 0.1L / 573K) . T₂

(4.93 atm . 10L) / (750 atm . 0.1L / 573K) → T₂

T₂ = 376.65 K

We convert K to °C →  376.65 K - 273 = 103.6 °C

Answer:

True

Explanation:

Answer:

Explanation:

1) make an observation that describes a problem,

2) create a hypothesis,

3) test the hypothesis, and

4) draw conclusions and refine the hypothesis.

Answer:

7.35 *2

Explanation:

Because I mole of Na2o is made of 2 moles of NaOH

Given the number of atoms or molecules, we need to use Avogadro's number, but first, let's review this concept: The number 6.02×10^(23 ) is called Avogadro's number, the number of representative particles in a mole or atom.

Remember that the symbol of tellurium is Te. Now, doing the conversion to moles we're going to obtain:

With this number, we can obtain the grams of tellurium using the molar mass that you can find in the periodic table which is 127.6 g/mol. The conversion from moles to grams will be:

So, 2.33 x 10^(23) atoms of Te are 49.38 of tellurium.

To illustrate the conversion between the two resonance structures, I'll provide a step-by-step explanation and draw the missing curved arrows for clarity. Let's assume we have a molecule with a conjugated system, and we want to convert the first resonance structure into the second one.

In the first resonance structure, we might have a double bond adjacent to a lone pair or an atom with an available p orbital. To convert it into the second resonance structure, we need to move the pi bond to a different position, allowing the electron density to shift. This movement of electrons is represented by curved arrows.

Here's the step-by-step process:

1. Identify the double bond and the atom or group with the available p orbital.

2. Begin by drawing a curved arrow from the pi bond towards the atom or group with the available p orbital. This arrow represents the movement of electrons from the pi bond to the atom or group.

3. Simultaneously, draw a curved arrow from the atom or group with the available p orbital towards the carbon atom that is adjacent to the double bond. This arrow represents the movement of electrons from the atom or group to the carbon atom.

4. Adjust the position of the double bond to the carbon atom that just received the electrons, and make sure to retain the correct number of lone pairs and formal charges.

5. The resulting structure should have a new double bond and a different arrangement of electrons, providing the second resonance structure.

Remember, resonance structures are hypothetical representations that show the distribution of electrons within a molecule. They contribute to the overall stability of the molecule by delocalizing electron density.

It's important to note that without specific details about the starting molecule or the atoms involved, it's challenging to provide an accurate and detailed example. However, this general procedure should guide you in drawing the missing curved arrows to convert between resonance structures in a conjugated system.

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Contamination of 2 g of diphenyl acetic acid with 0.2 g of benzoic acid is likely to result in a decrease in the melting point of diphenyl acetic acid.

Benzoic acid is a solid at room temperature with a melting point of 122.4°C. Diphenyl acetic acid is also a solid at room temperature and has a melting point of around 72-73°C. Mixing the two compounds will result in a mixture with a melting point that is lower than the melting point of diphenyl acetic acid alone. This is because the presence of benzoic acid interrupts the crystal lattice structure of diphenyl acetic acid, making it more difficult for the molecules to form a well-organized crystal structure. This results in a broader and lower melting point. The magnitude of the effect on the melting point of diphenyl acetic acid depends on the concentration of the benzoic acid and the identity of the solvent. In this case, the amount of contamination is significant relative to the mass of diphenyl acetic acid, so the decrease in the melting point is expected to be significant.

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Large metropolitan areas have difficulty dealing with solid waste because they lack suitable landfill sites nearby since the city is expansive and the correct option is option D.

Disposal of solid wastes is a stinging and widespread problem in both urban and rural areas in many developed and developing countries.

This is mainly due to the increasing generation of such solid waste and the burden posed on the municipal budget. In addition to the high costs, the solid waste management is associated lack of understanding over different factors that affect the entire handling system.

Thus, the ideal selection is option D.

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Answer:

it is a physical change  

Explanation:

When salt dissolves in water, there is a physical change. A new substance has not been created because the molecules of salt did not bond with the water

Answer:

Chemical here's why.

Explanation:

For example salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.

The statement in which La Niña affect the climate of the Pacific Ocean is "The cold water sinks deeper into the ocean."

La Niña is a climate phenomenon that depicts the cooling of surface ocean waters along the coast of South America's tropical west coast.

The average weather in a certain place over a longer length of time is referred to as climate.

The jet stream moves northward and weakens across the eastern Pacific as a result of La Niña. The South experiences warmer and drier weather than usual during La Nia winters. The North and Canada are wetter and colder than the rest of the country. The seas off the Pacific coast are cooler and contain more nutrients than typical during La Niña.

Water in the eastern Pacific is colder than typical because to La Niña. El Niño might cause the water to be warmer than usual in the same place. During La Niña years, drought-stricken areas are drenched, while El Niño years are drenched.

Hence the correct option is 2.

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Answer:

The answer is below

Explanation:

1. Fractional Distillation

2. Simple Distillation

3. Filtration

4. Steam distillation or lemon grass oil extraction

The cycle of citric acid Hydrogen atoms are transported to FAD during the conversion of succinate to fumarate. This process is catalyzed by a succinate dehydrogenase enzyme.

During the process of succinate dehydrogenation, succinate is oxidized to fumarate by losing electrons, which are transferred to FAD, reducing it to FADH2. This transfer of electrons from succinate to FAD is an oxidation-reduction reaction, also known as redox reaction. The energy released during this reaction is harnessed to generate ATP, which is an important energy currency for the cell. Succinate dehydrogenase is an enzyme complex that contains multiple subunits and cofactors, including flavin adenine dinucleotide (FAD) and iron-sulfur clusters. It is located in the inner mitochondrial membrane, which allows it to transfer electrons to the electron transport chain, leading to the production of ATP. It's important to note that the citric acid cycle is a crucial metabolic pathway that takes place in the mitochondria of eukaryotic cells, and it is also known as the TCA cycle or Krebs cycle. The cycle is a series of chemical reactions that converts acetyl-CoA, derived from carbohydrates, fats, and proteins, into carbon dioxide and water, releasing energy in the form of ATP, hydrogen atoms other high-energy molecules.

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Answer:

The number of tires required to power ten homes for one year is approximately 2,730 tires

Explanation:

The given information are;

The energy generated by burning one rubber tire = 250,000 BTUs

1 BTU = 0.0003 kW

The amount of energy consumed by the average American home = 10,000 kWh

Therefore, the amount of energy generated by burning one tire in kW can be found as follows;

The energy generated by burning one rubber tire = 250,000 BTUs

1 BTU = 0.0003 kW

∴ 1 BTU × 250,000 = 250,000 BTUs = 0.0003 kW × 250,000 = 75 kW

We note that 250,000 BTUs is equivalent to 263764 kJ

1 kWh is equivalent to 3600 kJ

10,000 kWh = 10,000 × 3600 = 36,000,000 kJ

The energy requirement for ten homes  for one year = 10 × 36,000,000 kJ = 360,000,000 kJ

At 50% efficiency, the energy produced per tire = 0.5 × 263764 kJ = 131,882 kJ

The electrical energy produced per tire = 131,882 kJ/tire

The number of tires required to power ten homes for one year = 360,000,000 kJ/  131,882 kJ/tire = 2,729.71293  ≈2,730 tires

The number of tires required to power ten homes  ≈2,730 tires.

Answer:

The attraction is a hydrogen bonding.

Explanation:

Based on the information on intermolecular forces, when a Hydrogen is specifically bonded with a Nitrogen, Oxygen or Fluorine, their bonding is called a hydrogen bond.

On calculating using conversions, John can select either the package of wood with (a) 3 pieces of 2000mm each or the one with (d) 6 pieces of 100cm each.

On conversion of units from mm and cm to m:

1m = 100cm

1m = 1000mm

Therefore,

Since John requires 6m of wood to build a diving board, using unit conversions:

3 pieces of 2000mm each:

2000mm = 2m = 2m x 3 = 6m

4 pieces of 1.5 cm each:

1.5cm = 0.015m x 4 = 0.06m

6 pieces of 100 mm each:

100mm = 0.1m x 6 = 0.6m

6 pieces of 100 cm each:

100cm = 1m x 6 = 6m

8 pieces of 200 mm each:

200mm = 0.2m x 8 = 1.6m

Result:

The package with 3 pieces wood of 2000mm each equals to 6m of wood.

Similarly, the package with 6 pieces wood of 100cm each equals to 6m of wood.

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Answer:

Hey

Explanation:

It is because the kinetic energy between particles increase and and the rate of effective collision between them increase so the rate of reaction increases.

Answer:

An unbalanced force? .

Pls give me feedback if thats not right.

Answer:

Na has the most similar configuration.

Explanation:

Na electron configuration: 1s²2s²2p⁶3s¹ or [Ne] 3s₁

Mg electron configuration: 1s²2s²2p⁶3s² or [Ne] 3s²

Be electron configuration: 1s²2s² or [He] 2s²

This is because Na and Mg are right next to each other in the same period (horizontal).

Answer:

Na has the most similar configuration. Na electron configuration: 1s²2s²2p⁶3s¹ or [Ne] 3s₁. Mg electron configuration: 1s²2s²2p⁶3s² or [Ne] 3s². Be electron configuration: 1s²2s² or [He] 2s². Na and Mg are right next to each other in the same period

The units for the rate constant of a reaction with the rate law, Rate = k[A][B], are given by M⁻¹s⁻¹.

In the rate law equation, Rate = k[A][B], the rate constant (k) represents the proportionality constant that relates the concentrations of reactants ([A] and [B]) to the rate of the reaction. The rate constant depends on the specific reaction and is determined experimentally.

To determine the units of the rate constant, we need to analyze the units of the rate and the concentrations of the reactants. In the given rate law equation, the rate is expressed in terms of concentration per unit time (M/s or mol/(L·s)).

The concentration of reactant A is represented by [A], which has units of M (molarity) or mol/L. Similarly, the concentration of reactant B is represented by [B] and also has units of M or mol/L.

By substituting the units into the rate law equation, we can deduce the units of the rate constant. The rate is given in M/s, and the concentrations [A] and [B] are in M. Therefore, the units of the rate constant k must cancel out the units of concentration, resulting in M⁻¹, and also account for the unit of time, which is s⁻¹.

Therefore, the correct answer for the units of the rate constant of a reaction with the given rate law is M⁻¹s⁻¹, which corresponds to option C.

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The solubility product, Ksp of barium phosphate is helpful to calculate the molar solubility and concentration of ions.

The equilibrium constant for a solid material dissolved in an aqueous solution is the solubility product constant, Ksp. It denotes the concentration at which a substance dissolves in solution. A material's Ksp value indicates how soluble it is - larger the Ksp value, the more soluble it is. Solubility equilibrium is a sort of dynamic equilibrium that occurs when a chemical substance in solid form is in chemical equilibrium with that compound's solution. The solid may dissolve unmodified, by dissociation, or through chemical reactivity with another solution element, such as acid or alkali. The solubility product is determined by the molar concentrations of the ions in saturated solutions, whereas the ionic product is determined by any solution.

Reaction:

\(Ba_3(PO_4)_2 \rightleftharpoons 3Ba^{2+} + 2PO_4^{3-}\)

The solubility product of barium phosphate, Ksp =  1.3 x \(10^{-29}\)

The expression of solubility product for barium phosphate is given as:

Ksp = \((3S)^3\) x \((2S)^2\) = 108 \(S^5\)

1.3 x \(10^{-29}\) x \((2S)^2\) = 108 \(S^5\)

\(S^5\) = 1.3 x \(10^{-29}\) / 108

S = 6.5479 x \(10^{-7}\)M

Concentration of barium ions = \([Ba^{2+}]\) = 3 x 6.5479 x \(10^{-7}\) = 1.9643 x \(10^{-6}\)M

Concentration of phosphate ions = \([PO_4^{3-}]\) = 2 x 6.5479 x \(10^{-7}\) = 1.3096 x \(10^{-6}\)M

Molar solubility of \([Ba_3(PO_4)_2] \frac{[Ba^{2+}]}{3}\) = 1/3 x 1.9643 x \(10^{-6}\) = 6.5479 x \(10^{-7}\)M

Solubility product of \(Ba_3(PO_4)_2\) = 6.5479 x \(10^{-7}\) x 601 = 0.0003935g/L

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