what is the total pressure in a 10.0 l flask which contains 0.127 mol h2 (g) and 0.288 mol of n2 (g) at 20.0 °c?

Answer:

Single celled organism

Explanation:

They fall under two categories:

Eukaryotes and prokaryotes.

Eukaryotes: Evolved from prokaryotes, they are larger and more complex. Unlike prokaryotes, they have a nucleus. Can be single celled or multicellular.

Prokaryotes: Oldest cell type, small and simple. They do not have a nucleus. Open unit with no compartments.

The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.

Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.

The general form of a single displacement reaction can be represented as:

\(A + BC \longrightarrow B + AC\)

When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.

\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)

Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.

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Answer:

Explanation:

To predict the final structure of the compound based on the given information, we can analyze the degrees of unsaturation, the IR peaks, and the NMR peaks.

Degrees of unsaturation:

The formula \(C_{10}H_{12}O\) implies a saturated compound with (2n + 2) hydrogens, where n is the number of carbons. Therefore, for 10 carbons, we expect (2 * 10) + 2 = 22 hydrogens for a fully saturated compound. However, the actual number of hydrogens given is 12. The difference between the expected and actual hydrogens indicates the presence of five degrees of unsaturation (double bonds or rings).

Suspected bonds from IR:

- The peak at 3050 cm^-1 suggests the presence of an aromatic C-H bond.

- The peak at 1675 cm^-1 indicates the presence of a carbonyl group (C=O).

- The peaks at 1620 cm^-1 and 850 cm^-1 are not commonly associated with specific functional groups but may provide additional information.

Fragment(s) from 1H NMR:

- The peaks at 7.85 ppm and 7.28 ppm indicate two sets of aromatic protons (2H doublet each).

- The peak at 2.9 ppm represents a set of aliphatic protons (2H quartet).

- The peaks at 2.0 ppm and 1.5 ppm correspond to a methyl group (3H singlet) and a methyl group adjacent to a quaternary carbon (3H triplet), respectively.

Based on this information, a possible structure that fits the given data is:

      H       H

       |        |

H - C = C - C - C - C - C - C - C - C - C - O - H

       |        |

       H       H

In this structure, there are five degrees of unsaturation (four double bonds and one ring). The peaks in the IR and NMR spectra are consistent with the expected functional groups and proton environments.

Please note that there may be alternative structures that could also fit the given information, and additional experimental data would be necessary to confirm the final structure.

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Geologic maps are most recognized by their contour lines, which represent different elevations. Option C

This is further explained below.

Generally, A geologic map, also known as a geological map, is a specialized map that is drawn out for the purpose of illustrating different geological phenomena.

The various rock units and geologic layers may be represented by different colors or symbols.

contour line: A curve along which a function has a constant value represents a contour line for a function with two variables.

This means that the curve unites points that have the same value at each point along the curve. It is a segment of the plane that is parallel to the plane that is taken from the three-dimensional graph of the function f.

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The molar flow rate of hydrogen is approximately 0.0003884 mol/s.

To calculate the molar flow rate, we need to convert the volume flow rate from nanoliters per minute (nlpm) to moles per second (mol/s). Here's how you can do it:

Given:

Volume flow rate = 8.7 nlpm

Step 1: Convert volume flow rate to liters per second:

Volume flow rate (L/s) = Volume flow rate (nlpm) / 1000

Volume flow rate (L/s) = 8.7 nlpm / 1000 = 0.0087 L/s

Step 2: Convert volume flow rate to moles per second using the ideal gas law:

Molar flow rate (mol/s) = Volume flow rate (L/s) / molar volume (L/mol)

The molar volume depends on the conditions of temperature and pressure. Let's assume standard temperature and pressure (STP) conditions:

Standard temperature (T) = 273.15 K

Standard pressure (P) = 1 atm

At STP, the molar volume of an ideal gas is approximately 22.4 L/mol.

Molar flow rate (mol/s) = 0.0087 L/s / 22.4 L/mol

Molar flow rate (mol/s) ≈ 0.0003884 mol/s

Therefore, the molar flow rate of hydrogen is approximately 0.0003884 mol/s.

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Answer:

Condensation

Explanation:

The cold temperature around the tumbler cools down the water particles in the air around it. The particles condense and turn into water on the outside of the tumbler.

The statement is false. The relationship between the amount of reactant consumed and time is not curvilinear, but rather follows a specific pattern based on the reaction kinetics.

In most chemical reactions, the amount of reactant consumed with respect to time follows a linear or exponential relationship. In a linear relationship, the rate of reaction is constant, and the amount of reactant consumed increases linearly with time. This often occurs in simple reactions with a constant rate. In contrast, an exponential relationship is observed in many reactions governed by complex kinetics. Initially, the reaction rate is high, and the amount of reactant consumed is rapid. As the reaction progresses, the rate slows down, and the amount of reactant consumed per unit of time decreases exponentially. This can occur in reactions with multiple steps, intermediate species, or factors affecting the reaction rate. Therefore, the relationship between the amount of reactant consumed and time is typically linear or exponential, depending on the reaction kinetics, and not curvilinear.

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The experiments of wöhler, kolbe, miller, and other chemists invalidated the concept of vitalism by demonstrating that B) organic molecules could be produced apart from living organisms using inorganic materials.

Concept of vitalism propose that organic molecules could only be synthesised by living organism. Modern science said that vitalism has no credibility.

Adolph Wilhelm Hermann Kolbe (1818 - 1884) contributed to invalidate the concept of vitalism. He made the organic substance acetic acid from inorganic carbon disulfide.

Friedrich Wöhler (1800 - 1882) synthesis of the organic compound urea from inorganic substances.

Abiotic factors are non-living chemical and physical things of the environment.

Abiotic factors can include water, light, radiation, temperature, humidity, atmosphere, and soil.

On the contrary, biotic factors are all of the living organisms within an ecosystem.

Missing options:

A) carbon atoms were common in both living organisms and nonliving substances such as rocks and soil

B) organic molecules could be produced apart from living organisms using inorganic materials

C) tissues extracted from living organisms could still promote organic reactions

D) one organic substance could be transformed into another organic substance

E) complex organic substances are the result of a series of sequential synthetic reactions occurring in both living organisms and nonliving systems.

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The molecular geometry (form) of CCl4 SF6 is identical to the configuration of the electron domains in a VSEPR.

VSEPR distinguishes between molecular geometry, which defines how the atoms in a molecule are ordered, and electron group geometry, which expresses how electron groups (bonds and nonbonding electron pairs) are arranged.

Chemistry frequently employs the valence-shell electron-pair repulsion (VSEPR) model to foretell the three-dimensional organization, or geometry, of molecules. This model accounts for the repulsion between electron pair to estimate the structure of a molecule.

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Answer:

C. About 50 more grams ammonia would be able to dissolve as the solution has become unsaturated

Explanation:

From the question, we have;

The mass of ammonia dissolved in water = 60 grams

The mass of the water solvent which dissolves the ammonia = 100 g

The temperature to which the ammonia water solution is raised = 90°C

Therefore, given that the solubility of a solute in a solvent increases with temperature, when the temperature is raised, we have, that the solution will more unsaturated and will be able to dissolve more ammonia, therefore, option 'C' is the most correct option that corresponds with the relationship of temperature and solubility

Compound with hydrogen bonding will have the strongest intermolecular attractive forces while the one with only London dispersion forces will have the weakest.

Intermolecular forces (IMFs) are the forces between molecules that hold them together. They are crucial in understanding chemical reactions and behavior.

There are several types of IMFs:  hydrogen bonding,dipole-dipole, and London dispersion forces. Based on the structures alone, hydrogen bonding will cause the strongest intermolecular attractive forces.

Hydrogen bonding occurs when a hydrogen atom covalently bonded to an electronegative atom (F, O, or N) is also attracted to another electronegative atom on a different molecule.

This creates a strong attractive force between the two molecules. For example, water has hydrogen bonding between its molecules, which creates its unique properties, like high boiling point and surface tension.

On the other hand, London dispersion forces are the weakest intermolecular attractive forces. These forces are created by temporary dipoles in molecules when the electrons in a molecule are unevenly distributed.

This creates a very weak attractive force between two molecules. For example, methane (CH4) only has London dispersion forces between its molecules.

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When an aromatic ring is activated by an electron-donating substituent, such as a methyl group or a methoxy group, the rate of electrophilic aromatic substitution is increased.

The reaction of an electrophile with an aromatic compound is referred to as electrophilic aromatic substitution. The electrophile is generated by either a substitution or addition reaction.

The product is an aryl derivative of the initial compound, and the reaction is catalyzed by Lewis acids, such as ferric chloride, which boost the electrophile's reactivity or reduce the aromatic compound's electron density.

For example, bromination of benzene or toluene occurs by electrophilic aromatic substitution, and the products are bromobenzene or bromotoluene, respectively.

The rate of electrophilic aromatic substitution is increased when an aromatic ring is activated by an electron-donating substituent such as a methyl group or a methoxy group. The effect of these substituents on the reaction rate is due to their ability to donate electron density to the ring, making it more nucleophilic and hence more susceptible to attack by electrophiles.

Electron-donating substituents activate the aromatic ring by increasing the electron density at the ortho and para positions, which accelerates electrophilic substitution by increasing the nucleophilic nature of the aromatic ring.

The net impact of the substituent on the reaction rate is dependent on the substituent's nature and position relative to the reaction site.

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A first order process' rate constant, k, can be computed using the formula: k = 0.693/half-life.

A equation is a scientific statement indicating that two sums or values are equal, such as 6 x 4 = 12 x 2. When two or more components must be taken into account collectively in order to comprehend or describe the overall situation, this is known as an equation.

The meaning of an equation in algebra is a scientific statement that demonstrates the equality of two mathematical expressions. For instance, the equation 3x + 5 = 14 consists of the two equations 3x + 5 and 14, which are separated by the 'equal' sign.

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Therefore, the Henry's constant for helium at the given temperature and pressure is 100 μg/g-atm.

Henry's law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of the gas above the liquid. The proportionality constant is known as Henry's constant (kH) and depends on the gas, the liquid, and the temperature and pressure conditions.

In this case, we can use Henry's law to relate the partial pressure of helium in air (which is 0.003 times the atmospheric pressure) to the concentration of helium in water (which is 0.3 parts per million by mass, or ppm, which is equivalent to 0.3 μg/g). We can assume that the solubility of helium in water is low and that the concentration of helium in air does not change significantly upon dissolution in water.

The equation for Henry's law can be written as:

C = kH * P

where C is the concentration of the dissolved gas in the liquid, kH is Henry's constant, and P is the partial pressure of the gas above the liquid.

In this case, we know that C = 0.3 ppm (or 0.3 μg/g) and P = 0.003 * Patm (where Patm is the atmospheric pressure). We want to solve for kH.

kH = C/P

= (0.3 μg/g) / (0.003 * Patm)

The units of kH will be (μg/g)/(atm), which can also be expressed as (mol/L)/(atm) using the molar mass of helium and the density of water. At standard temperature and pressure (STP, 0°C and 1 atm), the molar volume of a gas is 22.4 L/mol. Therefore, the concentration of helium in air at STP is 0.3/22.4 = 0.0134 mol/L, and the partial pressure of helium is 0.003 * 1 atm = 0.003 atm.

Substituting these values into the equation, we get:

kH = (0.3 μg/g) / (0.003 atm * Patm/1 atm)

= 100 μg/g-atm

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From the table, it is very clear that as the crystallinity increases, its stiffness also increasing. The FCC structures are having less crystallinity and is more ductile than BCC structure.

Ductility of a material is the ability to make very thin elongated wires. Whereas, stiffness of a material is the resistance to any elongation or compression.

The more crystalline the material, more will be the stiffens. The material with higher Young's modulus  (Y) are more crystalline and stiff. As Y decreases, stiffness decreases, the material becomes ductile.

Because the body-centered cubic (BCC) lattice is not tightly packed despite being cubic, the face-centered cubic (FCC) crystalline structure has greater ductility than the BCC.

Due to the fact that a hexagonal close-packed (HCP) lattice is densely packed but not cubic, HCP metals are less ductile than BCC and FCC metals.

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The final temperature of the dinitrogen monoxide gas is  282.5 K.

According to Charles' law, an ideal gas's volume will change at constant pressure by the same amount that its temperature changes on the absolute temperature scale (measured in kelvins).

The volume of a gas is directly proportional to its absolute temperature when the pressure and the amount of gas are kept constant.

By the use of the Charles law;

V1/T1 = V2/T2

V2T1 = V1T2

T2 = V2T1/V1

= 69.77 * 319.84/ 78.982

= 282.5 K

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Fe(ii) ions are there in 20.0 g of FeSO4 (molar mass=151.9 g/mol) ? Avogadro number=6.022× 10²³ is 0.794× 10²³

Mole concept is used for finding out the no of molecules present in a given sample.

Given,

Given mass =20g

Molar mass = 151.9/mol

Avogadro number=6.022× 10²³

We know,

Number of moles= Given mass / Molar mass

Number of moles= 20 / 151.9

Number of moles= 0.132 moles

According to the equation,

FeSO₄ -----> Fe⁺² + SO₄⁻²

Now,

Number of molecules of FeSO₄ = 0.132 × 6.022 × 10²³

Number of molecules of FeSO₄ = 0.794× 10²³

It can be seen from equation,

No. of molecules of  FeSO₄ = no. of ions of Fe⁺² = no of ions of SO₄⁻²

No. of ions of Fe⁺² = 0.794× 10²³

Hence, No. of ions of Fe⁺² is 0.794× 10²³.

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Answer: The correct answer (not rounded) would be 7.93 × 1022 iron(II) ions

Hope that helps:)

Answer:

3.28

Explanation:

At some point it is best to write out an equation to cancel out the units you don't want and to get to the units that you do want.  So if you write this out in an equation, you can see how you get to the answer.

43 m           3.28 ft             ?  ft

--------   X    -----------  =   --------------

   1                  1 m                  1

You can see now that the meters on the top will cancel out the meters on the bottom so all you are left with is the feet unit.  When you write out the equation you put the unit on the bottom that you want to get rid of (meter).  You put the unit you want to get to on the top which is feet.   At this point you just have to know how many feet 1 meter is equal to and plug those number in.  1 meter is equal to 3.28 feet.

1) The reaction of a primary amide with LiAlH₄ would result in the reduction of the amide functional group to a primary amine.

2) The reaction of a primary amide with H₃O⁺ would result in the hydrolysis of the amide functional group to form a carboxylic acid and ammonia.

1) LiAlH₄ is a strong reducing agent commonly used for the reduction of carbonyl compounds. In the presence of LiAlH₄, the primary amide undergoes reduction, where the carbonyl group (-C=O) is transformed into a primary amine (-NH₂), resulting in the removal of the oxygen atom.

2) H₃O⁺ represents an acidic environment and can initiate the hydrolysis of amides. In the presence of H₃O⁺, the amide functional group undergoes hydrolysis through a reaction called acid hydrolysis. This process cleaves the amide bond, breaking it into a carboxylic acid and an amine. The amine formed in this case would be ammonia (NH₃).

Overall, the reaction of a primary amide with LiAlH₄ results in the reduction to a primary amine, while the reaction with H₃O⁺ leads to the hydrolysis of the amide, forming a carboxylic acid and ammonia.

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Answer:

Verdadero.

Explanation:

¡Hola!

En este caso, dado que las propiedades periódicas nos hablan de un comportamiento específico sobre los elementos en la tabla periódica, resulta primeramente necesario recordar que la electornegatividad nos dice que tan fuerte es un elemento para atraer electrones de valencia de otros elementos.

De este modo, inferimos que es verdadero, ya que de hecho la electronegatividad nos define el tipo de enlace, basado en la diferencia de electronegatividades de los elementos enlazados, de acuerdo con la imagen adjunta.

Saludos!

Answer: 3. No displacement, zinc is most reactive.

4. Calcium Chloride, Calcium is most reactive.

5. No displacement, Copper is most reactive

6. No displacement, Calcium is most reactive

7. Hydrogen Oxide, Hydrogen is most reactive

8. Carbon oxide, Carbon is most reactive

9. No displacement, Aluminum is most reactive

10. Potassium Kryptide + Lead, no displacement, Potassium is most reactive.

The pH of the buffer solution is b)4.83.

To find the pH of the buffer solution, you can use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). In this case, the acid is benzoic acid (HA) and its conjugate base is sodium benzoate (A-). The pKa of benzoic acid is given as 6.30 x 10^-5.

First, calculate the ratio of [A-]/[HA] by dividing the concentration of sodium benzoate by the concentration of benzoic acid: [A-]/[HA] = 0.15/0.25 = 0.6.

Then, substitute the values into the Henderson-Hasselbalch equation: pH = 6.30 x 10^-5 + log(0.6) = 4.83.

Therefore, the pH of the buffer solution is b)4.83.

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aniapsmxuansyxineydo

The number of proton will be 15 and number of electron will be 18.

In the nuclei of atoms, the proton is just a basic electrically charged particle with neutrons. The p symbol is used to represent it.

The electron is just a subatomic particle with a negative electric charge. It will find  easily in the surrounding nucleus. They are assumed to be elementary particles.

Calculation of number of proton and number of neutron shown below:

It is given that the atomic number of phosphorus is 15 . After adding three more electrons in the outermost orbital of the  phosphorus atom , new atomic number will be 18.

The atomic mass of the  phosphorus = 31.

The number of proton = number of electron = atomic number

So, the number of proton = 15

Due to gaining 3 electrons , the number of electrons will be 15+3 = 18

Therefore, the number of proton will be 15 and number of electron will be 18.

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Before recently, the CO2 levels varied between 150 ppm and 250 ppm before rising dramatically.

The forest, sometimes known as the climax stage, is the first stage of a succession performance. A lichen is an example of an early species that can be found in habitats like a forest.

Urban tree trunks and buildings had turned black due to sooty air pollution brought on by industrialization and home coal fires, which also killed out lichens. Thus, the melanic form of the moth was better hidden and more likely to live and create progeny, whereas the pale form was now more visible to predators.

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Answer:

6.8g of solute are needed

Explanation:

Percent by mass, (w/w%) is defined as the mass of solute in 100g of solution. A solution that is 3.4% contains 3.4g of solute in 100g of solution. That means to make 200g of solution are required:

200g solution * (3.4g solute / 100g solution) = 6.8g of solute are needed

The solid with the smaller lattice energy will be more soluble in water.

This is because the lattice energy represents the energy required to break apart the ionic solid and separate the ions. Therefore, the larger the lattice energy, the stronger the bonds between the ions and the more difficult it is for water molecules to break them apart and dissolve the solid. On the other hand, the smaller lattice energy means weaker bonds between the ions, making it easier for water molecules to interact with and dissolve the solid. So, solubility is inversely proportional to lattice energy.

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Answer:

Caffeine

Explanation:

In every study, there must be an independent variable and a dependent variable. The independent variable is being manipulated and its effect on the dependent variable is evaluated.

In this study, the independent variable is the administration of caffeine. Its effect on a rat's ability to learn the maze (dependent variable) is evaluated in the study.

Answer:

Option 2 or B

Explanation:

The base is partially dissociating into products.

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The correct answer is: The base is not dissociating into any ions.

When the position of equilibrium lies to the left, it means that the equilibrium favors the formation of the reactants rather than the products. In the context of a base being added to water, it implies that the base does not dissociate significantly into ions or dissociates only to a small extent.

When a base is added to water, it can undergo a process called ionization or dissociation, where it breaks apart into ions. In the case of a strong base, such as sodium hydroxide (NaOH), it completely dissociates into its constituent ions (Na+ and OH-) in water. This means that all the base molecules break apart, and a high concentration of ions is present in the solution.

However, if the base is weak or the equilibrium lies to the left, the base molecules do not dissociate significantly into ions. This can be due to factors such as the nature of the base or the conditions of the reaction. In such cases, only a small fraction of the base molecules dissociate into ions, and the concentration of ions in the solution is relatively low.

Therefore, when the position of equilibrium lies to the left, it indicates that the base is not dissociating into any ions or is dissociating only to a small extent. The base remains mostly in its molecular form and is present in the solution in relatively small amounts.

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