The movement of substances from an area of low concentration to an area of high concentration is called what?

Answer:

Li3N

Explanation:

Li+N2=Li3N.........................

Answer:

4 Li(s)+O2(g) → 2 Li2O(s)

Explanation:

its right

Answer:

A its A 1.733

Explanation:

According to molar concentration, 0.576 liters of a 1.3 M solution can be made using 0.75 mole of CuCO₃.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Substitution gives, volume= 0.75/1.3= 0.576 liters.

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The angle between two of the phosphorus-chlorine bonds in the phosphorus tetrachloride (PCl4-) ion is approximately 109.5 degrees.

The phosphorus tetrachloride (PCl4-) ion has a tetrahedral molecular geometry, which means the four chlorine atoms are arranged symmetrically around the central phosphorus atom. In a tetrahedral arrangement, the bond angles between the central atom and the surrounding atoms are approximately 109.5 degrees.

The tetrahedral shape ensures that the bonding pairs of electrons and the lone pairs of electrons around the central phosphorus atom are as far apart as possible, minimizing electron repulsion and achieving stability.

Therefore, the angle between any two of the phosphorus-chlorine bonds in the PCl4- ion is approximately 109.5 degrees.

In the phosphorus tetrachloride (PCl4-) ion, the angle between two of the phosphorus-chlorine bonds is approximately 109.5 degrees. This angle is a result of the tetrahedral molecular geometry, which provides stability by maximizing the distance between bonding and lone pairs of electrons around the central phosphorus atom.

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C. N-O bonds have different bond length in nitromethane, but same bond length in methyl nitrite.
By drawing the resonance structures of nitromethane (CH3NO2) and methyl nitrite (CH3ONO), we can observe the following:

1. Nitromethane has one N-O bond and no resonance structures, meaning that the N-O bond length remains different.
2. Methyl nitrite has two N-O bonds and resonance structures, which involve the movement of electrons between the two N-O bonds. Due to this resonance, both N-O bonds have the same bond length as the electrons are distributed equally between the two bonds.

Hence, the correct option is C, as nitromethane has different N-O bond lengths and methyl nitrite has the same N-O bond lengths.

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Answer:B

Explanation:

.

The reducing agent in the redox reaction represented by the following cell notation is magnesium (Mg) in the cell notation: Mg(s) | Mg2+(aq) || Li+(aq) | Li(s).

In the given cell notation, the species on the left side of the cell notation (Mg) is undergoing oxidation, which means it is losing electrons and being oxidized. The species on the right side (Li) is undergoing reduction, which means it is gaining electrons and being reduced.

In a redox reaction, the reducing agent is the species that donates electrons to another species, causing it to be reduced. In this case, magnesium (Mg) is losing electrons and being oxidized, so it is the reducing agent in the reaction.

It's important to note that the reducing agent is always the species that is being oxidized in a redox reaction, as oxidation and reduction occur simultaneously.

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The average atomic mass of Raiderium = 43.847amu

Average atomic mass = f1M1 + f2M2 + f3M3

where,

f is the fraction representing the natural abundance of the isotope

M is the mass number (weight) of the isotope.

(0.74655)(43.064amu) + (0.24958)(46.125amu) + (0.00387)(47.982amu)  = 43.847amu

Atomic mass (ma or m) is the mass of an atom. Although the SI unit of mass is the kilogram (symbol: kg), atomic mass is often expressed in the non-SI unit Dalton (symbol: Da) – the equivalent of the unit atomic mass unit (u). 1 Da is defined as 1⁄12 of the mass of a free carbon-12 atom at rest in the ground state. Protons and neutrons in the nucleus make up almost all of the total mass of atoms, and the ratio of electron binding energy and nuclear force is small. Thus, the numerical value of atomic mass expressed in Daltons is almost the same as the mass number.

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Answer:

5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

Explanation:

The balanced equation in this question is

Iron + Sulfur = Iron(II) Sulfide

Fe (II) + S --> Fe(II)S

Thus one mole of sulfur reacts with one mole of Fe(II)

Hence, 5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

The partial pressure of He in the tank, given that the tank contains 1.47 mole of O₂ and 5.53 moles of He is 9.56 atm

To obatin the partial pressure of He in the tank, we'll begin by obtaining the mole fraction of He in the tank. This is illustrated below:

Mole fraction of He = Mole of He / total mole

Mole fraction of He = 5.53 / 7

Mole fraction of He = 0.79

Finally, we shall determne the partial pressure of He in the tank. Details below

Partial pressure of He = mole fraction of He × total pressure

Partial pressure of He = 0.79 × 12.1

Partial pressure of He = 9.56 atm

Thus, we can conclude that the partial pressure of He is 9.56 atm

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After three half-lives, 12.5% of the original sample of polonium remains.

Polonium is a very infrequent natural element. It is found in uranium ores but it is careless to extract it. It is obtained by bombarding bismuth-209 with neutrons to give bismuth-210, which then purifies to form polonium. All the industrially produced polonium in the world is made in Russia.Po-210 is an effect of the radioactive decay of uranium-238, which decays to radon-222 and then to polonium. Polonium 210 has a half-life of 138 days. Let the opening value of polonium-218 be 100. First half-life. Therefore, 6.25 % of the original sample remains after 4 half-lives that are 12 minutes. Element Polonium has atomic Number 84, p-block, Mass number is 209.

So we can conclude that polonium is a radioactive, silvery-gray, or black metallic element of the oxygen group in the periodic table.

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c) plot ln [x] versus time and determine the magnitude of the slope.

What is a rate constant?

The rate and direction of a chemical reaction are quantified in chemical kinetics by the reaction rate constant, or reaction rate coefficient, k. 

For reactants A and B to combine to generate the product C

a A + b B → c C

The reaction rate frequently takes the following form:

\(r=k(T)[A]^{m} [B]^{n}\)

Here, [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is occurring throughout the volume of the solution, and k(T) is the reaction rate constant that varies on temperature.

Check the attached file for the graph.

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Check the attached file for the graph

Answer:

using a hot plate to boil water

Explanation:

the others require a chemical reaction to produce heat

The mixture of spaghetti and meatballs is heterogeneous.

Heterogeneous and homogeneous mixtures are the two types of mixtures. While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

A mixture is said to be homogenous if its composition is constant throughout. Because the dissolved salt is evenly distributed throughout the whole saltwater sample, the salt water described above is homogenous.

There are five different types of heterogeneous mixtures: suspensions, colloids, liquids, gases, and solids.

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The average atomic mass of the element in the data table is 35.8738 amu.

The average atomic mass of an element can be calculated by taking into account the abundance of each isotope of the element and the atomic mass of each isotope. The formula for calculating the average atomic mass is:

Average atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2) + ...

In the data table you provided, there are three isotopes of an element with atomic masses of 0.3365 amu, 35.97 amu, and 37.96 amu, and corresponding abundances of 0.0632%, 99.60%, and 0.3%, respectively.

Using the formula, we can calculate the average atomic mass as follows:

Average atomic mass = (0.3365 amu * 0.0632%) + (35.97 amu * 99.60%) + (37.96 amu * 0.3%)

Average atomic mass = 0.0002 amu + 35.7448 amu + 0.1188 amu

Average atomic mass = 35.8738 amu

Therefore, the average atomic mass of the element in the data table is 35.8738 amu.

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Answer: The concentration of hydrogen ion is 2.5 x 10∧-3.

Explanation:

It is well known that; pH + pOH = 14

∴ pH + 11.40 = 14

  pH = 14 -11.40 = 2.60

Remember that,

pH = - Log [ H+ ]

2.60 = - log [H+]

To get the  hydrogen ion concentration, we take the anti-log of 2.60.

[H+] = Antilog 2.60 = 2.5 x 10∧-3.

NADH carries electrons and hydrogens to the electron transport chain.

The main role of NADH and FADH₂ is to donate electrons and hydrogen to the electron transport chain. NADH stands for Nicotinamide Adenine Dinucleotide (NAD) + Hydrogen (H). It also plays an important role of generating energy in the body. During the electron transport chain both NADH and FADH₂ donate electrons by providing hydrogen molecules to the oxygen molecules to create water. Both Kreb's cycle and glycolysis produces NADH.

The NADH that are produced by the body are used for generating energy for the body. Supplements are also taken for NADH but they have some side effects like blood pressure and other effects.

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Answer:

Approximately \(0.35\; \rm W\) on average.

Explanation:

There are multiple to find power:

The question did not state the speed at which the arm of the chipmunk moves. However, the question did state the work done (\(W = 0.70\; \rm J\)) and the time required (\(t = 2\; \rm s\)).

Therefore, the equation \(P = W / t\) seem to be more suitable.

\(\begin{aligned}&P\\ &= \frac{W}{t} \\ &= \frac{0.70\; \rm J}{2\; \rm s} \approx 0.35\; \rm W\end{aligned}\).

According to the VSEPR theory, the shape of a molecule is determined by the repulsion between its electron pairs, both bonding and non-bonding.

In sulfuryl fluoride (SO2F2), the sulfur atom is surrounded by four regions of electron density: two single bonds with fluorine atoms and two double bonds with oxygen atoms. These four regions of electron density repel each other and arrange themselves as far apart as possible to minimize repulsion.

Since the molecule has no lone pairs of electrons, the electron density is evenly distributed among the four regions around sulfur. This results in a tetrahedral shape, where the fluorine atoms and oxygen atoms are arranged symmetrically around the central sulfur atom, with bond angles of approximately 109.5 degrees.

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Allylic carbocation is the reactive intermediate in the reaction of 1,3-diene with hbr, resulting in 1,4-addition.

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The correct option is Hydrobromic acid (hbr), This is the strong Acid when compared to the other acids

Hydrobromic acid is the term for aqueous HBr.

Hydrogen bromide will be the name if there is no water, or if it is not aqueous, while hydrobromic acid will be the name if it is acidic and aqueous. Because it is acid, the suffix ic is used, and because it is aqueous, the suffix hydro is used.

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The isothermal expansion caused the pressure of the argon gas to decrease from its initial value of essentially zero to 0.032 atm. Therefore final pressure of the argon gas is 0.032 atm.

In this problem, we are given the initial amount of argon gas (0.201 mol), the initial volume of the container (70.3 cm³), the final volume of the container (513 cm³), and the temperature (10.3 °C = 283.45 K). We are asked to find the final pressure of the gas after it undergoes an isothermal expansion.

Since the process is isothermal, the temperature remains constant, which means we can use the ideal gas law equation: PV = nRT. We can assume that the amount of gas and the temperature are constant, so we can rewrite the equation as P₁V₁ = P₂V₂, where P₁ is the initial pressure, V₁ is the initial volume, P₂ is the final pressure, and V₂ is the final volume.

We can rearrange this equation to solve for P₂, which gives us P₂ = (P₁V₁) / V₂. We know the initial pressure (which is essentially zero since the container was evacuated), and we can calculate the initial volume (which is given). We also know the final volume, which allows us to calculate the final pressure.

Plugging in the values, we get P₂ = (0.201 mol * 0.08206 L atm/(mol K) * 283.45 K) / 0.0703 L * 5.995 = 0.032 atm.

Therefore, the final pressure of the argon gas is 0.032 atm.

The final pressure of the argon gas is much lower than the initial pressure due to the isothermal expansion.

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Correct Question:

If 0.201 mol of argon gas is admitted to an evacuated 40.3 cm container at 20.3 ∘C. The gas then undergoes an isothermal expansion to a volume of 213 cm then what is the final pressure?

Answer:

Explanation:

The mass of the object can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{100}{5} = 20 \\ \)

We have the final answer as

Hope this helps you

A dam is a structure that is erected across a river or another body of water to produce a reservoir or water storage area behind it. The primary objective of a dam is to control the flow of water, either to prevent flooding or to guarantee a steady supply of water for uses such as irrigation, the production of hydroelectric power, and other uses.

A dam typically consists of a number of parts that work together to control the flow of water. These elements consist of:.

Spillway: A spillway is a channel or opening in the dam that permits extra water to drain from the reservoir during times of intense rainfall or snowmelt. The dam's spillway was built to keep the reservoir's water level from getting too high and possibly causing it to fail.

Outlet Works: A system of pipes, valves, and gates known as an outlet works enables water to be released from a reservoir for a variety of uses, such as irrigation or the production of hydroelectric power. The water level in the reservoir can also be managed using the outlet works.

An intake tower is a vertical shaft or pipe that is situated inside a reservoir and allows water to be drawn out for a variety of uses, including the production of hydroelectric power.

Control Gates: To control the flow of water through the dam, control gates are gates positioned at different points throughout the structure.

Water is kept behind the dam when the reservoir's water level rises. The intake tower or outlet works release water when the water level drops. The control gates can be opened or closed to manage the water level in the reservoir and the flow of water through the dam.

In general, a dam is a crucial piece of infrastructure that aids in controlling water flow, preventing floods, and providing a consistent supply of water for various human endeavors.

Answer:

So if you are buying, Inorganic is cheaper but at the cost of it's quality, organic fertilizer is better quality that's why it is more expensive, both work so if you want the cheaper option that's fine it still works

Explanation:

Answer

Calculating the mass number for an atom requires that we know the atomic number and the number of protons in the atom’s nucleus. The mass number then gives us the average weight of atoms of a given element. However, as long as the number of protons equals the number of neutrons, the values balance out and we always obtain a whole number for the mass number.

Explanation:

those 3

If you look at the molar mass of sodium on the periodic table, it is 22.99 grams/mole. If you look at the molar mass of chlorine on the periodic table, it is 35.45 grams/mole.

To find the molar mass of sodium chloride, we add these two values and that gets us 58.44 grams/mole.

Alright, so we know that 1 mole of NaCl is equal to 58.44 grams, so how many moles would 23.5 grams of NaCl be?

Now we just divide 23.5/58.44 and you get 0.40 moles of NaCl. (If you're confused on what value to put in the numerator, always put the value that you're interested in converting or calculating for.)

Answer: 0.40 moles