Rutherford used a beam of alpha particles for his scattering experiment what is the de Broglie wavelength of an alpha particle moving at a velocity of 2.15×10^7 m per second

Answer:

Hydroxide concentration of the sample is 1.3x10⁻⁶M

Explanation:

The equilibrium constant of water, Kw, is:

H₂O(l) ⇄ H⁺(aq) + OH⁻(aq)

Kw is defined as:

Kw = 1.7x10⁻¹² = [H⁺] [OH⁻]

As the sample is of pure water, both H⁺ and OH⁻ ions have the same concentration because come from the same equilibrium, that is:

[H⁺] = [OH⁻]

We can write the Kw expression:

1.7x10⁻¹² = [OH⁻] [OH⁻]

1.7x10⁻¹² = [OH⁻]²

1.3x10⁻⁶M = [OH⁻]

Answer:

0.057 M

Explanation:

Step 1: Given data

Solubility product constant (Ksp) for HgBr₂: 2.8 × 10⁻⁴

Concentration of mercury (II) ion: 0.085 M

Step 2: Write the reaction for the solution of HgBr₂

HgBr₂(s) ⇄ Hg²⁺(aq) + 2 Br⁻

Step 3: Calculate the bromide concentration needed for a precipitate to occur

The Ksp is:

Ksp = 2.8 × 10⁻⁴ = [Hg²⁺] × [Br⁻]²

[Br⁻] = √(2.8 × 10⁻⁴/0.085) = 0.057 M

Answer:The colour and distribution of the organism's biochromes

Explanation:

The colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism

Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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Answer: The gas generated by two antacid tablets has a smaller volume.

Explanation:

Since the antiacid is the limiting reagent, we know that the more tablets there are, the more gas there will be.

This means that there will be more gas generated by the four antiacid tablets when compared to the two antiacid tablets, which gives us that the gas generated by the two antiacid tablets has a smaller volume.

Answer:

true

Explanation:

heat will destroy the salt components quicker

In the J = 0 state, the BrF molecule does not undergo any revolutions per second. In the J = 1 state, it undergoes approximately 0.498 revolutions per second, and in the J = 10 state, it undergoes approximately 15.71 revolutions per second.

To calculate the rotational constant B, we can use the formula:

B = 1 / (2 * π * Δν)

Where:

B = rotational constant

Δν = spacing between consecutive lines in the rotational spectrum

Given that the spacing between consecutive lines is 0.71433 cm^(-1), we can substitute this value into the formula:

B = 1 / (2 * π * 0.71433 cm^(-1))

B ≈ 0.079 cm^(-1)

The moment of inertia (I) of the molecule can be calculated using the formula:

I = h / (8 * π^2 * B)

Where:

h = Planck's constant

Given that the value of Planck's constant (h) is approximately 6.626 x 10^(-34) J·s, we can substitute the values into the formula:

I = (6.626 x 10^(-34) J·s) / (8 * π^2 * 0.079 cm^(-1))

I ≈ 2.11 x 10^(-46) kg·m^2

The bond length (r) of the molecule can be determined using the formula:

r = sqrt((h / (4 * π^2 * μ * B)) - r_e^2)

Where:

μ = reduced mass of the molecule

r_e = equilibrium bond length

To calculate the wavenumber (ν) of the J = 9+ to J = 10 transition, we can use the formula:

ν = 2 * B * (J + 1)

Substituting J = 9 into the formula, we get:

ν = 2 * 0.079 cm^(-1) * (9 + 1)

ν ≈ 1.58 cm^(-1)

To determine the most intense spectral line at room temperature (300 K), we can use the Boltzmann distribution law. The intensity (I) of a spectral line is proportional to the population of the corresponding rotational level:

I ∝ exp(-E / (k * T))

Where:

E = energy difference between the levels

k = Boltzmann constant

T = temperature in Kelvin

At room temperature (300 K), the population distribution decreases rapidly with increasing energy difference. Therefore, the transition with the lowest energy difference will have the most intense spectral line. In this case, the transition from J = 0 to J = 1 will have the most intense spectral line.

To calculate the number of revolutions per second, we can use the formula:

ω = 2 * π * B * J

Where:

ω = angular frequency (in radians per second)

J = rotational quantum number

For J = 0:

ω = 2 * π * 0.079 cm^(-1) * 0 = 0 rad/s

For J = 1:

ω = 2 * π * 0.079 cm^(-1) * 1 ≈ 0.498 rad/s

For J = 10:

ω = 2 * π * 0.079 cm^(-1) * 10 ≈ 15.71 rad/s

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(a) Because acid is caustic, dolphins can perish from exposure to it. Acids are compounds that give other things protons (H+). Acid can react with the proteins and lipids in dolphins' skin when they come into touch with it, leading to chemical burns and damage to the underlying tissue. Systemic consequences from this include death.

(b) Because chlorine is a potent oxidizer, it interacts with red-hot iron powder to produce Iron(III) chloride (FeCl3) rather than Iron(II) chloride (FeCl2). FeCl3 is created when chlorine at high temperatures rapidly accepts electrons from iron atoms. Contrarily, iron interacts with HCl, a less potent oxidizer than chlorine, to produce FeCl2.

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The density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams is 3.4 g/cm³ (1st option)

First, we shall obtain the volume of the metal. Details below:

Volume = L³

Volume = 5.08³

Volume = 131.1 cm³

Finally, we shall obtain the density of the metal. Details below:

Density = mass / volume

Density of metal = 444.5 / 131.1

Density of metal = 3.4 g/cm³

Thus, we can conclude from the above calculation that the density of the metal is 3.4 g/cm³ (1st option)

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Complete question:

What is the density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams?

3.4 g/cm³

8.89 g/cm³

55.56 g/cm³

0.180 g/cm³

The van't Hoff factor for C5H4 is 1.

The van't Hoff factor, denoted as i, represents the number of particles that a solute dissociates into when it dissolves in a solvent. In the case of C5H4, which is a neutral compound, it does not dissociate or ionize when it dissolves in a solvent.

Therefore, the van't Hoff factor for C5H4 is 1, indicating that it remains as a single particle in the solvent.

When a solute dissolves in a solvent, it can sometimes dissociate into multiple particles, such as ions or molecules.

This leads to an increase in the total number of particles in the solution, affecting various properties like colligative properties (e.g., boiling point elevation, freezing point depression).

However, C5H4 does not exhibit this behavior and does not break apart into ions or molecules upon dissolution. Hence, the van't Hoff factor for C5H4 is 1, implying that it does not affect the colligative properties of the solution since it remains as a single particle.

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Answer:

Part 1)  85.3 grams NaCl

Part 2)  8.79 x 10²³ formula units NaCl

Explanation:

(Part 1)

To find the mass of NaCl, you need to multiply the given value (1.46 moles) by the molar mass of NaCl. This measurement is the atomic masses of the elements times each of their quantities combined. In this case, there is only one mole of each element in the molecule. Moles should be located in the denominator of the conversion to allow for the cancellation of units. The final answer should have 3 sig figs to reflect the given value.

Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl): 58.44 g/mol

1.46 moles NaCl            58.44 g
---------------------------  x  ----------------  =  85.3 grams NaCl
                                        1 mole

(Part 2)

I do not know which other question the second part is referring to, so I will just use the moles given in the first part. To find the formula units, you need to multiply the given value (1.46 moles NaCl) by Avogadro's Number. This conversion represents the number of formula units found in 1 mole of the sample. The moles should be in the denominator of the conversion to allow for the cancellation of units.

Avogadro's Number:

1 mole = 6.022 x 10²³ formula units

1.46 moles NaCl         6.022 x 10²³ units
------------------------  x  -----------------------------  =  8.79 x 10²³ formula units NaCl
                                          1 mole

Answer:

it would be option C

Explanation:

Speed of light = 3×10^8m/s

Planck's constant = 6.626×10^-34 Js

Wavelength = 8 x 10^-9 m

Energy = [(3×10^8) * (6.626×10^-34)] / 8 x 10^-9

Energy = [19.878×10^(8-34)] / 8 x 10^-9

Energy = 2.48475 × 10^(-26+9)

Energy = 2.48×10^-17 J

Answer:

mole of sodium

Explanation:

The composition is three number of atoms in each sample.

The number of samples that was given include the following:

Water (H2O) : This sample is made up of three number of atoms but contains only two elements of oxygen and hydrogen in a ratio of 1:2 respectively.

Carbondioxide (CO2) : This sample is made up of three number of atoms but contains only two elements of carbon and oxygen in a ratio of 1:2.

Sugar (CHO) : This sample is made up of three number of atoms but contains three elements of carbon, oxygen and hydrogen in a ratio of 1:1:1.

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Answer:Electrical Conductivity,soluble

Explanation:

Salt is a non-magnetic solid and is soluble in water. Sand is a non-magnetic solid and is insoluble in water.

Electrical Conductivity: Salt is an electrolyte and conducts electricity when dissolved in water or in a molten state. This is because salt dissociates into ions (Na+ and Cl-) that can carry electric current. In contrast, sand is a covalent compound and does not conduct electricity, as it does not dissociate into ions in the same way as salt. Sand is considered an insulator in terms of electrical conductivity.

Answer:

This done such that when a reaction is in equilibrium and disturb by and external force which would prevent its completion its adjust so as to offset that external force and still go on to completion

Answer:

48.4 g

Explanation:

There is no reason to run these solutes at the 20 MWCO because they are both much smaller than the MWCO of the membrane.

The MWCO (molecular weight cut off) is the molecular weight of a solute at which it will be retained by a membrane during a process such as ultrafiltration or dialysis. If a solute has a molecular weight higher than the MWCO of a membrane, it will be retained and not pass through the membrane. If the molecular weight of a solute is lower than the MWCO, it will pass through the membrane.

In this case, glucose has a molecular weight of 180 g/mol (6 carbons x 12 g/mol per carbon + 6 oxygens x 16 g/mol per oxygen) and albumin has a molecular weight of approximately 81,942 g/mol (607 amino acids x 135 g/mol per amino acid). Both of these solutes have molecular weights that are much lower than 20,000 g/mol, which is a typical MWCO for ultrafiltration or dialysis membranes.

They would both easily pass through the membrane and be lost during the process. Instead, a membrane with a much lower MWCO would be needed if we wanted to retain these solutes during a process such as ultrafiltration or dialysis.

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Answer:

Michael Faraday's

Explanation:

Answer:

Biogas units provide a cleaner and safer source of energy, enabling rural families to produce their own electricity, heat, and fertilizer. One advantage of these plants is that they can be used in exactly the place they're needed, thereby averting the need for extensive, costly power landlines.

The buffer can be made using an acid or a base.

We have to know that the term buffer is the generic term that can be generally used to describe any solution that is resistant to changes in acidity and the alkalinity of the solution.

We know that we can be able to make a buffer in two ways;

1) By the use of a weak acid and its salt

2) By the use of weak base and its salt.

In each case, the pH of the solution that has been formed would not be easily changed and this is the job of the buffer.

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Standard state of the given equation will be:

Pb (s) + N2(g) + 3O2(g) --> Pb(NO3)2(s)

A chemical equation is a word used frequently in everyday chemistry. Jean Beguin, a French chemist, developed the first chemical equations in 1615. A chemical equation is simply a written representation of the process that occurs during a chemical reaction using numbers and symbols.

Explain:

Pb (NO3)2(s)

elements:

Pb, N, O

elemental states

Pb (s)   N2(g) , O2(g)

equation

Pb (s) + N2(g) + 3O2(g) --> Pb(NO3)2(s)

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(2)(½^(15/3)) = 0.0625 (5 half-lives) 102.4 grams order

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Answer:

483.27 minutes

Explanation:

using second faradays law of electrolysis

Answer:

Hope it help you

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Explanation:

Potassium chlorate which is an oxidant is mixed with sulfur, starch and glue to make the tip of matchstick. When we need to light up the fire, we rub the matchstick with the surface of matchbox which offers resistance. The friction between the tip and the surface is the main reason of fire.

REAL NAME - SHRESTH DUBEY

Taking into account the definition of molarity, the molar concentration of 5.8501 g NaCl dissolved in 500.00 cm³ volumetric flask is 0.2 mol/L.

Molarity is a measure of concentration that indicates the number of moles of solute that are dissolved in one liter of solution. This is, the molarity indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated according to the following expression:

molarity= number of moles of solute÷ volume

Molarity is expressed in units moles/L.

In this case, you have:

Replacing in the definition of molarity:

molarity= 0.1 moles÷ 0.5 L

Solving:

molarity= 0.2 mol/L

Finally, the molar concentration is 0.2 mol/L.

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1) If the temperature of the system increases, the equilibrium constant k decreases.

2) the concentration of H₂ increases.

The reaction is given as :

CO +  2H₂   ⇄  CH₃OH                          ΔH = -91.8 KJ ( exothermic reaction)

1) Temperature is the only factor that changes the equilibrium constant for the given reaction. As temperature increases equilibrium constant decreases because the reaction is exothermic reaction.

                K = [ CH₃OH ] / [CO] [H₂]²

2) If the temperature increases the position of equilibrium moves to the left and concentration of H₂ increases.

Thus, 1) If the temperature of the system increases, the equilibrium constant k decreases.

2) the concentration of H₂ increases.

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