Calculate the percent composition of all of the potassium (K) in K2SO3

Answer:

its the seeds since its what is being tested

The dependent variable of this experiment is the height of the seedling.

A variable can be described as an alphabet that is employed in an experiment to represent an unknown number. Variable represents the value. A variable can be demonstrated as a quantity that may be changed according to the mathematical problem.

The dependent variable in an experiment can be demonstrated as a variable that depends on the value of some other number. The dependent variable in an experiment can be demonstrated as the output of a function. If the value of the dependent variable during the experiment changes then there will be a change in the value of the independent variable.

The independent variable does not depend on the other variables as well as is called the input of a function. The value of the independent variable is generally not affected by any values of a variable.

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Answer:

A scale shows colors from red to purple with labels from the red end of 0, 1 gastric acid, 2 lemon juice, 3 orange juice, 4 tomato juice, 5 black coffee, 6 urine, 7 distilled water, 8 sea water, 9 baking soda, 10 milk of magnesia, 11 ammonia, 12 soapy water, 13 bleach, 14.

Familiar solutions can have a wide range of pH levels.

According to the chart, which is the strongest acid, based on its pH level?

✔ gastric acid

Lemon juice has approximately how many more times the H+ ions than tomato juice?

✔ one hundred times

Which has the highest concentration of H+ ions: baking soda, ammonia, or bleach?

✔ baking soda

Explanation:

The strongest acid based on pH level is gastric acid. Lemon juice has 10 more times H⁺ ions than tomato juice.

The highest concentration of H⁺ ions is in baking soda.

pH value can be explained as the negative logarithm of hydrogen ion (H⁺) ions concentration in the solution. The pH is mathematically inversely proportional to the number of H⁺ ions.

pH = - log ([H⁺])

In chemistry, the acidity or basicity of an aqueous solution can be determined from the pH value. Acidic solutions generally have lower pH values while basic or alkaline solutions have high pH values.

The pH scale ranges from pH values 0 to 14 while a pH equal to 7.0 is neutral. A low pH value of about 1 or 2 is acidic and a high pH (of 12 or 14) is basic.

Baking soda has a low pH value among baking soda, ammonia, or bleach so it will have the highest concentration of H⁺ ions.

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Fossil fuels are essential part of the power generation in the world. They are easily combustible and more reliable and cheaper. However, the burning of fossil fuels releases toxic gases  to the environment.

Fossil fuels are fuel generated from the decomposition materials. Petroleum, coal, natural gas  etc. are fossil fuels which are excavating from the earth.

Fossil fuels are non-renewable sources of energy. Hence, as the existing fossil sources are exhausted no more fossil fuel can be made. It is cheaper, reliable and easy to use.

However, the toxic hydrocarbon gases released from the burning of fossil fuels make the environment polluted. Therefore, overuse of fossil fuel definitely rise the atmospheric pollution.

Its use over the next 50 years, will increase the global warming and more of it will be exhausted.

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Answer:

1

Explanation:

To determine the value of K (equilibrium constant) at 25 °C, we can use the Nernst equation, which relates the cell potential (E) to the equilibrium constant (K) and the standard cell potential (EºCell). The Nernst equation is given by:

E = EºCell - (RT / nF) * ln(K)

Where:

E = cell potential

EºCell = standard cell potential

R = gas constant (8.314 J/(mol·K))

T = temperature in Kelvin (25 °C = 298 K)

n = number of electrons transferred in the balanced redox equation

F = Faraday's constant (96,485 C/mol)

ln = natural logarithm

In this case, the given standard cell potential (EºCell) is -0.37 V.

The balanced redox equation for the cell reaction is:

Pt + Cr²+ -> Pt + Cr³+

Since there is no change in the oxidation state of Pt, no electrons are transferred in the reaction (n = 0).

Substituting the known values into the Nernst equation, we have:

E = -0.37 V - (8.314 J/(mol·K) * 298 K / (0 * 96,485 C/mol)) * ln(K)

E = -0.37 V

Since n = 0, the term (RT / nF) * ln(K) becomes 0, and we are left with:

-0.37 V = -0.37 V - 0

This implies that the value of K is 1, since any number raised to the power of 0 is equal to 1.

Therefore, the value of K at 25 °C for the given cell is 1.

Given that,

Mass number of Ge = 70

Then,

Atomic number of Ge = 32

No. of protons = 32

No. of electrons = 32

No. of neutrons,

→ 70 - 32 = 30

Answer:

30 is correct

Explanation:

70 - 32 = 30 mark as brainliest

The order of the graphs that shows the movement of the object is; B  C E A D.

We know that energy has to do with the ability to do work. In this case, we can see that the object has been dropped from a height and we must have in mind the principle of the conservation of mechanical energy. In this principle, it has been stated that energy can neither be created nor destroyed but can be converted from one form to another.

As the object is falling, there are three main kinds of energy that would come into play and these are; mechanical energy, kinetic energy and potential energy.

The kinetic energy is the energy that is in motion while the kinetic energy has to do with the energy that is at a point. Looking at the graph, we know that the amount of the thermal energy would increase the farther the object falls to the ground. Let the letters be shown as A B C D E standing for each of the graphs.

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The pH of a 0.0100 M sodium benzoate solution is determined as 8.09.

The pH of a solution is a measure of hydrogen (H+) ion concentration, which is, in turn, a measure of acidity of the solution.

pH is can also be determined from pOH of the solution as shown below;

pH = 14 - pOH

let the hydroxyl concentration, OH = x

x²/M = kb

x²/0.01 = 1.5 x 10⁻¹⁰

x² = 1.5 x 10⁻¹²

x = √(1.5 x 10⁻¹²)

x = 1.2247 x 10⁻⁶

pOH = - log(OH⁻)

pOH = -log( 1.2247 x 10⁻⁶)

pOH = 5.91

pH = 14 - 5.91

pH = 8.09

Thus, the pH of a 0.0100 M sodium benzoate solution is determined as 8.09.

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Answer:

47.42 amu.

Explanation:

The following data were obtained from the question:

Isotope A (Bl–47)

Mass number = 46.91 amu

Abundance = 53.4%

Isotope B (Bl–48):

Mass number = 47.98 amu

Abundance = 46%

Isotope C (Bl–50)

Mass number = 50.12 amu

Abundance = 100 – (53.4 + 46)

Abundance = 100 – 99.4

Abundance = 0.6%

Average atomic mass of Blairium =?

The average atomic mass can be obtained as follow:

Average atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100] + [(mass of C × C%)/100]

Average atomic mass = [(46.91 × 53.4)/100] + [(47.98 × 46)/100] + [(50.12 × 0.6)/100]

Average atomic mass = 25.05 + 22.07 + 0.3

Average atomic mass = 47.42

Therefore, the average atomic mass of blairium is 47.42 amu.

The change in the internal energy of the gas in the cylinder is 763 J

From the first law of thermodynamics, the change in internal energy(U) of a system is equivalent to the difference between net heat transfer(Q) into the system and the net work done(W) on the system

The equation for the change in the internal energy from the first law of thermodynamics is:

ΔU = ΔQ - ΔW

ΔU = 875 J - 112 J

ΔU = 763 J

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The amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C is approximately 1.183 kJ.

To calculate the amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C, we need to consider the heat required for temperature change and the heat of vaporization.

First, let's calculate the heat required for the temperature change from 30.0 °C to the boiling point of 47.6 °C in the liquid state:

q1 = mass * specific heat * temperature change

= 5.6 g * 0.91 J/g-K * (47.6 °C - 30.0 °C)

= 81.23 J

Next, let's calculate the heat required for the phase change from liquid to gas:

q2 = heat of vaporization * number of moles

= 27.5 kJ/mol * (5.6 g / molar mass)

= 27.5 kJ/mol * (5.6 g / 146.39 g/mol)

= 1.051 kJ

Finally, let's calculate the heat required for the temperature change from the boiling point to 60.5 °C in the gas state:

q3 = mass * specific heat * temperature change

= 5.6 g * 0.67 J/g-K * (60.5 °C - 47.6 °C)

= 51.02 J

The total amount of heat required is the sum of q1, q2, and q3:

q_total = q1 + q2 + q3

= 81.23 J + 1.051 kJ + 51.02 J

= 1.132 kJ + 51.02 J

= 1.183 kJ

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Answer:

Q = 202.05 J

Explanation:

Given data:

Mass of iron = 75 g

Initial temperature = 295 K

Final temperature = 301 K

Specific heat capacity of iron = 0.449 J/g.K

Heat required = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT  = 301 K - 295 K

ΔT  = 6K

Q = 75 g ×0.449 J/g.K × 6K

Q = 202.05 J

In 375 grammes of the metal Jurupium, there are 3 moles of the element.

On 1 November 1952, the first thermonuclear explosion, which occurred on a Pacific atoll, left behind debris that contained the element Einsteinium. A neighbouring atoll's fallout material was shipped to Berkeley, California, for analysis. It belongs to the group of elements with atomic number 63 that are numerically squeezed between barium and hafnium. A lanthanide, or europium, is one of those mysterious elements outside the periodic table's core.

Divide the mass of Jurupium by its molar mass to see how many moles there are in 375 grammes of Jurupium metal:

375 g / 125 g/mol = 3 moles

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1) We have to write the Lewis structure of the molecule.

Balanced equation :

3H₂+N₂⇒2NH₃

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Unbalanced⇒the number of atoms from both sides (reactants and products) is not the same

H₂+N₂⇒NH₃

H=2(left), H=3(right)

N=2(left), N=1(right)

Balanced ⇒ the number of atoms from both sides (reactants and products) is equal

3H₂+N₂⇒2NH₃

H=3x2=6(left), H=2x3=6(right)

N=2(left), N=2x1=2(right)

Answer:

The chemical formula of barium phosphate is Ba3(PO4)2.

Explanation:

brainlest ples :(

The pH of the solution is 10.82.

To solve this problem, we need to determine the concentration of the hydronium ion (\(H_3O^+\)) in the solution. This can be done using the following steps:

Write the balanced chemical equation for the reaction between HBr and CH₃NH₂.

HBr + CH₃NH₂ → CH₃NH₃⁺ + Br⁻

Write the expression for the base dissociation constant (Kb) for CH₃NH₂.

Kb = [CH₃NH₃⁺][OH⁻]/[CH₃NH₂]

Calculate the concentration of hydroxide ions (OH⁻) in the solution using the Kb value and the concentration of CH₃NH₂.

Kb = [CH₃NH₃⁺][OH⁻]/[CH₃NH₂]

4.4 × 10⁻⁴ = x² / (0.400 M)

x = 6.63 × 10⁻³ M

[OH⁻] = 6.63 × 10⁻³ M

Calculate the concentration of \(H_3O^+\) using the equilibrium constant for the reaction between HBr and \(H_2O\).

\(HBr + H_2O = H_3O^+ + Br^-\)

\(Kw = [H_3O^+][OH^-] = 1.0 * 10^{-14}\\[H_3O^+] = Kw/[OH-] = 1.51 * 10^{-11}\)

Calculate the pH using the concentration of \(H_3O^+\).

\(pH = -log[H_3O^+]\\pH = -log(1.51 * 10^{-11})\)

pH = 10.82

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You start with 285mL of 0.35M solution of NaCl. Sufficient amount of water is added so that the volume increases to 550mL. What will be concentration of the new solution.

Initial volume = V₁ = 285 mL

Initial concentration = M₁ = 0.35 M

Final volume = V₂ = 550 mL

Final concentation = M₂ = ?

We are only adding water to our solution, so we are diluting the solution. The number of moles of NaCl will remain constant. Since the amount of the solute is constant, in dilution exercises we can use this formula:

V₁ * M₁ = V₂ * M₂

If we solve it for the final concentration we get:

M₂ = V₁ * M₁ / V₂

If we replace by the given values we obtain:

M₂ = 285 mL * 0.35 M / 550 mL

M₂= 0.18 M

Answer:

4 millllllermeeters jb

The pressure of 8.06 L of an ideal gas in a flexible container is decreased to one-third of its original pressure, and its absolute temperature is decreased by one-half and the final volume of gas is 12.09 L

The volume of gas in a flexible container is 8.06 L

The pressure is P1=X atm

Temperature is T1=YK

Let us calculate the volume V2 if Pressure P2=X/3 atm

Temperature T2=Y/2 K

Using the ideal gas equation, we get

P1V1/T1=P2V2/T2

V2=V1P1T2/T1P2

V2=8.06LX atm×Y/2K/YK.X/3 atm

V2=8.06x3/2

V2=12.09 L

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The valency of Carbon Dioxide is 4.

Answer:

1.82 x 10^-12 m.

Explanation:

The de Broglie wavelength of an electron traveling at 1.02 x 10^5 m/s is 1.82 x 10^-12 m.

The de Broglie wavelength of a particle is a measure of the particle's wave-like behavior, and it is given by the following equation:

λ = h / mv

where λ is the de Broglie wavelength, h is the Planck constant, m is the mass of the particle, and v is the velocity of the particle.

In the case of an electron traveling at 1.02 x 10^5 m/s, the de Broglie wavelength is given by the following calculation:

λ = 6.62 x 10^-34 J * s / (9.11 x 10^-31 kg * 1.02 x 10^5 m/s)

This simplifies to:

λ = 1.82 x 10^-12 m

Therefore, the de Broglie wavelength of an electron traveling at 1.02 x 10^5 m/s is 1.82 x 10^-12 m.

Number of molecules in 1 dm³ Oxygen = 2.71 x 10²²

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

1 dm³ of oxygen = 1 L Oxygen

\(\tt \dfrac{1}{22.4}=0.045`mol\)

n=mol=0.045

No = 6.02.10²³

\(\tt N=n\times No\\\\N=0.045\times 6.02\times 10^{23}\\\\N=2.71\times 10^{22}\)

Answer: Absorption and insolation

Explanation:

Answer:

what the person above said

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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Butyryl chloride reacts with Grignard reagent, methyl magnesium bromide, to form pentan-2-one. Pentan-2-one reacts with vinyl magnesium bromide to form the final product 3-methylhex-1-en-3-ol.

The following diagram illustrates how butyryl chloride becomes 3-methylhex-1-en-3-ol. conversion of 3-methylhex-1-en-3-ol from butyryl chloride. Tertiary alcohols are produced when carboxylic esters, R'CO2R, combine with two equivalents of an organolithium or Grignard reagent. Two identical alkyl groups are present in the tertiary alcohol (see R) A ketone intermediate is used to carry out the reaction, which is subsequently used to react with the second equivalent of the organometallic reagent. As we've just seen, the ketone undergoes further reactions to create a tertiary alcohol. This explains why, when reacting with esters, two equivalents of Grignard are required. a mechanism The Grignard performs an addition reaction on the ester in the first step, resulting in the formation of C-C and the breakdown of C-O (pi), giving us an intermediate with a negatively charged oxygen.

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Answer:  Newton's first law is often called the law of inertia

Explanation:

To solve this problem, we need to consider the energy required to warm the ice cube from -18.5°C to 0°C, the energy required to melt the ice cube, and the energy required to warm the melted water from 0°C to 55°C. Let's calculate the energy for each step and determine the number of ice cubes needed.

Warming the ice cube to 0°C:

The specific heat capacity of ice is 2.05 J/g°C. The temperature change is from -18.5°C to 0°C. Therefore, the energy required to warm the ice cube can be calculated as:

Energy = mass × specific heat capacity × temperature change

Energy = 24 g × 2.05 J/g°C × (0°C - (-18.5°C))

Energy = 24 g × 2.05 J/g°C × 18.5°C = 899.4 J

Melting the ice cube:

The heat of fusion (specific latent heat of fusion) of water is 334 J/g. We need to determine the energy required to melt the ice cube. The mass of the ice cube is 24 g, so the energy required can be calculated as:

Energy = mass × heat of fusion

Energy = 24 g × 334 J/g = 8016 J

Warming the melted water from 0°C to 55°C:

The specific heat capacity of water is 4.184 J/g°C. We need to determine the energy required to warm the melted water from 0°C to 55°C. The mass of the melted water can be calculated by subtracting the mass of the ice cube that melted from the initial mass of the ice cube (24 g).

Mass of melted water = 24 g - 24 g = 0 g (since all the ice melted)

Therefore, no additional energy is required for this step.

Now, let's add up the energy required for each step to determine the total energy needed to cool the coffee from 85°C to 55°C:

Total energy required = Energy to warm the ice cube to 0°C + Energy to melt the ice cube

Total energy required = 899.4 J + 8016 J = 8915.4 J

Given that each ice cube provides 8915.4 J of energy, we can determine the number of ice cubes needed to cool the coffee.

Energy per ice cube = 8915.4 J

Energy required to cool the coffee = Total energy required = 8915.4 J

The number of ice cubes needed = Energy required to cool the coffee / Energy per ice cube

Number of ice cubes needed = 8915.4 J / 8915.4 J = 1

Therefore, you would need to add 1 ice cube to your 355 mL cup of coffee to bring it to 55°C.

The correct answer is A. 1.