what is the oxidation state of manganese in kmno4? input the answer with the proper sign ( or -), followed by the roman numeral.

a. The molar solubility of barium fluoride (BaF2) in pure water can be calculated using the solubility product constant (Ksp) for BaF2. The balanced equation for the dissolution of BaF2 is:

BaF2 (s) ⇌ Ba2+ (aq) + 2F- (aq)

The Ksp expression for this equilibrium is:

Ksp = [Ba2+][F-]^2

Given that the Ksp of BaF2 is 1.7 x 10^-6, we can assume that the concentration of Ba2+ ions and F- ions in pure water at equilibrium is "x" (assuming all the BaF2 dissolves).

Ksp = (x)(2x)^2 = 1.7 x 10^-6

4x^3 = 1.7 x 10^-6

x^3 = 4.25 x 10^-7

x = (4.25 x 10^-7)^(1/3)

x ≈ 0.007 M

Therefore, the molar solubility of BaF2 in pure water is approximately 0.007 M.

The molar solubility of barium fluoride (BaF2) in pure water is approximately 0.007 M, based on the solubility product constant (Ksp) for BaF2.

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The diffusion coefficients for the interdiffusion of carbon in both (a) α-iron (BCC) and (b) γ-iron (FCC) are \(3.9379 * 10^{-13} m^2/s\) and \(6.37 * 10^{-14} m^2/s.\)

Given the temperature of  Î³-iron (FCC) = 925°C = 273 + 925 = 1198K

The D0 for the interdiffusion of carbon in α-iron =  \(1.1 * 10^{-6}m^2/s\)

The D0 for the interdiffusion of carbon in γ-iron = \(2.3 * 10^{-5}m^2/s\)

The values of Qd of  Î±-iron = 80 kJ/mol while that of  Î³-iron = 148kJ/mol

Let the diffusion coefficient of carbon in α-iron = D1

We know that it is calculated as: D = D0 * exp(-Qd/RT) such that:

Here R is the gas constant = 8.3145 J/mol/K

D1 =  \(1.1 * 10^{-6}m^2/s * exp(-80 kJ/mol / (8.3145 J/mol/K * 1198 K))\)

D1 = \(3.9379 * 10^{-13} m^2/s\)

(b.) Let the diffusion coefficient of carbon in  Î³-iron (FCC) is = D2

Similarly calculate D2 as:  D2 = D0 * exp(-Qd/RT)

D2 = \(2.3 * 10^{-5} m^2/s * exp(-148 kJ/mol / (8.3145 J/mol/K * 1198K))\)

D2 = \(6.37 * 10^{-14} m^2/s\)

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The percent composition of the sample containing 1.29 grams of carbon and 1.71 grams of oxygen is 43% carbon and 57% oxygen.

The percent composition of a sample can be calculated by dividing the mass of each element in the sample by the total mass of the sample and then multiplying by 100%.

To find the percent composition of a sample containing 1.29 grams of carbon and 1.71 grams of oxygen, we need to calculate the total mass of the sample first.

Total mass of the sample = mass of carbon + mass of oxygen
= 1.29 grams + 1.71 grams
= 3 grams

Now, we can calculate the percent composition of carbon and oxygen in the sample:

Percent composition of oxygen = (mass of oxygen / total mass of the sample) x 100%
= (1.71 grams / 3 grams) x 100%
= 57%

Percent composition of carbon =  (mass of carbon / total mass of the sample) x 100%

=(1.29 grams / 3 grams) x 100%

= 43%

Therefore, the sample contains 43% carbon and 57% oxygen by mass.

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Answer:

0.40m

Explanation:

Answer: Based on the given graph, the concentration of D over time decreases faster than E increases. Therefore, the correct option is C.

Explanation:

The concentration of D decreases faster than E increases. The graph represents the reaction between D and E, which is shown as DE. As time goes on, the concentration of D decreases while the concentration of E increases. This indicates that D is being consumed in the reaction while E is being produced. However, it can be seen from the graph that the decrease in the concentration of D is steeper than the increase in the concentration of E.

Therefore, option C is correct.

Answer:

B. decreases

Explanation:

The solubility of gases in a liquid is inversely proportional to the temperature, it means that if you increase the temperature, the solubility decreases.

When a water molecule is split, part of it is which used to make fuels is : a.) the electrons and protons from the hydrogen.

The water molecules break down into hydrogen and oxygen at the atomic level during thermolysis. For instance, around 3% of all H2O dissociates into different combinations of hydrogen and oxygen atoms at 2200 °C, primarily into H, H2, O, O2, and OH.

Water splitting is the chemical reaction where water is broken down into oxygen and hydrogen: 2 H2O → 2 H2 + O2

Efficient and economical water splitting could be a technological breakthrough that could underpin hydrogen economy, based on green hydrogen. A version of water splitting occurs in photosynthesis also but hydrogen is not produced.

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Answer:

the ans is in the picture with the steps  

(hope it helps can i plz have brainlist :D hehe)

Explanation:

The concept Boyles law is used here to determine the final pressure of the gas. Boyle's law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. The final pressure of the gas is  7.66 atm.

At constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. It can also be explained as at constant temperature, the product of pressure and volume of a given mass of gas is constant.

A straight line graph is obtained when pressure is plotted against the inverse of the volume.

Mathematically the law can be expressed as:

V∝ 1/P

PV = k (Constant)

Here 'V' is the volume and 'P' is the pressure of the gas.

For two different gases, the equation is given as:

P₁V₁ = P₂V₂

P₂ = P₁V₁ / V₂

1 torr = 0.00131 atm

P₁ = 0.023 atm

0.023 × 50.00  / 0.1500 = 7.66 atm

Thus the final pressure is 7.66 atm.

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The isotope with 17 protons and 18 neutrons is chlorine-35 (17 protons + 18 neutrons = mass number of 35). Its atomic symbol is ^35Cl.

The isotope with an atomic number of 18 (which means it has 18 protons) and 20 neutrons is argon-38 (18 protons + 20 neutrons = mass number of 38). Its atomic symbol is ^38Ar. Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. The number of neutrons in an isotope can affect its stability, radioactive properties, and physical properties such as melting and boiling points. Isotopes are often represented using the atomic symbol, which indicates the element's symbol, atomic number, and mass number.

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Option B, A catalytic domain of 35 kDa and a SET domain of 35 kDa make up the approximately 70 kDa molecular weight of active Dnmt3a.

The molecular mass of active Dnmt3a is around 70 kDa. The addition of methyl groups to DNA molecules is carried out by the DNA methyltransferase enzyme Dnmt3a. The inhibition of transposable elements is another potential role for it.

A catalytic domain and a SET domain make up Dnmt3a's two separate domains. A molecular weight of approximately 35 kDa distinguishes the SET domain from the catalytic domain. This results in an overall molecular weight for active Dnmt3a of 70 kDa.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

From the question

mass of steel = 156 g

volume = 20 mL

The Density is

\(Density = \frac{156}{20} = \frac{39}{5} \)

We have the final answer as

Hope this helps you

According to the law of conservation of mass,the total number of atoms does not change  and so mass is conserved in the reaction.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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"The Law of Conservation of Mass and Energy ("matter can neither be created nor destroyed") clearly states that a chemical change cannot alter the number of atoms in a given reaction. The atoms can only rearrange so that it can yield a new molecule/compound but the number of atoms should stay the same."

Credit to where I found the information: Socratic Q&A

so the total number of atoms does not change.

Answer:

A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow. In a balanced chemical equation, the numbers of atoms of each element and the total charge are the same on both sides of the equation.

Answer:

chemical equation and chemical reaction

Explanation:

chemical equation is the symbolic representation Of a chemical reaction in the form of symbols

Keeping in view the information provided here, the compound likely contains a carbonyl functional group. The infrared absorption at 1660 cm-1 suggests the presence of a C=O bond, which is characteristic of carbonyl compounds such as ketones, aldehydes, carboxylic acids, esters, or amides. The single band at 3400 cm-1 indicates the presence of an O-H bond, which is commonly found in alcohols or carboxylic acids.

Without further data, it is difficult to determine the specific functional group present in the compound.

Additional analysis, such as NMR spectroscopy or further infrared spectroscopy, would be required for a more precise identification of the compound's functional group.

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Answer: B. 0.36 moles

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 260 mm Hg = 0.342 atm         (760 mm Hg= 1atm)

V = Volume of gas = 31.0 L

n = number of moles = ?

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(87^0C=(87+273)K=360K\)

\(n=\frac{PV}{RT}\)

\(n=\frac{0.342atm\times 31.0L}{0.0821L atm/K mol\times 360K}=0.36moles\)

Thus the moles of gas present are 0.36

Taking into account the reaction stoichiometry, 3.33 moles of ammonia are produced when 5.0 moles of hydrogen react with excess nitrogen.

In first place, the balanced reaction is:

N₂ + 3 H₂ → 2 NH₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 3 moles of hydrogen form 2 moles of ammonia, 5 moles of hydrogen form how many moles of ammonia?

\(moles of ammonia=\frac{5 moles of hydrogenx 2 moles of ammonia}{3 moles of hydrogen}\)

moles of ammonia= 3.33 moles

Finally, 3.33 moles of ammonia are produced when 5.0 moles of hydrogen react with excess nitrogen.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

where

m is the mass

v is the velocity

From the question

m = 1.6 kg

v = 25 m/s

We have

\(k = \frac{1}{2} \times 1.6 \times {25}^{2} \\ = 0.8 \times 625 \\ = 500\)

We have the final answer as

Hope this helps you

According to combined gas law:

\(P_{1}V_{1}/T_{1}=P_{2}V_{2}/T_{2}\)

So, given \(P_{1}=95kpa,V_{1}=4l,P_{2}=101kpa,V_{2}=6l,T_{2}=471k\)

After substituting values in the formula,

\(95*4/T_{1}=101*6/471\)

\(T_{1}=295k\)

What is the Combined Gas Law?

        PVT=k (k being the proportionality constant)

Thus, the original temperature is 295k.

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109.5

when we see it in 3d dimension...the repulsion force of the bonding pairs maximaze the distance from each other, thus making the angle 109.5

Answer:

molar mass of zn( no3) 2

is 189.36 g/ mol

Answer:

4 elements

C carbon

H hydrogen

Na sodium

O oxygen

Explanation:

Answer:

\(\boxed {\boxed {\sf About \ 1.94 *10^{-8} \ mol \ H_2S}}\)

Explanation:

To convert from molecules to moles, Avogadro's Number must be used.

This number tells us how many particles (atoms, ions, molecules, etc.) are in 1 mole of a substance. For this problem, it is moles of hydrogen sulfide.

We can use the number as a fraction.

\(\frac { 6.022 *10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S}\)

Multiply by the given number of molecules.

\(1.17*10^{16} \ molecules \ H_2S *\frac { 6.022 *10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S}\)

Flip the fraction so the molecules of hydrogen sulfide will cancel out.

\(1.17*10^{16} \ molecules \ H_2S *\frac {1 \ mol \ H_2S }{ 6.022 *10^{23} \ molecules \ H_2S}\)

\(1.17*10^{16} *\frac {1 \ mol \ H_2S }{ 6.022 *10^{23} }\)

\(\frac {1.17*10^{16} \ mol \ H_2S }{ 6.022 *10^{23} }\)

\(1.94287612*10^{-8} \ mol \ H_2S\)

The original measurement of molecules had 3 significant figures so we must round our answer to that.

For the number we calculated, that is the hundredth place. The 2 in the thousandth place tells us to leave the 4 in the hundredth place.

\(1.94 *10^{-8} \ mol \ H_2S\)

There are about 1.94*10⁻⁸ molecules of hydrogen sulfide.

Answer: In ionic bonding (a noble gas configuration is formed for each element or ion).

Explanation:

IONIC bonding, which is also called electrovalent bonding involves the complete transfer of electrons from one atom to another in order to attain a noble gas electron configuration.

The noble gases or group 0 elements have a completely filled outermost shell of eight electrons. This makes them generally very stable, that is, unreactive. There is a natural drive for other atoms to attain the electron configuration of group 0 (inert gases) elements. This usually results in atoms entering into chemical combinations by losing, gaining or sharing electrons.

Ionia compound such as sodium chloride

--> have high melting points because alot of heat energy is required to break the attractive forces between the ions;

--> are hard and brittle;

--> are soluble in water;

--> conduct electricity when in solution or molten form because the ions are able to move about, that is, they are electrolytes

Answer:

So, plants and their leaves look green because the “special pair” of chlorophyll molecules uses the red end of the visible light spectrum to power reactions inside each cell. The unused green light is reflected from the leaf and we see that light.

Explanation:

in simpler words chlorophyll gives them thier green color

Answer:

Answer: 93.54%Explanation: Divide the mass of the zinc by the total mass of the penny. 2.9/3.1=0.9354To get to a percent, multiply by 100.

Explanation:

93.54% of zinc in the penny when a penny has a total mass of 3.1 grams and zinc makes up 2.9 g of the penny.

What is mass?

Mass is simply the measure of the amount of matter in a body.

Divide the mass of the zinc by the total mass of the penny.

=0.9354

To get to a percent, multiply by 100.

0.9354 x 100 = 93.54

Thus, the mass of the zinc in the penny is 93.54%.

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Answer:

4.2 gigagrams

Explanation:

kilo = 1,000

giga = 1,000,000,000

milli = .001

Answer:

ok here is you answer

Explanation:

Blood is a liquid because it is composed of cells and plasma that are suspended in a liquid state and can easily flow through the circulatory system, delivering oxygen and nutrients to cells and removing waste products.

Calorimetry is a scientific technique used to measure the heat transfer or energy changes associated with chemical reactions or physical processes. It involves the use of a calorimeter, which is a device designed to contain and measure these energy changes. The important components of a calorimeter include a sample chamber where the reaction takes place, a thermometer to measure temperature changes, and an insulating material to minimize heat loss to the surroundings. Terms necessary for calorimetry include heat capacity (the amount of heat required to raise the temperature of the calorimeter), specific heat capacity (the amount of heat required to raise the temperature of a substance), and the principle of conservation of energy.

Answer:

yes, bacteria is alive because it can basically generate energy and including molecules to keep itself alive. There are sone bacteria that can help to digest food, destroy disease-causing cells, also giving the body its needed vitamins.