The reaction of selenious acid with iodide ions in acidic solution occurs according to the following equation: H₂SeO3(aq) + 61- (aq) + 4H+ (aq) → Se (s) + 2 l3 (aq) + 3 H₂O (1) It was found that

Answer:

Li2S

Explanation:

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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The Ksp for\([B_4O_5(OH)_4]_2\)- at 45 °C is 3.42 x \(10^{-13}\).

The solubility of \([B_4O_5(OH)_4]_2\)- in water at 45 °C is given as 0.023 M. We can use this information to calculate the Ksp for \([B_4O_5(OH)_4]_2\) at this temperature.

The dissolution reaction for\([B_4O_5(OH)_4]_2\)- can be written as:

\(B_4O_5(OH)_4\)(s) ↔ \(4B(OH)_4\)-(aq) + 2H+(aq)

he equilibrium expression for this reaction is:

Ksp = \([B(OH)_4-]_4 [H+]_2\)

Assuming the solubility of\([B_4O_5(OH)_4]_2\)- is x M, then the concentration of \([B(OH)_4-]\)and H+ will be 4x and 2x, respectively. Substituting these values in the equilibrium expression, we get:

Ksp = (4x)4 (2x)2 = 128x6

Solubility of \([B_4O_5(OH)_4]_2\)- at 45 °C, we get:

Ksp = 128 (0.023)6 = 3.42 x\(10^{-13}.\)

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--The complete Question is, At 45 °C, the solubility of [B4O5(OH)4]2- in water is found to be 0.023 M. What is the Ksp for [B4O5(OH)4]2- at this temperature? --

It is given that its a combustion reaction, we know that the ending compounds are CO2 and H2O alone.  To get this, we add O2 in a combustion reaction to our initial compound.

C8H18 + O2  --->  CO2 + H2O  ( + trace amounts of C8H18 left)  We are asked about the C8H18 left meaning we have a limiting reactant and it is not completely water and CO2 left due to the limiting reagent.  So we are trying to find the excess reactant.  

To balance the equation we must balance all molecules ;

2 C8H18 + 25 O2  --->  16 CO2  +  18 H2O   (not taking into account the combustion of air)

It is given that it is incomplete combustion so we must use the grams of product to calculate the amount of reactant used due to the limiting reagent

1.15 g H2O * ( 1 mol H2O / 18.01532 g H2O)  *( 2 mol C8H18 / 18 mol H2O) * ( 1 mol C8H18 / 114.24 g C8H18) = 0.00111755 = 0.00118 g C8H18  reacted

11.8 g C8H18 in the initial reaction,  0.0118 g reacted to get 1.15 g H2O

11.8-0.00118 = 11.79882 = 11.8 g C8H18 left in the balanced equation (meaning almost none of it was reacted)

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Answer:

Carbon dioxide is held together by weak intermolecular forces (only London dispersion LD) and is a non-polar molecule. Because of this weak attraction, it exists as a gas. Water on the other hand is polar (dipole forces DP), and has a stronger hydrogen bond existing within it (in addition to LD). This makes it attract itself more than say carbon dioxide molecules, so it commonly exists as a liquid. Finally, salt like water is polar, and has ionic bonds that are even stronger than a hydrogen bond. This makes salt have a great attraction to itself, sticking together as a solid because its molecules cant easily be broken up.

Explanation:

These are the strongest intermolecular forces ranked from strongest to weakest.

1. Network Covalent

2. Ionic

3. Hydrogen Bonding

4. Dipole Dipole

5. London Dispersion

im guessing the Aurora Borealis

The partial pressure of O₂ in the gas mixture of 35% He and 65% O₂, is 520 mmHg.

To find the partial pressure of O₂ in a gas mixture, we'll use the concept of Dalton's Law of Partial Pressures. Here's a step-by-step explanation:

1. Understand the problem: We have a gas mixture containing 35% He and 65% O₂ with a total pressure of 800 mmHg. We need to find the partial pressure of O₂.

2. Use Dalton's Law of Partial Pressures: According to Dalton's Law, the total pressure of a gas mixture is the sum of the partial pressures of its individual gases. Mathematically, it's written as:
P(total) = P(He) + P(O₂)

3. Calculate the partial pressure of O₂: Since we know that O₂ makes up 65% of the gas mixture, we can find the partial pressure of O₂ by multiplying the total pressure by the percentage of O₂:
P(O₂) = P(total) × (percentage of O₂)
P(O₂) = 800 mmHg × 0.65

4. Solve for P(O₂):
P(O₂) = 520 mmHg

So, the partial pressure of O₂ in the gas mixture is 520 mmHg.

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The main overall driving force for any spontaneous reaction or change within a reaction system, not considering the surroundings, is the decrease in Gibbs free energy (ΔG).

Gibbs free energy is a measure of the energy available to do work in a system. Spontaneous reactions are those that occur naturally without the need for external input of energy. In order for a reaction to be spontaneous, the overall change in Gibbs free energy (ΔG) must be negative. This means that the products of the reaction have lower free energy than the reactants. As a result, the reaction can release energy and do work.


Gibbs free energy is a thermodynamic quantity that combines enthalpy (ΔH, the heat content of a system) and entropy (ΔS, the measure of disorder within a system). It is defined by the equation:

ΔG = ΔH - TΔS

Where T is the temperature in Kelvin. For a reaction to be spontaneous, ΔG must be negative, which means the system is releasing energy and becoming more stable.

In summary, the main driving force for any spontaneous reaction or change in a reaction system is the decrease in Gibbs free energy (ΔG), which indicates a release of energy and increased stability of the system.

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The resistance and the effort force are used to calculate the mechanical advantage. Arranging the threads of the screw closer together will increase the mechanical advantage. Thus, option C is correct.

Mechanical advantage is the ratio of the output force to the input force. It allows easier task performance by obeying the conservation of mass.

The closer threads of the screws make the distance covered to be more, and the force applied will be multiplied which will be a mechanical advantage over threads placed far apart.

Therefore, option C. threads located closer have more mechanical advantages.

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It will take 33 years for a 40-mg sample to decay to a mass of 30.4 mg.

Tο calculate the time it takes fοr a sample οf strοntium-90 tο decay frοm 40 mg tο 30.4 mg, we can use the cοncept οf half-life

Using the half-life formula:

\(\rm A=A_02^{-t/h}\), where

A = resulting amount after time t = 39.6 mg

Ao = initial amount = 90 mg

t = decay time

h = half-life of substance= 28 yrs

Now putting the values into the formula, we get

\($ \rm 39.6=90\times2^{-t/28}\)

\($ \rm 2^{-t/28}=\frac{39.6}{90}=\frac{2.2}{5}\)

Taking logarithm both sides

\($ \rm ln(2^{-t/28})=ln(\frac{2.2}{5})\)

\($ \rm \frac{-t}{28}ln(2)=ln(0.44)\)

\($ \rm t=\frac{-28ln(0.44)}{ln(2)}\)

t = 33.16389

t ≈ 33years

Thus, it will take 33 years for a 40-mg sample to decay to a mass of 30.4 mg.

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Answer:

The answer would probably be C. The clock can be seen and heard.

The mass of hydrogen atoms in the sample of water is 3.98g

This can be solved by understanding of Avogadro's number and mole relationship concept.

This is a proportionality that relates the number of particles to the amount of substance in that sample and it is given as \(6.02*10^2^3\)

A molecule of water have the chemical formula as H\(_2\)O. This implies that for every 1 atom or molecule of oxygen, 2 hydrogen must be present.

In the question given, we have \(12*10^2^3\) atoms of oxygen. This implies we must have \(2*(12*10^2^3)=2.4*10^2^4\)

Now, let's compare this molar mass - Avogadro's number

molar mass of hydrogen = 1g/mol

\(1g/mol=6.023*10^2^3particles\\xg=2.4*10^2^4particles\\x=\frac{1*2.4*10^2^4}{6.023*10^2^3}\\x=3.98g\)

From the calculation above, we would have 3.98g of hydrogen present in that particles of oxygen.

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Answer:

it is the second one. Lead

a. The chemical reaction can be rewritten as a word equation as follows:

Hydrogen Peroxide -> Oxygen + Water

b. Evidence that a chemical reaction has occurred includes the production of a new substance (oxygen and water), a change in the physical properties of the reactants (change in color, odor, or temperature), and the release of energy (evolution of oxygen gas).

c. The reaction is likely exothermic, which means it releases energy. This is because the reaction produces new substances (oxygen and water) and releases energy in the form of oxygen gas. In an endothermic reaction, the reactants would absorb energy from the surroundings.

Yes, it affects the body’s ability to grow and repair cells.

As insulin is a hormone that turns glucose into energy for cellular functions through the process of cellular respiration, the blood glucose level rises when insulin is not produced in sufficient amounts or cells are unable to use the insulin.

The increased blood glucose levels impede the healing of wounds or prevent them from healing or repairing. In such a diabetic case, a small foot wound can grow into a foot ulcer very quickly. When blood sugar levels are high, blood vessels stiffen or constrict, slowing the flow of oxygen through the body in diabetics.

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Answer:

They study different way people have died or could die to better aid investigators.

Explanation:

The Ksp value for calcium hydroxide at this temperature is 5.02 x 10^-6.

Calcium hydroxide (Ca(OH)2) is a sparingly soluble salt. The solubility product constant (Ksp) is a measure of the extent to which the salt dissolves in water at a given temperature. The Ksp value for Ca(OH)2 can be calculated using the given data. First, we can calculate the molarity of the solution using the given volume and mass. Then, we can use the stoichiometry of the balanced equation for the dissolution of Ca(OH)2 to calculate the concentration of Ca2+ and OH- ions in the solution. Finally, we can use the ion product (Qsp) and the Ksp expression to calculate the Ksp value. The calculation gives us a Ksp value of 5.02 x 10^-6 at the given temperature.

Calcium hydroxide (Ca(OH)2), also known as hydrated lime or slaked lime, is a white powder with a soft texture that is frequently utilized as a raw material in the chemical industry. When calcium oxide is mixed with water, it forms. The compound has two hydroxide particles (OH−) for every particle of calcium (Ca2+).

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A solution at pH 1 has more hydrogen ions than a solution at pH 4. The pH of a solution refers to the hydrogen ion concentration.

The concentration of hydrogen ions and the pH of a solution are inversely proportional. This means that the higher the hydrogen ion concentration, the lower the pH, and vice versa.

A solution at pH 1 will have more hydrogen ions than a solution at pH 4.The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration. The equation for calculating the pH of a solution is given as follows:

\($$pH = -\log_{10}[H^+]$$\)

In this equation, [H⁺] is the hydrogen ion concentration in moles per liter (mol/L) of solution. A change of 1 pH unit corresponds to a 10-fold change in the hydrogen ion concentration.

Therefore, if a solution has a pH of 1, it has a hydrogen ion concentration of 0.1 mol/L.

If a solution has a pH of 4, it has a hydrogen ion concentration of 0.0001 mol/L. Thus, a solution at pH 1 has more hydrogen ions than a solution at pH 4.

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The electron configuration of nitrogen change to make a stable configuration c. it would gain three electrons

Electron configuration is the arrangement of electrons in an atom or molecule. This arrangement is based on the principles of quantum mechanics. It determines how atoms interact with each other, which in turn determines the properties of matter.

The electron configuration of nitrogen is 1s² 2s² 2p³. Nitrogen has five valence electrons, three of which are paired in the 2p orbital, while the other two are in the 2s orbital.Nitrogen has an unstable configuration because it needs three more electrons to complete its valence shell, which can be achieved by gaining three electrons. Therefore, the electron configuration of nitrogen would change to make a stable configuration by gaining three electrons.

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Answer

84.8485 g

Explanation

Initial temperature, T₁ = 148 °C

Final temperature, T₂ = 20.4 °C

ΔT = T₂ - T₁

ΔT = 20.4 - 148

ΔT = -127.6 °C

Since heat is released, i.e heat loss, then Q = -324.8 calories

specific heat of the lead bar, c = 0.0300 cal/g°C

Using Q = mcΔT, we can find m as shown below

The mass of the bar is 84.8485 g

The number of valence electron pairs in the outermost shell, as determined by the valence shell electron repulsion theory (VSEPR), determines the molecular shape.

By analyzing the repulsion between bond electron pairs in the outermost electron shell, a process known as the molecular shape can determine the shape of a molecule. Because most physical and chemical properties are influenced by molecular shape, it is crucial to study molecular shape or geometry.

The foundation of VSEPR is minimizing the strength of the electron-pair repulsion surrounding the central atom under consideration. The foundation of the VSEPR theory is the notion that the geometry (shape) of a molecule is primarily determined by the repulsion between the pairs of electrons surrounding a central atom.

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Answer:

what grade is this for and i think ik what the answer is

Explanation:

Separation of mixtures is the process of isolating and purifying individual components from a mixture. It has a wide range of applications in various fields, including chemistry, biology, and environmental science. Here are ten beneficial effects of separation of mixtures:

Helps to obtain pure substances: Separation of mixtures helps in obtaining pure substances, which are essential for research and industrial processes.

Enables identification of individual components: Separation of mixtures allows the identification and characterization of individual components in a mixture.

Allows the removal of impurities: Separation of mixtures can be used to remove impurities from a mixture, which can improve the quality of the final product.

Facilitates recycling: Separation of mixtures is crucial for recycling materials such as plastic, paper, and metals.

Enables selective extraction: Separation of mixtures can be used to selectively extract specific components from a mixture.

Helps in drug development: Separation of mixtures is important in drug development, where pure compounds are required for testing and clinical trials.

Helps in forensic analysis: Separation of mixtures is used in forensic analysis to identify and analyze evidence.

Facilitates food processing: Separation of mixtures is used in the food industry to extract and purify ingredients.

Enables the production of clean energy: Separation of mixtures is used in the production of clean energy, such as separating hydrogen from other gases.

Helps in environmental remediation: Separation of mixtures is used in environmental remediation to separate and remove pollutants from soil, water, and air.

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One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms. 0.138 × 10 ²³ molecules of CO2 are in .023 Liters.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

1 mole of carbon dioxide = 6.023 × 10 ²³ molecules

1 mole = 6.023 × 10 ²³ molecules

Therefore, 0.023 CO₂ = 0.138 × 10 ²³ molecules

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