what is the change in the free energy, ∆g°, for the reaction? 4 kclo3(s) 3 h2s(aq) → 4 kcl(s) 3 h2so4(aq) substance ∆gf° (kj/mol) kclo3(s) -296.3 h2s(aq) -27.7 kcl(s) -408.5 h2so4aq() -744.6

Answer: possibly diffusion

Explanation:

all particles are in motion unless at a certain degree so they'd spread throughout the room diluting as they continue to spread out.

The calculated value of the cell potential at 298K for an electrochemical cell, \(Mn(s)/Mn^{2+}(1.42M)||Cu^{2+}(8.24 × 10^{-4}M)/Cu(s)\), is equals to the - 0.0868 V. It is true that the reaction is spontaneous for specify concentration.

We have an electrochemical cell with the following reaction, Cu²⁺ (aq) + Mn(s) --> Cu(s) + Mn²⁺ (aq)

Concentration of Cu²⁺ = 8.24 × 10⁻⁴ M

Concentration of Mn²⁺ = 1.42 M

Temperature, T = 298 K

There are 2 half-cell equations,

\(Cu^{2+}_{(aqu)}+2e^{-}\rightarrow Cu_{(s)}\)

The above one represents the reaction in the reduction half-cell(Cathode). The cell potential for this reaction is

\(E=E^{0}- \frac{0.0592}{n}log\frac{1}{[Cu^{2+}]}\)

where E⁰ is the standard electrode potential and is 0 for this cell (concentration cell with the same element as anode and cathode) and n is the number of electrons involved. Here, [Cu²⁺] = 8.24 × 10⁻⁴ M

\(E=0- \frac{0.0592}{2}log\frac{1}{[8.2 × 10^{-4}]}\)

= -0.09135V

Similarly for the oxidation half-reaction in the anode, \(Mn_{(s)}\rightarrow Mn^{2+}_{(aqu)}+2e^{-}\)

[Mn²⁺ ] = 1.42 M

\(E=0- \frac{0.0592}{2}log\frac{1}{[1.42]}\) = -0.00451 V

cell potential of the reaction can be calculated by the formula, \(E_{cell}=E_{cathode}-E_{anode}\)

= -0.09135 - (-0.00451)

= - 0.0868 V

Since Ecell < E⁰ the given reaction is spontaneous. Hence, reaction is spontaneous reaction.

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Complete question:

What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Cu2+ concentration is 8.24×10-4 M and the Mn2+ concentration is 1.42 M ? Cu2+(aq) + Mn(s) Cu(s) + Mn2+(aq) Answer: ______V The cell reaction as written above is spontaneous for the concentrations given: true/false.

Answer:

Option B) Ba and O (Barium and Oxygen)

Explanation:

Barium and oxygen elements are the pairs which are most likely to be the part of polyatomic ion. As barium has +2 charge and Oxygen has -2 charge which will be settle once they form an polyatomic ion.

a) The substance X is likely to be lead nitrate (Pb(NO₃)₂)

b) substance which the yellow solid consists of lead iodide (PbI₂).

c) The characteristic of chemical reactions that is illustrated by this example is the formation of a precipitate.

d) The balanced chemical equation for the reaction that takes place is:

Pb(NO₃)₂ (aq) + 2KI (aq) → PbI₂ (s) + 2KNO₃ (aq)

The material X is probably lead nitrate(Pb(NO₃)₂)  since it interacts with potassium iodide (KI) to produce lead iodide (PbI₂), a yellow solid. Lead iodide is the yellow solid that separates from the solution (PbI₂).

The production of a precipitate is a property of chemical processes that is demonstrated by this example. A precipitate is a solid that develops during a chemical reaction from a solution.  The reaction's balanced chemical equation is as follows:

Pb(NO₃)₂ (aq) + 2KI (aq) → PbI₂ (s) + 2KNO₃ (aq)

In this equation, the physical states of the reactants and products are indicated in parentheses. The aqueous solutions of lead nitrate and potassium iodide are indicated by (aq), and the solid lead iodide is indicated by (s). The aqueous solution of potassium nitrate is also indicated by (aq).

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Answer:

1.This answer would be option A.

2. I think that would be 1350

Explanation:

Answer:

D. formation of zinc from zinc sulphide ​

Explanation:

A redox reaction could be explained as an artificial reaction in which electrons are moved between two reactants partaking in it. This substitution of electrons can be recognized by examining the variations in the oxidation states of the reacting classes. The generation of hydrogen fluoride is an illustration of a redox reaction. We can crack the reaction down to investigate the oxidation and loss of reactants.

Answer:

The answer I would go with is A formation of a new substance.

Explanation:

This is because physical change includes changes of state. Some could be changing from a liquid to gas or solid to gas. B is not even an answer that should be considered because it doesn't fit into the category. C and D represents some of the examples of the process of physical change. Like boiling, bubbling, melting, or freezing. So the best would be A.

Answer: 2 : 1

Explanation:

Cation :

Ca - calcium = atomic number = 20

Electron dot configuration : 2, 8, 8, 2

Ca losses 2 electrons in its outermost shell and thus has a charge of 2+ in other to attain a stable octet state.

Anion:

F - has 7 valence electrons and thus needs 1 electron to achieve a stable octet state, hence it accepts one electron has has a charge of (-1)

Therefore,

Ratio of cation (+) to negative (-) = 2 :1

Answer:977.34

Explanation:

divide 2551 and 273 to get 3.778. then multiply 3.78 by 273 to gry 977.34.

The major factors influencing fusion consist of the required high temperature and high pressure which is not shown in the model and hence becomes one of its limitations.

Two major requirements for fusion are:

1) The energy from the high temperature allows the hydrogen atoms to overcome the electrical attraction between the protons. Temperatures of roughly 100 million Kelvin are necessary for fusion. Hydrogen is not a gas at these temperatures; it is a plasma. The high-energy state of matter known as plasma is one in which all atoms have had their electrons removed and are now free to move about. The sun's massive mass and the compression of that mass in the core caused by gravity allow it to reach these temperatures.

2) The hydrogen atoms are compressed together by high pressure. For Fusion, they need to be within 1x10-15 meters of one another. The sun compresses hydrogen atoms together in its core using gravity and its bulk. We must use strong magnetic fields, potent lasers, and ion beams to force hydrogen atoms together.

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The correct answer is D. Reactants are substances that are combined to form products in a chemical reaction. Products are the result of substances being combined in a chemical reaction.

Answer:

Chemical reaction

Explanation:

After new substances are formed they can't be reversed to their original state.

Answer:

Skeletal

Cardiac

Smooth

Explanation:

The body contains three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscl

Answer:

where the slope of the titration curve is the greatest

The titration curve can be used to identify the equivalency point of the titration.The volume of titrant is where the titration curve has the steepest slope.

How do you find the equivalence point on a titration curve?

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Answer:

tty to fin out what happend by redoing it

If calcium carbonate is heated strongly, carbon dioxide gas is driven off , leaving a residue of calcium oxide then the  unbalanced chemical reaction for this process is given as ,

\(CaCO_{3}\) → \(CO_{2}\) + CaO

A chemical equation that is out of balance has an uneven number of atoms from various elements in the reactants and products side . Chemical equations must be balanced since they are not accurately represented when they are unbalanced .

In balanced chemical equation the number of atoms in reactant side is equal to the number of atoms in product side .

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The mass of one molecule of pentane is approximately 7.22 x

\( {10}^{5} \)

kg when expressed on a per molecule basis.

To calculate the mass of one molecule of pentane, we need to know the molecular formula of pentane, which is C5H12.

The atomic mass of carbon is 12.011 g/mol, and there are 5 carbon atoms in pentane, so the total mass of carbon in one molecule of pentane is:

5 carbon atoms x 12.011 g/mol = 60.055 g/mol

The atomic mass of hydrogen is 1.008 g/mol, and there are 12 hydrogen atoms in pentane, so the total mass of hydrogen in one molecule of pentane is:

12 hydrogen atoms x 1.008 g/mol = 12.096 g/mol

Therefore, the total mass of one molecule of pentane is:

Total mass = Mass of carbon + Mass of hydrogen

Total mass = 60.055 g/mol + 12.096 g/mol

Total mass = 72.151 g/mol

We need to convert this to kilograms, which we can do by dividing by 1000:

72.151 g/mol ÷ 1000 g/kg = 0.072151 kg/mol

Finally, we can express this answer in scientific notation to three significant figures:

m =

\(7.22 x {10}^{5} kg/mol\)

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Answer: C12H12N2O2

Explanation:

atomic number 15

1S^2,2S^2,2P^6,3S^2,3P^3

atomic number 12

1S^2,2S^2,2P^6,3S^2

atomic number 9

1S^2,2S^2,2P^5

atomic number 18

1S^2,2S^2,2P^6,3S^2,3P^6

Answer:

d

Explanation:

Option (D) helium (He) and hydrogen (H) is the right answer.

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Answer: Helium, Hydrogen

Explanation: I got it right

To convert from the moles of one substance to the moles of another substance the one that allows is the correct option is D. A balanced chemical equation.

The balanced equation is the the chemical equation in which the number of the moles of the atoms in the reactant side is equals to the number of the moles of the product side of each of the atom. From the balanced chemical equation we will find out the moles of the substance that involves in the chemical reaction.

Thus, from the balanced chemical equation we will convert the moles of the one substance to moles of the another substance.

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Answer: The answer is B. The pressure inside the tires increased.

Explanation:

The relationship between the pressure, volume, and temperature of a gas is described by the ideal gas law, which is usually written as:

\($$PV = nRT$$\)

where:

- \(\(P\)\) is the pressure,

- \(\(V\)\) is the volume,

- \(\(n\)\) is the number of moles of gas,

- \(\(R\)\) is the ideal gas constant, and

- \(\(T\)\) is the temperature (in Kelvin).

In this case, the volume \(\(V\)\) and the number of moles \(\(n\)\) of air in the tires stay the same. The temperature \(\(T\)\) is increasing. Therefore, for the equation to remain balanced, the pressure \(\(P\)\) must also increase.

So, the answer is B. The pressure inside the tires increased.

Answer: the earth is orbiting

Explanation: it changes and orbits

NAD+ and NADP+ are important coenzymes in cellular metabolism, involved in redox reactions and energy transfer. While they are equivalent in their tendency to attract electrons, their concentrations inside cells are greatly different. One possible explanation for this is their distinct roles in different metabolic pathways.

For instance, NAD+ is mainly involved in catabolic processes, such as glycolysis and the citric acid cycle, while NADP+ participates in anabolic processes, such as fatty acid and nucleotide synthesis. As a result, the concentration ratio of [NAD+]/[NADH] tends to be higher than unity, which favors substrate oxidation, while the [NADP+]/[NADPH] ratio is less than unity, which favors substrate reduction.

Another possible explanation is the regulation of enzymes involved in their synthesis and degradation. For example, the rate of NAD+ biosynthesis can be controlled by the availability of its precursors, such as nicotinamide and tryptophan. In addition, the degradation of NADH and NADPH can be regulated by enzymes such as alcohol dehydrogenase and glucose-6-phosphate dehydrogenase, respectively. Overall, the maintenance of NAD+ and NADP+ concentrations in cells involves a complex interplay of metabolic pathways and enzyme regulation, which is essential for cellular function and homeostasis.

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E1 product is not observed in the reaction of ethanol with bromotriphenylmethane.

In the reaction of ethanol with bromotriphenylmethane, E1 product is not observed. Why?When an alcohol is reacted with HBr, it forms an alkyl halide. This is an example of nucleophilic substitution. The reaction follows an S_N1 or S_N2 mechanism, depending on the structure of the alcohol. E1 elimination is also possible, but it is rare. When ethanol reacts with HBr, it follows an S_N1 or S_N2 mechanism to form ethyl bromide. In this reaction, bromotriphenylmethane is reacted with ethanol to give triphenylmethanol and ethyl bromide as products.

The reaction takes place through an S_N1 mechanism. When the reaction occurs, the ethanol molecule replaces one of the bromine atoms on the bromotriphenylmethane molecule to create a new intermediate, which is more stable than the original compound. The intermediate has a cationic center with the positive charge on the central carbon atom (trityl carbon).

This trityl carbocation is highly stable because it is surrounded by three bulky phenyl groups that shield it from nucleophilic attack. The intermediate reacts with ethanol to form the desired products, triphenylmethanol and ethyl bromide. Therefore, E1 product is not observed in the reaction of ethanol with bromotriphenylmethane.

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