20g of butanedioic acid were shaken with a mixture of 100 cm3 ether and 100 cm3 water at 298K. After titration with standard sodium hydroxide, it was noted that the ether layer needed 12.4mL of 0.2 mol dm-3 solution for complete neutralisation. Calculate the partition co-efficient.

The elements on the periodic table are organized according to their atomic number or the number of protons in the nucleus of an atom. This number determines the element’s chemical properties and behavior.

The atomic number of an element is equal to the number of protons in the nucleus and is usually indicated by a subscript to the left of the chemical symbol. The periodic table is also organized by the element’s atomic mass or the total number of protons and neutrons in the nucleus.

This number is usually indicated by a superscript to the left of the chemical symbol. The periodic table is also organized alphabetically by the element’s name and symbol. This allows for quick identification of elements and their properties.

Finally, the number of higgs bosons in an element is irrelevant to the organization of the periodic table. Higgs bosons are elementary particles that are present in all matter and are responsible for giving mass to particles.

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Gibbs free energy change for the reaction at 29°C.  is equal to -1378.93 KJ.

Gibbs free energy can be described as the enthalpy of the system minus the product of the temperature and entropy.

If the chemical reaction can be carried out under constant temperature ΔT = 0:

ΔG = ΔH – TΔS

The above equation is known as the Gibbs-Helmholtz equation.

ΔG > 0 non-spontaneous and endergonic and ΔG < 0 spontaneous and exergonic, ΔG = 0 is representing equilibrium.

Given the ΔS = -364 J/K, ΔH = -1269.8 KJ, T = 29°C = 29 + 273 = 302 K

ΔG = - 1269 - 302 × 364

ΔG =  -1269 KJ - 109.93 KJ

ΔG =  - 1378.93 KJ

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Your question is incomplete, most probably the complete question was,

2Ca(s)+O₂(g) → 2CaO(s)

ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K

For this problem, assume that all reactants and products are in their standard states.

Calculate the free energy change for the reaction at 29°C.

Entropy is an indicator of the randomness of the system. Entropy is a measure of the amount of energy in a system that is unavailable for doing useful work. The greater the entropy, the more randomized the system is, indicating that it is less likely to be able to do useful work.

In this case, we need to rank the following substances from the least to greatest in terms of standard entropy (1 as the least and 4 as the greatest) CO(l) = 2. CO(s) = 1. CO2(g) = 4. CO(g) = 3.Carbon monoxide has a liquid and solid phase at standard pressure, but its gas phase has a higher standard entropy because it is more randomized. CO2 is a more disordered and randomized system than CO because it is a gas. CO has a liquid and solid phase, but they are less disordered than the gas phase because the molecules are more structured. Therefore, the correct answer to the question is: CO(l) = 2. CO(s) = 1. CO2(g) = 4. CO(g) = 3.

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The mass of NaOH present in the solution is, 0.0625 grams

The mass is defined as the quantity of the matter present in the solution or in any substance.  

Given that,

Mass % of NaOH in the solution= 25 %

Mass of solution = 0.250 g

The formula will be

\(\rm Mass\ percent=\dfrac{mass \ of\ NaOH}{Mass\ of\ solution} \times 100\)

\(25=\dfrac{\rm Mass\ of \ NaOH}{0.250} \times 100\)

Mass of NaOH=0.0625 gram

Thus the mass of NaOH present in the solution is, 0.0625 grams

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The mass of NaOH present 0.250 grams of solution is 0.0625 grams.

Mass of any substance present in any solution will be calculated by using their & mass as below:

Mass percent = (Mass of solute / Mass of solution) × 100

Given items according to the question,

% mass of NaOH = 25%

Mass of solution = 0.250g

Now e put these values on the above equation and we get,

Mass of NaOH = (5 × 0.250) / 100 = 0.0625 grams.

Hence, mass of NaOH is 0.0625 grams.

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Answer:

A physical change

Explanation:

A physical change is a form of transformation in which an element or matter changes from one material state to another. For example from solid-state to liquid state through melting. Another is crushing and freezing.

Hence in this case, when a liquid is cooled during an investigation causing it to solidify. The process is called Freezing which occurred as a result of a PHYSICAL CHANGE.

Answer:

4.9 x 10²²hockey pucks

Explanation:

Given parameters:

Number of moles of hockey  = 0.0814moles

Unknown:

Number of pucks there = ?

Solution:

A mole of a substance is made up of Avogadro's number of particles.

Therefore;

       1 mole of hockey pucks will contain 6.02 x 10²³ hockey pucks

       0.0814 mole of hockey pucks will contain :

                              0.0814 x 6.02 x 10²³ = 4.9 x 10²²hockey pucks

False. Filtration and reabsorption are processes that involve both water (a solvent) and solutes. In the context of the human body, these processes occur primarily in the kidneys, where they play essential roles in maintaining the balance of fluids and electrolytes.

Filtration is the process by which blood is filtered through the glomerulus, a network of capillaries in the nephron (the functional unit of the kidney). In this process, water and solutes such as ions, glucose, and amino acids are filtered from the blood plasma into the Bowman's capsule, while larger molecules like proteins and blood cells are retained in the bloodstream.

Reabsorption, on the other hand, is the process by which filtered substances are selectively transported back into the blood circulation from the renal tubules. During reabsorption, essential solutes and water are returned to the blood, while waste products and excess substances continue their journey through the nephron to be excreted in the urine.

Both filtration and reabsorption are crucial for maintaining homeostasis in the body. These processes regulate the composition of blood, control blood pressure, and help maintain the balance of water and electrolytes in the body. Therefore, it is incorrect to say that these processes involve only water and not solutes, as solutes play an essential role in both filtration and reabsorption.

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The equation HA + H2O ⇌ A- + H3O+ represents the ionization of an acid in an aqueous solution. In this equation, HA is the acid, A- is the conjugate base, and H3O+ is the hydronium ion.

Ka, also known as the acid dissociation constant, is a measure of the strength of an acid. It represents the extent to which the acid ionizes in water.

A large value of Ka indicates that the equilibrium lies far to the right, which means that the acid is strong. This means that the acid will completely ionize in water to form A- and H3O+. In contrast, a weak acid will only partially ionize in water, and the equilibrium will favor the formation of HA rather than A- and H3O+.

In summary, a large value of Ka indicates that the acid is strong, while a small value of Ka indicates that the acid is weak. The strength of an acid is determined by the extent to which it ionizes in water. A strong acid completely ionizes in water, while a weak acid only partially ionizes.

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There are 20.8 moles of propanol

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

1.2 x 10⁵ molecules of propanol

\(\tt \dfrac{1.25\times 10^{25}}{6.02\times 10^{23}}=20.8~moles\)

question 11 = B.metal,loses electrons

Answer:

kinetic, thermal and chemical not physical

The following are types of energy:

Energy in physics is the ability to do work. Generally it can be said to be the strength, power or ability to do work.

Energy can be contained in a system, can be transformed and can be transfered.

different types of energy are needed in our day to day living.

In conclusion, the types of energy we have are the Thermal Energy, Chemical Energy, and Kinetic Energy etc.

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A) The value of equilibrium constant is 2.00. B) The initial state represents 8.00 moles of AB2+. C)  The reestablished equation is AB2+ particles react with the additional Cl- ions, resulting in the formation of ABCl2. D) The concentrations of A3+ and B+ would remain constant

A) In order to find the value of the equilibrium constant, K, we use the formula

Kc = [AB2+] / [A3+][B+]

Here, we are :[A3+] = 1.00 moles[B+] = 4.00 moles[AB2+] = 8.00 moles

Substituting the values into the equation, we get

Kc = [AB2+] / [A3+][B+]

Kc = 8.00 / (1.00 x 4.00)

Kc = 2.00

B) Since it's not possible to directly draw images here, I'll describe the initial state:

In the initial state, we have a 1.00-liter container filled with water. In the container, there are 1.00 moles of A3+ (represented as particles labeled "A"), 4.00 moles of B+ (represented as particles labeled "B"), and 8.00 moles of AB2+ (represented as particles labeled "AB" with a charge of 2+).

C) The first model to represent the occurrence when 13.00 moles of ABCl2 is added:

In the container, add 13.00 moles of ABCl2. ABCl2 dissociates into AB2+ (represented as particles labeled "AB" with a charge of 2+) and 2 Cl- ions. Therefore, you would have additional AB particles and 26.00 moles of Cl- ions. The overall charge of the system remains balanced.

The second model represents the reestablishment of equilibrium after the addition:

The AB2+ particles react with the additional Cl- ions, resulting in the formation of ABCl2 (represented as particles labeled "ABCl2"). This reaction consumes AB particles and Cl- ions until a new equilibrium is established. The equilibrium concentrations of A3+, B+, and AB2+ remain the same as initially.

D) The graph that represents the changes mentioned above would have concentration (or moles) on the y-axis and time on the x-axis. Initially, you would have a horizontal line representing the constant concentrations of A3+, B+, and AB2+. When the ABCl2 is added, there would be a sudden increase in the concentration of AB2+ and Cl- ions, represented by a step increase in the graph. As the reaction proceeds to reestablish equilibrium, the concentrations of AB2+ and Cl- ions would gradually decrease, represented by a decreasing slope on the graph until a new equilibrium is reached. The concentrations of A3+ and B+ would remain constant throughout, represented by horizontal lines.

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Complete question is:

"YOU DO: 1) Consider the reaction A3+ (aq) + B+ (aq) = AB2+ (aq) A) In 1.00 Liter of water at equilibrium, there are 1.00 moles of A3+, 4.00 moles of B and 8.00 moles of AB2+(ag). What is the value for the equilibrium constant? B) Draw an image to represent this initial state. (below) C) At some time, t, 13.00 moles of ABCl2 is added, the volume change is negligible. ABC12 is a completely soluble compound that forms AB2+ (aq) and 2 Cl(aq) ions, the chloride ions are spectator ions and do not affect the equilibrium, you do not have to include them in the diagram. Draw two models to represent this occurrence; one for the instant the substance was added and once to show the reaction reestablishing the equilibrium. Key A3+ (aq) Baq) AB2+ (aq) X Initial state Addition of AB2+ (aq) Reestablish the equilibrium D) Sketch a graph that represents the changes shown above."

Answer:

flow of electrons

Explanation:

took the quiz

Answer:

gasoline

Explanation:

The mass of the other boron isotope is  11.0 u.

We know that isotopes do not have the same mass number but they do have the same atomic number because they come from the same element as we know.

Now we can see that;

Average atomic mass = Sum  of the weighted masses of the isotopes.

Let the unknown mass be x

10.81 = (10.012938 * 0.198) + (x * 0.802)

10.81 = 1.98 + 0.80x

x = 10.81 - 1.98/0.80

x = 11.0

Thus the other isotope is found to have a mass of about  11.0 .

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Answer:

Explanation:

????? i am having trouble according this

Answer:

New ideas would be created and tested

Explanation:

All old ideas would be discarded.

Scientific evidence would be weakened.

New ideas would be created and tested.

The limitations of science would be evident.

In science, old ideas are usually improved or modified and not entirely discarded. The old ideas form the basis for new ideas after extensive reviews. Differences in the interpretations made by scientists on any particular phenomenon give rooms for reviews. The reviews often generate new ideas or hypotheses and these can be tested using relevant experimental procedures according to the scientific method.

Hence, the correct answer would be that new ideas would be created and tested.

Answer:

1

Explanation:

Formula of molarity is

\(M=\frac{n}{v}\)

M= molarity

n= no of moles

v= volume in liters (if mL then you have to convert it to L)

Answer:

Cell

A cell is the smallest unit of a living thing. Cells are the basic building blocks of all organisms

Answer:

123.5 kPa

Explanation:

P2=P1T2/T1

You can check this by knowing that P and T at constant V have a proportional relationship. Hence, this is correct.

positive, negative, positive are the entropy changes of the sugar plus water, the surroundings and the universe respectively

∆s of system is positive because it is becoming more disordered as it becomes a mixture as sugar dissolves.

∆s of surroundings is negative because it is giving heat to system (losing heat) so it is becoming more ordered.

∆s of the universe is positive because the reaction is spontaneous-- second law of thermo.

In spontaneous changes, the universe tends toward a state of greater disorder

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Answer: °32= 0 °C.

Explanation:

Answer:

Explanation:

Please add the temperature readings from all three trials for both thermometers. Will do the calculation with readings.

Answer:

oxidation, synthesis, polymerization.

Answer:

Medium is the answer

Answer:

Like signs.

Explanation:

When two charges are like signs, a repelling force will occur.

Answer:

B

Explanation:

Correct on Edge 2021

The crystallization step of recrystallization removes soluble impurities from a solid mixture. When a solid is dissolved in a solvent and then allowed to cool, the solubility of the solid in the solvent decreases and the solid crystallizes out of the solution.

Soluble impurities, which are typically more soluble in the solvent than the desired compound, will remain in solution or be incorporated into the crystal lattice of the impure crystals. As a result, the crystals that form during the crystallization step will have a higher purity than the initial solid mixture. Further purification can be achieved through multiple rounds of recrystallization using different solvents or by additional purification methods such as chromatography.

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Exothermic reaction

Energy diagrams can help us determine how the energy of reactants changes throughout a reaction.

Energy Diagrams

The purpose of energy diagrams is to show how the energy of reactants and products changes over time.

In the diagram, A is the activated complex. This is the intermediate compound that forms from the reactants before the products are made.

B is the activation energy. This is the amount of energy required for the reaction to occur.

C is the energy of reaction. This is the energy that a reaction absorbs or releases.

Energy of Reaction

Exothermic reactions release energy, and endothermic reactions absorb energy. This means that in exothermic reactions the reactants have higher energy than the products. On the other hand, in endothermic reactions, the reactants are lower energy than the product. In this reaction, the reactants are higher energy, so the reaction is exothermic. This means that energy is released, and the energy of reaction will be negative.

Catalyst

A catalyst is a compound that can be added to a reaction to increase the rate of reaction. Catalysts increase the rate of reaction by decreasing the activation energy. This makes the reaction more likely to occur and speeds up the reaction. Catalysts also decrease the energy of the activated complex.

Answer:

no it should not that place is historical and so they should make where u can visit but protect it as a historical landmark