An erlenmeyer flask containing 20. 0 ml of sulfuric acid of an unknown concentration was titrated with exactly 15. 0 ml of 0. 25 m naoh solution to the equivalence point. What was the concentration of sulfuric acid in the flask?.

The above given statement is true.

A homogeneous mixture comprised of two or more components is referred to as a solution. Because they are consistently scattered at the molecular or ionic level, the components in a solution are evenly mixed and have a constant composition.

Until the reaction between the two solutions is complete, a solution of known concentration is gradually added to a solution of unknown concentration in a titration. The endpoint, or point at which the reaction is finished, is often identified by a color change that takes place after an indicator is added to the solution being titrated.

The reaction has achieved its endpoint when the solution in the flask changes color, and the new color persists even after the solution is gently shaken. At this time, the titration should be halted. By doing this, it is possible to precisely determine the concentration of the unknown solution and the volume of titrant added to the solution.

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Answer:

32,256g/mol

Explanation:

n= V/Vm

n = 0.25/22.4

n = 0.01

0.01 = 0.36/M

M = 0.36/0.01

The formation of enol is more favorable in dimedone compared to cyclohexanone due to the presence of keto-enol tautomerism and the stabilization of the enol form.

In dimedone, the presence of two electron-withdrawing carbonyl groups (C=O) on adjacent carbon atoms allows for the formation of an enol tautomer. The enol form is stabilized through intramolecular hydrogen bonding between the hydrogen atom of the enol group and the oxygen atom of the neighboring carbonyl group. This hydrogen bonding imparts additional stability to the enol form, making its formation more favorable. On the other hand, cyclohexanone lacks the electron-withdrawing carbonyl group in close proximity to facilitate enol formation. The absence of adjacent carbonyl groups hinders the formation of the enol tautomer and reduces the stability of the enol form. As a result, the formation of enol is less favorable in cyclohexanone compared to dimedone.

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The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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The hydronium ion concentration when pH = 7 is :  8.75 * 10⁻⁹ mole/liter

Given that :

pH = 8.0

Hydronium ion concentration = 1 * 10⁻⁸ mole/liter

Resolving the question

8.0 = 1 * 10⁻⁸ mole/liter

7.0 =  x

therefore :

x = 7 ( 1 * 10⁻⁸ ) / 8.0

  = 8.75 * 10⁻⁹ mole/liter

Hence we can conclude that The hydronium ion concentration when pH = 7 is :  8.75 * 10⁻⁹ mole/liter

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Peroxidase activity increases and then decreases due to a change from a moderately acidic environment (pH near 6) to a basic environment.

Peroxidase is an enzyme found in a wide variety of organisms, from plants to humans to bacteria. Its function is to decompose hydrogen peroxide (H₂O₂). Hydrogen peroxide is one of the toxins produced as a by-product of using oxygen to breathe. (The fact that hydrogen peroxide is toxic makes it useful in first aid kits.

Peroxidase activity is strongly influenced by pH factors. Peroxidase works best at pH 7, but increasing or decreasing pH adversely affects its activity. Therefore, when moving from a weakly acidic environment close to pH 6 to a basic one, the peroxidase activity increases as the neutral environment approaches and decreases as the basic environment approaches, so that the peroxidase activity varies with the pH of the solution.

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The complete question is as follows:

Researchers investigated the influence of environmental pH on the activity of peroxidase, an enzyme that catalyzes the conversion of hydrogen peroxide to water and oxygen gas. In an experiment, the researchers added a hydrogen peroxide solution containing guaiacol to several identical test tubes and adjusted the solution in each test tube to a different pH . The researchers included the guaiacol because it caused the solutions to change color as the reactions proceeded, which the researchers relied on for measuring reaction rates. Finally, the researchers added the same amount of peroxidase to each test tube and measured the rate of each reaction at 23°C . The results of the experiment are represented in Figure 1.

Based on Figure 1, which of the following statements best predicts the effect that a change from a moderately acidic environment ( pH near 6) to a basic environment will have on peroxidase activity?

answer choices

Peroxidase activity will decrease.

Peroxidase activity will increase.

Peroxidase activity will stay the same.

Peroxidase activity will increase at first and then decrease.

The first occasion a Rh-negative patient receives Rh-positive blood, a transfusion reaction does not happen also because Rh-negative patient has not had time to develop antibodies against by the Rh-positive blood.

Some patients can have negative reactions towards the plasma they obtain after a donation, even when the right blood type is used. Some of the symptoms under these circumstances include hives and itching. Like other allergic reactions, this can be managed with medications. However, a professional should be sought if the reaction gets worse.

An acute immune hemolytic event, a very hazardous but unusual occurrence, can occur when the immune system rejects the directly injected red blood cells. The attack causes the discharge of a substance that damages the kidneys.

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Answer:

The specific heat of the unknown metal is 1.26*10⁻⁴ \(\frac{kcal}{g* C}\)

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat occurs when heat added or removed from a substance causes a temperature change in it and is calculated by:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT (Tfinal - Tinitial) is the variation in temperature

In this case:

Replacing:

2.93 kcal= c* 183.4 g*126.3 °C

Solving:

\(c=\frac{2.93 kcal}{183.4 g* 126.3 C}\)

c= 1.26*10⁻⁴ \(\frac{kcal}{g* C}\)

The specific heat of the unknown metal is 1.26*10⁻⁴ \(\frac{kcal}{g* C}\)

Answer:

The answer should be D

Explanation:

because turning 1 mole of propane to grams means its still one mole of propane just in a different unit.

Answer:

sodium I think .............

Explanation:

The atoms are chemically bonded together, and they retain their individual physical and chemical properties.

Answer:

The atoms can only combine in fixed ratios, and they can only be separated by a chemical change.

Explanation:

just took the test the other guys thing was wrong

Answer:

31.3 pounds

Explanation:

300x365=109,500  109,500/3500=31.3 or (31 if you round)

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

Individual solute particles are broken apart from the solid by the;

c. Solvent

Explanation:

A solution is the homogeneous mixture that is made up of two or more substances formed by dissolving a substance which can be a solid, liquid or gas in another substance known as the solvent which normally the larger part of the fraction of the solution than the solute and can also be a solid, liquid or a gas

In a solution the solvent particles serves to brake of and disperser parts of a solid solute to form a more or less homogeneous mixture

Therefore, the solute particles are broken by the solvent particles in a solution

Answer:

Option B. It is a basic solution.

Explanation:

To know which option is correct, let us calculate the pH of the solution.

First, we shall determine the pOH of the solution. This is illustrated below:

Concentration of Hydroxide ion, [OH¯] = 3.5×10¯⁶

pOH =.?

pOH = –Log [OH¯]

pOH = –Log 3.5×10¯⁶

pOH = 5.5

Finally, we shall determine the pH. This can be obtained as follow:

pOH = 5.5

pH =?

pH + pOH = 14

pH + 5.5 = 14

Collect like terms

pH = 14 – 5.5

pH = 8.5

The pH scale reads as follow:

0 to 6 => Acidic

7 => Neutral

8 to 14 => Basic

Comparing the pH of the solution (i.e 8.5) with the pH scale, we can conclude that the solution is basic because the pH of solution lies between 8 and 14.

The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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Answer:

Silica (quartz): Silica, SiO2, is a chemical compound that is composed of one silicon atom and two oxygen atoms. It appears naturally in several crystalline forms, one of which is quartz.

Explanation:

Protons (H⁺) are pumped across the inner mitochondrial membrane as part of the process called electron transport chain, which is an essential step in cellular respiration.

The electron transport chain is responsible for generating adenosine triphosphate (ATP), the main energy currency of cells.

During cellular respiration, electrons are transferred from high-energy molecules (such as glucose) through a series of electron carriers embedded in the inner mitochondrial membrane. As electrons pass through the electron transport chain, energy is released and used to pump protons (H⁺) from the mitochondrial matrix to the intermembrane space.

There are some several reasons;

Establishing an Electrochemical Gradient; The pumping of protons across the inner mitochondrial membrane creates an imbalance of protons, resulting in a higher concentration of protons in the intermembrane space compared to the matrix.

Generation of ATP; The electrochemical gradient created by the proton pumping is utilized by ATP synthase, an enzyme complex embedded in the inner mitochondrial membrane.

Coupling Electron Transport with Proton Pumping; The pumping of protons across the inner mitochondrial membrane is coupled with the flow of electrons through the electron transport chain.

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This outcome is conceivable. Since Cr has a lower reactivity than K, it cannot remove K from its complex.

Condensation reactions (and their opposite, cleavage reactions), exchange reactions, acid-base interactions, and oxidation-reduction processes are the five categories into which the majority of chemical reactions can be divided.

The five main categories into which the bulk of chemical reactions can be grouped are acid-base reactions, exchange reactions, condensation reactions (and its opposite, cleavage reactions), and oxidation-reduction reactions.

The classification strategy is purely for convenience; a reaction may be classified in a number of ways depending on which of its characteristics is most important. Condensation processes are covered in this section.

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Answer:

C

Explanation:

Li + ZnCO3 -->

Answer:

178.3 L

Explanation:

178,300/1000

Answer:

Beta β

Explanation:

Beta particles are negatively charged electrons emitted by the nucleus on decay

The correct statements about the energy levels of electrons in shells are the following:

They are the energy charge that an electron possesses, where in each period (in each shell) only a certain number of electrons fit.

Therefore, we can conclude that the electrons of an atom have different energy levels, so they are classified by the energy level in which each of them is located.

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Answer:

60 ml

Explanation:

Now, we know that density = mass/volume

Mass of aluminium = 67.5 g

volume of aluminium =?

density of aluminium = 2.70 g/mL

volume of aluminium = mass/density = 67.5/2.70 = 25 ml

Since volume of water in the cylinder = 35 ml

The water rises to ; 35 ml + 25 ml = 60 ml

A gaseous compound is subjected to increased pressure. What is happening to the temperature at the same time?

We assume the gas is in a container.

If we increase the pressure, is a direct relationship with temperature, so the temperature increases, but if the volume is not constant, it will decrease.

Answer: increased temperature, decreased volume.

To create a balance sheet for the year prior on Part C using column E, list the assets and liabilities in column E, calculate the total assets and total liabilities, and then subtract the total liabilities from the total assets to find the owner's equity. To create a balance sheet for the year prior on Part C using column E, follow these steps:

1. Start by listing all the assets in column E. Assets are items of value owned by the company. Examples of assets include cash, accounts receivable, inventory, and property. Enter the values of each asset in column E.
2. Next, list all the liabilities in column E. Liabilities are the debts and obligations of the company. Examples of liabilities include accounts payable, loans, and taxes payable. Enter the values of each liability in column E.
3. Calculate the total assets by adding up the values in column E for all the assets.
4. Calculate the total liabilities by adding up the values in column E for all the liabilities.
5. Subtract the total liabilities from the total assets to find the owner's equity. Owner's equity represents the owner's investment in the company and is calculated as the difference between assets and liabilities.
6. Finally, list the owner's equity in column E.

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Answer: Hydrogen

Explanation: The Bohr Atom is a very simplified model of the electron positions of each element of the Periodic Table. Each Row of the periodic table is represented by an orbit. Hydrogen and Helium are in the first energy level (row) of the periodic table and their Bohr Models would have one orbit.

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Answer:

B) change in color

Explanation:

The evidence of a chemical change includes a change in color. Thus, the correct option for this question is B.

A chemical change may be defined as a type of change that significantly involves the transformation of one chemical substance into one or more different substances. It type of change typically produces a new substance that is not earlier present during the reaction.

The attributes like change in size, change in shape, and change in weight demonstrate evidence of physical change. While the change in color completely transforms its appearance as compared to the previous.

It includes examples like burning of coal, rusting of iron, boiling of eggs, digestion of food, etc.

Therefore, the change in color is evidence of a chemical change. Thus, the correct option for this question is B.

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