The equivalence point in the titration of this weak acid is 50. 80 ml. At 25. 40 ml, the ph was measured to be 3. 86. Calculate the ka of the unknown acid.

A) CaCl2

Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.

Answer:

valence electrons

Answer:

if you search up the periodic table and go to any website it will let you press on the element and it will say if it is a gas,solid or liquid and it might say if it is man made!

Explanation:

i really hope this helps:)

Endothermic and exothermic reactions are two types of chemical reactions that differ in terms of the heat energy involved and the direction of heat flow.

Endothermic reactions absorb heat energy from the surroundings, resulting in a decrease in temperature. These reactions have a positive change in enthalpy (ΔH), meaning that the products have higher energy than the reactants. An example of an endothermic reaction is the process of photosynthesis, where plants absorb energy from sunlight to convert carbon dioxide and water into glucose and oxygen.Exothermic reactions release heat energy into the surroundings, leading to an increase in temperature. These reactions have a negative change in enthalpy (ΔH), indicating that the products have lower energy than the reactants. Combustion reactions, such as burning wood or fuel, are common examples of exothermic reactions.Enthalpy (H) is a thermodynamic quantity that represents the total heat content of a system. It includes both the internal energy of a system and the work done by or on the system. In the context of chemical reactions, the enthalpy change (ΔH) represents the heat energy exchanged during the reaction. For endothermic reactions, ΔH is positive, while for exothermic reactions, ΔH is negative.The rate of a chemical reaction is closely related to the frequency and effectiveness of particle collisions. The collision theory states that for a reaction to occur, particles must collide with sufficient energy and proper orientation.

Particle collisions play a crucial role in chemical reactions because they bring reactant molecules into close proximity, allowing them to interact and form new products. When particles collide, their kinetic energy determines whether the collision will result in a successful reaction. If the collision has sufficient energy (equal to or greater than the activation energy), and the particles are correctly oriented, they can overcome the energy barrier and undergo a chemical transformation.The collision theory helps explain factors that influence reaction rates, such as temperature, concentration, and catalysts. Increasing the temperature provides particles with more kinetic energy, leading to a higher collision frequency and increased reaction rate. Similarly, higher reactant concentrations increase the likelihood of collisions and, consequently, the reaction rate. Catalysts work by providing an alternative reaction pathway with lower activation energy, enabling more successful collisions and accelerating the reaction.Understanding the collision theory is essential for predicting and controlling reaction rates, optimizing reaction conditions, and designing efficient chemical processes.

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The new pressure of the gas is approximately 838.74 torr.

To determine the new pressure of the gas, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional when the temperature remains constant.

According to Boyle's Law, P1 * V1 = P2 * V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

Given:

Initial volume (V1) = 516 ml

Initial pressure (P1) = 345 torr

Final volume (V2) = 213 ml

Using the formula and plugging in the values:

345 torr * 516 ml = P2 * 213 ml

Simplifying the equation:

P2 = (345 torr * 516 ml) / 213 ml

Calculating the value:

P2 ≈ 838.74 torr

Therefore, the gas now has a pressure of approximately 838.74 torr.

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Answer:

The elements in this family are fluorine, chlorine, bromine, iodine, and astatine. Halogens have 7 valence electrons, which explains why they are the most active non-metals.

Explanation:

Answer:

Selenium

Explanation:

Answer:

7.28 mol Na2SO4

Explanation:

Since it is already in moles, all we have to do is use a molar ratio

A molar ratio is the proportions of reactants and products using the balanced equation. When writing a mole ratio, the given information must cross out with the right thing.

7.28 mol H2SO4 * 1 mol Na2SO4/1 H2SO4 = 7.28 mol Na2SO4

*notice how the H2SO4 crosses out

Producing more eggs is the trait which is most  likely achieved in hens through selective breeding.

The technique by which humans regulate the breeding biological organisms throughout order to show or erase a certain attribute is known as selective breeding. Artificial selection is used in selective breeding to control the genetic transmission of desirable features.

Humans have selectively bred animals for many years. Selective breeding helps to produce favored traits in the animals. One example of animals that are selectively bred is hens. They produce more eggs and do so more quickly than the normal chicken.

Therefore, producing more eggs is the trait which is most  likely achieved in hens through selective breeding.

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Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.

The correct answer is D. 100 mL × 1g divided by 1mL × 1mol divided by 18.02g × 4.186 kJ/mol = 23.2 kJ

To calculate the energy required to boil 100 mL of water, we need to use the specific heat capacity of water, which is approximately 4.186 J/g·°C. The molar mass of water is 18.02 g/mol.

First, we convert the volume of water from milliliters to grams:

100 mL × 1 g/1 mL = 100 g

Then, we calculate the number of moles of water:

100 g × 1 mol/18.02 g = 5.548 mol

Finally, we multiply the number of moles by the molar heat of vaporization of water, which is approximately 40.65 kJ/mol:

5.548 mol × 4.186 kJ/mol = 23.2 kJ

Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.

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Answer:

(2-)

Explanation:

the compounds 0(2-) is the stable

Each gram of hemoglobin carries approximately 3.015 milliliters of oxygen.

To calculate the number of milliliters of oxygen that each gram of hemoglobin carries, we can use the given information.

We know that 10.0 mL of blood can carry 2.01 mL of oxygen. So, we can set up a proportion:

(10.0 mL blood) / (2.01 mL oxygen) = (15 g hemoglobin) / (x mL oxygen)

Cross-multiplying, we get:

10.0 mL blood * x mL oxygen = 2.01 mL oxygen * 15 g hemoglobin

Simplifying, we have:

10.0x = 30.15

Dividing both sides by 10.0, we find:

x = 3.015 mL/g

Therefore, each gram of hemoglobin carries approximately 3.015 milliliters of oxygen.

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Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:

mass  = moles × molar mass

moles = atoms ÷ Avogadro's Number

         ⇒    mass = (atoms ÷ Avogadro's Number) ×  molar mass

 mass = [(100 atoms) ÷ (6.022 × 10²³ atoms/mole)] × (12.011 g/mol)    

           = 1.99 × 10⁻²¹ g

           ≈ 2e-21         [to 1 sig fig]

The molality of dichloromethane in this solution is 6.25 m.

The molality of dichloromethane in a solution of dichloromethane and 2-pentanone is calculated using the formula:

molality (m) = moles of solute (mol) / kilograms of solvent (kg)

In this case, the solute is dichloromethane (CH₂Cl₂) and the solvent is 2-pentanone (CH₃COC₃H₇). The mole fraction of dichloromethane is 0.350, so there are 0.350 moles of dichloromethane in one mole of the solution.

To get the mass of solvent, we need to convert the number of its moles to mass by multiplying it with its molar mass. The molar mass of 2-pentanone (CH₃COC₃H₇), is the sum of the atomic weights of each element, which is 86.13 g/mol. One mole of the solution contains 0.350 moles of dichloromethane and 0.650 moles 2-pentanone. Therefore, the mass of 2-pentanone is:

mass = moles x molar mass = 0.650 moles x 86.13 g/mol = 55.9845 g

Solving for the molality, we get:

m = 0.350 moles / (5.9845 g)(1 kg/1000g)

m = 6.25 mol/kg = 6.25 m

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The amount of the energy is required to the break the bonds in the ethanol is the 3219 kJ/mol.

The chemical equation is as :

C₂H5OH (1)+3O₂ (g) → 2 CO₂ (g) + 3 H₂O (g)

The standard bond energies are :

The bond energy, C-H= 410 kJ/mol

The bond energy, O-H=463 kJ/mol

The bond energy, C-O = 358 kJ/mol

The bond energy, C-C= 348 kJ/mol

The energy to break the ethanol, C₂H5OH is as :

5 C - H bond = 5 × 410 = 2050 kJ/mol

1 C - C bond = 348 kJ/mol

1 C - O bond = 358 kJ/mol

1 O - H bond = 463 kJ/mol

The energy = 2050 kJ/mol + 348 kJ/mol + 358 kJ/mol  + 463 kJ/mol

The energy = 3219 kJ/mol

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When solid magnesium chloride (MgCl2) is put into water (H2O), it dissociates into its constituent ions. The reaction can be represented as follows:

MgCl2(s) + H2O(l) → Mg2+(aq) + 2Cl-(aq)

In this reaction, the magnesium chloride compound breaks down into magnesium ions (Mg2+) and chloride ions (Cl-) when it comes into contact with water. The water molecules surround and solvate the individual ions, allowing them to move freely in the solution. This dissociation of magnesium chloride in water results in the formation of an aqueous solution containing magnesium ions and chloride ions, which are responsible for the compound's ability to conduct electricity, indicating it is a strong electrolyte.

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Answer:

The phenotypic percentage of having yellow or green seeds is 50% for having either of the two colours

Explanation:

The crossing to determine the offsprings is shown in the image attached where we have two green (Yy) seeds and two yellow (yy) seeds as offsprings.

Thus, the phenotypic percentage of having yellow or green seeds is 50% for having either of the two colours.

Note, the dominant allele is "Y" while the recessive allele is "y". Thus, Yy would produce a yellow colour while yy would produce a green colour (as both mentioned in the question).

Also note that phenotype describes the outward properties/characteristics of an individual.

The concentration of AB at 21 s is 0.526 M.

The data below show the concentration of AB versus time for the following reaction:

AB(g)→A(g)+B(g)Time (s)  [AB] (M)0  0.95050  0.459100  0.302150  0.225200  0.180250  0.149300  0.128350  0.112400  0.0994450  0.0894500  0.0812

Determine the value of the rate constant:

The reaction is a first-order reaction. The concentration of AB changes as follows:

[AB]t = [AB]0e^-ktln

([AB]t/[AB]0) = -ktln

(0.459/0.950) = -k(

0.693)k = 1.88 × 10^-3 s^-1

The rate constant value is 1.88 × 10^-3 s^-1.

Predict the concentration of AB at 21 s.

The formula for a first-order reaction is given by ln

([A]t/[A]0) = -ktln([AB]t

[AB]0) = -kt[AB]t = [AB]0 e^-kt

[AB]t = (0.950) e^-(1.88 × 10^-3)(21)[AB]t = 0.526 M.

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A reference value is provided by the control, which can then be compared to the samples in which the value of a variable was altered.

This is further explained below.

Generally, Control is a management function that aids in mistake detection and the implementation of remedial measures.

This is done to reduce departure from standards and make that the organization's stated objectives are met in the desired way.

In conclusion, The control offers a standard against which samples with varying changes may be measured.

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Answer:

I believe it would be 2

Explanation:

if there are 2 nitrogen molecules then there would have to be 2 hydrogen molecules but this could be completely wrong

if this happens to be right, ur welcome :3 here's a Jay Jay pic for u cuz why not

Answer:

Anwer is A  0.60

Explanation:

If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

The decay of the radioactive substance follows an exponential decay equation of the form:

\(N(t) = N_{o} \times e^{-kt}\)

Where:

N(t) is the amount of substance remaining at time t

N₀ is the initial amount of substance

k is the decay constant

t is the time elapsed

Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.

\(85 = 170 \times e^{-k \times 16}\)

Dividing both sides by 170:

\(0.5 = e^{-k \times 16}\)

To solve for k, we can take the natural logarithm (ln) of both sides:

ln(0.5) = -k × 16

from this, the value of k comes out to be:

k = 0.0431

Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):

\(N(21) = 170 \times e^{-0.0431 \times 21}\)

Calculating this expression:

N(21) = 75.2

Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

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The statement you provided is correct. In a mixture of gases, each gas exerts its own partial pressure independently of other gases present.

This is known as Dalton's Law of Partial Pressures. Additionally, in a closed system, pressure and volume have an inverse relationship, as described by Boyle's Law.

In a mixture of gases, each gas exerts its own partial pressure: This is known as Dalton's law of partial pressures. According to this law, in a mixture of gases, the total pressure is the sum of the partial pressures of each individual gas in the mixture.

In a closed system, pressure and volume have an inverse relationship: This is known as Boyle's law. According to this law, when the temperature of a gas is held constant, the pressure and volume of the gas are inversely proportional.

The amount of gas that will dissolve in a fluid is determined by the solubility of the gas in the given fluid: This is known as Henry's law. According to this law, the amount of gas that dissolves in a liquid at a given temperature is directly proportional to the partial pressure of the gas above the liquid.  

Lastly, the amount of gas that dissolves in a fluid depends on the solubility of the gas in that particular fluid.

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Answer: hehe its kirishima here and the various types of fossil fuels are energy provision coal, oil and natural gas. Coal is a solid fossil fuel formed over millions of years by decay of land vegetation.

haha hope this helped

-yours truly red riot

Yes, to calculate the mass percent of the solution, you need to convert the volume of the solution to grams by multiplying it by the density. The reason for this is that the mass percent represents the ratio of the mass of the solute (in this case, NaCl) to the total mass of the solution.

The given density of the solution is 1.06 g/mL. By multiplying the volume of the solution, which is 875 mL, by the density, you will obtain the mass of the solution in grams. This conversion is necessary to ensure that you are comparing the mass of the solute (NaCl) to the total mass of the solution.

Once you have the mass of the solution, you can then calculate the mass of NaCl by subtracting the mass of the solvent (water) from the total mass. Finally, the mass percent of the solution is calculated by dividing the mass of NaCl by the total mass of the solution and multiplying by 100.

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Considering the definition of speed, it takes 1 hour to travel a distance of 44 misle.

Speed can be defined as the amount of space traveled per unit of time with which a body moves. That is, speed ​​is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.

The speed can be calculated using the expression:

speed= distance traveled÷ time

In this case, you know that:

Replacing in the definition of speed:

44 miles per hour= 44 miles÷ time

Solving:

44 miles per hour× time= 44 miles

time= 44 miles÷ 44 miles per hour

time= 1 h

In summary, it takes 1 hour to travel a distance of 44 miles.

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The total number of moles NH3 is 1.00 mole, under the condition that the reaction is of 14. 0 g N2.

The given balanced chemical equation for the reaction of nitrogen gas (N2) and hydrogen gas (H2) to form ammonia gas (NH₃) is
N₂(g) + 3H₂(g) → 2NH₃(g)

The molar mass of N₂ is 28.01 g/mol. To evaluate the number of moles of N₂ in 14.0 g of N₂ we divide the mass by the molar mass
Number of moles of N₂ = Mass of N₂ / Molar mass of N₂
Number of moles of N₂ = 14.0 g / 28.01 g/mol
Number of moles of N₂ = 0.4998 mol

Then, the number of moles of NH3 that would form from the complete reaction of 14.0 g N2 can be evaluated
Number of moles of NH₃ = Number of moles of N₂ × (2 moles NH₃ / 1 mole N₂)
Number of moles of NH₃ = 0.4998 mol × (2 mol NH₃ / 1 mol N₂)
Number of moles of NH₃ = 0.9996 mol

Hence, approximately 1.00 mole of NH₃ would form from the complete reaction of 14.0 g N₂.

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Answer:

Speed

Explanation:

Because That's how fast the Car is traveling.

Answer:

In terms of heat transfer,radiation is the emission of thermal energy in the form of infrared waves,

The Option C is correct precipitation is concentrated in the season

Hope it help

Answer:

C) precipitation is concentrated in one season

Explanation:

edge 2020