the pKa of diphenylhydrazine is ?

Answer:98

Explanation:X/423 = 75.0/323 X = 98

Considering the Charles' Law, the original volume is 98.22 mL.

Charles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.

This law states that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of movement that they have. the gas molecules. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law states that the ratio between volume and temperature will always have the same value:

\(\frac{V}{T}=k\)

Considering an initial state 1 and a final state 2, the following is true:

\(\frac{V1}{T1}=\frac{V2}{T2}\)

In this case, you know:

Replacing in Charles's law:

\(\frac{V1}{423 K}=\frac{75 mL}{323 K}\)

Solving:

\(V1=\frac{75 mL}{323 K}423 K\)

V1= 98.22 mL

In summary, the original volume is 98.22 mL.

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Answer:

Sorry I don't know.

Explanation:

I'm only in middle school.

The polynomial that represents the surface area of 10 congruent prisms is 20b^2 + 40bh.

The polynomial that represents the surface area of 10 congruent prisms with base length "b" and height "h" can be obtained by multiplying 2b^2 + 4bh by 10:

10(2b^2 + 4bh)

To find the surface area of 10 prisms with a base length of 4 inches and a height of 5 inches, we can substitute "b" with 4 and "h" with 5 in the polynomial 20b^2 + 40bh:

Surface area = 20(4^2) + 40(4)(5)

Surface area = 20(16) + 40(20)

Surface area = 320 + 800

Surface area = 1120 square inches

So, the surface area of 10 prisms with a base length of 4 inches and a height of 5 inches is 1120 square inches.

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approximately 34,993 Joules of heat are required to raise the temperature of 83.5 g of water from its melting point to its boiling point.

To calculate the heat required to raise the temperature of a substance, you need to consider the specific heat capacity of the substance and the temperature change.

For water, the specific heat capacity is approximately 4.18 J/g°C.

Given:

Mass of water = 83.5 g

Temperature change = (boiling point of water) - (melting point of water)

The boiling point of water is 100°C, and the melting point of water is 0°C.

Temperature change = 100°C - 0°C = 100°C

Now, we can calculate the heat using the formula:

Heat = mass × specific heat capacity × temperature change

Heat = 83.5 g × 4.18 J/g°C × 100°C

Heat ≈ 34,993 J

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Answer:

C

Explanation:

Answer:

A cell's plasma membrane, also known as the cell membrane, provides protection. It also maintains a constant atmosphere within the cell, and the membrane serves a variety of purposes. The first is to transport nutrients into the cell, and the second is to transport toxic compounds out

Explanation:

Answer:

12 atoms

but u said there are 10 pts but only 5 are there

Answer:

\(6.02 \times {10}^{24} \: atoms\)

Step-by-step explanation:

Number of atoms of Al = Number of moles of Al × Avogadro constant

\( = 4 \times 6.02 \times 10 ^{23} \)

\( = 2.408 \times 10 ^{24} \: atoms\)

Number of atoms of O = Number of moles of O × Avogadro constant

\( = 6 \times 6.02 \times {10}^{23} \)

\( = 3.612 \times 10 ^{24} \: atoms\)

Total number of atoms

\( = 2.408 \times {10}^{24 } + 3.612 \times {10}^{24} \)

\( = 6.02 \times {10}^{24} atoms\)

Answer:

the quantity of solution to moles for d is significantly lower.

Explanation:

the larger the amount of liquid, the less amount of ions to dissociate hence having a lesser amount of chloride ions.

compared to b which is less liquid and a higher concentration

Solution B (MgCl₂) has a molarity of 0.20 mol/dm³ and a volume of 60 cm³.

Option (B) is correct.

First, we need to convert the volume from cubic centimeters (cm³) to cubic decimeters (dm³) because the molarity is given in moles per cubic decimeter (mol/dm³). There are 1000 cm³ in 1 dm³, so:

Volume = 60 cm³ × (1 dm³ / 1000 cm³) = 0.060 dm³

Now we can calculate the moles of chloride ions in solution B:

Moles = Molarity × Volume = 0.20 mol/dm³ × 0.060 dm³ = 0.012 moles

None of the other options have both a high molarity and a high volume to yield a higher amount of chloride ions. Option A has a higher molarity but a smaller volume, option C has a higher volume but a smaller molarity, and option D doesn't have a high molarity or volume for chloride ions.

Therefore, among the given options, solution B (MgCl₂) contains the largest amount of chloride ions, which is 0.012 moles.

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The complete question is:

Which solution contains the biggest amount, in mol, of chloride?

A. 20 cm³ of 0.50 mol dm⁻³NH,CL

B. 60 cm³ of 0.20 mol dm⁻³ MgCl₂

C. 70 cm³ of 0 30 mol dm⁻³ NaCl

D. 100 cm³ of 0.30 mol dm⁻³ CICH₂ COOH

The molecular formula for the compound is \(N_{2}H_{4}\).

The empirical formula gives you the simplest whole-number ratio of atoms in a molecule or compound. The molecular formula gives you the actual number of atoms of each element in a molecule or compound.

To determine the molecular formula of a compound with the empirical formula  \(NH_{2}\) and a molar mass of 32.05 g/mol, follow these steps:

1. Calculate the molar mass of the empirical formula  \(NH_{2}\):
  - Molar mass of Nitrogen (N) = 14.01 g/mol
  - Molar mass of Hydrogen (H) = 1.01 g/mol
  - Molar mass of  \(NH_{2}\) = (1 x 14.01) + (2 x 1.01) = 16.03 g/mol

2. Divide the given molar mass (32.05 g/mol) by the molar mass of the empirical formula (16.03 g/mol):
  - Ratio = 32.05 g/mol / 16.03 g/mol ≈ 2

3. Multiply the empirical formula by the ratio to get the molecular formula:
  - Molecular formula = \(NH_{2}\) * 2 = \(N_{2}H_{4}\).

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Answer:

B. single-replacement

Explanation:

Answer:

a

Explanation:

Jaleh's velocity for the entire trip is 0.4 m/s as It takes her 500 seconds to make the round trip. Path 1 = 400 m В B. A Path 2 = 200 m Path 3 = 300 m. Thus, option C is correct.

A particle's settling velocity known as the rate at which is travels through a still fluid. The specific gravity of the particles, their size, and their shape all have an impact on settling velocity.

A particle in still air will gravitationally settle and reach its terminal velocity fairly quickly. A particle's terminal velocity in a still fluid is referred to as the settling velocity (also known as the "sedimentation velocity").

Understanding variations in the hydraulic regime and interactions between sediment and fluid in the surf zone depends heavily on the particle settling velocity at the foreshore region. In contrast to sedimentation, which is the end product of the settling process, settling is the movement of suspended particles through the liquid.

Therefore, Thus, option C is correct.

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For an FCC crystal: calculate the density of atoms (atoms/a² where a is the lattice constant) for the (100), (110) and (111) planesThe unit cell of a FCC crystal is shown below:Here, each corner atom contributes 1 atom, and each face atom contributes 1/2 atoms.

For (100) plane:Length of unit cell along (100) plane direction = a Density of atoms = No. of atoms / Area of the plane Area of the plane = a²Density of atoms for (100) plane = 4 / a²For (110) plane:Length of unit cell along (110) plane direction = a√2Density of atoms = No. of atoms / Area of the plane Area of the plane = a x a√2Density of atoms for (110) plane = 2 x 2 / (a x a√2) = 4√2 / a²

For (111) plane:Length of unit cell along (111) plane direction = a√3Density of atoms = No. of atoms / Area of the plane Area of the plane = a²√3/2 Density of atoms for (111) plane = 3 x 4 / (a²√3) = 4√3 / a²Hence, the density of atoms for the (100), (110) and (111) planes in an FCC crystal are as follows:For (100) plane: 4 / a²For (110) plane: 4√2 / a²For (111) plane: 4√3 / a².

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Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Homogeneous and heterogeneous mixture in colloid, suspension and solution

A colloid is a heterogeneous mixture in which the dispersed particles are intermediate in size between those of a solution and a suspension and within the categories of homogeneous and heterogeneous mixtures there are more specific types of mixtures including solutions is alloys, suspensions, and colloids and a solution is a mixture where one of the substances dissolves in the other and the substance that dissolves is called the solute

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Answer: Group 14

Explanation:

It's a carbon atom with 4 valance electrons.

The heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

The amount of heat required to increase the temperature of one gram of a material by one degree Celsius (°C) is defined as specific heat.

The equation q = mcΔt can be used to compute the amount of heat acquired or lost by a specific heat (q), where m is the mass of the sample, c is the specific heat, and Δt is the temperature change.

Given:

m = 8.75

c = 4.186 J/g°C

The melting point and boiling point of water is 0° and 100° respectively.

Δt = 100° - 0° = 100°

We know that,

q = mcΔt

  = 8.75(4.186)100

  = 3.662 kJ

Thus, the heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

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When recrystallizing a solid, the amount of hot solvent required to dissolve the compound depends on various factors such as the solubility of the compound and the desired concentration.

Generally, you should use just enough hot solvent to dissolve the compound completely. This typically ranges from the minimum amount required to dissolve the compound to a little less than that.

It is important to note that adding too much solvent can lead to lower yields and impurities in the recrystallized solid.

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C. Continuous metabolic production of free hydrogen ions

The processes of creating and breaking down glucose molecules are both examples of metabolic pathways. A metabolic pathway is a chain of related chemical reactions that feed each other. The pathway takes in a single or extra beginning molecule and, through a sequence of intermediates, converts them into merchandise.

Metabolism (stated: meh-TAB-uh-Liz-um) is the chemical reactions within the body's cells that alternate meals into power. Our bodies want this strength to do the entirety from moving to wondering to growing. particular proteins in the body manipulate the chemical reactions of metabolism.

A metabolic product is a compound produced via the cells and is excreted to the extracellular medium. it can be produced in the number one metabolism, e.g. carbon dioxide, ethanol, acetate, or lactate, or an extra complicated one, e.g. a secondary metabolite or a heterologous protein secreted to the extracellular medium.

The question is incomplete. Please read below to find the missing content.

Which normal physiologic process contributes most to the need for acid-base balance

A. Continuous organ production of bicarbonate from carbonic acid

B. Continuous alveolar exchange of oxygen and carbon dioxide

C. Continuous metabolic production of free hydrogen ions

D. Continuous kidney formation of urine from blood

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The order of the  components involved in electron transport from those with the lowest redox potential to the highest Electron Transport Components are : NADH/NAD⁺ , NADH dehydrogenase complex ,  Cytochrome c reductase, cytochrome c oxidase, H₂O/O₂.

The  intermediate that is cytochromes and the other carriers having their intermediate of the redox potentials are arranged in the series which is the electron transport from the NADH  or the FADH to the O₂. The electron transport starts from the carriers that have the low redox potential to the one  having the high redox potential.

The electron transport of down the energy gradient through which the electron transport system that leads to the formation of the ATP from the ADP and the inorganic phosphate. This production of the  ATP is called as the oxidative phosphorylation.

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In glycolysis, ATP is consumed in the reaction producing compound is adenosine diphosphate (ADP)

Glycolysis is the initial stage of cellular respiration in which glucose is broken down into pyruvate. In the cytoplasm of the cell, this process happens. Two molecules of ATP are used in glycolysis, and four are produced. The product of glycolysis is pyruvate, which can enter either anaerobic or aerobic cellular respiration.

Adenosine triphosphate (ATP) is a type of nucleotide that is made up of adenine, ribose, and three phosphate groups. ATP is a universal energy currency in organisms that use oxygen, storing and delivering energy for cellular processes. During cellular respiration, ATP is synthesized and consumed repeatedly. ATP is produced in the later stages of cellular respiration, including oxidative phosphorylation and chemiosmosis.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

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Answer:

ok

Explanation:

Answer:

Iron

Explanation:

Answer:

86.96

Explanation:

Answer:

Help your self

Explanation:

The correct electron configuration for bismuth is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p³. Option 2.

Bismuth has an atomic number of 83, and hence, has 83 electrons.

According to the Aufbau principle, electrons fill up orbitals in order of increasing energy levels; s, p, d, and f with a maximum electron of 2, 6, 10, and 14 respectively.

The electron configuration for bismuth can be written by following this principle, starting from the first energy level and moving up to the sixth energy level.

Therefore, the electron configuration for bismuth is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p³.

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Explanation:

Covalent bonds can be classified based on the number of bonds between atoms into three categories:

1. Single Covalent Bond: In a single covalent bond, two atoms share one pair of electrons. This is the most common type of covalent bond. For example, in H2O, each hydrogen atom forms a single covalent bond with the oxygen atom.

2. Double Covalent Bond: In a double covalent bond, two atoms share two pairs of electrons. This bond is stronger than a single covalent bond. For example, in O2, the oxygen atoms are connected by a double covalent bond.

3. Triple Covalent Bond: In a triple covalent bond, two atoms share three pairs of electrons. This bond is the strongest among the three types. For example, in N2, the nitrogen atoms are connected by a triple covalent bond.

It is important to note that the number of bonds between atoms is determined by the number of electrons they need to achieve a stable electron configuration, which varies depending on the elements involved.

The covalent bond is classified mainly into three types

single, double and triple bonds.

Covalent bond is a bond formed between two atoms through the sharing of two electrons between them.  The atoms will share more than one electron pairs if the valency is not satisfied.  the three types of covalent bond are single bond, double bond and triple bond.

single bond is formed when one pair of electrons are shared between atoms, while if two pairs or three pairs are shared, it is called double or triple bond respectively. Covalent compounds are those which contains covalent bonding.

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Answer:

Triads were groups of 3 elements with similar chemical and physical properties. Beryllium, magnesium, and calcium are all earth alkalis found in the earth

Explanation: