What is the oxidation number for phosphorus in PF3 compound? QUESTION 20 What is being oxidized in the following reaction? 2H2 + O2 --> 2H20 O A. H2 B. Not enough information OC.H2O D.O2

Answer:

Pulling back on the plunger allows you to put in more air into the pump and the more air you have inside a fixed volume, the greater the pressure becomes. (D)

The cloth is approximately 1,813 years old. The answer is C) 1,813 years.

The half-life of carbon-14 is 5,730 years, which means that after 5,730 years, half of the carbon-14 in a sample will have decayed. If the carbon-14 composition of the cotton cloth is 22 percent that of living plants, then it has undergone several half-lives of decay.
To calculate the age of the cloth, we can use the formula for exponential decay:
N = N0 e^(-λt)
where N is the amount of carbon-14 remaining in the cloth, N0 is the initial amount of carbon-14, λ is the decay constant (which is related to the half-life), and t is the time elapsed since the cloth was last in contact with the atmosphere.
Let's assume that the initial amount of carbon-14 in the cloth was the same as that in living plants, and that the amount of carbon-14 remaining in the cloth is 22 percent of that initial amount. In other words, N/N0 = 0.22.
Substituting into the formula and solving for t, we get:
0.22 = e^(-λt)
ln(0.22) = -λt
t = ln(0.22) / (-λ)
We can calculate the decay constant λ using the half-life:
λ = ln(2) / half-life = ln(2) / 5,730 = 1.21 × 10^-4 years^-1
Substituting this into the equation for t, we get:
t = ln(0.22) / (-1.21 × 10^-4) ≈ 1,813 years
Therefore, the cloth is approximately 1,813 years old. The answer is C) 1,813 years.

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Answer:

Explanation:

As

Molar mass of NaCl= 58.44 gm

So we got it that,

58.44 mass of NaCl contain = 6.023*10^23  molecules of Na Cl

x mass will contain = 6.78*10^50

by cross multiplication , we get

x=  58.44*(6.78*10^50)/  6.023*10^23  

x= 65.785 * 10^27  molecules

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Answer:

6) 225.8 g

7) 1.01 g

8) 21.624 g

Explanation:

6) Molar Mass of Lithium Bromine: 86.845

86.845 * 2.6 = 225.8 g

7) Molar Mass of Neon: 20.180

20.180 * 0.05 = 1.01 g

8) Molar Mass of Water Vapor: 18.02

18.02 * 1.2 = 21.624 g

Answer:

0.18 mol C₃H₈

Explanation:

to find the mole you have to convert the 8.0grams into moles.

8.0g C₃H₈        1 mol C₃H₈

       1               44.0g C₃H₈

*Pretend that those are a table*

I got 44.0g because Carbon is 12.0g you multiply that 3 times because it has a subscript of 3 and do the same for Hydrogen (1.0 x 8) then add those which would be 44.0g.

1 mol of C₃H₈ = 44.0g C₃H₈

now just mulitply and divide them.

8.0g x 1 = 8.0

1 x 44.0g = 44.0

8.0/44.0 = 0.18 mol C₃H₈

The mass defect of one atom of 108In is 0.7777 amu.

To calculate the mass defect of an atom, we need to find the difference between the actual mass of the atom and the sum of the masses of its individual particles (protons, neutrons, and electrons) using Einstein's famous equation E=mc².

The mass of the atom of 108In is given as 107.909678 amu. The sum of the masses of its individual particles (protons and neutrons) can be calculated as follows:

mass of 108In nucleus = (107 protons x 1.00728 amu/proton) + (108 - 107 neutrons x 1.00867 amu/neutron)

= 107.13196 amu

Now, using Einstein's equation E=mc², we can find the energy equivalent of the mass defect (∆m) by multiplying the mass defect by the speed of light squared (c²):

∆E = ∆m c²

Since the units of mass and energy are related by c², we can convert the energy into units of mass (amu) by dividing by c²:

∆m = ∆E/c²

Using the values for the mass of the atom and the sum of the masses of its individual particles, we can calculate the mass defect (∆m) as:

∆m = (107.13196 - 107.909678) amu = -0.777718 amu

Therefore, the mass defect of one atom of 108In is 0.7777 amu. Note that the mass defect is negative because the actual mass of the atom is less than the sum of the masses of its individual particles, due to the binding energy that holds the nucleus together.

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Answer:

formation of zinc sulphate which is soluble

Answer:I’m not for sure

Explanation:

In conclusion, when cyanide and water react in a proton transfer reaction, hydrogen cyanide and hydroxide are formed. One of the atoms involved in this reaction does not have a properly depicted valence.

Cyanide and water react in a proton transfer reaction to form hydrogen cyanide and hydroxide.

In this reaction, one of the atoms involved does not have a properly depicted valence.

To understand the reaction, let's break it down step-by-step:

1. The cyanide molecule (CN-) reacts with a water molecule (H2O).
2. In the reaction, a proton (H+) is transferred from the water molecule to the cyanide ion.
3. As a result, a hydrogen cyanide molecule (HCN) and a hydroxide ion (OH-) are formed.

It is important to note that one of the atoms in this reaction does not have a properly depicted valence.

This means that the atom may not have the correct number of valence electrons or may not be showing the correct valence state.

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Provide a few solutions and explain why they should be effective. Make a succinct conclusion. Provide a succinct summary of what you wrote. A good response.

What might a solution look like?

A good example of a solution is a mixture of salt and sugar. Any solution can be broken down into different parts. Solid, liquid, and gaseous solutions can be classified as solutions based on the physical states of the solvent and solute. Both the solute and the solvent have a solid in solid solutions. For instance, mixtures of polymer and ceramic.

What various categories of water-based solutions are there?

1. Depending on whether the solution contains water or not, different kinds of solutions on water as a solvent can be divided into two categories. the mixture in which freshwater acts as just a solvent and any state of homogenous component totally dissolves in it.

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The total energy required to change 10 grams of ice at zero degrees Celsius to steam at 100 degrees Celsius is 800 + 1000 + 5400 = 7200 calories.

To change 10 grams of ice at zero degrees Celsius to steam at 100 degrees Celsius, we need to calculate the energy required to melt the ice, heat the resulting water to its boiling point, and then convert it into steam.

First, we need to calculate the energy required to melt the ice, which can be done using the latent heat of fusion of H2O, which is 80 cal/g. So, the energy required to melt 10 grams of ice would be 10 grams * 80 cal/g = 800 calories. Next, we need to heat the resulting water to its boiling point. The specific heat of water is 1 cal/g, and we need to raise the temperature of 10 grams of water from 0 degrees Celsius to 100 degrees Celsius, so the energy required would be 10 grams * 100 degrees Celsius * 1 cal/g = 1000 calories. Finally, we need to convert the water into steam, which requires the latent heat of vaporization of H2O, which is 540 cal/g. So, the energy required would be 10 grams * 540 cal/g = 5400 calories.

Therefore, the total energy required to change 10 grams of ice at zero degrees Celsius to steam at 100 degrees Celsius is 800 + 1000 + 5400 = 7200 calories.

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Diluting 100.0 ml of an 8.0 M sugar water solution to a total volume of 600.0 ml results in a final molarity of approximately 1.33 M.

To calculate the molarity of the resulting sugar water solution after dilution, we can use the formula:

M1V1 = M2V2

where M1 and V1 represent the initial molarity and volume, and M2 and V2 represent the final molarity and volume.

In this case, the initial volume (V1) is 100.0 ml, and the initial molarity (M1) is 8.0 M. The final volume (V2) is 600.0 ml, and we need to determine the final molarity (M2).

Rearranging the equation, we have:

M2 = (M1 * V1) / V2

Plugging in the values, we get:

M2 = (8.0 M * 100.0 ml) / 600.0 ml

Simplifying the equation, we find:

M2 ≈ 1.33 M

Therefore, the resulting molarity of the sugar water solution after diluting 100.0 ml of an 8.0 M solution to a total volume of 600.0 ml is approximately 1.33 M.

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Answer:0

Explanation:

Therefore, the estimated energies of a proton in a 5.0 fm long box are approximately:

E1 = 1.808 x 10^-13 J

E2 = 7.234 x 10^-13 J

E3 = 1.631 x 10^-12 J

The allowed energies of a particle in a one-dimensional box are given by:

E = (n^2 * h^2) / (8 * m * L^2)

Where:

E is the energy of the particle

n is the quantum number (1, 2, 3, ...)

h is the Planck's constant (approximately 6.626 x 10^-34 J*s)

m is the mass of the particle (mass of a proton = 1.673 x 10^-27 kg)

L is the length of the box (5.0 fm = 5.0 x 10^-15 m)

For n = 1:

E1 = (1^2 * (6.626 x 10^-34 J*s)^2) / (8 * (1.673 x 10^-27 kg) * (5.0 x 10^-15 m)^2)

For n = 2:

E2 = (2^2 * (6.626 x 10^-34 J*s)^2) / (8 * (1.673 x 10^-27 kg) * (5.0 x 10^-15 m)^2)

For n = 3:

E3 = (3^2 * (6.626 x 10^-34 J*s)^2) / (8 * (1.673 x 10^-27 kg) * (5.0 x 10^-15 m)^2)

Now we can calculate the values:

E1 ≈ 1.808 x 10^-13 J

E2 ≈ 7.234 x 10^-13 J

E3 ≈ 1.631 x 10^-12 J

Therefore, the estimated energies of a proton in a 5.0 fm long box are approximately:

E1 = 1.808 x 10^-13 J

E2 = 7.234 x 10^-13 J

E3 = 1.631 x 10^-12 J

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A table comparing the important parameters of the two engine designs is shown below:ParametersDesign 1Design 2Compression Ratio 18:118:1Φ (Equivalence Ratio)0.75 (Richer)0.65 (Leaner)EGR Level 10%15%Intake Temperature 80°C100°C Intake Pressure 1 bar0.5 bar Intake Valve Closing −15 deg BTDC−25 deg BTDC.

The compression ratio is the ratio of the volume of the combustion chamber from its largest capacity to its smallest capacity. The compression ratio in Design 1 is 18:1, while in Design 2, it is 18:1. The higher compression ratio is seen in Design 1, which will lead to a higher engine efficiency since more fuel energy is converted into useful work.

The Φ (equivalence ratio) is the ratio of the actual air/fuel ratio to the stoichiometric air/fuel ratio. A Φ value of 1.0 indicates a stoichiometric mixture, whereas values less than 1.0 indicate a lean mixture and values greater than 1.0 indicate a rich mixture. The Equivalence ratio in Design 1 is 0.75, which means it is running rich, while in Design 2, it is 0.65, which means it is running lean.

The design 2 engine has a higher Φ (equivalence ratio) level, which may lead to lower NOx emissions due to lean-burn combustion.The EGR (Exhaust Gas Recirculation) level in Design 1 is 10%, whereas in Design 2, it is 15%. The EGR level in Design 2 is higher than that in Design 1, which can help to reduce NOx emissions by lowering the temperature of combustion.

Intake temperature is 80°C in Design 1, whereas in Design 2, it is 100°C. The higher intake temperature in Design 2 means that the engine will have a higher thermal efficiency due to the increased Carnot efficiency.Intake pressure is 1 bar in Design 1, while in Design 2, it is 0.5 bar. The higher intake pressure in Design 1 results in more air being compressed into the combustion chamber, allowing for more fuel to be burned and greater efficiency.

Intake Valve Closing (IVC) is −15 deg BTDC in Design 1 and −25 deg BTDC in Design 2. The IVC timing is responsible for trapping the charge in the combustion chamber and influencing the engine's breathing. The lower IVC timing in Design 2 provides less resistance to flow, resulting in greater volumetric efficiency.

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Explanation:

20984Po→20582Pb+42α

4520Ca→4521Sc+0-1e+00ν

Explanation:

The alpha decay of polonum-209, which consists of the emission of an alpha particle, will leave behind the atom of a different element.

Notice that the identity of the element changes after the decay. This means that you're dealing with a nuclear transmutation, a process that converts an atom of a given element into an atom of a different element.

Answer:

When iron sulfide is exposed to oxygen it reacts rapidly, releasing large amounts of heat.

Explanation:

i took this from my notes- so whatever aligns with that. sorry if this didnt help but i think its genuinely c heating

0.43 g/L is the concentration of albumin.

The volume of solution:

0.20 mL (volume of solute) + 2.58 ml (volume of solvent) = 2.78 mL (volume of solution)

The calculation for mass:

0.20 mL. 1 L/1000mL = 0.0002 L

We use the concentration to determine

Mass = \(0.0002L.6g/L=0.0012g\)  of albumin.

The calculation for concentration:

Concentration (g/L) = \(0.0012g/0.00278L=0.43g/L\)

Thus, the concentration of albumin is  0.43 g/L.

Concentration in chemistry is calculated by dividing a constituent's abundance by the total volume of a mixture. There are various categories of mathematical description, including mass concentration, molar concentration, number concentration, and volume concentration. Although solutes and solvents in solutions are usually mentioned, the concentration can relate to any form of a chemical mixture. There are different types of molar (quantity) concentrations, including normal concentration and osmotic concentration.

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The average atomic mass of isotopes of magnesium is 23.4 amu

To get the average atomic mass we have to multiply mass of each isotopes to the % of abundance and then add and divided by 100.

Isotope of magnesium given as,

1) 22.5 amu has an abundance of 78%

= (22.5 × 78 )  = 1755.0

2) 25.3 amu has an abundance of 13 %

= ( 25.3 × 13 ) = 328.9

2) 24.6 amu has an abundance of 9 %

= ( 24.6 ×9) = 221.4

The average atomic mass of magnesium will be

= (1755.0 + 328.9 + 221.4 ) /100

= 23.4 amu

Thus,The average atomic mass of isotopes of magnesium is 23.4 amu

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The ph of the solution after 24.00 ml of the hcl has been added is 2.59.

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

Calculation:-

C₁ =  0.25 M naoh

V₁ = 24 ml = 0.024 L

C₂ = 0.10 M

V₂ =  24.00 ml

concentration of acid                                           concentration of base

concentration = N₁V₁                                                   N₂V₂

                        = 0.024 L × 0.25 M                          = 0.10 × 0.024 L  

                         = 6 × 10⁻³   N                                      = 2.4 × 10⁻³ N
Net concentration = 6 × 10⁻³ - 2.4 × 10⁻³

                              = 2.6 10⁻³

pH = - log  [ 2.6 10⁻³ ]

     = 3 - log2.6

     = 3 - 0.41

      = 2.59

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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In the reaction between a monosaccharide and a ferric ion, The carbonyl carbon is oxidized to a carboxyl group, the cupric ion is reduced.

Chemical reactions often involve color changes, temperature changes, gas evolution, or precipitate formation. Simple examples of everyday reactions are digestion, combustion, and cooking. The definition of reaction is a reaction. An example of a reaction is someone stopping their car at a stop sign. noun. response to stimuli.

The five basic types of chemical reactions are combination, decomposition, single exchange, double exchange, and combustion. By analyzing the reactants and products of a particular reaction, we can classify them into one of these categories. Some responses fit into multiple categories. It is modeled after the old Italian reaction, the French response, derived from the medieval Latin response (nominative to react). It is a noun of action formed in Late Latin from the past participle stem of the Latin reader.

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Answer:

For every force one object applies on another, there

is an equal force applied in the opposite direction.

Explanation:

please mark brainliest here

Explanation:

Metallic bond, force that holds atoms together in a metallic substance

One simple method to increase the partition coefficient of a slightly polar organic compound between diethyl ether and water is to adjust the pH of the aqueous phase.

For example, if the compound is a weak acid, increasing the pH of the aqueous phase (making it more basic) would deprotonate the compound, making it more polar and increasing its solubility in water. This would shift the partition equilibrium towards the aqueous phase, resulting in a higher partition coefficient in favor of diethyl ether. Conversely, if the compound is a weak base, decreasing the pH of the aqueous phase (making it more acidic) would protonate the compound, making it less polar and increasing its solubility in diethyl ether. This would shift the partition equilibrium towards the organic phase, resulting in a higher partition coefficient in favor of diethyl ether.  

In summary, adjusting the pH of the aqueous phase is a simple method to manipulate the partition coefficient of a slightly polar organic compound between diethyl ether and water.

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Answer:

Answer A

Explanation:

When light enters a lense it bends and changes direction, and then does this again when it leaves. leaving the correct image in the center

Answer: 85.62 L represents volume (V).

Explanation:

Volume is defined as the amount or quantity of a given substance or an object.

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 4.95 atm

V = Volume of gas = 85.62 L

n = number of moles

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(313K\)

Thus 85.62 L represents volume (V).