Arrange the measurements from longest length to shortest length.
Longest length
Shortest length
Answer Bank
0.01 km
1 x 10^11 nm
50 in
1000 yards

Since various molecules have varying masses, the mole fraction is distinct from the mass fraction since it reflects a percentage of molecules. The sum of molefraction of all the components is always equal to one. Here the molefraction is 0.35.

The mole fraction is the product of the number of molecules of a specific component in a mixture and its total molecular weight. It is a means to convey how concentrated a solution is.

The molar fraction can be represented by X. If the solution consists of components A and B, then the mole fraction is,

Molefraction = Moles of A / moles of A + moles of B

Let mass be 70.4 g and moles of water is 2.0.

n = 70.4 / 63.01 = 1.11

X = 1.11 / 3.11 = 0.35

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Your question is incomplete, most probably your full question was:

Concentrated nitric acid is 70.4% HNO3 by mass in 2.0 moles of water . What is the mole fraction of nitric acid.

In vivo, the dynamics of cellular metabolism can be quantified using 2H-to-1H exchange in magnetic resonance spectroscopy of 1H nuclei.
To understand this concept, let's break it down step by step:

1. Magnetic resonance spectroscopy (MRS) is a non-invasive imaging technique that uses magnetic fields and radio waves to measure the chemical composition of tissues in the body.
2. In this case, 1H refers to the hydrogen nucleus (proton) in the molecules being studied. Protons are commonly used in MRS because they are abundant in the body and have strong magnetic properties.
3. 2H-to-1H exchange refers to the replacement of deuterium (2H) atoms with hydrogen (1H) atoms in metabolic processes. Deuterium is a stable isotope of hydrogen that can be tracked using MRS.
4. By quantifying the exchange of deuterium with hydrogen, MRS can provide information about the dynamics of cellular metabolism. This means it can reveal how metabolic processes, such as the breakdown of glucose or the synthesis of neurotransmitters, occur in living tissues.
5. The "in vivo" part of the question indicates that this technique is performed on living organisms, allowing researchers to study metabolism in real-time and in its natural environment.
So, in summary, 1H magnetic resonance spectroscopy of 2H-to-1H exchange is a method that uses MRS to measure the dynamics of cellular metabolism in living organisms.

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In the given unbalanced reaction, the number of sodium is not balanced. There must have two sodium in the product side also. The correct formula of sodium sulphate is Na₂SO₄.

According to the law of conservation of mass, the total mass of a system is conserved. Thus, mass can neither be created nor be destroyed. Therefore, for a chemical reaction, the total mass in the product side must be equal to the total mass in the reactant side.

The balanced equation of  a chemical reaction thus, obeying the mass conservation law where, each element have to be equal in number in both sides.

In the given reaction, the number of Na in reactant side is 2 and that in product side is 1 only. Thus total mass of sodium is not conserved. It can be corrected as Na₂SO₄ in the product side.

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Answer: protons

Explanation:

a) Neutrons are located in the nucleus but have a negative charge.

b) Atoms are not subatomic particles but are rather made of subatomic particles.

c) Electrons are subatomic particles with a negative charge that are located outside of the nucleus.

d) Protons are subatomic particles that are located in the nucleus and have a positive charge.

Answer:

Los metaloides serían los elementos con propiedades intermedias. No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides. A pesar de la falta de especificidad en el término, es muy utilizado en los textos químicos, tanto educativos como divulgativos o de investigación.

Explanation:

Answer:

The formula for the anhydrous compound that was part of the mixture called natron that was used by the Egyptians is Na2(CO3)10(H2O).

They use this compound for medicine, cookery, agriculture, in glass-making and to dehydrate egyptian mummies.

Compound of sodium carbonate and sodium bicarbonate was the name of the resulting hydrate that formed.

The pH after the following volumes of titrant have been added 0 ml 20 mL 59. 1 mL 60. 0 mL 71. 4 mL 73. 4 mL are 11.89, 11.89, 8.45, 8.45, 7.98, 8.95 respectively.

The reaction between NH3 and HCl can be represented by the following equation: NH3 + HCl → NH4+ + Cl-

To calculate the pH after different volumes of titrant have been added, we need to determine the amount of titrant that has reacted with the analyte and the resulting concentration of the products.

A. 0 mL of titrant (initial state)

At the start, there is no titrant added to the analyte, so the concentration of NH3 is 0.050 M. NH3 is a weak base, so we can use the Kb expression to calculate the concentration of OH-:

\(Kb = [NH4+][OH-] / [NH3]\)

\(1.8 * 10^{-5} = x^2 / (0.050 - x)\)

initial concentration of NH3 is much greater than the initial concentration of HCl, we can assume that the concentration of NH3 does not change significantly during the titration.

\(Kb = x^2 / 0.050\\x = \sqrt{Kb * 0.050} = 1.3 * 10^{-3} M\)

The concentration of OH- is equal to \(1.3 * 10^{-3} M\), so we can calculate the pH:

\(pH = 14 - pOH = 14 - (-log[OH-]) = 11.89\)

Therefore, the pH at the start of the titration is 11.89.

B. 20 mL of titrant

After adding 20 mL of 0.025 M HCl, the volume of the solution is 50 mL (30 mL NH3 + 20 mL HCl). The moles of HCl added is:

moles of HCl = volume x concentration = 0.020 L x 0.025 mol/L = 5 x 10^-4 mol

Since the reaction is a 1:1 reaction, the moles of NH3 remaining is equal to the moles of HCl added.

concentration of NH3 = moles of NH3 / volume of NH3 = (0.050 mol/L x 0.030 L - 5 x 10^-4 mol) / 0.030 L = 0.048 mol/L

Since the concentration of NH3 has decreased, we need to recalculate the concentration of OH- using the new concentration of NH3:

\(Kb = [NH4+][OH-] / [NH3]\\1.8 * 10^{-5} = x^2 / (0.048 - x)\)

Solving for x, we get:

\(x = 1.3 * 10^{-3} M\)

The concentration of OH- is still \(x = 1.3 * 10^{-3} M\), so we can calculate the pH:

pH = 14 - pOH = 14 - (-log[OH-]) = 11.89

Therefore, the pH after adding 20 mL of titrant is still 11.89.

Similarly for  C. 59.1 mL of titrant

The pH after adding 59.1 mL of titrant is 8.45.

D. 60 mL of titrant

The pH after adding 60 mL of titrant is 8.45.

E. 71.4 mL of titrant

The pH after adding 71.4 mL of titrant is 7.98.

F. 73.4 mL of titrant

The pH after adding 73.4 mL of titrant is 8.95.

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Answer: Polystyrene (PS) is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum.

Explanation:

Answer:

1

atom of

Cu

has a mass of

1.055

×

10

−

22

g

.

Explanation:

1 atom Cu

⋅

1 mol Cu

6.022

×

10

23

atoms Cu

⋅

63.546 g Cu

1 mol Cu

=

1.055

×

10

−

22

g Cu

1 atom of copper must be converted in moles to express it as a quantity that can be converted into grams (our second step).

Avogadro's Number

(

1 mole

=

6.022

×

10

23

particles

)

and the relative atomic mass of copper

(

1 mole of copper = 63.546 g

)

are the equalities required to make this conversion.

Explanation:

The moles can be defined as the mass of the substance with respect to molar mass. The moles of potassium nitrate is 1 mol.

The moles of a compound can be calculated from:

\(\rm Moles=\dfrac{Mass}{Molar\;mass}\)

The molarity can be defined as the moles of solute in a liter of solution.

The molarity can be expressed as:

\(\rm Molarity=\dfrac{Moles\;\times\;1000}{Volume\;(mL)}\)

The molarity of potassium nitrate solution is 2 M, and the volume is 500 mL.

The moles of potassium nitrate is given as:

\(\rm 2\;M=\dfrac{Moles\;\times\;1000}{500\;mL}\\ Moles=\dfrac{2\;\times\;500}{1000}\;mol\\ Moles=1\;mol\)

The moles of potassium nitrate in 2 M, 500 mL solution are 1 mol.

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The pH difference between solution A and solution B is tenfold, indicating that solution A is more acidic than solution B. It's essential to note that the pH scale is logarithmic. option c.

pH is a measure of the acidity or alkalinity of a solution on a scale of 0 to 14, with 0 being the most acidic and 14 being the most alkaline. Each unit on the pH scale represents a tenfold difference in acidity or alkalinity. Therefore, if solution A has a pH of 2 and solution B has a pH of 3, solution A is ten times more acidic than solution B.
To calculate the difference in acidity between the two solutions, we can use the formula:
pH difference = 10^(pH of solution A - pH of solution B)

Substituting the given values into the formula, we get:
pH difference = 10^(2 - 3) = 10^-1 = 0.1
Therefore, solution A is 0.1 times (or 10 times) more acidic than solution B. Alternatively, we could say that solution B is 10 times less acidic than solution A. So, even small changes in pH can have a significant impact on the acidity of a solution. option c.

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Explanation:

Second answer is the correct one.

Answer:

2.916

Explanation:

because the equation for speed is distance divided by time

Christopher can change the force applied to item 3 to cause it to move the same distance that object 1 did. Mass times acceleration equals force (F = ma). As a result, the acceleration will decrease.

if the force is maintained while the object's mass increases. Christopher may thus exert additional force on item 3 to make up for the object's increased mass. In order for object 3 to move the same distance with the same force as object 1, he can also reduce its mass to match object 1's. As an alternative, Christopher can change the amount of friction that object 3 encounters. The force that opposes an object's motion is known as the friction force. If item 3 encounters less resistance to motion,With the same effort, it will travel further. To minimize friction and have item 3 go the same distance as object 1, Christopher might apply a lubricant to it. Christopher may make item 3 travel the same distance as object 1 by changing the force, mass, or friction force of that object.

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Answer:

Joule is the SI unit of work. 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied.

Answer:

Solids, liquids, and gases, exist in the human body. The body is mostly made up of liquid because the human body is 60% water. You would most likely be able to find solids (bones), liquids (blood, stomach acid) and gases (oxygen in your lungs or air in your digestive tract).

Explanation:

Individuals who sporadically engage in physical activity without form, structure, or consistency are in the " Precontemplation" stage of change.
The correct answer is b.

Individuals in the pre-contemplation stage of the Transtheoretical Model of Behavior Change have no intention of changing their behavior in the near future.

They may be unaware of the need for change or may feel resigned to their current behavior. In terms of physical activity, individuals in this stage may engage in sporadic or irregular activity, but they are not yet considering making exercise a regular part of their lifestyle.

Therefore option b is correct.

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Answer:56

Explanation:YW

The density of magnesium will be 1.74 g/cm³ if 23.5 g of magnesium occupies 13.5 cm³

Density is the measurement of how tightly a material is packed together.

It is defined as the mass per unit volume.

Given ;

Formula to calculate density ;

Density = mass / volume

             =23.5 / 13.5 = 1.74 g/cm³

Hence, the density of magnesium will be 1.74 g/cm³ if 23.5 g of magnesium occupies 13.5 cm³.

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Answer:

Yes it does change

Explanation:

Answer:

compound

Explanation:

because it is made up of pure substance consists of atom

Answer:

Organ

Explanation:

I got it right when I took the test.

Answer: a I think

Explanation:

Answer:

I think the answer is a

Explanation:

There is a 33.3% chance that it is correct. Why not risk it?

Answer:

light

Explanation:

I'm not sure to my answer but hope it helps if it is correct:)

The molarity of aqueous potassium hydroxide (KOH) can be calculated using the given information.

First, we need to determine the number of moles of phosphoric acid (H3PO4) used in the reaction. We can use the formula:  

moles = volume (L) × concentration (mol/L)

Given that the volume is 25.0 mL and the concentration is 0.100 M, we can calculate the number of moles of H3PO4 as follows:
moles H3PO4 = 0.0250 L × 0.100 mol/L = 0.00250 mol

According to the balanced chemical equation, 1 mole of H3PO4 reacts with 3 moles of KOH. Therefore, the number of moles of KOH can be determined:
moles KOH = 3 × moles H3PO4 = 3 × 0.00250 mol = 0.00750 mol

Next, we need to calculate the molarity of KOH. Molarity is defined as the number of moles of solute divided by the volume of the solution in liters.
volume KOH = 42.5 mL = 0.0425 L
molarity KOH = moles KOH / volume KOH = 0.00750 mol / 0.0425 L = 0.176 M
Therefore, the molarity of the aqueous potassium hydroxide (KOH) solution is 0.176 M.

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The process of enamination is commonly used to prepare enamines from aldehydes and ketones.

This reaction involves the addition of a secondary amine to a carbonyl compound, which forms an imine intermediate that then undergoes tautomerization to yield the final enamine product. The reaction is typically carried out under basic conditions, with the amine acting as the base catalyst.

The mechanism of enamination involves the formation of a Schiff base intermediate, which is stabilized by resonance. This intermediate then undergoes deprotonation and subsequent tautomerization to form the enamine product. Enamines have a variety of synthetic applications, including in the synthesis of pharmaceuticals and natural products.

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Answer:

Combustion

Explanation:

Making an indent very close to a preexisting indent can distort the stress field and lead to inaccurate hardness measurements. It is crucial to maintain an adequate distance between successive indents to obtain reliable results.

When making hardness measurements, whether by nanoindentation or conventional indentation testing, making an indent very close to a preexisting indent can have a significant effect.

The main effect is the potential interference between the two indents. When the second indent is made close to the first one, it can alter the material's stress field. The stress field refers to the distribution of stress around the indent, and it affects the accuracy of the hardness measurement.

If the second indent is made too close to the first one, it may cause the stress field of the first indent to interact with the stress field of the second indent. This interaction can lead to a distorted stress field and inaccurate hardness measurement.

To obtain accurate hardness measurements, it is essential to ensure a sufficient distance between successive indents. This distance depends on factors such as the material's properties and the size of the indents. A general guideline is to maintain a distance of at least 3-4 times the diameter of the indent. By doing so, the interference between successive indents can be minimized, and more accurate hardness measurements can be obtained.

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The pH of a solution obtained by dissolving two extra-strength aspirin tablets containing 540 mg of acetylsalicylic acid each in 420 mL of water is 2.94.

Given that Ka of acetylsalicylic acid (HC9H7O4) is 3.3×10−4 at 25 ∘C and two extra-strength aspirin tablets containing 540 mg of acetylsalicylic acid each is dissolved in 420 mL of water. We have to find the pH of this solution.

The chemical equation for the dissociation of acetylsalicylic acid is: HC9H7O4 + H2O ⇌ H3O+ + C9H7O4^-Let 'x' be the concentration of H3O+ ions in the given solution. Then, the dissociation of the acid can be written as follows:3.3×10^-4 = x^2 / (0.108 − x). Using this equation and solving for 'x' gives the value of H3O+ as 5.10×10^-4. Therefore, pH = 2.94 which implies that the solution is acidic.

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