What will determine the number of moles in a sample

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

IF HELPED MARK AS BRAINLIEST

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

Answer its a

Explanation:

Answer:

They both combine with The help of valency, which is the combining capacity of elements

Explanation:

I find it easier to understand valency as part of the Bhor’s model of an atom.

In his model, it was stated that electrons are spread around the nucleus in such a way that there are rings around the model. Each ring has a n value. So, k has 1, l has 2, m has 3 and n has 4...

what you need to know to find the number of electrons in each ring is to solve the formula 2n squared

Then, the valency is the 8 minus the number of electrons in the outermost shell. Remember that 8 is max number I;outer most shell. If you try it out for oxygen, you will get the value of 2 remaining, which can be gained if combined with calcium.

Hope it helps

Answer: A. An electron

Explanation:

Answer:

an electron

Explanation:

The electron has the lowest mass out of them all as the mass of electron is so little that it is neglected while calculating atomic mass which is proton+electron. the mass of electron is 10 to the power -30 kg

1. Fluid compressibility (C): Fluid compressibility refers to the measure of how much a fluid's volume changes in response to a change in pressure.

2. Solution-gas/liquid ratio (SGLR): The solution-gas/liquid ratio represents the volume of gas dissolved in a given volume of liquid at a specific pressure and temperature.

3. Fluid formation volume factor (FVF): The fluid formation volume factor represents the ratio of the volume of a fluid at reservoir conditions (pressure and temperature) to its volume at surface conditions.

4. Fluid densities (ρ): Fluid densities refer to the mass per unit volume of a fluid.

5. Fluid viscosities (μ): Fluid viscosities represent the measure of a fluid's resistance to flow.

1.  Equation: C = -1/V * dV/dP

  Symbol: C

  Unit: 1/Pascal (Pa^-1)

  Correlation: The compressibility of fluids can vary depending on the fluid type. For ideal gases, the compressibility is inversely proportional to pressure.

2.Equation: SGLR = V_gas / V_liquid

  Symbol: SGLR

  Unit: Volumetric ratio (e.g., scf/bbl)

  Correlation: The solution-gas/liquid ratio is influenced by the pressure and temperature conditions, as well as the composition of the fluid.

3. Equation: FVF = V_reservoir / V_surface

  Symbol: FVF

  Unit: Volumetric ratio (e.g., bbl/STB)

  Correlation: The fluid formation volume factor depends on the composition and properties of the fluid, as well as the reservoir conditions.

4. Equation: ρ = m / V

  Symbol: ρ

  Unit: Mass per unit volume (e.g., kg/m^3)

  Correlation: Fluid densities can vary depending on the type and composition of the fluid. For example, water has a density of approximately 1000 kg/m^3.

5. Equation: No single equation; viscosity is measured experimentally using viscometers.

  Symbol: μ

  Unit: Pascal-second (Pa·s) or centipoise (cP)

  Correlation: The viscosity of a fluid is influenced by temperature and pressure. Different fluids exhibit different viscosities, ranging from low-viscosity fluids like water to high-viscosity fluids like heavy oil.

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At the end of the reaction before adding aqueous \(NaHCO_3\), the following chemical species are likely to be present:

A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.

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The pH of the solution is 5.0, which means the [H3O+] concentration is 10^-5 M. Since HA is a weak acid, it can dissociate in water as shown below:

HA + H2O ⇌ H3O+ + A-

Let x be the degree of ionization of HA. The concentration of H3O+ ions in the solution is the same as the concentration of A- ions formed by the dissociation of HA. Therefore, we can write the equilibrium expression as:

Ka = [H3O+][A-]/[HA]

Substituting the known values, we get:

4.0 × 10^-10 = (x)(x)/(0.010 - x)

Solving for x gives us x = 1.0 × 10^-3, which is 0.1%. Therefore, the degree of ionization of HA in the solution is 0.1%. The correct answer is (d).

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Answer:

volume

Explanation:

things expand when heat is applied taking up more space hence volume

Answer:

no similarities but if that's so it's temperature

The purpose of cell wall is to protect the cell and to determine the cell's shape.

Answer:

d. 200.

Explanation:

The reaction is:

2KMnO4 + 16HCl ----> 2KCl + 2MnCl2 + 8H2O + 5Cl2

So 2 moles of KCL are produced form  16 moles of HCL

So 25 moles KCL are made from   25 * (16/2) HCl.

= 25 * 8

= 200 moles. HCl.

The concentration of reactant after 1.3 hours is 0.353 m when the rate constant of a dimerization reaction is 0.014 l/moles.

The dimerization reaction follows a second-order rate law, so the rate equation can be written as k[A]^2, where k is the rate constant and [A] is the reactant concentration. Using the given rate constant of 0.014 l/moles and initial concentration of 0.36 m, we can use the integrated rate law to find the concentration of reactant after 1.3 hours.

ln([A]t/[A]0) = -kt

ln([A]t/0.36) = -(0.014 l/moles)(1.3 hours)

ln([A]t/0.36) = -0.0182

[A]t = 0.36e^(-0.0182)

[A]t = 0.353 moles/l

Rounding to 3 decimal places, the concentration of reactant after 1.3 hours is 0.353 m.

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Answer:

C.4

Explanation:

The arrow 4 represents the transition in which dew is formed.

This is formed as a result of condensation which takes place in the morning or evening and is usually seen on exposed surfaces as water droplets.

The air particles in the form of vapor under low temperatures results in the formation of the substance. The arrow 4 thereby depicts it and makes it the most appropriate choice.,

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Explanation:

During condensation reaction, two molecules combine to form a single molecule with the loss of a small molecule; in dehydration reaction, this lost molecule is water.

The reaction is a small molecule formed from the atoms removed from a single reactant molecule this reaction is knowing as condensation reaction.

Essentially, this is the reverse process of vaporization. In order for water vapor to undergo the process of condensation, which is the change from a gaseous state to a liquid state, it is necessary for a reduction in its temperature to occur until it reaches the dew point or an increase in the pressure to which it is subjected.

In this case the condensation reaction are when two molecules combine to form a single molecule with the loss of a small molecule, in dehydration reaction, this lost molecule is water.

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J.J. Thomson discovered isotopes, which are atoms of the same element with different masses, by studying cathode rays in a mass spectrometer.

Thomson's mass spectrometry experiments showed that neon gas contained two types of atoms, which he called isotopes, with different masses but identical chemical properties. His view of the atom at the time was that it was indivisible and consisted of a positively charged "pudding" with negatively charged electrons embedded throughout it.

Thomson named these different types of atoms "isotopes" from the Greek words for "same place," because they occupy the same place on the periodic table and have the same chemical properties, but differ in their atomic masses.

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The pairs of elements that is most likely to be part of a polyatomic ion is option B:  S and O.

An ion made up of two or more atoms that really combine covalently is referred to as a polyatomic ion. This implies that only non-metals can link covalently with one another since a covalent bond is created when electrons are shared.

S and O atoms, for instance, have a covalent bond and frequently combine to produce polyatomic ions. K and F, Li and I, Mg and Br, on the other hand, are both metals and non-metals. Therefore, because the metal will donate its valence electrons to the non-metal, they will always establish an ionic bond.

As a result, we can draw the conclusion that, among the possibilities provided, S and O pairs of elements are most likely to make up a polyatomic ion.

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Answer:

5.813 mL

Explanation:

You need to use the formula : vol = mass / molar mass x molarity

the molar mass of HCl is 36.46 and the problem gives you the rest of the equation

0.251M x 36.46 = 9.151

53.2g / 9.151 = 5.813 mL

*I don't know some of the units so that's why some of them are blank sorry

*I'm also sorry if this is wrong but it's what I did so..

This problem is asking for the electronegativity differences and polarity for the bonds formed between and K and F, and N and O. At the end, the results are 3.16 and ionic, and 0.40 and covalent, respectively.

In chemistry, chemical bonds are formed when elements either share or gain electrons. Once they form the bond, one can tell much of the properties of the resulting compound based on the type of bond formed.

In such a way, one can evidence de formation of covalent and ionic bonds, the former exhibited when the electronegativity difference is between 0 and about 1.6 and the former beyond 1.7.

In chemistry, electronegativity is the tendency of an atom to attract electrons in a molecule, thus, we have the following for K, F, N and O as required: 0.82, 3.98, 3.04 and 3.44, respectively.

In such a way, one can calculate the difference electronegativity for the pairs KF and NO as shown below:

K-F =3.98 - 0.82 = 3.16

N-O = 3.44 - 3.04 = 0.40

Hence, the K-F bond turns out ionic whereas the N-O, covalent.

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Answer:

NO

Explanation:

NO NO NO

i am way to much of an idiot for this (hope i made you laugh (and mad cuz i did not answer) :3)

Answer:

\/

Explanation:

Plants rely directly on the energy from the sun. The chloroplast create glucose from the sun rays through a process known as photosynthesis. Mushrooms, on the other hand, do not have the ability to use the sun's rays to create food, so they instead gather their energy from the nutrients from the soil or decaying things, such as plants, that once used the sun's radiation as sustenance. So basically mushrooms use the radiant energy from the sun indirectly and plants use it directly

Answer:

so since the model atom was changed as new evidence, and the plum pudding model was a ball of positive charge, the alpha particle scattering which broke up the atom

Thus, the answer is the volume of the copper block in mL is 0.256696 mL.

A chemist has a block of copper metal (density is 8.96 g/mL). The block weighs 2.30 g. What is the volume of the copper block in mL?

The density is given as density = 8.96 g/mL

The weight of the block of copper metal is given as weight = 2.30 g

We know that density = weight/volume,

rearranging this we get;

volume = weight/density

Thus, substituting the values given, we get;

volume = 2.30 g / 8.96 g/mL

The volume of the copper block in mL is given as;

volume = 0.256696 mL

Therefore, the volume of the copper block in mL is 0.256696 mL or about 0.257 mL.

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Yes, the sea is considered a buffer.

A buffer is a solution that resists pH changes when acids or bases are added. The buffering capacity of the ocean allows it to maintain a relatively stable pH even when acids and bases are added.

The ocean's buffering capacity is primarily due to the presence of dissolved compounds such as bicarbonate (HCO3-) and carbonate (CO32-). These compounds act as both weak acids and bases, accepting and releasing hydrogen ions (H+) to maintain pH balance. When carbon dioxide (CO2) in the atmosphere dissolves in seawater, carbonic acid (H2CO3) is produced and decomposed into bicarbonate ions and hydrogen ions.

This transformation helps prevent a rapid drop in pH as excess hydrogen ions combine with carbonate ions to form bicarbonate ions, which can reduce overall acidity.

When alkali such as hydroxide ions (OH-) is added to the ocean, excess hydroxide ions combine with hydrogen ions to form water molecules, reducing alkalinity.

The presence of these dissolved compounds and their interconversion reactions stabilize the pH of the ocean, making it less susceptible to rapid changes in acidity or alkalinity. This buffering capacity is essential for the survival and maintenance of marine life, as many organisms are sensitive to changes in pH.

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the amount of bromoethane (in milli- liters) that are used in this reaction is 74.13ml.

Mol wt of P-Acetamido phenol = 151.16. Mol wt of  Bromoethane  = 108.97. Mol wt of  Acetophenetidin (product) = 179.22. Paraacetamido phenol, mol wt=151.16. Bromoethane= 108.97. By the law of mass action, 151.16 g P-Acetamido phenol will react 108.97g Bromoethane to get 179.22 g Acetophenetidin (product) and 80.91 g Hydrobromic acid as a bye product. Since the density of Bromoethane = 1.47g/cc, the quantity of Bromoethane in milliliters = 108.97/1.47 = 74.13 ml. Activated carbon, also known as activated charcoal, is a form of carbon that has been processed to have small, low-volume pores that increase the surface area available for adsorption or chemical reactions.  Activated carbon is used for a wide range of industrial and environmental applications, including purifying air and water, removing impurities from liquids and gases, and recovering valuable chemicals. In the laboratory, activated carbon is commonly used to purify organic compounds, remove dissolved gases from liquids, and purify water.

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Answer:

Elements that have atomic numbers from 20 to 83 are heavy elements, therefore the ratio is different. The ratio is 1.5:1, the reason for this difference is because of the repulsive force between protons: the stronger the repulsion force, the more neutrons are needed to stabilize the nuclei.

It will take approximately 3.5 minutes to plate out 2.19 g of chromium metal from a solution of Cr3+ using a current of 55.2 amps in an electrolyte cell.

To calculate the time it will take to plate out 2.19 g of chromium metal using a current of 55.2 amps in an electrolyte cell, we can use Faraday's law of electrolysis.

First, we need to calculate the number of moles of Cr3+ ions that will be reduced to form the chromium metal. The molar mass of Cr is 52 g/mol, so 2.19 g of Cr is equivalent to 0.0421 moles (2.19 g / 52 g/mol).

Next, we need to determine the number of electrons required for the reduction of each Cr3+ ion to form Cr. From the half-reaction equation for the reduction of Cr3+ to Cr, we know that 3 electrons are required.

Using Faraday's law, we can calculate the total charge (Q) required to reduce 0.0421 moles of Cr3+ ions to form Cr:

Q = nF
where n is the number of moles of Cr3+ ions (0.0421 mol) and F is the Faraday constant (96,485 C/mol).

Q = 0.0421 mol x 3 x 96,485 C/mol = 11,726 C

Finally, we can calculate the time (t) required to plate out 2.19 g of chromium metal using a current of 55.2 amps:

t = Q / I
where I is the current (55.2 A).

t = 11,726 C / 55.2 A = 212.5 seconds or approximately 3.5 minutes

Therefore, it will take approximately 3.5 minutes to plate out 2.19 g of chromium metal from a solution of Cr3+ using a current of 55.2 amps in an electrolyte cell.

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Answer:

high less air cause there is no trees and lower is the same

Explanation: