the atomic mass and abundance of Si-28 is 27.977 amu and 92.2%. The atomic mass and abundance of Si-29 is 28.976 amu and 4.7%. The atomic mass and abundance of Si-30 is 29.974 amu and 3.1%. which is the average atomic mass of silicon?​

The property of fluids that enables ships and balloons to float is known as buoyancy, which is a result of the Archimedes' principle.

Buoyancy is the upward force exerted by a fluid on an object immersed in it. It is responsible for the floating of ships and balloons. The concept of buoyancy is based on Archimedes' principle, which states that an object immersed in a fluid experiences an upward force equal to the weight of the fluid displaced by the object.

When a ship or a balloon is placed in a fluid, such as water or air, it displaces a certain volume of the fluid. The displaced fluid exerts an upward force on the object, which counteracts the downward force of gravity. If the weight of the object is less than the weight of the fluid it displaces, the object will experience a net upward force and will float.

In the case of a ship, its hull is designed to displace a large volume of water, creating a buoyant force that supports the weight of the ship and its cargo. Similarly, in the case of a balloon, the gas inside the balloon is less dense than the surrounding air, causing the balloon to float upward.

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Answer:

Hello there! How are you doing today :] Sand would be a covalent bond.

Explanation:

Silica is one of the main compounds found in sand. It also contains many silicon and oxygen atoms. which; are joined together by covalent bonds in a regular arrangement, forming a giant covalent structure.

The number of protons plus neutrons in the element.

The atomic mass of an element is the sum of the number of protons and neutrons in its nucleus. Therefore, by knowing the atomic mass of an element, we can infer the number of protons plus neutrons in the element.

The number of electrons in the element, the number of protons in the element, and the number of protons plus electrons in the element cannot be inferred from the atomic mass.

The number of protons in an element can also be found on the periodic table. The number of protons is equal to the atomic number of the element. This number is used to identify the element, as each element has a unique atomic number.

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The amount of space that matter occupies is called its volume. Solids, liquids, and gases all have volume.

Te2 (Te2 ion) is formed when tellurium gains two electrons. As a result, Te2 condensed electron configuration is [Kr]. 4d105s25p6

The noble gas arrangement for TE. [Kr] 4d10 5s2 5p4

The electron configuration of a noble gas is identical to that of a tellurium ion. Xenon

The atomic number of the alkali metal sodium is 11. Therefore, the electrical arrangement will be 1s22s22p63s1.

The sodium ion Na+ is a positive ion. This indicates that it has lost one electron because of the configuration. 11Na+:1s22s22p6.

Thus, the Na+ ion contains 10 electrons, matching the number of electrons that the noble gas neon (Ne) has. As a result, neon (Ne) and the Na+ ion have the identical electron configuration.

What is electronic configuration?

The arrangement of electrons in atomic or molecular orbitals within an atom, molecule, or other physical structure is known as the electron configuration. For instance, the neon atom's electron configuration is 1s2 2s2 2p6, which means that 1, 2 and 6 electrons, respectively, are present in each of the 1s, 2s, and 2p subshells.

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Answer:

4.7 x 10^14 Hz

Explanation:

From Bohr's theory, the energy absorbed or emitted (ΔE) by an atom transiting from one energy level to another is given as;

ΔE = E4 - E2

Where;

E4 = energy corresponding to the energy level n=4

E2 = energy corresponding to the level n= 2

ΔE = (-2.10 x 10-19) - ( - 5.20 x 10-19)

ΔE =3.1 x 10-19

But

ΔE = hf

h = Plank's constant

f= frequency of photon absorbed

f = ΔE/h = 3.1 x 10-19/6.6 x 10-34

f = 4.7 x 10^14 Hz

Dilution of the solution can be calculated by the formula of the molarity and volume. The initial volume of 2.50 M solution was 30 mL.

Molar concentration or the dilution factor is in an inverse relationship and with an increase in the dilution, the molarity of the solution decreases.

Given,

Initial molarity = 2.50 M

initial volume = ?

Final molarity = 0.750 M

Final volume = 100.0 ml

Substituting values in the formula:

\(\begin{aligned}\rm V_{1} &= \rm \dfrac{M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.750 \times 100}{2.50}\\\\&= 30 \;\rm mL\end{aligned}\)

Therefore, 30 mL was the initial volume of the solution before it was diluted.

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Bronsted-lowry theory does not define acid and bases particularly but they particularly tell how they react or act in the given chemical reaction.

Bronsted-Lowry theory are also known as proton theory of acids and bases.

From the given reaction, HF contribute a proton, in the form of an H+ atom, to water H2O, producing the fluoride F− and hydronium H3O+ ions. The reactant side of Bronsted-Lowry acid is :

Bronsted−Lowry acid: HF

On the other hand the Bronsted-Lowry base is

Bronsted−Lowry base : H2O

Meanwhile, the particle on the product side that same after the Bronsted-Lowry acid contribute a proton to the Bronsted-Lowry base is called a conjugate base (are able to take a proton) while the persist particles taking a proton is the conjugate acid (are able to contribute a proton). Hence,

Bronsted−Lowry acid : H3O + Bronsted−Lowry base : F−

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Answer:

C

Explanation:

A.

I'm pretty sure if i'm wrong super sorry

Answer:

A

Explanation:

Answer:

HCl+ NaoH- Nacl+H2O

Explanation:

base react with acid

154.99 moles of HNO3 get dissolved in 100ml of water when 10.0 ml of conc. HNO3 (15.5M) is added to it.

Since nitric acid is a moderately potent acid, we assume that the water solvent undergoes complete protonolysis in accordance with the equation:

\(HNO_{3}(aq) + H_{2}O(l)\)  ⇄ \(H_{3}O^{+} + NO_{3}^{-}\)

To the right is where the equilibrium is.

The aqueous solution is now stoichiometric for hydronium ion and nitrate ion, regardless of the initial nitric acid concentration.

V1 (Volume of nitric acid)  = 10.0ml

M1 (Molarity of nitric acid) = 15.5M

V (Volume of Water)  = 100.0ml

n (no. of moles of HNO3 dissolved)  = ?

1) For dilution : M1V1 = M2V2

where : V2 = total volume of the final solution

             M2 = molarity of the final solution

2) Molarity  = ( no. of moles (mol) ) / ( total volume of the solution (l) )

Molar mass of HNO3 = 63.01g

\(M1*V1 = M2*V2 = > M2 = \frac{M1*V1}{V2} \\\\= > M2 = \frac{15.5*10}{110} mol ml^{-1} \\\\= > M2 = 1.409 mol ml^{-1}\\\)

Now, calculate the no. of moles dissolved in the solution :

\(M2 = \frac{n}{V} \\\\= > 1.409 mol ml^{-1} = \frac{n}{110} ml \\\\= > n = 1.409 * 110 mol\\\\= > n = 154.99 mol\)

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Answer:

sp3d

Explanation:

The ground state electronic configuration of tin is; [Kr] 5s²4d¹⁰5p². Hybridization is a valence bond concept that postulates that orbitals of appropriate energy could be mixed in order to produce suitable orbitals that could be used for bonding.

In the formation of Snf5^ -1, there is a hybridization of the 5p, 5d and 6s orbitals to yield the sp3d orbitals required for the formation of the chemical specie hence the answer.

1a. The mass of of C₅H₁₂ is 108 g

1b. The mass of F₂ is 547.2 g

1c. The mass of H₂O₂ is 238 g

1d. The mass of NaOH is 31.2 g

2a. The volume of Ar is 176.96 L

2b. The volume of O₂ is 10.08 L

2c. The volume of C₂H₆ is 27.552 L

The mass of C₅H₁₂ can be obtained as follow:

Mass = Mole × molar mass

Mass of C₅H₁₂ = 1.5 × 72

Mass of C₅H₁₂ = 108 g

The mass of F₂ can be obtained as follow:

Mass = Mole × molar mass

Mass of F₂ = 14.4 × 38

Mass of F₂ = 547.2 g

The mass of H₂O₂ can be obtained as follow:

Mass = Mole × molar mass

Mass of H₂O₂ = 7 × 34

Mass of H₂O₂ = 238 g

The mass of NaOH can be obtained as follow:

Mass = Mole × molar mass

Mass of NaOH = 0.780 × 40

Mass of NaOH = 31.2 g

The volume of Ar can be obtained as follow:

Volume = mole × molar volume at STP

Volume of Ar = 7.9 × 22.4

Volume of Ar = 176.96 L

The volume of O₂ can be obtained as follow:

Volume = mole × molar volume at STP

Volume of O₂ = 0.45 × 22.4

Volume of O₂ = 10.08 L

The volume of C₂H₆ can be obtained as follow:

Volume = mole × molar volume at STP

Volume of C₂H₆ = 1.23 × 22.4

Volume of C₂H₆ = 27.552 L

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Answer:

See answers below

Explanation:

-44.3 kj/mole   *   x moles =  -  18.7 kj

solve for x = .422 mole  dissolved

Mole weight of  NaOH is

                     Na = 22.989     O = 15.999   H = 1.008    gm/mole

                            = ~~ 40 gm/mole   for NaOH

40 gm / mole   *  .422 mole = 16.88 gm  of NaOH

In a close system, the total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.

It is a system that is enclosed and would not allow the flow of any material form itself to another or form another system to itself.

A close system also does not allow transfer of energy between system.

Therefore, the total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.

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Answer:

it's definitely a oxidation reaction because here the oxygen contained OH group present in yeild

Answer:

Helium, this noble gas has the least density at STP

Explanation:

The delta g for the reaction is -7.19 kJ/mol.

The expression for ΔG is ΔG = ΔH - TΔS where ΔH is the enthalpy change of the reaction, ΔS is the entropy change of the reaction, and T is the temperature in Kelvin.

In this case, the temperature is 37°C, which is 310 K.

Consequently, the expression for ΔG isΔG = ΔH - TΔSΔG = (23 kJ/mol) - (310 K)(337 J/K) / 1000 = -7.19 kJ/mol

Therefore, the delta g for the reaction is -7.19 kJ/mol.

G is the system's change in Gibbs (free) energy, and G° is the system's change in Gibbs energy under normal conditions (1 atm, 298 K). On an energy outline, ∆G can be addressed as: Where G is the energy difference between products and reactants.

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Answer:

C8H16

Explanation:

First thing to do here is to calculate the molar mass of the compound

Mathematically;

molar mass = mass/number of moles

we can calculate the number of moles using the ideal gas equation

Mathematically;

PV = nRT

n = PV/RT

where p is the pressure at 5 atm

V is the volume at 568 ml = 568/1000 = 0.568 L

R is the molar gas constant which is 0.0821

T is the temperature which is 120+ 273 = 393k

Inserting these values into the equation, we have

n = (5 * 0.568)/(0.0821 * 393)

n = 0.088 moles

So the molar mass = 10/0.088

= 114 g/mol

Now let’s go to the percentages

C = 84.2/12 = 7.016666666666667

H = 15.8/1 = 15.8

divide by the smallest

C = 7.016666666666667/7.016666666666667 = 1

H = 15.8/7.016666666666667 = 2 approximately

The empirical formula is CH2

So for the molecular formula, we have;

(12 + 2)n = 114

14n = 114

n = 114/14 = approximately 8

So the molecular formula of the liquid will be (CH2)n = C8H16

Answer:  The biology or linguistic  term?

Explanation: The introduction of a plant or animal to a region where it is not indigenous.

The bodies will divide into the superior and inferior sections.

If a transverse cut occurs, the body will divide into two sections: the superior section (also known as the cephalic or cranial section) and the inferior section (also known as the caudal section).

The superior section refers to the upper part of the body, while the inferior section refers to the lower part of the body. This type of cut is commonly used in medical procedures, such as abdominal surgeries, to access organs and tissues in the lower part of the body.

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The actual yield was 1.329 g Ag.

The balanced equation for the reaction between Zinc and Silver Nitrate is:

Zn + 2AgNO₃ -> 2Ag + Zn(NO₃)₂.

Given: 29 g Zn, and 2 g AgNO₃. Molar masses: Zn = 65 g/mol, AgNO₃ = 169.87 g/mol.

Moles Zn = 29/65 = 0.446 mol

Moles AgNO₃ = 2/169.87 = 0.0118 mol

Since the stoichiometric ratio is 1:2 (Zn:AgNO₃), we need 0.223 mol AgNO₃ for a complete reaction.

We have only 0.0118 mol AgNO₃, making it the limiting reagent.

Theoretical yield of Ag: 2 mol Ag produced from 1 mol AgNO₃.

0.0118 mol AgNO₃ * (2 mol Ag / 1 mol AgNO₃) * 108 g/mol (Ag's molar mass) = 2.54 g Ag

The actual yield was 1.329 g Ag.

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If 1 L of oxygen gas is consumed, approximately 1.25 L of water vapor would be produced.

To determine the volume of water vapor produced when a certain amount of oxygen gas is consumed, we need to use the balanced chemical equation for the reaction.

The balanced equation for the reaction between ammonia (\(NH_{3}\)) and oxygen (O2) is: 4 \(NH_{3}\) + 5 \(O_{2}\) → 4 \(H_{2}O\) + 4 NO

From the equation, we can see that 4 moles of ammonia react with 5 moles of oxygen to produce 4 moles of water vapor.

Since the stoichiometry ratio is 5 moles of oxygen to 4 moles of water, we can set up a proportion to find the volume of water vapor produced: 5 mol \(O_{2}\) / 4 mol \(H_{2}O\) = x L \(O_{2}\) / 1 L \(H_{2}O\)

Simplifying the proportion, we find that x, the volume of water vapor, is equal to 1.25 L.

Therefore, if 1 L of oxygen gas is consumed, approximately 1.25 L of water vapor would be produced.

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In order to determine the electronic configuration of cations, electrons are first removed from the outermost p orbital, then from the s orbital, and finally from the d orbitals.

When transition metal cations are formed, the outermost s electrons are always the first to be lost. The charge of 2+ is a highly frequent one for the ions of transition metals since the majority of them have two valence electrons. When transition metals are ionised, electrons are typically taken from the valence-shell s orbitals before they are removed from the valence d orbitals. Ionization energies drop due to the looser coupling of valence electrons further from the nucleus, which makes them easier to remove.

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(a) First, we need to write the combustion reaction for ethanol (CH3CH2OH)

CH3CH2OH + O2 → CO2 + H2O

Then, we need to balance this equation. To do that, remember to start with C, then move on to H and finally balanced the amount of O:

CH3CH2OH + 3 O2 → 2 CO2 + 3 H2O

(b) Since this is a reaction that realeases heat (726.7 kJ /mol of ethanol), we know that is an exothermic reaction and the general scope of an enthalpy diagram would be like this:

Where, for the combustion of ethanol, the reactants would be CH3CH2OH + O2, the products would be CO2 + H2O, and ΔH would be -726.7 kJ/mol

Answer:

A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Explanation:

A balanced chemical reaction gives equivalences in moles that allow stoichiometry calculations to be performed. Mole quantities of one substance can be related to mass quantities using a balanced chemical equation. Mass quantities of one substance can be related to mass quantities using a balanced chemical equation.

Answer:

Higher temperatures means more energy, and a solid phase means the particles are close together. This results in highly energized particles that bump into the particles close to them, who in turn bump into more particles.

Explanation:

waves move faster at higher temperatures and in a solid phase there is more energy and the particles are farther apart there is less energy and the particles are closer together there is less energy and the particles are farther apart there is more energy and the particles are closer together.

The waves move faster at higher temperatures and in a solid phase because there is more energy and the particles are closer together.

A wave can be described as a medium which transports energy without causing net particle movement. Elastic deformation, pressure change, electric along with magnetic intensity, electric potential, or temperature can all be examples.

The quantitative property that's also transferred to a body or a physical system, recognizable in the work performance as well as in the form of heat and light, is called energy.

Temperature is the measurement of a body's degree of hotness or coolness.

The faster the wave is conveyed, the greater the particle interactions are. In general, sound travels quicker through solids than through liquids, and faster through liquids than through gas. Because warmer particles move at a higher pace, the temperature actually speeds up to sound.

Therefore, the correct answer will be option (d).

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