neutral atoms of what elements would be isoelectronic with sn2 and sn4 ions? use shorthand notation to represent the electron configuration of those atoms?

Answer:

The balance equation of Ca(OH)2 + HCl ---> CaCl2 + H2O​

is

Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) +2H2O​ (l) (balanced equation)

Answer:

B.Metal Bhaskar higher density than metal A

If the solutions of NaBr and Hg(NO₃)₂ are mixed, there will be one precipitation reaction.

The precipitation reaction of the given reaction is

 NaBr + Hg(NO₃)₂ ⇒ HgBr₂ + NaNO₃.

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Answer:

A

Explanation:

just did the test

The electron cloud model is the modern model of the atom that contrasts the exact position of the electron.  It is the currently accepted atomic model. Thus, option A is correct.

The electron-cloud model is currently accepted and used model that states about the moving electron cloud around the nucleus in an atom. It contrasts with the previous models.

The electron cloud gives the probable position of the electron rather than a fixed position. It was given by Erwin Schrodinger that showed electrons no longer move in a fixed orbital around the atom.

The position of the electron is determined based on the cloud where they are most likely to be present. The field with high probability is represented as a dense area.

Therefore, option A. electron-cloud model is a modern atomic model.

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This problem is providing us with the molality of a solution of calcium iodide as 0.01 m. So the most likely van't Hoff factor is required and theoretically found to be 3 due to the following:

In chemistry, the correct characterization of solutions also imply the identification of the ions it will release in aqueous solution. For that reason, the van't Hoff factor gives us an idea of this number, according to the formula the solute has got.

In such a way, for calcium iodide, we write its ionization equation as shown below:

\(CaI_2\rightarrow Ca^{2+}+2I^-\)

Assuming it is able to ionize due to the low molality, because if it was higher, then it won't ionize. Hence, since we have three moles of ion products, one Ca²⁺ and two I⁻, we can conclude the van't Hoff factor would be 3, although calculations may lead to a different, yet close result.

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Answer:

According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products

Explanation:

law of conservation of mass

The initial-boundary value problem is 0.  The temperature distribution in the bar as t ∞ for case b is u(x) = 100.

i) The initial-boundary value problem: Initial condition:

u(x, 0) = u0(x) = 100 °C

Boundary conditions:

Case a) u(0, t) = u(L, t)

= 10°C.

Case b) u(0, t) = 0°C,

uL(x) = ∂u/∂x|L

= 0.

ii) Temperature distribution: The temperature distribution in the bar as t→∞ for both cases will be linear and decreasing from 100°C to the imposed boundary conditions at either end of the bar. That is, a linear decrease of temperature from one end to the other.

iii) Solution as t→∞:

a) The appropriate steady-state equation to solve for case a is the ordinary differential equation:

d²u/dx² =0 with the boundary conditions:

u(0) = u(L) = 10°C.

The general solution of the ODE is u(x) = Ax+B.

Applying the boundary conditions gives u(x) = 10(L-x)/L

Thus, the temperature distribution in the bar as t→∞ for case a is u(x,∞ ) = 10(L-x)/L

b) The appropriate steady-state equation to solve for case b is the ordinary differential equation

d²u/dx²=0 with the boundary conditions:

u(0) = 0°C

The general solution of the ODE is u(x) = Ax + B

Applying the boundary conditions gives u(x) = x/l.

Thus, the temperature distribution in the bar as t→∞ for case b is u(x) = 100.

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Answer:

c

Explanation:

Answer:

See explanation

Explanation:

Atomic size increases down the group due to the addition of more shells.

As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.

Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.

Answer:

Option C, the shower not sprayed with any mildew-preventing spray is most likely be the control group in this  study

Explanation:

Complete question

Mildew is a fungus that grows in wet areas and can slowly grow from microscopic to large stains in showers and sinks. Researchers are studying different sprays that could be used to slow down the growth of mildew. They set up different showers that are exactly the same and expose them each to water with the same microscopic amount of mildew. They then spray some of the showers with mildew-preventing sprays and observe how fast mildew grows over time. Which show would most likely be the control group in this study? A- the shower sprayed with many test sprays B- the shower not exposed to any mildew at all C- the shower not sprayed with any mildew-preventing spray D- the shower sprayed with a test spray that is already known to work

Solution

In any experiment, a control group is a group of participants that is not exposed to any treatment so that it can be compared with the experimental group on which the treatment is applied/given.

In this case - experimental group are the stained showers that are subjected to the different types of mildew test sprays while the control group is the the shower not sprayed with any mildew-preventing spray.

Hence, option C is the correct answer

Answer:

satellite

Explanation:

found it on the internet

The correct answer is Radar

The final pressure would be 7905.6 torr when the volume is changed to 1.03 L.

Boyle's law states that

At a steady temperature, the item of weight and volume of a gas is steady.

which implies

P1V1 = P2V2

where

P1 = starting weight

V1 = starting volume

P2 = ultimate weight

V2 = ultimate  volume

Substituting the given values into equation (1), we get:

P1 = 4.62 atm

V1 = 2.33 L

V2 = 1.03 L

Rearranging the equation (1)

P2 = P1V1/V2 = (4.62 atm x 2.33 L)/1.03 L = 10.41 atm

To convert atm to torr, ready to utilize the conversion factor:

As we know that 1 atm = 760 torr

so that, the ultimate weight in torr would be:

P2 = 10.41 atm x 760 torr/atm = 7905.6 torr

P2 = 7905.6 torr

Hence, the ultimate weight would be 7905.6 torr when the volume is changed to 1.03 L. 

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The correct way to set up the relationship between milligrams and grams is 1mg-10-³g. option D is correct.

The milligrams and grams are is eual to the 1g = 1,000mg. 1,000 milligrams (mg) in 1 gram (g).

The conversion of  your gram figure to milligrams multiply your figure by 1000.  1mg is 1/1000g. There are 1,000 milligrams in 1 gram.

Therefore, The correct way to set up the relationship between milligrams and grams is 1mg-10-³g. option D is correct.

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The immediate source of the colored light produced by neon signs is the excitation of the neon atoms.

According to the Bohr theory, when energy is supplied to an atom, the electrons in the atom become excited and move from a lower to a higher energy level. The source of energy that causes excitation may be heat, electric discharge, etc.

As the excited atoms return to ground state, they emit energy in the form of visible light corresponding to a particular wavelength.

The source of the colored light produced by neon signs is the transition of neon atoms from higher to a lower energy level.

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According to Boyle's law, a gas's pressure and the volume it takes up are inversely related.

As a result, the correct answer is that the volume of 1 mol of an ideal gas will rise by a factor of 4 at a constant temperature when the pressure is dropped by a factor of 4 (at constant T).

Boyle's law can be stated as: Pressure is inversely proportional to the volume

P ∝ 1/V

The law can be advantageously stated as follows for comparing the same material under two distinct sets of circumstances:

P₁V₁ = P₂V₂

This equation demonstrates how the gas pressure reduces proportionally as volume rises. Similar to this, the gas's pressure rises as volume falls.

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The main safety hazards of trimethylsilyl chloride (tmscl)  in the lab are,

It could cause severe eye burns.

It is harmful if absorbed through the skin. It could cause severe burns.

It may be harmful if swallowed. Causes severe digestive tract burns.

It may be harmful if inhaled. Causes chemical burns to the respiratory tract.

Prolonged or repeated skin contact may cause dermatitis.

Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.

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The halogen or halogen-containing compound is typically used as a form of topical antisepsis will be "iodophor".

Iodine will be employed as an antiseptic in the manner of a tincture of iodine, essentially an alcoholic solution.

Iodophor would be an iodine-containing solution that also contains a solubilizing agent, like povidone or a surfactant. Iodophor would be a common sanitizer in the dairy but also brewing sectors. Generally, a high molecular weight carrier, commonly a polymer, has been polymerized with iodine.

Therefore, the halogen or halogen-containing compound is typically used as a form of topical antisepsis will be "iodophor".

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The concentration of HNO₃ is approximately 0.307 M.

Concentration is defined as the amount of solute (in moles) divided by the volume of the solution (in liters). In this case, we have 0.220 mol of HNO₃ present in 715 ml (or 0.715 L) of the solution.

Concentration of HNO₃ = moles of HNO₃ / volume of solution

Concentration of HNO₃ = 0.220 mol / 0.715 L

Concentration of HNO₃ ≈ 0.307 M

Therefore, the concentration of HNO₃ in the solution is approximately 0.307 M.

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Answer:

0.305 mol

Explanation:

Ca(NO) is not a molecule. I think you meant to type Ca(NO3)2, which is calcium nitrate.

The moles of a compound is equal to is mass divided by its molar mass.

The molar mass of Ca(NO3)2 is 164.09 g/mol.

50.0 / 164.09 = 0.305

The product of the combustion reaction of lithium is = Lithium Oxide

Lithium-like elements such as sodium and potassium are always stored in air-tight storage to avoid exposure to the air because they start a reaction with the gases present in the atmosphere to avoid this these elements are stored in oil (Lithium in fact float on the oil but the reaction is prevented).

When the process of combustion of lithium starts, a strong red-tinted flame is observed because of its burning.

The following equation shows what happens during the combustion of Lithium in the presence of Oxygen-

              4Li + \(O_{2}\)  →  2\(Li_{2}\)O

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Answer:

Chemical

Explanation:

The Chemical formula is the combination of chemical symbols and numbers that represent the elements and number of atoms within a compound.

Answer:

Chemical

It's chemical

Answer:

MSDSs list Liquid Paper as containing titanium dioxide, solvent naphtha, mineral spirits, resins, dispersant, and fragrances. Liquid Paper came under scrutiny in the 1980s, due to concerns over recreational sniffing of the product. The organic solvent 1,1,1-trichloroethane was used as a thinner in the product.

Explanation:

Answer:

2H2 in products

Explanation:

she should have added another 2 in H2

The edited equation does not balance the number of hydrogens. The correct balanced equation for the given reaction is written as follows:

\(\rm 2H_{2}O \rightarrow 2H_{2} +O_{2}\).

The balanced chemical equation of a reaction represents the perfect stochiometric coefficients of all the reactants and products. Thus, each elements in the reaction have to be equal in both side.

According the mass conservation law, the total mass of the reactants is equal to the total mass of the products. Thus, all elements have to balanced on each side.

When water dissociates into hydrogen and oxygen molecules, 2moles of water undergoes dissociation to give two moles of H2 and one mole of O2. Thus the balanced equation is:

\(\rm 2H_{2}O \rightarrow 2H_{2} +O_{2}\)

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The depth range of the epilimnion in this lake is most likely a. 0 to 3 meters. Option A is correct.

To determine the depth range of the epilimnion, we need to identify the layer of the lake where the temperature change is most rapid, which indicates the transition between the warm surface layer and the colder deep layer.

Looking at the temperature readings, we can see that there is a significant temperature difference between the surface layer (0-3 meters) and the layer below (4-7 meters).

However, the temperature change between 4-7 meters and 8-12 meters is not as dramatic, indicating that the transition between the warm surface layer and the colder deep layer occurs somewhere between 3 and 8 meters.

Hence, A. 0 to 3 is the correct option.

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Answer:

False.

Explanation:

Humans are made of matter too :)

Answer:

see picture for answer

Explanation:

The Ground state electronic configuration of  Cr2+:[Ar] 3d4, Cu2+: [Ar] 3d9, Co3+: [Ar] 3d6

Electronic configuration, sometimes referred to as electronic structure or electron configuration, is the arrangement of electrons in orbitals that surround an atomic nucleus.

1. Cr2+

Atomic no.of Chromium(Cr)=24  

a ground state Chromium's electronic structure is as follows: [Ar] 4s1 3d5 = 1s2 2s2 2p6 3s2 3p6

(Atomic no.of [Ar](argon) = 18)

so,ground state electronic configuration for Cr2+:

[Ar] 4s0 3d4 =[Ar] 3d4

so, ground state electronic configuration of Cr2+:

[Ar] 3d4

2. Cu2+

Atomic number of Copper(Cu)= 29

Ground state electronic configuration of Cu:

[Ar] 4s1 3d10

so, ground state electronic configuration of Cu2+:

[Ar] 4s0 3d9 = [Ar] 3d9

so,electronic configuration of Cu2+:

[Ar] 3d9

3.Co3+

Atomic number of Cobalt(Co)=27

Ground state electronic configuration of Co:

[Ar] 4s2 3d7

so,electronic configuration of Co3+:

[Ar] 4s0 3d6 = [Ar] 3d6

So,electronic configuration of Co3+:

[Ar] 3d6

Therefore the Ground state electronic configuration of

Cr2+:[Ar] 3d4, Cu2+: [Ar] 3d9, Co3+: [Ar] 3d6

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Molecular formula of Acetic acid is CH3-COOH.

It's empirical formula is C2H4O2

A process that may create alpha particles very briefly is Radioactive decay. Radioactive decay is the process by which an unstable atomic nucleus emits alpha particles, beta particles, or gamma rays.

Radioactive decay is the spontaneous process by which unstable atomic nuclei undergo a transformation, releasing energy and particles in the form of radiation. It occurs in certain isotopes, which are variants of elements with different numbers of neutrons in their atomic nuclei.

It can occur naturally or artificially and is used in various fields such as medicine, nuclear energy, and geology.

Thus, the radioactive decay is the process that may create alpha particles very briefly. It is a natural process of transformation of an unstable nucleus, which emits alpha particles, beta particles, or gamma rays. Radioactive decay has many applications in various fields, including medicine, nuclear energy, and geology.

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210 cm converted into inches is 82.67716535 in.