Which elements are represented by the following electron configurations:
7 1s²2s²2p 3s²3pº4s¹
1s²2s22p 3s 3p 4s² → (add all of the exponents) → 20-Ca
8 1s²2s²2p 3s²3p 3d³4s²
Which elements are represented by the following shorthand notation:
9 [Ne]3s²
10 [Ne]3s 3p6
[He]2s²2p3→ (write the electron configuration of the element inside the brackets & then add
what you see outside of the brackets)→→ [1s²]2s22p³→ (add all of the exponents)
7- Nitrogen
1s²2s²2p° → 3s² → 3p6 →4s²3d¹04p6 → 5s² →
4d¹05p6
5p6s²4f¹4
6s²4f45d¹0
6d ¹0
6p7s²5f¹4 ->>

Answer:

So there is a physical version of it.

Molecular equation:

CrSO4(aq) + Ca(NO3)2 (aq) —> Cr(NO3)2(aq) + CaSO4(s)

Net ionic:

Ca2+(aq) + SO4(aq) —> CaSO4(s)

A balanced equation is another name for a chemical equation. Any ionic substances or acids are represented as neutral compounds in a molecular equation using their chemical formulae. Following the formula are parenthesis that describe each substance's condition.

A net ionic equation is often constructed using the fewest integer values for the stoichiometric coefficients. As a result, in order to obtain the net ionic equation's final form, it may occasionally be necessary to divide all of the stoichiometric coefficients by a single factor.

The spectator ions are also included in a complete ionic equation, whereas a net ionic equation just displays the chemical species that are engaged in a process. We are able to determine the net ionic equation for a specific

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The average atomic mass of Raiderium = 43.847amu

Average atomic mass = f1M1 + f2M2 + f3M3

where,

f is the fraction representing the natural abundance of the isotope

M is the mass number (weight) of the isotope.

(0.74655)(43.064amu) + (0.24958)(46.125amu) + (0.00387)(47.982amu)  = 43.847amu

Atomic mass (ma or m) is the mass of an atom. Although the SI unit of mass is the kilogram (symbol: kg), atomic mass is often expressed in the non-SI unit Dalton (symbol: Da) – the equivalent of the unit atomic mass unit (u). 1 Da is defined as 1⁄12 of the mass of a free carbon-12 atom at rest in the ground state. Protons and neutrons in the nucleus make up almost all of the total mass of atoms, and the ratio of electron binding energy and nuclear force is small. Thus, the numerical value of atomic mass expressed in Daltons is almost the same as the mass number.

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The transition in an excited hydrogen atom will emit the longest wavelength of light is E2 to E1. Thus option D is correct.

Transition is defined as a specific arrangement along the reaction coordinate.

It can also be defined as the condition corresponding to the maximum potential energy along this reaction coordinate is what is meant by this term.

d-block elements shows transition because they behave in a way that transitions between s-block and p-block components, the d-block elements are known as transition elements.

Transition in the elements occurs when the electrons come under excited state and travel form lower energy level to higher energy level.

Thus, the transition in an excited hydrogen atom will emit the longest wavelength of light is E2 to E1. Thus option D is correct.  

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Answer:

b

Explanation:

water is generally transparent and smooth to the touch unless it is frozen, then it is rough

Among the given isotopes,  ³⁰X₁₅ and ³¹X₁₅ are isotopes of the same element and that element is phosphorous.

Isotopes are those atoms of an element that contains the same atomic number but a different mass number. Isotopes of an element contain an equal number of electrons and protons in their atom but the numbers of neutrons in their respective nucleus are different.

For example, the isotopes of oxygen element are given as oxygen- 16, oxygen - 17, and oxygen-18, these all isotopes have eight protons or electrons.

Given elements are ³⁰X₁₅, ³¹X₁₆, ³¹X₁₅, and ⁶⁰X₃₀. The atoms ³⁰X₁₅ and ³¹X₁₅  have the same atomic number but a different mass number, therefore they are isotopes of the same element. As their atomic number of them is 15 so they are isotopes of phosphorous and ³¹X₁₅ isotope of P has 100 % abundance.

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The amount of energy that must be supplied in the form of heat to 1 mole of substance to raise the temperature by 1 unit is -26.805kJ/mol.

Solution:

= 5.34 kJ/K * 0.31 K

= 1.655 joules kJ

mol of KSCN = mass/MW = 6.00/97.181

mol of KSCN = 0.0617404

= -Qsolutoin/mol = -1.655 /0.0617404 = -26.805kJ/mol.

Molar heat capacity is the amount of energy required to raise the temperature of one mole of a substance by one degree. to find the molar heat capacity of a compound or element, simply multiply the specific heat by the molar mass. The molar heat of the solution is the total energy change when a substance dissolves. KJ/MOL Measured in kilojoules/mole. Molar heat capacity is the amount of heat required to heat 1 mole of a substance to 1 Kelvin.

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Answer:

Boron has different isotopes with different atomic masses. The relative atomic mass of boron, which is 9, is the average of the atomic masses of the isotopes

Explanation:

The relative atomic mass is indicated in terms of its heaviness compared to the parts of mass of carbon-12. The relative mass of boron is 9 means its mass relative to the mass of carbon -12 is 9 amu.

The relative atomic mass of an element is the mass relative to the mass of carbon-12 or it can be defined as the number which indicates how many times the mass of one atom of the element is heavier in comparison to (1/12)th part of the mass of one atom of carbon-12.

Usually the mass number of an atom is the sum of number of protons and number of neutrons. But the actual mass or average atomic  mass is not calculated in this way.

The actual mass is determined using mass spectroscopy. The relative atomic mass of every element is computed based on the mass of C-12 obtained from spectroscopic technique.

Thus the relative atomic mass of boron is calculated in a similar way and it is 9 amu.

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Answer: The number of atoms = Avogadro's number = 6.022 × 10²³

Number of atoms in a mole = Avogadro's number = 6.022 × 10²³

Explanation:

1.

Mole = [tex]\frac{given mass}{molar mass}[/tex]

Also, Mole = [tex]\frac{Number of atoms/molecules/ions}{Avagadro's Number}[/tex]

∴  [tex]\frac{given mass}{molar mass}[/tex]  = [tex]\frac{Number of atoms/molecules/ions}{Avagadro's Number}[/tex]

[tex]\frac{12}{12}[/tex] = [tex]\frac{number of atoms}{Avogadro's number}[/tex]

number of atoms = Avogadro's number

number of atoms = 6.022 × 10²³

2.

Mole = [tex]\frac{Number of atoms/molecules/ions}{Avagadro's Number}[/tex]

1 =  [tex]\frac{Number of atoms/molecules/ions}{Avagadro's Number}[/tex]

number of atoms = Avogadro's number

number of atoms = 6.022 × 10²³

The cell’s pressure potential or ψp is 2.44 bars if the cell contains 0.6M glucose at 20°c with its surrounding solution containing 0.5M glucose.

As;

ψoutside = ψcell ( here ψ represents water potential)

Therefore;

ψp outside + ψs outside = ψp cell + ψs cell ( Since, ψ = ψp + ψs)

As ψs = -iCRT, therefore

0 + (-iCRT outside) = ψp cell + (-iCRT cell)

In iCRT, i represents the ionization constant

C represents the Molar concentration

R represents the Pressure constant 0.0831 liter bars/mole at degrees Kelvin

T represents temperature (degree kelvin)

Substituting the values;

(-1)(0.5M)(0.0831)(20 + 273) = ψp - (1)(0.6M)(0.0831)(20 +273)

-12.17 = ψp cell - 14.61

ψp cell = (-12.17) + 14.61

ψp cell = 2.44 bars

Therefore, the cell’s pressure potential (ψp) is calculated to be 2.44 bars if the cell contains 0.6M glucose at 20°c with its surrounding solution containing 0.5M glucose.

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The functional group with the COOH setting is called Carboxylic acid, which is a type of organic acid, whereas Esters will have COOR representation, Aldehydes wl l be OCH and Alcohols OH, therefore the answer will be number 4

Answer:

So in this problem, were asked to calculate how much heat is required to raise the temperature of a certain amount of water from 25.52 degrees Celsius to 28.75 degree Celsius. So let's start with our equation that relates are variables que which is he is equal to mass proof. That is a rough em mass time specific heat times the change in temperature. So we're looking for heat and mass. We do not have mass, but we do have both the density and the volume of water. And so to find mass weaken knew our 50 milliliters that were given in the problems them times the density of water which is point nine 97 grams for one Miller Leader, Let me fix this night up here seven is well, that is our mess. Variable. We know just from looking at the table 6.1 in the chapter that the specific heat of water is four 0.184 Jules per gram killed in and finally we know that the change in temperature just gonna switch this down. Here is the final temperature 28 0.75 degrees Celsius minus our initial temperature, 25 0.52 degrees Celsius. And we can just plug this into a calculator really quickly. 28 2.75 I'm just going to start on this side of the equation. So the change in temperature is 3.23 degrees Celsius. Times are specific. Heat 4.184 and then times are mass, which is 50 times 500.997 And we get our final answer of 600 73 point.

The moles of the gas when a cylinder contains 30.0 l of oxygen gas at a pressure of 1.9 atm and a temperature of 310 K is 2.2

The ideal gas equation is PV=nRT. P is the pressure, V is the volume, n is the number of moles and T is the temperature

Substituting the values, we get

1.9x30=nx0.0821x310

n=2.2(two significant figures)

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The colour of Variamine blue salt B, a redox indicator changes from yellow to colourless at the endpoint of the complexometric titration indicating alkalinity.

Complexometric titration (also known as chelatometry) is a type of volumetric analysis in which the creation of a coloured complex is utilized to determine the titration's end point. Complexometric titrations are extremely useful for estimating the concentration of a metal ion mixture in solution. EDTA, or ethylenediaminetetraacetic acid, is a frequent indicator for complexometric titration because it may function as a ligand, binding to coordination centers, which are generally metals, to produce colourful complexes. Organic dyes are the most commonly used indicators in complexometric titrations because they generate a colourful complex with the metal ion being titrated. EDTA replaces the indicator during the reaction to create a more stable complex with metal, and when the reaction is through, the colour changes.

The alkalinity of solution is indicated by a colour change from yellow to colourless in the complexometric titration using Variamine blue salt B as the indicator.

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Answer:55*

Explanation:55*

The main idea of the excerpt chemistry in centuries is all the matter present are composed of the atoms.

Aristotle declared that only four element exist in nature. They are -

Air, water, earth, fire.

He stated that all matter are composed of these four elements only.

When the atoms reacts, they form a chemical bond. It is defined as a force of attraction which holds the atoms together to form a compound.

Force of attraction is defined as a type of force which keeps two or more objects close to each other, or together no matter how far or close they are in distance.

Two major categories of forces of attraction are - intramolecular forces and intermolecular forces. Intramolecular is the type of forces in atoms which are present internally. While intermolecular is the type of force which is present in two or more elements.

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Atoms of 124sn are present in 23.0 g of naturally going on the tin: The average atomic mass of Sn is 118. seventy-one g/mole percentage.

This is explained as the Atomic mass of Tin (Sn) = 118.71 g/mol. 1 mol of Sn = 118.71 g.

An atom is the smallest unit of everyday count that bureaucracies a chemical detail. each solid, liquid, gas, and plasma consists of neutral or ionized atoms. Atoms are extraordinarily small, commonly around one hundred picometers throughout.

An atom is a particle of count that uniquely defines a chemical detail. An atom includes a principal nucleus that is surrounded by one or extra negatively charged electrons. Atoms are built of two kinds of elementary particles: electrons and quarks. Electrons occupy an area that surrounds an atom's nucleus. each electron has an electrical rate of -1. Quarks make up protons and neutrons, which, in flip, make up an atom's nucleus.

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The graph below shows the densities of the elements in Group 0 of the periodic table.

What is periodic table?
The chemical elements are shown in tabular form on the periodic table, commonly referred to as the periodic table of the (chemical) elements. It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry. It is a visual representation of the periodic law, which claims that the atomic numbers of chemical elements have a roughly periodic relationship with their attributes. The table is divided into four blocks that are about rectangular in shape. The table's columns are referred to as groups and its rows are known as periods.

The trend in density is that the density increases as you move down Group 0. This is because the elements in Group 0 are all noble gases. The noble gases are all gases at room temperature and pressure. The reason for this is that the noble gases all have full outer shells of electrons. This means that the attractive forces between the nuclei and the electrons are very weak. The noble gases are all very unreactive because of this. The reason that the density increases as you move down Group 0 is because the atoms get larger as you move down the group. The larger the atom, the more massive it is. This means that the atoms are more likely to collide with each other, and so the density of the gas increases.

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the Lewis dot diagram for lithium is

Carbonic anhydrases are a class of zinc containing enzymes that catalyze the conversion of carbon dioxide into bicarbonate ions.

Carbonic anhydrases are a kind of enzyme that catalyzes the interconversion of carbon dioxide, water, and carbonic acid dissociated ions. Most carbonic anhydrases have a zinc ion in their active site. As a result, they are classed as metalloenzymes. Carbonic anhydrase is an enzyme that aids in the quick interconversion of carbonic acid, protons, and bicarbonate ions from carbon dioxide and water.

Carbonic anhydrase is present in the blood, gastrointestinal mucosa, and a trace amount in plasma. Carbonic anhydrase enzymes catalyze the conversion of water and carbon dioxide to carbonic acid dissociated ions. This results in the formation of bicarbonate anions, which dissolve in the blood plasma.

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The solubility constant is[tex]$6.4 \times 10^{-9}$[/tex].

The equilibrium for the solubility of the salt, [tex]$\mathrm{MgF}_2$[/tex] is,

[tex]$$\mathrm{MgF}_2(s) \stackrel{\mathrm{H} \cdot \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q)$$[/tex]

The solubility product constant for [tex]$\mathrm{MgF}_2$[/tex] is,

[tex]$$K_{\text {吶 }}=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2$$[/tex]

The molar solubility of [tex]$\mathrm{MgF}_2$[/tex] is taken as x, the x moles of [tex]$\mathrm{MgF}_2$[/tex]is dissolved in one litre water to produce x moles of [tex]$\mathrm{Mg}^{2+}$[/tex]and 2x moles of [tex]$\mathrm{F}^{-}$[/tex].

[tex]$\begin{array}{lccc} & \mathrm{MgF}_2(s) & \stackrel{\mathrm{H}_2 \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q) \\ \text { Initial } & x & 0 & 0 \\ \text { Change } & & +x & +2 x \\ \text { Equilibrium } & x & 2 x\end{array}$[/tex]

The solubility product constant for[tex]$\mathrm{MgF}_2$[/tex] is,

[tex]$$\begin{aligned}K_{u p} &=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2 \\&=(x)(2 x)^2 \\&=4 x^3\end{aligned}$$[/tex]

Substitute the solubility of [tex]$\mathrm{MgF}_2$[/tex] as [tex]$1.17 \times 10^{-3} \mathrm{~mol} / \mathrm{L}$[/tex]in the above equation as shown below:

[tex]$$\begin{aligned}K_{i p} &=4 x^3 \\&=4\left(1.17 \times 10^{-3}\right)^3 \\&=6.41 \times 10^{-9}\end{aligned}$$[/tex]

The solubility constant is [tex]$6.4 \times 10^{-9}$[/tex].(using 2 significant figures).

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Dehydration Synthesis is the reaction which is responsible for the production of lipids when glycerol is bonded to three fatty acids by the removal of water molecule.

Dehydration synthesis is the creation of larger molecules from smaller monomers and a removal of water molecule takes place .This type of reaction is also classified as condensation reactions.

During this process, the hydrogen of one monomer combines with the hydroxyl group of another monomer releasing a molecule of water. In the attached image, glycerol and fatty acid combine to release water and a lipid molecule is formed.

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Answer:

add a substace devider

Explanation:

i forgot what it was called but there is a chemical that allows the substances to seperste and than you can test the substaces ph and what it is

The nuclide symbol for an atom with 26 protons 31 neutrons and 24 electrons is X⁵⁷₂₆ .

This scientific model is expressed in the form ᵃₙX, where a denotes the total number of protons and neutrons and is also referred to as the mass number, n represents the number of protons which is the atomic number.

Since the number of proton given is 26, then n which is the atomic number is 26. The mass number is the total number of protons and neutrons.

26 + 31 = 57.

Since therefore means that a which is the mass number is 57.

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The aluminum halide is used to increase the electrophilicity of the halogen, in electrophilic aromatic substitutions which is unnecessary because acetanilide is a very good nucleophile.

In electrophilic aromatic substitutions, the aromatic ring acts as the nucleophile, while the other component (halogen, alkyl halide, acyl halide, etc.) acts as the electrophile. The halogen molecules are not great electrophiles, so aluminum halide is added to facilitate the reaction.

However, the nucleophilicity of the aromatic ring can be increased through resonance and inductive effects of the substituents, and in acetanilide the electron-donating amide group is effective enough to make the aromatic ring a good enough nucleophile to, in turn, make the use of aluminum halide unnecessary.

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According to the given statement 0.3345 M  is the molarity of the Ba(OH)₂ solution.

The quantity of a substance in a specific solution volume is known as its molarity (M). The amount of moles of a solute every litre of a solution is referred to as molarity. The molecular concentration of a solution is another name for molarity.

Ba(OH)₂+  2HCl ⇒ BaCl₂ + H₂O

Ratio of moles Ba(OH)₂ ,  

HCl  = 1:2

Amount of HCl consumed

= 0.500/1000*66.90

= 0.03345 mol

So Ba(OH)₂ reacted = 1/2 * 0.03345 mol

If  molarity of Ba(OH)₂ is x then

x/1000*50 = 1/2 * 0.03345

x =  0.3345 M.

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The reaction classification of the reaction, [tex]A_2B (l) -- > A_2 (g) + B_2 (g)[/tex], is a decomposition reaction.

In chemistry, a decomposition reaction is one in which a compound or a reactant decomposes to produce two or more chemically unique substances as the products.

Thus, a typical decomposition reaction can be written as:

AB ---> A + B

Decomposition reactions are the opposite of combination reactions. In combination reactions, two or more reactants combine to form a single product. A combination reaction can be written as:

A + B ---> AB

Considering the reaction in question:  [tex]A_2B (l) -- > A_2 (g) + B_2 (g)[/tex]

[tex]A_2B[/tex] is the reactant. It undergoes a reaction to produce [tex]A_2[/tex] and [tex]B_2[/tex] respectively. In other words, the reaction is a decomposition reaction.

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" 14/7 N and 18/7 N "

Isotopes are two or more different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers.

Isotopy is a phenomenon in chemical element atoms defined by a difference in the mass number of an element's atoms, even if the atoms always have the same atomic number.

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