How can you tell if a compound is covalent by looking at the name?
There will be numerical prefixes.
There will be a metal.
There's no way to tell.
There will be roman numerals.

The electron will move to energy level

n =1 ..

We have, an electron in the n= 5 level of an Hydrogen atom emits a photon of wavelength 94.98nm...

Using the Rydberg formula ,

1/ λ = R ( 1/ n²ⱼ- 1/n²ᵢ)

where, lambda ----> wavelength of photon

nⱼ----> excited energy level

nᵢ---> initial energy level at which electron of hydrogen atom emits photon

R -----> Rydberg constant

photon are packet of energy.

we have give nᵢ = 5 , lambda = 94.98nm = 94.98×10⁻⁹m

R = constant = 1.097× 10⁷ m⁻¹

Substitute the values in formula we get ,

10⁹/ 94.98 = 1.097× 10⁷ ( 1/ n²ⱼ - 1/ 25) ⇒ 1/ n²ⱼ - 1/25 = 10^2/94.98×1.097 = 0.95975.68 ⇒ 1/n²ⱼ= 0.99975 ⇒ n²ⱼ= 1.00024 => nj = 1.00012

So, the electron moves from n= 5 energy level to to n= 1 energy level.

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Dibasic bases split into two OH- ions.

What is dibasic acid?
A dibasic acid is one that, when reacting with a base, can release two positively charged hydrogen ions, as well as protons. Diprotic acid is a more recent name for this kind of acid. Normally, an acid and a base will react to create salt and water. When the negative charges hydroxide ion from the base reacts with the positively charged hydrogen ion from of the acid, the result is water: H+ + OH- H2O. Two types of salt can be created from the two hydrogen atoms in a dibasic acid molecule, one of which is an acid salt with a hydrogen atom. One of the most well-known and frequently used acids is sulfuric acid, which is a good illustration of a dibasic acid.

Hence, the answer is Sr(OH)2 and Ca(OH)2.
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The properties of common alloys include the following:

This is referred to as a substance which is composed of two or more elements in which one of them is usually a metal. Examples of alloys include bronze which is made up of copper and tin and brass which is made up of copper and zinc.

They are corrosive resistant and are good conductors of heat and electricity due to their high degree of hardness and toughness which makes them different from their parts and is therefore the correct choice.

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The empirical formula of the compound would be  [tex]P_2O_5[/tex].

The empirical formula of a compound is the chemical formula of the compound based on the simplest whole-number ratio of its component atoms.

The compound in question contains phosphorus, P, and oxygen, O.

P = 43.64

O = 56.36

First, let's find the moles of each atom by dividing their percentage composition by their respective molar weights.

P = 43.64/30.97

  = 1.4

O = 56.36/16

   = 3.5

Next would be to divide the moles by the smallest mole.

P = 1.4/1.4

  = 1

O = 3.5/1.4

   = 2.5

Thus, the smallest, whole-number ratio of the two atoms would be 2:5. In other words, the empirical formula of the compound is [tex]P_2O_5[/tex].

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0.402 is the mole fraction of NaCl in a mixture of 0.564 g of NaCl, 1.52 g of KCl and 0.857 g of LiCl.

Mole fraction is defined as the given amount of moles divided by the total amount of the component in a mixture.

The formula for finding the mole fraction is

Mole Fraction = Moles of Component / Mole of total components

First we have to find the mole of NaCl

Moles of NaCl = Given Mass of NaCl/ Molar Mass of NaCl

= 0.564 gram/58.4 gram/mole

= 0.00965 mole

Now we have to find the mole of KCl

Moles of KCl = Given Mass of KCl/ Molar Mass of KCl

= 1.52 gram/74.55 gram/mole

= 0.0204 mole

Now we have to find the mole of LiCl

Moles of LiCl = Given Mass of LiCl / Molar Mass of LiCl

= 0.857 gram/42.39 gram/mole

= 0.0202 mole

Mole Fraction of the NaCl = Moles of NaCl/ Mole of NaCl + LiCl + KCl

= 0.00965/0.00965 + 0.0204 + 0.0202

= 0.192

Thus, from the above conclusion we can say that 0.402 is the mole fraction of NaCl in a mixture.

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The greatest contributor to the resonance hybrid is the resonance form with the smallest formal charges. The main resonance contributor is the one with the lowest energy. The question was incomplete, this is a general answer.

We can write some Lewis structure for a molecule, differing only in the positions of the electrons. The most stable structure contributes the most to the resonance hybrid. Any of a set of Lewis structures that differ only in the distribution of electrons in covalent bonds and single pairs. the weighted average of the resonance contributors gives the hybrid resonance. It often occurs in structures when the double bond lies opposite the single bond and forms two identical Lewis structures. The point of this is that double bonds and single bonds from one molecular structure can move or exchange positions so as to form a structure that is identical to the previous molecular structure. For example on O₃ (ozone).

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The ester can polymerize if both the acid and the alcohol have different functional groups.

A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical properties. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.

The smallest component of a substance which possesses both its chemical and physical characteristics. One or even more atoms make up molecules.

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Answer:

1.1142614300909401e-23

Explanation:

1.1142614300909401e-23

Ion selective electrodes are those electrodes that converts  concentration of a specific ion that is present in a solution into electrical potential.

These ion selective electrodes are basically electrochemical sensors that work based on the principle of galvanic cell. The set up of these electrodes generally consists of a reference electrode, ion-selective membrane and a voltmeter.

The transport of ions from a region of higher concentration to a region of lower concentration through the selective membrane creates a potential difference. This potential difference can be measured with respect to a standard reference electrode having a constant electrode potential.

They are used for chloride, potassium, calcium, carbon dioxide/carbonate, oxygen, and a variety of other ions. These methods are particularly well suited for field analysis and also online measurements.

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Yes there will a chemical reaction.

What is chemical reaction ?

Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are an integral part of technology, culture, and even life itself. Fuel combustion, iron smelting, glass and pottery making, beer brewing, and wine and cheese making are just a few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes that occur in Earth's geology, atmosphere and oceans, and in all biological systems.

Assume the solution A was acid and solution B was a base. When we'll mix both of them with each other, acid base reaction will occur. It'll lead to the formation of salt , which will get precipitated. So in this reaction, same thing happened . Any one of the solution is acid and other one is base. And when we mix them it undergo acid base reaction and formation of salt occurred which is red precipitation.

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Assuming that none of the water spilled out of the beaker when the block was added, then the scale reads 50 N.

Buoyancy is also called as upthrust. It is an upward force exerted by a fluid that opposes the weight of a partially/ fully immersed object. In column of fluid, pressure increases with depth due to the weight of the overlying fluid.

Given that scale reads 40 N

A block of wood of weight 10 N is placed in beaker,

Now, the scale will read 50 N as it has the weight of both water and wood.  No water is spilled out of beaker when block was added and wood is also present .

Now, total reading on scale is 40+10 =50 N

Although effective weight of wood is less as buoyancy is acting on it.

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the mass of a billiard ball that has a volume of 100 cm³ and a density of 2. 5 g/cm³ is 250 g

mass  can be determined by the density of an object and volume.

The mass of a substance can be calculate by using the formula

From the question

mass = density * volume

mass = 2. 5 g/cm³ * 100 cm³

mass = 250 g

therefore,the mass of a billiard ball that has a volume of 100 cm³ and a density of 2. 5 g/cm³ is 250 g

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Answer:

mass = 44.2 g

Explanation:

We are asked to calculate the mass of 1.3 mol of hydrogen sulfide, H₂S.

To do this, we can use the following formula:

[tex]\boxed{\mathrm{mass = No. \ of \ moles \times M_r}}[/tex].

The [tex]\mathrm{M_r}[/tex] (relative molecular mass) of H₂S is:

[tex]\mathrm{M_r}[/tex] = (2 × 1) + 32

    = 2 + 32

    = 34

Therefore, using the formula above and substituting the data, we get:

mass = 1.3 × 34

         = 44.2 g

NO2 is in the form of O=N+-O, As a nucleophilic leaving group it should be in form of O=N-O¯. So the correct option is first one.

What is nucleophilic aromatic substitution?

NO2 is in the form of O=N+-O, As a nucleophilic leaving group it should be in form of O=N-O¯. So the correct option is first one.

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note: complete question is attached

FCC unit cell consist of O,0,0,0,+1,0 atom.

What is atom?
Each atom is made up of a nucleus one and or more electrons that are bound to it. One or even more protons and a significant number of neutrons make up the nucleus. Only the most prevalent type of hydrogen is neutron-free. Atoms that are neutral or ionised make up every solid, liquid, gas, as well as form of plasma. Atoms are incredibly tiny, measuring typically 100 picometers across. Due to quantum effects, they are so small that it is impossible to predict their behaviour with sufficient accuracy using classical physics, as would be the case, for example, if they were tennis balls.

FCC stand as a face centred cubic unit cell structure
Consists of atom arrange in a cube where is corner of the cube has a friction of an atom with 6 additional fool at terms situated at the middle of every cube.

cube has 8 corners and 6 faces
Each atom at the corner contributes 1/8 of itself to a particular cubic crystal lattice.
A 8 atoms × 1/8 = 1 Atom ( at corners)
Each atom at a face centre contributes 1/2 of itself to a particular cubic crystal lattice.
6 atom × 1/2 = 3 atoms
Total atoms in a fcc lattice is 4 atoms.

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Answer: they are the same because they both convert and deal with thermal energy because it’s not created or destroyed

Explanation:

i really think the answer is

Answer:

What are values for standard temperature?

Check all that apply.

A) 0

E) 273.15

Explanation:

edge 2023

The freezing points of dilute aqueous solutions of equal molality of the two electrolytes then pairs would be most different from each other are LiBr and Al₂(SO₄)₃

Molality is defined as the number of moles of solute per kilogram of solvent freezing point is the temprature at which liquid become a solid called as freezing point and the freezing point of solution are all lower than that of the pure solvent and is directly proportional to the molality of the solute then the pairs would be most different from each other are LiBr and Al₂(SO₄)₃

The given question is incomplete so the complete question is

Molality is defined as the number of moles of solute per kilogram of solvent. In dilute aqueous solutions of electrolytes, the greater the number of particles produced by the electrolyte per kilogram of water, the lower the freezing point of the solution. The freezing points of dilute aqueous solutions of equal molality of the two electrolytes in which of the following pairs would be most different from each other?

A. K2SO4 and CoI2

B. AgClO4 and Ni(NO3)2

C. LiBr and Al2(SO4)3

D. MgCl2 and ZnSO4

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Temperature is a measure of the kinetic energy of the molecules within a substance.

Temperature measures the average kinetic electricity of the particles in a substance. Thermal power measures the whole kinetic energy of the debris in a substance. The greater the motion of debris, the better a substance's temperature and thermal energy.

All molecules have electricity and are in steady motion, they vibrate. This vibration is the energy of the problem and can be measured as temperature. most matter expands when heated, and whilst cooled it contracts. The greater electricity something has, the better its temperature and the greater its molecules are vibrating.

The time period is commonly used for the electricity levels of electrons in atoms, ions, or molecules- which might be sure via the electric subject of the nucleus. Also can seek advice from energy tiers of nuclei or vibrational or rotational energy tiers in molecules.

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Answer: A The total mass of the reactants must equal the total mass of the products.

Explanation:

To known the multiple extraction and methylene chloride reactions.

What is methylene chloride?

Dichloromethane, another name for methylene chloride, is an odorless, flammable liquid with a volatile nature similar to chloroform. Paint stripping, the production of pharmaceuticals, the production of paint removers, and the cleaning and degreasing of metal are just a few of the industries that use methylene chloride in various industrial processes.

What is multiple extraction?

In a multiple extraction procedure, a certain amount of solvent is used to successively extract one layer (often the aqueous layer). If the compound has a low partition coefficient in the organic solvent, the extraction may need to be repeated more than twice or three times.

Because it is denser than water, methylene chloride typically makes up the bottom layer of the two-part mixture. Caffeine can be drawn out of the organic layer by brewing tea and adding methylene chloride to it.

Therefore, Caffeine can be drawn out of the organic layer by brewing tea and adding methylene chloride to it.

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Options A and B are anions whereas options C, D, and F are cations.

Cations are the ions that have a positive charge while the other hand, anions are the ions that are negatively charged. Ions are charged atoms or molecules. If a neutral atom loses one or more electrons, it will attain a positively charged cation whereas if a neutral atom gains one or more electrons, it will have a negatively charged anion.

Cations are positive ions. They are positively charged because they have lost one or more number of electrons and that's why it has more protons than electrons. Anions are negative ions. They are negatively charged because they gain one or more electrons so that's why have more electrons as compared to protons.

So we can conclude that A and B are anions whereas C, D, and F are cations.

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When gasoline is burned in a car engine, thermal energy is converted into mechanical energy.

What is energy conversion?

Energy conversion is the process by which energy is changed from forms supplied by nature to forms used by people.

For this goal, a huge variety of tools and systems have been created over the years. A few of these energy converters are really straightforward. Early windmills, for instance, used wind's kinetic energy to drive machinery that pumped water and ground grain.

Many of the forms that energy takes can be employed in natural processes. It also performs mechanical work to run the machines and offers various services to society, such as lighting, heating, and refrigeration. By applying pressure to the pistons and exerting work on them, the internal combustion engine of a car transforms the potential chemical energy in gasoline and oxygen into thermal energy, which is then translated into mechanical energy that drives the vehicle (raising its kinetic energy).

You can see that the vehicle engine converts the chemical energy that is contained in the fuel into the kinetic energy of expanding gas through combustion in the engine and the wheels. This is a practical energy transfer.

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The unknown gas is the mixture of gas A and gas D as interpreted by the spectra.

The pattern of lines created when light is split into its many frequencies by a prism is known as an emission spectrum. Only specific light wavelengths are emitted when gases are heated (an emission spectrum). Each gas has different wavelength. In a spectrum, an emission line can be seen if a source emits radiation at a particular wavelength. This emission happens when an excited atom, element, or molecule switches to a lower-energy form. Some of the light that passes through a cold item (gas or solid) can be absorbed. The amount of energy that an object's atoms possess is determined by the object's temperature.

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The molality of the solution is 0.010mole/kg.

Molality of a solution is the amount of the substance dissolved in the solvent. It is defined as the molar mass of the solute per 1kilogram of a solvent. Molar mass of the solvent is the amount of the compound divided by the amount of the substance .It is measured in moles.

We can calculate molality by dividing the amount of the solute by the mass of the solvent. Here amount of the solute calculated in moles and the mass of the solvent in grams.

          Molality= amount of the solute/mass of the solvent

      here, amount of the Co2 is 0.145 mole , molar mass is 44.01g/mole and   mass of the water is 591 g(0.59kg).

so, substituting all value in the expression of molality, we get,

            Molality=0.145* 0.044 /0.59kg

                           =0.010mole/kg

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2. When NaCl is dissolved in water it forms Nat and CL-ions which interact with water with ion-dipole forces of attraction. There exists a sphere of water molecules around respective ions.

Whereas in isopropyl alcohol there exists H- Bonds as well as Ion-dipole forces in these dyes in comparison to those there will

3.) There will exist H bonding in all these dyes along with ion-dipole forces of attraction as well as repulsive forces as well because of nonpolar groups in dyes and polar water molecules but attractiveness will be more than that of repulsive ones.

4. Chromatography papers are generally made up of cellulose which is again a polymer of glucose. Now there exist H bonds between hydroxyl groups of paper that are hydrophilic which means water-loving. polymer and water molecules. Because of this H binds chromatography.

B.  There will exist again hydrogen bonds among dye and chromatogram more will be the attractions between dye and paper lesser will be retention factor it will adsorb more or lesser will go with solvent.

In chromatography, there are also intermolecular forces such as hydrogen bonding and dipole-dipole interactions that help keep the analytes on the stationary phase of the column. The stronger the intermolecular forces, the stronger and longer the compound will be retained on the column. It is a type of planar chromatography that uses cellulose filter paper to act as the stationary phase for the separation of compounds.

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The number of atom of hydrogen present in 2.25 moles of cyclohexanol C₆H₁₂O is 1.63×10²⁵ atom

Cyclohexanol is a colorless thick liquid or sticky solid with a faint mothball odor

Here we shall determine the number of moles of hydrogen present in 2.25 moles of cyclohexanol C₆H₁₂O then

1 mole of cyclohexanol C₆H₁₂O contain 12 mole of hydrogen

Therefore 2.25 mole of cyclohexanol C₆H₁₂O will contain = 2.25×12 = 27 moles of hydrogen H

Then we shall determine the number of atom of hydrogen present 2.25 moles of cyclohexanol C₆H₁₂O then

Then from Avogadro hypothesis

1 mole of hydrogen = 6.02×10²³ atom

Then 27 mole of hydrogen = 27 moles ×6.02×10²³ atom

27 mole of hydrogen = 1.63×10²⁵atom

Thus we can conclude that the number of atom of hydrogen present is 1.63×10²⁵atom

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Coefficient 2 should be placed in the equation before the nitric acid in the reactant so that the chemical reaction becomes balanced.

The given chemical reaction is,

Zn + HNO3 --------> Zn (No3)2 + H2

Here, the elements Hydrogen, Nitrogen, and Oxygen are unbalanced.

These elements are altogether found in HNO₃ on the reactant side and are found as nitrate and hydrogen gas on the product side.

To balance the equation, the coefficient 2 is to be added in the reactant side so that 2 moles of Hydrogen, Nitrogen, and Oxygen would be balanced with 2 moles of Nitrate and two moles of Nitrogen.

On adding 2 on reactant side, we get

Zn + 2HNO3 -----------> Zn(NO3)₂ + H₂

This gives us a balanced equation and thus the equation could be balanced this way.

Therefore, coefficient 2 is to be added to make the equation to be balanced.

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Us the PV=nRT formula!