Potassium dichromate is used to titrate a sample containing an iron. To perform that, the sample is dissolved in an acidic solution, the solution is then titrated with 25 mL of 0.021 M K₂Cr₂07(294 g/mol), resulting in the formation of Fe3+ and Cr³+ ions in an acidic solution. What is the mass of Fe(II) (55.8 g/mol) in the sample? (equation: 6Fe²+ + Cr₂O7²- + 14H* →6Fe³+ + 2Cr³+ + 7H₂0)​

When one element in the compound has been swapped out for another, the single replacement reaction can be recognized. Option C is right as a result.

The replacement reaction is the process in which a compound is formed after a highly reactive element has replaced a low reactive element.

The reaction is listed as follows:

AX + Y X + AY

The highly reactive X causes Y to replace Y in the complex, creating the compound AX.

One element in a compound is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.

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Among all the statements, statement A is incorrect that is the n = 2 energy level has no d orbitals.

The angular momentum quantum number (l)- The orbital form is determined by this integer with the values l = 0, 1, 2,...,  n - 1.

Because of this, an orbital with n = 1 can only have one value of l, l = 0, while an orbital with n = 2 can have both l = 0 and l = 1. The orbital's overall dimensions and energy are determined by the primary quantum number. The orbital's form is determined by the l value. Subshells are formed by orbitals with the same value of l. Additionally, the angular momentum of an electron in this orbital increases with the angular momentum quantum number.

The d orbitals are the orbitals with l = 2. Then, the value of l is -

I = n-1 = 2 -1 = 1

The p orbitals are represented by the value l = 1 and not the d orbitals.

Thus, statement A in incorrect.

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The energy of a photon is hv. Where h is plank's constant and v be the frequency. The frequency of a photon with an energy of 3.75 × 10⁻²¹ J is 5.66 × 10¹² Hz.

Frequency of a wave is the number of wave cycles per unit time. It is the inverse of the time period. Thus, has a unit of s⁻¹ which is equivalent to Hz.

Frequency of a wave is directly proportional to the energy.

The energy of a photon = hv

h is the planck constant = 6.62 × 10⁻34 J.s

Given the energy of a photon = 3.75 × 10⁻²¹ J

Thus, frequency = energy/planck's constant

= 3.75 × 10⁻²¹ J/ 6.62 × 10⁻34 J.s

= 5.66 × 10¹² Hz.

Therefore, the frequency of the photon is 5.66 × 10¹² Hz.

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A neutron that transforms into a proton is the mode of decay that a neutron-rich nucleus will experience most frequently. Every radioactive isotope with a neutron content less than 83 decays by an electron.

Beta decay will occur in isotopes with a N/Z ratio greater than 1, which translates to an overabundance of neutrons. Stable nuclei for elements with increased atomic numbers can be found at N/Z ratios more than 1 and as high as 1.5.

The nucleus loses two protons during alpha decay. The nucleus either acquires or loses a proton during beta decay. No change occurs in gamma decay the atom does not change into a new element because of an increase in proton number.

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The substances produced during the light-dependent reactions to run the Calvin cycle reactions of photosynthesis are ATP and NADPH.

Thus, the correct answer is A.

The Cаlvin cycle is а cycle thаt tаkes plаce in the stromа of the chloroplаst. The primаry enzyme required for the cycle to occur is the RUBISCO or ribulose-1,5-bisphosphаte cаrboxylаse oxygenаse which is found in the stromа. It is the cycle where the ultimаte plаnt food glucose is synthesized.

The sources of energy in the Cаlvin cycle аre Аdenosine triphosphаte (АTP) аnd Nicotinаmide аdenine dinucleotide phosphаte hydrogen (NАDPH) which аre formed during the light reаction in the thylаkoid membrаne.

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Explanation:

the most likely answer here is cobalt

Because a greater proportion of the Y2Y2 molecules will have the required energy to break through the activation energy barrier, line B will shift to the left.

Any group of atoms joined together by chemical bonds is referred to as a molecule. A molecule is created from any two atoms together. A compound is an organic molecule composed of atoms from several elements. Not all molecules are compounds, yet all molecules are compounds.

A substance like table salt (NaCl), which is formed of two different types of elements (sodium and chlorine), is a compound, but it is not a molecule since the connection that binds NaCl together is an ionic bond.

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More reactive metals will drive less reactive metals from out metal salt complexes. As a result, a new salt as well as the weaker metal are created.

Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as mutability, ductility, and high light reflection. Copper is an example of metal.

Metals have various properties, including strength, hardness, and stiffness. From a small paperclip to a huge airplane, metals may be melted and shaped in to something. They effectively conduct heat and electricity.

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The number of mole of atoms of an element in the given compounds is written as subscripts as shown below:

1) 3 MgCl₂

2) 4 K₂CO₃:

3) NaC₂H₃O₂

Chemical formulas are formulas that are used to represent compounds using the symbol of the elements found in the compounds.

The moles of atoms of each element found in the compound are written as subscripts in front of the element.

The moles of the compound present are written as coefficients in front of the chemical formula of the compound.

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Given the fact that it consumes more water than the other system, the groundwater heater will warm the building more efficiently than the hot water system.

Water that is found underground in saturated regions under the surface of the earth is known as groundwater. The water table is the term for the saturated zone's top surface. Contrary to common perception, subterranean rivers are not created by groundwater.

Fresh water that soaks into in the soil from precipitation or melting snow and ice is called groundwater. It is kept in the microscopic crevices (pores) underlying rocks and dirt. Nearly 95% of the government's fresh water supplies come from groundwater.

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The ratio of the atoms of the iridium and the platinum is; 8.86 : 1. Option B

We know that the atom is the smallest particle of the substances that can be able to take part in a chemical reaction. We know that in the platinum and the iridium, we both have atoms in the substances and now we would want to get the number of atoms that is in each of the elements.

Number of moles of iridium = 100g/192 g/mol = 0.52 moles

Number of moles of platinum = 900g/195 g/mol= 4.6 moles

Number of atoms in the iridium atom = 0.52 moles * 6.02 * 10^23 atoms

= 1.2 * 10^23 atoms

Number of atoms of platinum = 4.6 moles * 6.02 * 10^23 atoms

= 2.7  * 10^24 atoms

Since we have about 100g of the iridium and about 900 g of the platinum, then we have the that the ratio of the atoms of the elements is;

2.7  * 10^24 atoms:  1.2 * 10^23 atoms

= 8.86 : 1

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Answer: 67.5

Explanation:

Brainliest pls

The average atomic mass of the element, given the data in the table is 39.095 amu

From isotopy, we understood that the average atomic mass of elements existing in various isotopic form can be determined by the formula:

Average atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100] + [(Mass of 3rd × 3rd%) / 100]

Where

Now, we shall determine the average atomic mass of the element in the table as follow:

Average atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100] + [(Mass of 3rd × 3rd%) / 100]

Average atomic mass = [(38.96 × 93.26) / 100] + [(39.96 × 0.01) / 100] + [(40.96 × 6.73) / 100]

Average atomic mass = 36.334 + 0.004 + 2.757

Average atomic mass = 39.095 amu

Thhus, the average atomic mass is 39.095 amu

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Pure iron is not so strong to use in construction field. Addition of carbon make iron more strong and less brittle.

The useful form of iron made by incorporating carbon and traces of other metals is called cast iron. Pure form of iron is not strong enough to be useful and it is brittle.

Steel does become stronger and more durable when carbon is added to iron, but only to a certain extent. It will then grow stronger but less resilient (ie like cast iron).

Iron is made stronger by carbon by altering its crystal lattice. In terms of effect, this distortion is comparable to work hardening. Sadly, it is a very complicated impact that depends on how the steel is heat treated and precisely how much carbon is applied. Not all metals are subject to this.

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The effective reducer sodium borohydride. It is extremely efficient at converting aldehydes and ketones into alcohols, although not having the same potency as 1-phenyl-2-butanol.

Due to the distinct substitutions made to the two double-bonded carbons in 1-phenyl-2-butene, it can display geometric isomerism.

The group of chemical substances referred to as secondary alcohols includes 2-butanol, also known as 2-butyl alcohol or 2-hydroxybutane. The typical structure of secondary alcohols is HOC(R)(R') (R,R'=alkyl, aryl), and they are substances that contain a secondary alcohol functional group. A tasteless substance, 2-butanol has no smell.

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The flash of green light 525 nm that contains 189kJ of total energy is  2.39 ×10^29 photons.

The formula below gives the energy EE of a single photon of wavelength lambda.

E = hc/λ, where c is the speed of light and h is the plank constant, with a value of 6.62607015 ×10^34.

To determine the overall number of photons n in a green light flash (525 mm) with a total energy of 189 kJ.

We'll apply the following formula.

n= Et/ E

When we enter the given values into the formula, we see that n= Et/E.

= [tex]\frac{189 *10^3}{6.62607015 *10^−34 × 3*10^8}/ 525 *10^-3[/tex]

Therefore, there are 2.39 ×10^29 photons in a green light with 189 kJ of energy.

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Electrolysis of water produces hydrogen and oxygen gases as it's products.

Electrolysis is defined as a process that makes of an electric current to drive a non-spontaneous chemical reaction. It is an important process for purification and extraction of metals from their ores.It makes use of an electrolytic cell in which two electrodes are present.

The two electrodes are the cathode and anode  where reduction and oxidation reactions take place respectively.In the electrolysis of water hydrogen is collected at cathode and oxygen is collected at anode.

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The complete Lewis electron-dot diagram for ethyne is shown in the attached diagram below:

A lewis electron dot structure can be utilized to represent the number of bonds, the lone pairs left in the atoms, and the bonding atoms in the molecule.

Solid lines are used to represent the bonds between atoms that are directly bonded to one another and excess electrons are denoted as dot pairs and are represented next to the atoms.

As the valence electrons of each carbon atom are equal to 4 from the electronic configuration of the carbon atom. First, the total number of valence electrons in a molecule is 4 + 1 + 1 + 4 = 10.

As each carbon atom needs only 4 electrons to complete its octet. As the octet completes, the rest of the electrons are assigned as the lone pairs of atoms. But there are no lone pairs in the molecule of the ethyne.

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A synthesis reaction is a type of chemical reaction in which two or more reactants combine to form a new compound or product.

In a synthesis reaction, atoms from the reactants are rearranged to form a new chemical structure, with the total number of atoms remaining the same.

Identifying the starting material or reactant, as well as the desired end product or target molecule.

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The balancing of chemical equations is based on the law of conservation of mass.

How could a chemical process be made to balance out? Which integers can be changed, and which cannot?

When an equation is balanced, the coefficients can only be changed (the numbers in front of molecules or atoms).

The coefficients are indicated by the numerals in front of the molecule. Subscripts are the smaller numerals found following atoms. These cannot be changed while balancing chemical equations!

How is a chemical equation brought to equilibrium?

the algebraic balancing technique. Chemical equations can be balanced by assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation.

Equations in mathematics are used to calculate the values of each of these variables

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GAS A, Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass or that the rate of effusion of two gases = square root of the inverse of their molar masses.

PV = nRT, where P is pressure (in atm), V is the volume (in L), n is the number of moles of gas, R is the universal gas constant (0.08206 Latm/molK), and T is temperature, is the formula used to calculate the molar mass (in K).

By dividing the mass of one mole of ammonia by the aforementioned volume, the density can now be computed. This density is somewhat lower than the ammonia density at the STP, which is equivalent to (170.4g/mol)(22.4L/mol)=0.761g/L.

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Explanation:

The value of [H+] can be calculated using the concentration of the HCl solution and the balanced chemical equation for the dissociation of HCl in water:

HCl (aq) + H2O (l) → H3O+ (aq) + Cl- (aq)

The concentration of HCl is 3.65 g / (36.5 g/mol) = 0.1 M

The concentration of H+ ions in the solution can be calculated using the concentration of HCl and the stoichiometry of the dissociation reaction:

[H+] = 0.1 M x (1 mol H+ / 1 mol HCl) = 0.1 M

To show that [OH-] is 1.00 x 10-12 M, we can use the relationship between [H+] and [OH-] in aqueous solutions, which is given by the ion product constant for water (Kw):

Kw = [H+] [OH-] = 1.00 x 10-14

Substituting the value of [H+] that we calculated above, we can solve for [OH-]:

[OH-] = Kw / [H+] = (1.00 x 10-14) / (0.1 M) = 1.00 x 10-12 M

Therefore, the concentration of OH- ions in the solution is 1.00 x 10-12 M.

Answer:

180 ml

Explanation:

The statements which correctly describe and provide evidence for the double replacement reaction are:

The correct options are A, D, and E.

Double replacement reactions are reactions where there is an exchange of radicals between two compounds when their solution is mixed together.

In double replacement reactions, a precipitate is always formed.

Also, the metallic ions trade places such that the cation of one compound is exchanged with the cation of the other compound.

A typical double replacement reaction is illustrated below:

AB + CD ---> AD + CB

where;

A and C are cations

B and D are anions.

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Complete question:

Which statements correctly describe and provide evidence for the double replacement reaction?

The total number of electrons in p orbitals in a silver atom is 18.

The position of silver (Ag) in the fifth row of the periodic table, the 11th column of the periodic table, the 9th column of the transition metal, or the d block, determines the electron configuration for silver (Ag). The atomic number of silver is 47. Consequently, the final electron configuration for silver must be:

[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{9}[/tex]

Now, the total number of electrons in p orbitals are 18.

By changing the [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6}[/tex] , either core notation or noble gas notation [Kr] can be used to write this notation. Then the configuration can be written as-

[tex][Kr] 5s^{2} 4d^{9}[/tex]

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Based on the cues Fe is nothing but ferric which is iron.An very crimson solution containing the ion [Fe (SCN) (H 2 O) 5] results when thiocyanate ions, SCN -, are added to a solution containing iron (III) ions, such as sodium, potassium, or ammonium thiocyanate solution. 2+

In the electrophilic aromatic substitution reaction known as "Friedel-Crafts alkylation," an alkyl substituent is attached to an aromatic ring (benzene). Lewis acids, such as AlCl3 and FeCl3, catalyze these reactions and aid in the production of carbocations from alkyl halides.

The solid phase of the Haber-Bosch Process is heterogeneous catalysis. Both hydrogen and nitrogen, the reactants, are gases. They are both poured into a vessel at a high temperature and extreme pressure in the presence of iron oxide.

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In the given reaction, hydrogen undergoes both oxidation and reduction. Hydrogen first oxidises from 0 to +1 oxidation state and then reduced  to -1 in LiH.

Oxidation is the process by which element combines with oxygen or loses electron forming its higher oxidation state. Whereas reduction is the process of combining with hydrogen or gaining electron to form the lower oxidation state of the element.

If an element undergoes both oxidation and reduction in the same reaction, it is called as disproportionation reaction. In the given reaction hydrogen undergoes disproportionation reaction.

In the molecular state H₂ is in 0 oxidation state and when it turns to LiNH₂, it oxidises to + 1 oxidation state and then reduces to -1 in LiH. Hence, option C is correct.

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Your question is incomplete. But your complete question probably was:

Because pure H2 is a hazardous substance, safer and more cost effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 degrees Celsius. Which of the following happens to H atoms in the forward reaction?

Li₃N(s) + 2 H₂(g) ←→ LiNH₂(s) + 2 LiH(s)

(A) H atoms are oxidized only.

(B) H atoms are reduced only.

(C) H atoms are both oxidized and reduced.

(D) H atoms are neither oxidized nor reduced.

Answer:

In a covalent bond, two atoms are held together by the attraction between each atom and the shared electronsthe nuclei of the two atomsthe valence electrons of the two atoms. The number of covalent bonds that an atom can form depends on the number of energy levelsprotons and neutronsvalence electrons in the atom.

Explanation:

O₂ and O₂⁻ are paramagnetic while O₂²⁻ is diamagnetic. An entity is paramagnetic if it has unpaired electrons in its molecules. The chemical is diamagnetic if every electron is coupled.

Unpaired electrons with magnetic dipole moments are paramagnetic as a result. According to QED, an electron's magnetic moment results from its spins and orbiting motion, granting it angular velocity in the microscopic sense.

Compounds that are magnetic are drawn towards the poles of magnets because they contain 1 or more lone pair of electrons. Due to the requirement of electronegativity in their orbitals, both the element iron as iron (III) are paramagnetic. The majority of the time, iron (II) also occupies the same position.

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Answer:

ZnCO3 solid reacts to form Zn0 solid plus CO2 gas