Your friend is having trouble writing the electron configuration for Nickel (Ni). In your own words describe how you would teach your friend how to write an electron configuration, and then write the configuration for Ni.

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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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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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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Answer:

When copper is heated in an atmosphere of hydrogen, the hydrogen gas can react with the oxygen present on the surface of the copper to form water. This reaction is known as reduction. The equation for this reaction is:

2H2 + O2 → 2H2O

In this reaction, the oxygen atoms in the copper are reduced (i.e., they gain electrons) and the hydrogen atoms are oxidized (i.e., they lose electrons). As a result, the oxygen is removed from the surface of the copper, leaving it oxygen-free.

This process is often used to purify copper and remove impurities, such as oxygen, that may be present on the surface of the metal. It is also used to produce high-purity copper for use in electrical and electronic applications, where the presence of oxygen can affect the conductivity of the metal.

The temperatures shown to the nearest 0.5°C is 42.5°C.

°C (Celsius):

Hence, as per the given image the temperatures shown to the nearest 0.5°C is 42.5°C.

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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 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?

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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Answer:

180 ml

Explanation:

Molecule move quickly at high temperatures & low pressures. These intermolecular attractive forces diminish as a consequence, and the real gas starts to behave like that of an ideal gas.

Many gases, including gas, oxygen, hydrogen, noble metals, some denser hydrocarbons like atmospheric co2, and combinations like air, can be classified as ideal gases if certain parameters are kept within reasonable bounds over a wide range of temperatures and pressures.

Whenever the pressure is expressed in kPa, the real gases standard is found to be 8.314J/Kmol. The pressure, quantity, temperature, & number of molecules of an ideal gas are all related by a single equation known as the ideal gas law.

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The energy level of the products is lower than the energy level of the reactants, and energy is released throughout the reaction. (Option A)

Chemical processes known as exothermic reactions generate heat. When heat is transferred from the system to its surroundings, as described, the heat flow q is considered negative. Therefore, the H of reaction is negative for exothermic reaction processes.

Therefore, a reaction is exothermic and its enthalpy will be negative if it releases more energy than it takes in. Consider this as a certain quantity of heat evaporating from (or being removed from) the reaction. Endothermic reactions have positive enthalpies because they absorb or use more energy than they produce.

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Answer:

it act has a catalyst

Explanation:

sulphuric acid is a catalyst that is used in the preparation of chrom alum

The RMS speed of an oxygen molecule at 0° temperature is 14.5971m/sec and it move   0.342 times per second back and forth.

We know that RMS speed of molecule is given by the formula=√(3RT /M)

where R is the gas constant,

T is the temperature of molecule

and M is the molecular mass of the molecule.

Now,for oxygen molecule,we know that oxygen have =32g/mol,and temperature in kelvin is C+273=0+273=273K.

So,on putting the value in above formula

=>RMS speed=√(3 × 8.314× 273) / 32

=>RMS speed=√6809.166/32

=>RMS speed=√212.786

=>RMS speed=14.5871m/sec

Now,we need to apply the distance-speed formula for calculating the time.

We have distance as 5m,speed as 14.5871m/sec and t=?;

5=14.5871 × t

=>t=5/14.5871

=>t=0.342sec

Hence, RMS speed is 14.5871m/sec and oxygen molecule will travel back and froth 0.342 times in 1 sec .

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Shroud's vintage t=4.28×10 3yr If the cloth veil from a mummy has a 14C14C energy of 10.0 disintegrations for minute per kg of carbon in comparison to live things that experience

When a government is no longer in effective control, the third component necessary for a state to exist, state structures appear to fall apart. Diverse regions of the nation's borders may be affected by this at varying intensities.

t = k1 ln N 0N t t = - dfrac 1 1.21 times 10-4 text year 1 ln dfrac 9.7 16.3

t=1.21104 yr1 1 ln 16.39.7 t = 4.28times 103 textyr

t=4.28×10 3 yr

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The compounds in each of the following groups in order of increasing acidity or basicity, as indicated are basicity: Mg(OH)2,NaOH and Si(OH)4.

The base MgOH are more weaker as compared to that of the NaOH as these are really less in electronic configuration and has the lowest electrons in NaOH is eventually more stronger than all bases as it has the best conjugation basics property that defines the basic structure and strength.

The NaOH is stronger among all as it is having higher basic properties that's fir the basicity of any base. The Si(OH)4 are the basic that has the lesser basic properties than that of the NaOH and MgOH.

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The green bottom curve represents the catalysed reaction.

It is common practise to use catalysed reactions to quicken a particular chemistry's progress. The catalyst's main function is to offer the reaction a different, lower-energy pathway.

In a catalysed reaction, the reactant molecules readily pass the activation energy barrier and produce products. As a result, the activation energy of an uncatalyzed reaction is higher than the activation energy of a catalysed reaction.

For catalyzed reaction activation energy lower than uncatalyzed reaction. The complexity of the collisions necessary to reach a transition state means that without the catalyst, the Ce4+ ions and Tl+ ions must directly react in a termolecular reaction, which will be substantially slower.

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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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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:

The half-life of a reaction is the time it takes for the concentration of a reactant to decrease to half its initial value. In a first-order reaction, the rate of the reaction is directly proportional to the concentration of the reactant. This means that the rate of the reaction depends on the concentration of compound A.

To calculate the half-life of compound A, you can use the equation:

half-life = (ln(2)) / k

where k is the rate constant for the reaction.

Plugging in the values given in the question, we get:

half-life = (ln(2)) / 0.45

This simplifies to:

half-life = 1.44 / 0.45

Which gives us a final result of:

half-life = 3.2 hours

So the half-life of compound A at 250°C is approximately 3.2 hours.

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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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According to the tlc experiment, chemicals that have a low affinity for the stationary phase and a high affinity for the mobile phase will go the farthest.

A material that has been chemically linked by the joining of two or more distinct components. Sea salt (NaCl), which itself is derived first from elements sodium and chloride, as water (H2O), which is created from the components hydrogen and oxygen are two such examples of compounds.

Any material composed of two or more separate chemical elements mixed together in a certain proportion is called a compound. The interaction of the elements creates chemical connections that are hard to break. Shared or exchanged electrons between atoms cause the formation of these bonds.

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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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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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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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Alkyl halides are produced by adding HBr to alkenes.The pi bond of the alkene functions as a weak nucleophile & reacts with electrophilic proton of HBr, which is a helpful way to conceptualize the reaction.

A 3-membered ring intermediate is produced as a result of the alkene acting as a nucleophile in this reaction and attacking the electrophilic bromine.The carbon that is most capable of stabilizing positive charge then is attacked from of the back side [akin to a backside attack inside the SN2 Mechanism] to produce the trans product.

The free-radical mechanism governs the addition reaction with HBr to an asymmetrical alkene inside the presence of peroxide.Here, an alkene interacts with a bromine radical to make an anti-Markovnikov product.

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The largest percent composition by mass of carbon is d)CH₄ .So,correct option is d.

We need to calculate the molecular mass of each of the compound and then check how much by mass carbon is present in the compound.

a)Molecular mass of calcium carbonate (CaCO₃) is =40+12+3ˣ16=100g

Now,we know that carbon has molecular mass=12g

So,percentage composition of carbon in CaCO₃=(12/100)ˣ100=12%

b)Similarly,molecular mass of carbon dioxide (CO₂)=44g

So,percentage composition of carbon in carbon dioxide is =(12/44)ˣ100=27.27%

c)Molecular mass of Sodium bicarbonate(NaHCO₃)=23+1+12+3ˣ16=84g

So,percentage composition of carbon in NaHCO₃=(12/84)ˣ100=12.85%

d)Molecular mass of methane(CH₄)=12+4ˣ1=16g

So, percentage composition of carbon in methane=(12/16)ˣ100=75%

We can see that by mass largest amount of carbon is present in methane(CH₄).

Hence,correct option is d.

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(Complete question) is:

Which of the following has the largest percent by mass of carbon?

a)CaCO₃

b)CO₂

c)NaHCO₃

d)CH₄

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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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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Answer: 67.5

Explanation:

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