which confirmatory test will be used for iron (iii) , and which one for nickel (ii)? why was this reagent chosen? should the solution be acidic or basic for this test?

The concentration of solution of sodium hydroxide is  4 g/dm³ as per the molar concentration concept, to convert mole/dm³ to g/dm³ multiply the concentration by molar mass, which is 40 g.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

The molar mass of sodium hydroxide is 40 g thus, concentration in mole/dm³×40, that is 0.10×40= 4 g/dm³.

Thus , the concentration in g/dm³ is 4 g/dm³.

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The rate of reaction when 0.4g of zinc trioxocarbonate (iv) reacted with dilute hydrochloric acid to produce zinc chloride and carbon (iv) in  2 minutes is 0.0016 mol/min.

The rate of a reaction is the time taken for product molecules to appear or the time taken for reactant molecules to be converted.

Or

The equation of the reaction is given below:

ZnCO₃ (s) + 2 HCl (aq) ---> ZnCl₂ (aq) + H₂O (l) + CO₂ (g)

Molar mass of zinc carbonate = 125.39=8 g/mol

Moles of zinc carbonate converted = 0.4 / 125.38

Moles of zinc carbonate converted = 0.0032 moles

Time taken = 2 minutes

Rate of reaction = 0.0032/ 2

Rate of reaction = 0.0016 mol/min

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Chemicals that have leached into the soil can be made harmless by bio remediation .

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group j neptunium Atomic number 93

The strength of the bond describes how closely each atom is connected to another atom and how much energy is required to break that connection. The bond length is the average distance between the two atomic nuclei of two molecules that are joined together.

The strength of the bond indicates how strongly each atom is bound to another and how much energy is expended in doing so. The force that a chemical bond utilizes to hold two atoms together is known as bond strength. The amount of energy required to break the bond is expressed in terms of the kilocalories per mole.

The equilibrium separation between the nuclei of two bound atoms in a molecule is referred to as the bond length. The bond length increases with increasing atom size. Bond multiplicity cause decrease in bond length. Rotational spectroscopy, X-ray diffraction, and other methods are used to measure it.

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A student required 0.40 ml more NaOH than because it will use unstable indicator.

Chemical indicator, any substance which indicates visibly the existence or disappearance of a threshold concentration of such a chemical species, for instance an acid or a caustic in a solution, typically through a color change. One such chemical is methyl yellow, which gives an alkaline liquid a yellow color.

Indicators were weak acids as well as bases which exhibit a colour change when hydrogen ion quantity in a solution varies or as a solution's pH changes. In the water, the indicators gently separate to produce ions. Indicators include things like Litmus, turmeric, phenolphthalein, etc.

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ml= 0 ms = +1/2 are the values of the ml and ms quantum numbers for this electron

What is quantum numbers ?

A total of four quantum numbers are used to fully describe the motion and trajectory of each electron in an atom. The combination of all quantum numbers of all electrons in an atom is described by a wave function corresponding to the Schrödinger equation. . Quantum numbers are important because they can be used to determine the electron configuration of atoms and the putative positions of atomic electrons. Quantum numbers are also used to understand other properties of atoms such as: B. Ionization energy and atomic radius.

Atoms have four quantum numbers: principal quantum number (n), orbital angular momentum quantum number (l), magnetic quantum number (ml), and electron spin quantum number (ms). The principal quantum number n is the energy of an electron and probable distance from the nucleus. In other words, it says to the size and energy level of the orbital in which the electron is placed. The number of subshells or l describes the shape of the orbitals. It can also be used to determine the number of angular nodes. The magnetic quantum number ml represents the energy level in the subshell and ms represents the electron spin. This is either upwards or downwards.

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The energy of a photon whose frequency is 5.94 × 10¹⁷ Hz is 3.94 × 10-¹⁶J.

The energy of a photon wave can be calculated by using the following formula:

E = hf

Where;

According to this question, a photon has a frequency of 5.94 x 10¹⁷ Hz. The energy can be calculated as follows:

E = 6.626 × 10-³⁴J/s × 5.94 x 10¹⁷ Hz

E = 3.94 × 10-¹⁶J

Therefore, 3.94 × 10-¹⁶J is the energy of the photon.

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the maximum number of sterioisomers that are possible for bystolic was about 10 sterioisomer

what is bystolic ?

Beta-blockers include Bystolic (Bistolic). It functions by enabling the heart to beat more gradually and weakly, reducing the volume of blood it pumps out, and thus reducing blood vessel pressure. This lessens the strain on the heart and lowers blood pressure while enhancing cardiac pumping efficiency. Additionally vasodilating, bystolic (Bistolic). It thereby prevents the muscles from contracting, keeping the blood vessels open. Blood can flow more freely as a result of relaxed blood vessels.

the maximum number of sterioisomers that are possible for the structure of bystolic drug was 10 sterioisomers

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The result of the test is that the smaller object will have a greater change in motion. Option A

In the simplest sense of the word, a force could be regarded as a push or a pull. We can see that the object irrespective of the mass of the object would continue to be at rest until it is acted upon by a force.

In this question, we are told that Joey is thinking about applying an equal push force to two objects, one with a small mass, and one with a large mass. The force that could move the small mass may not move the large mass due to inertia.

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Answer:Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?

Explanation:

The longer you cook, the more alcohol cooks out, but you have to cook food for about 3 hours to fully erase all traces of alcohol. A study from the U.S. Department of Agriculture's Nutrient Data lab confirmed this and added that food baked or simmered in alcohol for 15 minutes still retains 40 percent of the alcohol.

The initial volume of the argon gas sample at a constant temperature is 36.24 L.

Let the initial pressure and initial volume be P and V respectively

And the final pressure and volume be P' and V' respectively

At constant temperature, for the given sample,

P = 3.34 atm

V = ?

P' = 8.18 atm

V' = 14.8 L

The ideal gas law is PV = nRT,

At constant T (temperature), PV = constant

According to Boyle's law, the product of the pressure and volume of an ideal gas at constant temperature is constant.

For ideal gas argon at a constant temperature, using Boyle's law we get

P * V = P' * V'

3.34 * V = 8.18 * 14.8

V = 121.06 / 3.34

∴ V = 36.24 L

Thus at 3.34 atm and constant temperature, the volume of a sample of agon gas is 36.24 L

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The electron dot structure that correctly illustrates diatomic nitrogen with a triple bond is of diatomic nitrogen which is N≡N.

A Lewis Structure is a simplified representation of the valence shell electrons in a molecule. It is used to show the arrangement of the electrons is arranged around atoms in a molecule.

Usually in Lewis Structure, Electrons are represented by dots but in the case of bonds such as given in the given question, they are represented by lines.

Thus the electron dot structures that correctly illustrate diatomic nitrogen with a triple bond is of diatomic nitrogen which is N≡N.

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A buffer with 0.462 m acetic acid and 0.355 m acetate has a pH of 4.6. The acetic acid ka value is 1.8 x 10-5.

The pH of a buffer solution won't change when small amounts of an acid or an alkali are added.

Simply put, a buffer solution that is acidic has a pH that is lower than 7. Acidic buffer solutions are normally made using a weak acid and one of its salts, frequently a sodium salt.

Alkaline buffer solution has pH higher than 7. The most common method for producing alkaline buffer solutions is to combine a weak base with one of its salts.

pH = -logKa + log([C₂H₃O₂⁻] / [HC₂H₃O₂])

ph = -log(1.8 × 10⁻⁵) + log(0.355 M / 0.462 M)

ph = 4.6

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Reaction Ni²⁺(aq) + 6NH₃(aq) ⇌ [Ni(NH₃)₆]²⁺ will experience a shift towards the products in equilibrium position when the concentration of Ni²⁺ is increased.

According to Le Chatelier's Principle: When the equilibrium is stressed, the response changes to relieve the stress. This means that adding a reactant moves the equilibrium away from the reactant to the right. Adding a product moves the equilibrium away from the product and to the left.

Equilibrium type:

As the concentration of Ni²⁺(aq) increases, the system attempts to reach equilibrium by reducing the increased coefficient according to Le Chatelier's principle. To do this, the concentration of Ni²⁺(aq) must be lowered. Therefore, it is necessary to lower the Ni²+(aq) concentration by promoting forward reaction.

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The given question was incomplete so the complete question is as follows:

Which equilibrium reaction will experience a shift towards the products in equilibrium position when the concentration of Ni2+ is increased? View Available Hint(s) Which equilibrium reaction will experience a shift towards the products in equilibrium position when the concentration of is increased?

Ni(OH)₂(s)⇌Ni²⁺(aq)+2OH⁻(aq)

[Ni(H2O)₆]²⁺(aq)+3En(aq)⇌[Ni(En)₃]²⁺(aq)+6NH₃(aq)

Ni²⁺(aq)+6NH₃(aq)⇌[Ni(NH₃)₆]²⁺

NiS(s)⇌Ni²⁺(aq)+S²⁻(aq)

The melting point of the sample if it is not dried completely after filtering the recrystallized product will have a broad range and will occur at lower range than the actual value.

What is melting point?

Melting point is the temperature at which the solid form of a given substance changes to the liquid form at atmospheric pressure. It is important because, by using the physical property of a substance the substance can be identified.

The sharp range melting point of the substance indicates the purity of the substance. If the sample is not dried completely after recrystallisation, the melting point will have a broad range.

Therefore, if the sample given is not dried completely, it will be impure and the decreases the melting point of the substance. So the actual melting point of the substance cannot be determined.

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The molecule cis-1,2-dibromocyclopentane comes under Stereoisomers.

Stereoisomers are molecules that have the same molecular formula, the same atom connectivity, but they differ in the relative spatial orientation of the atoms.

In cis-1,2-dibromocyclopentane, both bromine atoms are on the same "face" of the cyclopentane ring.

The mass of 45.0 L of at 87.0° C and 950 mm Hg is therefore 72.181 g, we can deduce.

The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).

Volume = 45.0 L

Temperature =87  = (87.0 + 273) K = 360 K

Pressure = 950 mm Hg (1 mm Hg = 0.00131579 atm) = 1.25 at

The following formula is used to calculate moles.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

As shown, enter the values into the formula above.

PV = nRT
1.25 atm* 45.0 L  = n * 0.0821 L atm /mol K * 360 K

n = 1.25 atm* 45.0 L / 0.0821 L atm /mol K * 360 K

n = 56.25 / 29.556

n = 1.90 mol

The mass of a substance divided by its molar mass is expressed in moles. The following formula is used to compute the mass of (molar mass = 37.99 g/mol).

Moles  = mass / molar mass

1.90 mol =  mass/37.99 g/mol

Mass = 72.181 g

The mass of 45.0 L of at 87.0° C and 950 mm Hg is therefore 72.181 g, we can deduce.

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The efficiency of the machine is obtained as 89.3%.

A pulley is one of the types of simple machine. We know that a simple machine has to  do with anything that helps you to be able to do your work more efficiently.

We know that the efficiency has to  do with how well the pulley  is able to do work as we know. In this case we know that the efficiency is obtained from;

Work output/Work input * 100/1

Work output =2500 N *  1.0 m = 2500 J

Work in put =  700 N  * 4 m= 2800 J

Efficiency = 2500 J/2800 * 100/1

= 89.3%

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Polyatomic ion is OOH

Polyatomic ion are ion which consist of more than one atom and atom in a polyatomic ion are usually covalently bonded to one another and therefore stay together as a single or charged unit and here OOH there are two oxygen atom and one hydrogen atom that's it is polyatomic ion

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Apply to a gas molecule's kinetic energy is not the same as telling you the speed, so calling a thermometer a speedometer for atoms is deceptive.

Uniformly, if a sample of water is put down in the freezer, its molecules begin to move slower (with a lower speed) and this is thought the back by a lower thermometer reading. It is in this feeling that a thermometer can be thought of as a speedometer. As John Rennie broaches in the comments, thermometers work for solids, liquids, and gasses, whereas the temperature is comparable to the average. A thermometer would be an average speedometer for the primary molecules of a substance or structure, not specifically separate atoms.

So we can conclude that thermometers compute the average velocity of atoms in a given material or order volume.

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Answer:

a) gain one electron

Explanation:

When the chlorine atom reacts with the sodium atom, it creates NaCl. Sodium would be your cation and chlorine would be your anion. A sodium atom (Na) has a 1+ charge while the chlorine atom (Cl) has a 1- charge. As a result, sodium would lose a valence electron causing chlorine to gain a electron.

It appears that your answer contains either a link or inappropriate words. Please correct and submit again!

This is what it keeps saying when I want to answer so I have commented my answer below:

D.) CI

Hi and Bye, have a good one. '^'

1.81 liters of carbon dioxide are produced when 5.00 grams of hydrogen bicarbonate breaks down.

Mass of hydrogen bicarbonate (H₂CO₃) = 5.00 g

Molar mass of hydrogen bicarbonate = 62 g/mol

Molar mass of carbon dioxide = 44.01 g/mol

Density of CO₂ = 1.97 g / L

Temperature = 25 0C

Pressure = 1.24 atm

Volume of CO₂ = ?

Write the balanced chemical equation

    H₂CO₃ →  CO₂ + H₂O

The molar ratio of hydrogen bicarbonate to carbon dioxide is 1 : 1

It means that when one mole of hydrogen bicarbonate decomposes it will produce one mole of carbon dioxide

Now we will find out the number of moles of hydrogen bicarbonate

    number of moles = mass / molar mass

    number of moles of H₂CO₃ = 5.00 g / 62 g/mol

    number of moles of H₂CO₃ = 0.081 mol

Number of moles of H₂CO₃ = number of moles of CO₂

Hence the number of moles of CO₂ = 0.081 mol

Now find out the mass of CO₂

    mass = number of moles × molar mass

    mass of CO₂ = 0.081 mol × 44.01 g/mol

    mass of CO₂ = 3.565 g

Convert mass to volume

    volume = mass / density

    V of CO₂ = 3.565 g / 1.97 g / L

    V of CO₂ = 1.81 L

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The empirical formula of the compound C₄H₁₀O₁.

The empirical method of a chemical compound is the simplest entire range ratio of atoms present in a compound. The empirical formula of a compound is the most effective whole variety ratio of atoms of each detail in the compound.

Step 1: decide the masses. Step 2: decide the variety of moles by dividing the grams by means of the atomic mass. Step 3: Divide the wide variety of moles of every detail through the smallest quantity of moles. Step 4: Convert numbers to complete numbers.

                                         divide by smallest

64.9% C /12 = 5.4             5.4/ 13.5  = 4

13.5% / 1 H  = 13.5             13.5 /1.35  = 10

21.6% / 16 O  = 1.35          1.5/1.5 = 1

Empherical formula = C₄H₁₀O₁

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The final temperature of the mixed water is 17.43°C.

Principle of Calorimeter:

The body at a higher temperature releases heat while the body at a lower temperature absorbs heat. The principle of calorimetry indicates the law of conservation energy, i.e. the total heat lost by the hot body is equal to the total heat gained by the cold body.

From the calorimeter principle we have:

heat loss by hot water = Heat gained by the cold water

The formula for the heat gained or loss:

Q = m.c.ΔT

Q = heat gained or loss

c = specific heat

ΔT = temperature change

m1 = 100g

m2 = 75g

m2c ΔФ2 = m1c ΔФ1

75 × (71.6-T) = 100× ( T - 23.2)

5370 - 75T = 100T - 2320

175 T = 3050

T = 17.43°C

Therefore the final temperature is 17.43°C

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Answer: 6.59 x 10^24 formula units

Explanation: Formula units are another word for atoms, meaning we use Avogadro's number (6.022x10^23 atoms per mole), we multiply 10.95 by Avogadro's number to get the answer

Answer:

Group VII are called halogens because react with metals to form salts

Answer:

It is ductile.

Explanation:

Cesium belongs to group 1 on the periodic table, meaning it is an alkali metal, not a gas. Alkali metals are soft, malleable, and ductile. They are good conductors of heat and highly reactive in nature, meaning cesium is also highly reactive. Therefore, the only option that would make sense is "It is ductile."