please help me with it

Answer:

the number of protons in the nucleus of an atom. the number of protons define the identity of an element

K₄ [Fe (CN)₂] is a coordination compound where the oxidation number of Fe is -2. But the negative charge for metal iron is not possible and the actual formula is K₄ [Fe (CN)₆] .

A coordination compound is a complex where an ionic or neutral ligand is coordinated to a metal. The oxidation state of the metal is called the primary valence of the complex.

Here, there are 4 potassium outside the coordination sphere and thus +4 charge is outside hence -4 charge have to be inside to neutralize the compound. The charge of one CN is -1. Thus -2 for two CN.

Total charge is -4 and that of 2CN is -2, thus charge of Fe is -4-(-2) = -2.

Actually this compound do not exists. The correct coordination formula is K₄ [Fe (CN)₆] where Fe is +2 oxidation state.

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Answer:

Distillation is the process of obtaining a liquid from a mixture containing a dissolved solute. The mixture is heated at a temperature just before the boiling point of the liquid. It evaporates and the vapor travels into a condenser flushed with cold water along the outside. The vapor loses its heat energy and cools into a liquid state. It then falls into a beaker on the other end as a distillate.

An example is desalination, where water is removed from seawater.

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It is to be noted that Rahul Kumar the biologist came to India to find problems that he can solve using his knowledge in Biology.

Rahul Kumar, an Indian and the son of a migrant worker from Bihar, graduated with honors from IIT Roorkee and is currently on his way to the United States to pursue his PhD at the University of Utah.

A biologist is a scientist who undertakes biological study. Biologists are interested in researching all forms of life on Earth, whether they be single cells, multicellular organisms, or communities of interacting individuals. They often specialize in a single field of biology and have a specialized research emphasis.

The majority of biologists work full-time at government agencies, private research laboratories, medical testing facilities, higher education institutions, or other research facilities.

Physician's assistants, radiation and nuclear medicine technologists, and registered nurses are among the hospital employment available to those with a bachelor's degree in biology. These positions can also be found in clinics, physicians' offices, nursing homes, rehabilitation institutions, government organizations, the military, and other settings.

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Answer:for making the text look colored and bold

Explanation:It can reacting differently with different mass solution, it also depends on what concentration you're measuring, and what reaction

The pH of the 3.9M of pottasium fluoride is 0.591.

pH of a solution can be described as the figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

The pH of a solution can be calculated by using the following expression:

pH = -log {H}

Where;

According to this question, a 3.9 M potassium fluoride is given. The pH can be calculated as follows:

pH = - log {3.9}

pH = -0.591

Therefore, the pH of the solution is 0.591

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Among the given compounds, H[tex]_2[/tex]S dissolves in water.

The dissolution of compounds in water depends on the polarity of that compound. As water is a polar solvent, polar compounds readily dissolve in water. As it is said that Like dissolves like, we can say that polar and ionic compounds dissolve in polar solvents while, non-polar compounds dissolve in non-polar solvents like benzene, hexane, and other organic solvents.

CBr[tex]_4[/tex], C[tex]_6[/tex]H[tex]_6[/tex], and CCl[tex]_4[/tex] are non-polar compounds and cannot dissolve in water due to the absence of d-orbital in carbon atoms so they cannot accept lone pairs of electrons from water. H[tex]_2[/tex]S  is also non-polar but the presence of a large sulfur atom gets easily polarized as compared to carbon and thus it dissolves in water.

Thus, due to the presence of a Sulfur atom, hydrogen sulfide dissolves in water.

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The number of moles in 0.620 L of a 2.6M KCl solution is 1.61 moles.

Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume as follows:

no of moles = molarity × volume

According to this question, 0.620 L of a KCl solution has a molarity of 2.6 M. The number of moles of the substance is as follows:

no of moles = 2.6M × 0.620L = 1.612moles

Therefore, 1.61 moles is the number of moles in the pottasium chloride solution.

The incomplete question is as follows:

Determine the number of moles contained in 0.620L of a 2.6 M KCl solution.

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The pH of a solution that is 0.21 M sodium fluoride and 0.57 M hydrofluoric acid is 3.36.

given the data as follows :

sodium fluoride ( base ) = 0.21 M

hydrofluoric acid ( acid )= 0.57 M

using the Henderson - Hassel Balch equation we get:

pH = pKa  +  log (base / acid)

pKa of hydrofluoric acid = 3.8

∴ pH = 3.8 + log ( 0.21 / 0.57 )

pH = 3.8 + ( - 0.4341)

pH = 3.36  

Thus, The pH of a solution that is 0.21 M sodium fluoride and 0.57 M hydrofluoric acid is 3.36.

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The equation of the reaction can be obtained as the net ionic equation of the reaction is; [tex]Fe^{2+} (aq) + CO_{3} ^{2-} (aq) ----- > Fe CO_{3} (s)[/tex]

The term net ionic equation has to do with the fact that we have considered the is that did not participate in the reaction. These ions that did not change in the course of the reaction are called the spectator ions in the reaction.

As we look at the reaction, we can see that ions that did not change in the reaction are the chlorate ion and the sodium ion. Thus the net ionic equation can be written as; [tex]Fe^{2+} (aq) + CO_{3} ^{2-} (aq) ----- > Fe CO_{3} (s)[/tex].

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Answer:

Na,Ba,Ti,on their placement on the periodic table...

Answer:

"When the same amount of electricity is passed through different electrodes, the mass of electrodes liberated during electrolysis is directly proportional to its chemical equivalent."

The number of atoms of Oxygen in 7.23 moles of Fe(NO₃)₃ is 3.92 x 10²⁵.

Determine to total number of individual molecules of Fe(NO₃)₃ in 7.23 moles.

Use Avogadro's number for this: 1 mole = 6.02 x 10²³ molecules.

Thus, 7.23 moles of Fe(NO₃)₃ contains molecules,

7.23 x 6.02 x 10²³ = 4.35 x 10²⁴ molecules of Fe(NO₃)₃.

Determine how many oxygen atoms in one molecule of Fe(NO₃)₃. There are 3 Oxygen atoms in the nitrate NO₃, and 3 nitrate groups in Fe(NO₃)₃. Thus, number of oxygen atoms in Fe(NO₃)₃ is,

3 x 3 = 9 Oxygen atoms in 1 molecule of Fe(NO₃)₃.

Finally, multiply the number of O atoms in 1 molecule of Fe(NO₃)₃ by the total number of Fe(NO₃)₃ molecules.

9 x 4.35 x 10²⁴ = 3.92 x 10²⁵ total Oxygen atoms.

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The total moles of ions produced when dissolving 9.44 g of CuSO₄.5H₂O completely in water is 0.0756.

A mole is described as a scientific unit for the measurement of a large number of quantities of ions, atoms, molecules, or other particular particles.

The number of entities present in one mole is equal to 6.023 × 10 ²³ is known as Avogadro’s number.

Given, the mass of CuSO₄.5H₂O sample = 9.44 g

The mass of 1 mole of CuSO₄· 5H₂O = 250 g/mol

Number of moles of CuSO₄· 5H₂O = 9.44/250 = 0.0378 mol

The dissociation of CuSO₄· 5H₂O when dissolved in water as:

[tex]CuSO_4.5H_2O \longrightarrow Cu^{2+} (aq) + SO_4^{2+} (aq) + 5H_2O (l)[/tex]

The number of Cu²⁺ ions of 0.0378 mol of CuSO₄· 5H₂O = 0.0378

The number of SO₄²⁻ ions of 0.0378 mol of CuSO₄· 5H₂O = 0.0378

Total moles of ions in the given sample= 0.0378 + 0.0378 = 0.0756 mol

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bace, acid and I'd not

bace, acid

A = 2.86 x [tex]10^{23[/tex] molecules of  [tex]KMnO_4[/tex]

B = 323.76 grams of Al

C = 1.53 moles of Au

D = 7.71 x [tex]10^{23[/tex] molecules of [tex]H_3PO_4[/tex]

E = 4.52 x [tex]10^{23[/tex] total atoms

According to Avogadro, a single mole of any substance contains 6.022 x [tex]10^{23[/tex] molecules or atoms of the substance.

Also, the mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. In other words;

mole = mass/molar mass

These theories are what we need to solve the outlined problems.

       Mole of 75 g of [tex]KMnO_4[/tex]:

       mass/molar mass = 75/158

                                     = 0.4747 mol

        Since 1 mole = 6.022 x [tex]10^{23[/tex] molecules

         0.4747 mole = 0.4747 x 6.022 x [tex]10^{23[/tex]

                                = 2.86 x [tex]10^{23[/tex] molecules

       Since 1 mole =  6.022 x [tex]10^{23[/tex] molecules or atoms

        7.23 x [tex]10^{24[/tex] atoms = 7.23 x [tex]10^{24[/tex] / 6.022 x [tex]10^{23[/tex]

                                     = 12 moles

        Mass of 12 moles Al = 12 x 26.98

                                          =  323.76 grams    

                                    = 1.53 moles

                                   = 1.28 moles

         1.28 moles = 1.28 x 6.022 x [tex]10^{23[/tex]

                            = 7.71 x [tex]10^{23[/tex] molecules

                                        = 4.52 x [tex]10^{23[/tex] atoms

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From the calculations, the new volume of the gas is 30.2 L.

We know that we can be able to obtain the parameters that ahs to do with the gas by use of any of the equations of the laws that relate to an ideal gas.

Given that the;

Initial volume [tex]V_{1}[/tex] = 35.0 L

Initial temperature [tex]T_{1}[/tex] =  268 K

Initial pressure [tex]P_{1}[/tex]  = 5.16 atm

Final temperature [tex]T_{2}[/tex] = 343 K

Final pressure [tex]P_{2}[/tex] =  7.65 atm

Final volume [tex]V_{2}[/tex] = ??

Then we have to use the general gas equation;

[tex]P_{1}[/tex] [tex]V_{1}[/tex]/ [tex]T_{1}[/tex]=  [tex]P_{2}[/tex] [tex]V_{2}[/tex]/ [tex]T_{2}[/tex]

[tex]V_{2}[/tex] =  5.16 * 35.0 *  343/7.65 * 268

[tex]V_{2}[/tex] = 61945.8/2050.2

[tex]V_{2}[/tex] = 30.2 L

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The new volume of the balloon is 26.307L. This can be solved with the help of Charles' law.

What is Charles' law?

According to the Charles' law, the volume of the gas is directly proportional to the temperature at constant pressure.

Here we assume that the pressure is constant in both the cases.

V1/T1 = V2/T2

30.6L/285.15K = V2/245.15K

V2= 26.307L.

Therefore, the new volume at -28 degree Celsius and constant 1 atm pressure is 26.307L according to Charles' law.

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The ratio of mol of ZnSO₄ : mol H₂O is 1:7.

Empirical formula- The relative ratios of the various atoms in a compound are given by an empirical formula. The ratios are still valid at the molar level. As a result, H₂O is made up of two hydrogen and one oxygen atoms. Similar to how 2.0 moles of hydrogen and 1.0 mole of oxygen make up 1.0 mole .

Steps to determine Empirical formula-

Determine the masses in Step 1. Step 2: Multiply the grams by the atomic mass to get the number of moles. Step 3: Subtract the smallest number of moles from the total number of moles of each element. Step 4: Make entire numbers out of the numbers.

Given,

0.05216 mol of ZnSO₄

0.3609 mol of H₂O

Here, the smallest number of mole is 0.05216.

Dividing each by the smallest number of moles to get the ratio -

⇒ 0.05216/ 0.05216 = 1

⇒ 0.3609/ 0.05216 = 6.91 ≈ 7

Therefore the mol ratio of ZnSO₄ and H₂O are 1 and 7 respectively.

Hence, 1 mol ZnSO₄ : 7 mol H₂O.

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The molecular structure of C4H6 rigid is Not rigid.

The Schrödinger equation, a quantum mechanical equation for the motion of electrons in the field of nuclei, can theoretically be used to identify the molecule structure. The bond lengths and bond angles in a molecular structure are those where the molecular energy is lowest. The numerical solution of the Schrödinger equation to determine structures has developed into a highly developed technique requiring the use of computers and supercomputers.

Either either neutron diffraction or microwave vibration-rotation spectra are used to determine the nuclear locations within a molecule. X-ray diffraction investigations can be used to analyse the electron cloud that surrounds a molecule's nucleus.

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In the egg floating experiment, the independent variable is adding salt to the water, the dependent variable is the egg floating in the water and the control group is the beaker just with water.

The egg floating experiment is done to test the density of the egg with respect to the water. Generally, the egg sinks in the water as the egg has a higher density than water.

On the other hand, if salt is added to water to form a salt solution and if the egg is added to that solution, then the egg floats. This is because the density of the egg is lesser than the salt solution leading the egg to float.

Therefore, in this experiment, the independent variable is the amount of salt added to the water and the dependent variable is the egg floating in the water as it is dependent on the amount of salt added the water. Thus, the control group is the beaker with water.

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The thumbprint-shaped region on the pressure/enthalpy chart is called saturation curve

An enthalpy chart show the A/C cycle and at what temprature and pressure  the refrigerant changes from gas to liquid and back to gas and the vapor liquid saturation curve of the pure substances is important from both the practical and thermodynamic viewpoint because it provide basic information on the behavior of the fluid as well as on its properties and the loop is the most common type of fingerprint and the ridges form elongated loop and some people have double loop fingerprint

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The solubility product (Ksp) at the given temperature is 2.27×10⁻²⁴

We'll begin by writing the dissociation equation of aluminum hydroxide, Al(OH)₃. This is shown below:

Al(OH)₃(aq) <==> Al³⁺(aq) + 3OH⁻(aq)

Finally, we shall determine the solubility product (Ksp). This is illustarted below:

Ksp = [Al³⁺] × [OH⁻]

Ksp = 8.70×10⁻¹³ × 2.61×10⁻¹²

Ksp = 2.27×10⁻²⁴

Thus, we can coonclude that the solubility product (Ksp) is 2.27×10⁻²⁴

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Reaction will move forward and favor according to Le Chatelier's principle on increasing temperature of water.

According to Le Chatelier's principle, the position of equilibrium will shift if a system in a state of dynamic equilibrium is disturbed by a change in its conditions. The point of equilibrium will shift toward the products to offset the additional reactant if you raise the concentration of one of the reactants. For instance, extra N2 will react with H2 in the system if it is added. More ammonia will be produced as a result of this.

Similar to this, the location of equilibrium would move to the left if you reduced the concentration of one of the reactants. In this instance, removing N2 would cause more NH3 to break down into the reactants.

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Density=mass/volume

d=6.2/4.4

d=1.40 grams/cm³

2 NH3 + 3 CuO → 3 Cu + N₂ + H₂O in the equation the compounds that are on the left side were reactants and the compounds on the right side was products.

what is reactants and products?

Chemical reactions form and dissolve the chemical bonds that hold atoms together to form molecules. During a chemical reaction, the atoms are re organized; they become disengaged and reattached to one another in various ways, resulting in new compounds with diverse characteristics. Every chemical reaction has two parts:

Reactants – The beginning elements of a chemical reaction; what enters into the reaction

Usually written on the left side of a chemical reaction

Products — What is produced as a result of a chemical reaction.

Usually written on the right side of a chemical reaction.

among the given options the false statement was

H20 is a reactant was the false statement.

but the H2O was actually a product.

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Answer: CH3-CO-CH3<CH3-CH2-OH<CH3-COOH

Explanation:

basically the boiling point depends upon the intermolecular hydrogen bonding. thus alcohol tends to have a higher boiling points then ketones because they have -OH group unlike carbonyl.

In both plants and animals, the process of cellular respiration may be broken down into the following steps: Oxygen + carbon dioxide.

When plant cells undergo cellular respiration, oxygen is taken in through the plant's leaves from the surrounding atmosphere, and carbon dioxide is exhaled back into the atmosphere as a byproduct of the process. In contrast, when animal cells undergo cellular respiration, oxygen is taken in through the lungs, and carbon dioxide is exhaled through the lungs.

Therefore, a quick review, throughout the process of cellular respiration, plants and animals trade oxygen and carbon dioxide with one another.

Therefore, we may draw the following conclusion: Oxygen + carbon dioxide is a shorthand for the process of cellular respiration in plants and animals.

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Answer:

the same kind of atoms

Explanation:

the same kind of atoms