Can anyone help me in this question? (Q13 part A, B, and C)

To solve such this we must know the concept of combustion reaction. Combustion reaction happens in presence of oxygen. Magnesium oxide is  formed when magnesium undergoes combustion.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

When magnesium undergoes combustion, the magnesium oxide is formed.

2Mg+O₂[tex]\rightarrow[/tex]2MgO

Therefore, magnesium oxide is  formed when magnesium undergoes combustion.

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The wavelength of the wave is obtained as 0.4 m.

The wavelength has to do with the distance that have been covered by the wave. In this case, we can use the frequency of the wave that have been supplied in the question and the speed of light which is a constant to be able to obtain the wavelength of the wave.

Knowing that;

wavelength = speed of light/frequency

speed of light = 3 * 10^8 m/s

Frequency = 742 * 10^3 Hz

wavelength =  3 * 10^8 m/s/ 742 * 10^3 Hz

= 0.4 m

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Answer:

0.3269

Explanation:

You would use the ideal gas law along with the equation Pv=nrt when P is pressure, v is volume, n is the moles of gas you are solving for, r is a constant that is , and t is temperature,

So you are given pressure, volume, and temperature, so you would begin by plugging in your known values:

P = 1atm

V = 8.00 L

T = 298 K ( but you usually want to use Kelvin so you would add 273.15; this is because 0 C is 273.15 K and 25+273=298)

(1)(8)=n(0.0821)(298)

then

8=n(24.4658)

next isolate n by dividing 24.4658 on each side

8/24.4658 = n (24.4658/24.4658)

0.3269=n(1) or n

The solubility of solute in a solution can be find out from the solubility constant Ksp and molar concentrations. The solubility of iron hydroxide in the solution is 3.19 ×10 ⁻¹⁶ M.

Solubility of substance is the fraction of its concentration which dissolves in a solvent at a specific temperature. The solubility constant Ksp is the product of molar concentrations of the ions in the solute.

It is given that the pH of the solution is 13.15. Thus, pOH = 14 -13.15 = 0.85.

[OH-] = Antilog (pOH) = antilog (0.85)

         = 7.07 M.

The solute Fe(OH)₂ dissociates into Fe²⁺ ion and 2 OH- ions. Let s be the solubility of one mole of ion. Thus [Fe²⁺] = s. Then, the Ksp can be written as follows:

Ksp = [Fe²⁺] [OH-]²

 1.6 × 10⁻¹⁴  = s  × [7.07 M]²

   s =   1.6 × 10⁻¹⁴/[7.07 M]²

      =  3.19 ×10 ⁻¹⁶ M.

Therefore, the molar solubility of iron(II) hydroxide in the given solution is  3.19 ×10 ⁻¹⁶ M.

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The number of electrons represented by the following quantum numbers is 1 electron

The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers. There are four quantum numbers, namely, principal (n), azimuthal (l), magnetic(m) and spin quantum numbers (s). The values of the conserved quantities of a quantum system are given by quantum numbers.

According to the data given, n=2 which means the shell number is 2, l =-1 means its the subshell is p and only one orientation, which can accomodate maximum of 2 electrons, but as the ms = 1/2 so we are here talking about just one electron with a +1/2 spin

Therefore with the above given quantum number the electron represented is one

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The empirical formula for this compound is CH₂Cl₂.

C = 14.14% / 12 = 1.17

H = 2.38% / 1 = 2.38

Cl = 83.48% / 35.5 = 2.35

Now, divide by 1.17

C = 1.17 / 1.17 = 1

H = 2.38 / 1.17 = 2

Cl = 2.35 / 1.17 = 2

Therefore, The empirical formula for this compound is CH₂Cl₂.

In chemistry, the  empirical formula of a chemical compound is the best entire variety ratio of atoms found in a compound.

There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas display the best whole-range ratio of atoms in a compound, molecular formulas show the quantity of every kind of atom in a molecule, and structural formulas display how the atoms in a molecule are bonded to every different.

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The mass of NCl3 in 4.00 moles of NCl3 is 481.44 grams

Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g. The number of particles present in one mole of any substance =Avogadro Number=6.

The formula for number mole is given as:

Number of moles =  Mass of the substance ; Now substituting the values

                                   Molar mass

⇒ 4.00 =  x                               [Molar mass of NCl3 = 120.36]

               120.36

⇒ x = 4.00 × 120.36

⇒ x = 481.44 grams

Therefore the mass of NCl3 is 481.44 grams

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The number of photons that is emitted per second is 7.9 * 10^18 photons per second.

We know that the photons have to do with the particles of light that are in motion. Now, we know that the power that is being produced by the heat lamps have been obtained as 26.0 watts. It is also know that this could be written as 26 J/s.

We now have to find the energy of the photons;

Wavelength of the photons = 6.0 μm or 6 * 10^-6 m

Plank's constant = 6.6 * 10^-34 Js

Speed of light = 3 * 10^-10 m/s

Now, we have

E = 6.6 * 10^-34 * 3 * 10^-10 /6 * 10^-6

E = 3.3 * 10^- 18 J

We have;

26 J/s * 1 photon/ 3.3 * 10^- 18 J

= 7.9 * 10^18 photons per second.

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According to research, the ear is a complex organ that meets hearing, being of great importance to humans.

Hearing is a physiological process where sound waves, which are vibrations, enter through the outer ear and reach the middle ear, causing the eardrum to vibrate.

In this sense, the vibrations, in turn, cause the movement of small bones called stirrup, anvil and malleus, where they reach the organ of Corti, stimulating the auditory nerve and finally become nerve impulses that reach the brain.

Therefore, we can conclude that according to research, hearing is a process that implies that sound waves first impact the eardrum until finally reaching the auditory centers of our brain.

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According to the given statement 0.49 M  is the molarity of the diluted solution.

Molarity (M), which is calculated by dividing the solute's weight in moles by the the solution's volume in liters, is the most widely used unit to express solution concentration: litres of solution/moles of solute equals M.

Utilizing the dilution law equation

M₁V₁ = M₂V₂

Where

M₁ is the initial molarity

V₁ is the initial volume

M₂ is the final molarity

and V₂ is the final volum

From the given information,

M₁ = 1.3 M

V₁ = 191 mL

V₂ = 500.0 mL

The result of entering the parameters into the formula is

1.3  * 191 = M[tex]_2[/tex] * 500

M[tex]_2[/tex]  = 1.3 * 191 / 500

M[tex]_2[/tex] = 248.3/500

M[tex]_2[/tex] = 0.4966 M

M[tex]_2[/tex] ≅ 0.49 M

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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.

Since energy can neither be created nor destroyed, it follows that the wavelength that was absorbed by the electron is also emitted.

We know that the Bohr model posses the idea that an electron could move from a lower to higher energy level by the absorption of a photon of light. Thus we know that, when we supply energy to the electron, it is that energy that leads to the electronic transition.

It is clear that the energy that the electron has taken in when it moves up is the same as the energy that it would give out when it comes down in accordance with the law of conservation of energy.

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Answer:

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

15g of CO2 will be produced from 15g of O2  as 2 moles of O2 produces 2 moles of CO2

What is moles ?
In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles.

The mole designates 6.02214076 1023 units, which is a very large number. For the International System of Units (SI), the mole is defined as this number as of May 20, 2019, according the General Conference on Weights and Measures. The number of atoms discovered through experimentation to be present in 12 grams of carbon-12 was originally used to define the mole.

C2H4O2 + 2 O2 --> 2 CO2 + 2 H2O

2 unit of O2 produces 2 unit of CO2

15g of O2 produces 15g of CO2

15g of CO2 will be produced from 15g of O2  as 2 moles of O2 produces 2 moles of CO2

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The explanation of the reaction between the compounds is here.

What is compound?

A thing that is composed of two or more separate elements is called compound.

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When once a mileage in my load I added it from another city complezx.. The police have cried. The police had cried, the police have cried act as a George donor charges and the police have died. And the poly iodide act as a except her. The new council looks absorbing light of a different wavelength than polly iodide and the color turn dark dark blue. The object structure are poorly added inside the am I late helix Alex is not clear. Are bulky and sit inside the policy crowds of glucose units and could not get out of date.

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Heat is released when 45.9 g of propane is burned is - 547.352 kcal

Given that :

ΔH = - 526.3 kcal/mol

mass = 45.9 g

molar mass = C₃H₈

                    = 12 × 3 + 8 × 1

                   = 44 g / mol

The reaction is given as :

C₃H₈   +   5O₂    ----->     3CO₂    +   4H₂O

number of moles = mass / molar mass

                            = 45.8 / 44

                             = 1.04 mol

ΔH = Q / n

where ,

Q = heat

n = number of moles

Q = ΔH × n

   = - 526.3 × 1.04

Q     = - 547.352 kcal

Thus, The reaction for the combustion of propane is :

C₃H₈   +   5O₂    ----->     3CO₂    +   4H₂O

Heat is released when 45.9 g of propane is burned is - 547.352 kcal

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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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According to the solution 359.5 L volume at -15° C while the pressure remains constant.

The definition of force in physics is The push or pull on a massed object alters its velocity. An external factor is an agent that has the power to alter the resting or moving condition of a thing. It has a path and a magnitude.

Initial volume of chlorine gas = 425 L

Initial temperature = 32°C

Final volume = ?

Final temperature =  -15°C

Solution

Initial temperature = 32°C (32+273 = 305 K)

Final temperature =  -15°C (-15 +273 = 258 K)

The Charles Law will be used to resolve the presented issue.

This equation states that at constant pressure and molecular number, the volume of a given amount of a gas is precisely proportional to its temperature.

V₁/T₁ = V₂/T

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume

T₂ = Final temperature

We will now enter the values into the formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 425 L× 258 K /305 K

V₂ = 109650 L.K / 305 K

V₂ = 359.5 L.

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Answer:

Na,Ba,Ti on the same base placement on the periodic table.

Answer:

O,S,Se

Explanation:

Because they lose electrons and become an anion to become ionicly bonded and they are in the same period

Stability can be seen in chemistry through thermodynamics or kinetic stability.

There are two possible meanings of stability when it refers to coordination compounds (metal complexes): kinetic stability or thermodynamic stability.

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Answer:1.4652

Explanation:

0.74g/ml

0.74x1.98

=1.4652

Explanation:

E =hv

= h*3*10power8meterpersecond ÷6.22*10power of -7m

where h is planks constant

Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

An electron's energy is determined by where it is in relation to the atom's nucleus. The distance an electron in an atom has to travel from the nucleus depends on its energy level.

The mass of an electron is roughly 1/1836 that of a proton. The intrinsic angular momentum (spin) of the electron is given in units of the decreased Planck constant and has a half-integer value.

Energy has a negative sign, meaning that an electron is drawn to the nucleus. The electron has the least energy in the first orbit, and as n grows, or as it gets less negative, the electron's energy increases.

Therefore, Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

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It is expedient that Asim put some few pancreatic blood in a test tube to test for the functioning of digestive enzymes produced by the pancreas.

When someone is considering the purpose of digestive enzyme experiments, it should be what is given below:

Objectives:

That being said, enzymes are organic, biological or biochemical catalysts which speed up the rate of chemical reactions. Within the context of the task given above, digestive enzymes help to speed up the digestion of food substances. In order to confirm why this substance stopped working, a pancreatic blood test needs to be done in a test tube to confirm the reasons why the substance stopped working.

However, some of the reasons why digestive enzymes stopped working include the following:

So therefore, screening for pH, concentration and temperature of the digestive enzyme can used to test for inactivity of enzymes.

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Based on the mole ratio of the reaction, the mass of aluminum oxide that is produced from the reaction between 5 g of aluminum and 9g of oxygen is 9.39 g.

The mass of aluminum oxide that can be formed from the reaction between aluminum and oxygen is determined from the limiting reactant and the mole ratio of the reaction.

The mole ratio of the reaction is as given in the equation of the reaction below:

2 Al (s) + 3 O₂ (g) ----> Al₂O₃ (s)

The mole ratio of Al to O = 2 : 3

Moles of Al present = 5/27

Moles of Al present = 0.185 moles

Moles of O present = 9/32

Moles of Al present = 0.281 moles

Al is the limiting reactant

Mole ratio of Al to Al₂O₃ = 2 : 1

Mass of Al₂O₃ produced = 0.185/2 * 101.56

Mass of Al₂O₃ produced = 9.39 g

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The amount of force will be 320 N.

Force can be defined as the ratio of work and distance. The unit of the force will be Newton.  It can be represented by N. There are various type of force and they are tension force and frictional force.

The given data:

W = 8000J

d = 25m

The relation between the force, distance and work can be expressed as:

W = f×d....(i)

Put the given data in equation (i).

8000 J = f × 25m

f = 8000/25

f = 320 N

Therefore, the force will be 320 N.

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The [OH⁻] concentration is  1.9 × 10⁻² M and the  [H⁺] concentration is 3.9 × 10⁻⁸ M

a) [ H⁺ ] = 4.9 × 10⁻¹³ M

pH = - log [ 4.9 × 10⁻¹³ ]

pH = 12.3

pH + pOH = 14

pOH = 14 - 12.3 = 1.7

pOH = -log [OH⁻]

[OH⁻] = 10^-1.7

         = 1.9 × 10⁻² M

b) pOH = - log [ 2.2 × 10⁻⁷]

pOH = 6.6

pOH + pH = 14

pH = 7.4

pH = -log [H⁺]

[H⁺] = 10^-7.4

[H⁺] = 3.9 × 10⁻⁸ M

Thus, The [OH⁻] concentration is  1.9 × 10⁻² M and the  [H⁺]  concentration is 3.9 × 10⁻⁸ M

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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."