The temperature is obtained as 1517 K.
What is the temperature?We know that we asked here to find the temperature at which we are going to have a diffusion coefficient of 2.1 × 10−14 m2/s. Let us look at the following from the question;
D = diffusion coefficient = 2.1 × 10−14 m2/s
[tex]D_{o}[/tex] = pre-exponential constant = 1.1 × 10−5 m2/s
[tex]E_{a}[/tex] = Activation energy = 253,300 J/mol
R = Gas constant = 8.314 J/mol.K
T = temperature = ??
Then;
log D= log [tex]D_{o}[/tex] - Ea/2.303RT
log(2.1 × 10−14) = log( 1.1 × 10−5) - 253,300/2.303 * 8.314 * T
log(2.1 × 10−14) / log( 1.1 × 10−5) = - 253,300/2.303 * 8.314 * T
T = - 253,300/-8.719 * 2.303 * 8.314
T= 1517 K
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What effect do energy levels have on effective nuclear charge?
I need help with question 10 please
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
What is one way the concept of stability is seen in chemistry?
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.
The change in energy when reactants become products or G for the reaction is referred to as thermodynamic stability. Reactivity, or generally ligand substitution, is referred to as kinetic stability. In some situations, substitution happens relatively quickly, while in others, it happens quite slowly. Complexes of the first type are known as labile, whereas those of the second type are known as inert. These two forms of stability can sometimes be parallel to one another, but they are frequently not.The energetics and associated equilibrium constant for the reaction of an aquated metal ion with another ligand is frequently referred to as the reaction's "thermodynamic stability" (other than water). The stability constant () is equal to the instability constant reciprocated.Learn more about thermodynamic stability here:
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anyone???? Faraday second law of electrolysis
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."
How many grams of NCI3
are in 4.00 moles of NC13?
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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(6 pts) A compound was analyzed and found to contain 14.14% C, 2.38% H, and 83.48% Cl.
Determine the empirical formula for this compound.
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 number of elections represented by the following set of quantum numbers is?
n=2 l=1 ml=-1 ms= 1/2
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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Calculate the [OH−] and the pH of a solution with an [H+]=4.9×10−13 M at 25 °C .
[OH−]= M
pH=
Calculate the [H+] and the pH of a solution with an [OH−]=2.2×10−7 M at 25 °C .
[H+]= M
pH=
Calculate the [H+] and the [OH−] of a solution with a pH=8.66 at 25 °C .
[H+]= M
[OH−]= M
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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Explain the reaction between iodine solution and polysaccharides by giving the structures of related Compounds.
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.
Sol-There is no chemical reaction. Know the extent between to react to react and fair play mixing I too means iodine and potassium I Od um ordered solution solution and I could not React directly as such bad form poorly I owed eight iron like I five and I seven. They negatively charged iodide in the negatively charged how you died. All right, come and did come about charge donor. The neutral iodine charging accepted a solution of iodine, a solution of iodine and potassium iodide um added in water had the light orange brown color, light orange brown color, orange brown color. Once a mileage is added it from another city complex. When once a mileage in my load I added it from another city complex.
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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How many liters of gasoline contain 1.98kg of gasoline
Answer:1.4652
Explanation:
0.74g/ml
0.74x1.98
=1.4652
6. Paula does 8000 J of work pushing a wheelbarrow to her garden. If the distance she
moved the wheelbarrow is 25 m, what force did she use to move the wheelbarrow?
A. 80 N
B. 320 N
C. 8000 N
D. 200 000 N
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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Calculate the molar solubility of iron(II) hydroxide, Fe(OH)2, in a solution buffered at a pH of
13.15. The Ksp of Fe(OH)2 is 1.6 × 10−14.
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.
What is solubility?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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I need help on #10 please
Answer:
Na,Ba,Ti,on their placement on the periodic table...
A local AM radio station broadcasts at a frequency of 742 kHz.
Calculate the wavelength at which it is broadcasting.
Wavelength =
m
(1 kHz = 10 3 sec -1)
The wavelength of the wave is obtained as 0.4 m.
What is the wavelength of the broadcasting station?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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A heat lamp produces 26.0 watts of power at a wavelength of 6.0 μm .
How many photons are emitted per second? (1 W=1 J/s.)
Express your answer to three significant figures.
The number of photons that is emitted per second is 7.9 * 10^18 photons per second.
What is the number of photons emitted?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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Select the best answer for the question.
10. What's the structure of PF,? Is it polar or non-polar?
O A. Trigonal bipyramidal, non-polar
OB. Square pyramid, polar
O C. Square pyramid, non-polar
O D. Trigonal bipyramidal, polar
If 5 g of Al (26.98g/mol) reacts with 9 g of O2 (32 g/mol), how many grams of Al2O3 (101.56 g/mol) can be formed/
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.
What mass of aluminum oxide can be formed from the reaction between aluminum and oxygen?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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Explain how humans hear. Be sure to include the following terms in your response: outer ear, cochlea, eardrum, auditory nerve.
According to research, the ear is a complex organ that meets hearing, being of great importance to humans.
How humans hear?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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Arrange methanoic acid, methanol and methylamine in order of increasing boiling point
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.
The reaction for the combustion of propane is
C3H8+50₂ → 3 CO₂ + 4H₂O
ΔΗ = -526.3 kcal/mol
How much heat is released when 45.9 g of propane is burned?
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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Which of the following compounds dissolves in water?
CBr4
C6H6
CCl4
H2S
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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A 191 mL sample of a 1.3 M sucrose solution is diluted to 500 mL.
▼ Part A
What is the molarity of the diluted solution?
According to the given statement 0.49 M is the molarity of the diluted solution.
How do we calculate molarity?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.
Briefing: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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what product is formed when magnesium undergoes combustion?
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.
What is chemical reaction?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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425 L of chlorine at 32° C will occupy what volume at -15° C while the
pressure remains constant?
502.4 L
185.2 L
O 199.2 L
359.5 L
*
2 points
According to the solution 359.5 L volume at -15° C while the pressure remains constant.
What kind of force is pressure?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.
Briefing: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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C2H4O2 + 2 O2 --> 2 CO2 + 2 H2O
20.0 grams of C2H4O2 is reacted with 15.0 grams of oxygen. How many grams of carbon dioxide would be produced?
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 chemical equation below shows reactants and products.
6CO₂ +12H₂O+light + enzymes - C6H12O6 +602 + 6H₂O
Which statement is BEST supported by analyzing this equation?
A. CO, is made from the chemical reaction.
B. No new compounds are made from this reaction.
C. O,, oxygen gas, is needed to make the reaction start.
D. The atoms rearrange in the chemical reaction so that CeHuO.
glucose, is made.
Option D. The atoms rearrange in the chemical reaction so that glucose is made.
A chemical reaction is a manner in which one or extra substances, the reactants, are transformed into at least one or extra different materials, the goods. materials are both chemical factors or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create one-of-a-kind substances as merchandise.
Examples of chemical reactions in everyday life consist of photosynthesis, rust, baking, digestion, combustion, chemical batteries, fermentation, and washing with soap and water. Chemical reactions arise everywhere in the global around you, now not simply in a chemistry lab.
On the idea of the product fashioned, special forms of reactions are Combustion response, Decomposition response, Neutralization response, Redox response, Precipitation or Double-Displacement reaction, Synthesis response
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What is the energy of the light emitted from an atom if the excited electron absorbs a photon with a wavelength of 622 nm?
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.
What is energy of electron?
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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1. The symbol of an element represents one atom of that element.
e.g. Ca
= 1 calcium atom
a sample of an unknown gas has a volume of 8.00L at 1.00 atm and 25.0°C. How many moles of gas are present
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
A student claims that if the downward movement of an electron in a hydrogen atom from n = 6 to n = 2 emits a photon with a wavelength of 410 nm then the electron must absorb a photon with a wavelength of 410 nm to move from n = 2 to n = 6. Is the student correct? Justify your answer.
Since energy can neither be created nor destroyed, it follows that the wavelength that was absorbed by the electron is also emitted.
What is the Bohr model?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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