what is the wavelength of the photon emitted when the electron in a hydrogen atom makes a transition from the n

The activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

To find the activation energy (Ea) of the reaction, we can use the Arrhenius equation, which relates the rate constant (k) to the temperature (T) and activation energy. The Arrhenius equation is given by:

k = A * e^(-Ea/RT)

Where:

k is the rate constant

A is the pre-exponential factor (frequency factor)

Ea is the activation energy

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin

We have two sets of data:

At 600 K, k1 = 3.4 m^(-1)s^(-1)

At 750 K, k2 = 31.0 m^(-1)s^(-1)

Taking the natural logarithm (ln) of both sides of the Arrhenius equation, we can rearrange the equation to solve for the activation energy:

ln(k) = ln(A) - (Ea/RT)

We can create two equations using the given data:

ln(k1) = ln(A) - (Ea/(R * 600))

ln(k2) = ln(A) - (Ea/(R * 750))

Subtracting the second equation from the first eliminates the ln(A) term:

ln(k1) - ln(k2) = (Ea/R) * ((1/600) - (1/750))

Simplifying further:

ln(k1/k2) = (Ea/R) * ((750 - 600) / (600 * 750))

Now we can solve for Ea:

Ea = (R * (ln(k1/k2))) / ((750 - 600) / (600 * 750))

Using the given values and the appropriate units:

Ea = (8.314 J/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Converting the units from J to kJ:

Ea = (8.314 × 10^(-3) kJ/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Ea ≈ 71.46 kJ/mol

Therefore, the activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

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The acid-base reaction between triethanolamine and stearic acid involves the deprotonation of stearic acid by triethanolamine.

The amine group in triethanolamine acts as a base and abstracts a proton from the carboxylic acid group in stearic acid. This forms a carboxylate ion and a protonated triethanolamine molecule. Triethanolamine (TEA) is a tertiary amine with three hydroxyl groups. Stearic acid is a long-chain carboxylic acid. In the reaction, one of the hydroxyl groups in TEA acts as a base and deprotonates the carboxylic acid group in stearic acid. The lone pair of electrons on the nitrogen atom in TEA attacks the proton of the carboxylic acid group, breaking the O-H bond and forming a new C-N bond. This results in the formation of a carboxylate ion, where the oxygen of the carboxylic acid group gains a negative charge, and a protonated triethanolamine molecule, where the nitrogen gains a positive charge. The reaction can be represented using arrow-pushing notation to show the movement of electrons throughout the process.

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Answer:

11.0 dm³

Explanation:

From the question,

Applying

PV= nRT............... Equation 1

Where P = pressure of oxygen gas, V = volume of oxygen gas, n = number of moles of oxygen, R = molar constant, T = Temperature.

make V the subeject of the equation

V = nRT/P............. Equation 2

But,

Number of mole (n) = Mass of oxygen(m)/Molar mass of oxygen(m')

n = m/m'....................... Equation 3

Substitute equation 3 into equation 2

V = mRT/Pm'............. Equation 4

Given: T = 28°C = (28+273) = 301 K, P = 0.998 torr = (0.998×0.00131579) = 1.3132 atm, m = 18.4 g

Constant: R = 0.082 atm.dm³/K.mol, m' = 32 g/mol.

Substitute these values into equation 4

V = (301×18.4×0.082)/(32×1.3132)

V = 454.1488/42.0224

V = 10.81 dm³

V = 11.0 dm³

O2 is the correct answer.

Explanation:

On a magnetic susceptibility balance, the O2 species will have the strongest mass shift since stronger paramagnetic species will have a larger mass shift.

The oxygen atoms in the O2 species are paramagnetic because unpaired electrons rotate in the same direction, increasing the magnetic field force. As a result, the oxygen atoms with two unpaired electrons will exhibit the largest mass shift on a magnetic susceptibility balance.

The magnitude of the mass shift is -O2, which increases with species paramagneticity. The mass shift increases with species paramagneticity. Therefore, on a magnetic susceptibility balance, oxygen will have the highest mass shift since it has two unpaired electrons in the molecular orbital diagram.

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Replacement  reaction.

Given

A chemical reaction

AB + C → CB + A

Required

reaction type

Solution

There are several types of reactions that can occur

synthesis: 2 elements combine to form a single product

polymerization: monomers combine to produce a polymer

decomposition: One compound breaks down into 2 components

oxidation : a change in oxidation number

replacement can be divided into 2

single replacement if one element replaces the other elements of a compound

double replacement if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds

AB + C → CB + A

If we look at this reaction, element C replaces element A to form a new compound CB. So it is single replacement. But this reaction can also be said to be an oxidation-reduction reaction because there is a change in oxidation number

element A undergoes a reduction reaction

element C undergoes an oxidation reaction

So types of redox reactions can be combination, decomposition, displacement, combustion, and disproportion.

Answer:

oxidation

Explanation:

i passed and got 100%

Answer:

Five ( 5 ) is the correct answer

Answer: 0.834 L

Explanation:

Volume is the scalar quantity that is the space required by the solution or the substance. The volume required for the 146.3g of 3.00M NaCl is 0.834 L.

Molarity is the concentration of the solution and is given as the ratio of the moles and the volume of the solution. The volume of the solution or the solute is inversely proportional to the molarity of the substance.

Molarity is given as,

\(\rm Molarity (M) =\rm \dfrac{ Moles(n) }{\text{Volume in L}}\)

Here,

Molarity of sodium chloride = 3.00M

Mass of sodium chloride = 146.3g

Molar mass of sodium chloride = 58.44 g/mol

Substituting values in the equation:

\(\begin{aligned} \rm Molarity &= \rm \dfrac{mass}{Molar \;mass \times Volume}\\\\\rm V &= \dfrac{146.3}{ 58.44 \times 3.00}\\\\&= 0.8344 \;\rm L\end{aligned}\)

Therefore, the volume of the sodium chloride required is 0.834 L

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Answer:

The interference is 8

Explanation:

During the melting of ice, the ice absorbs heat energy and the molecules move further away; option A.

Melting refers to the process by which a solid substance changes to liquid when heat is added to it.

The melting of pure substances occur at a definite temperature called the melting point of that substance.

The molecules of a substance move further apart when they melt as the attractive forces between them are weakened.

The melting of ice is an example of the process of melting.

During the melting of ice, the ice absorbs heat energy and the molecules move further away.

In conclusion, melting of solids occur when heat is added to the solid.

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Answer:(a) electrons

(b) nucleus

(c) protons

(d) neutrons

(e) mass number

Explanation:

Answer:

Using the VSEPR theory, the electron bond pairs and lone pairs on the center atom will help us predict the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize attraction.

Explanation:

this from the internet

sorry if im wrong

The lone pairs and bond pairs in a molecule are used to determine the location of electron pair geometry around the molecule.

The geometry of a molecule refers to  the shape of the molecule. The geometry of a molecule is determined by the valence shell electron pair repulsion theory.

Now, we know that both lone pairs and bond pairs in the molecule are used to determine the electron domain geometry around the central atom as they take the most appropriate orientations in space to minimize electron pair repulsions.

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C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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The concentration of the HCl solution is calculated to be 0.0845 M using the formula M1V1 = M2V2.

The concentration of the HCl solution can be calculated using the formula M1V1 = M2V2, where M1 is the concentration of the NaOH solution, V1 is the volume of the NaOH solution, M2 is the concentration of the HCl solution, and V2 is the volume of the HCl solution.

Given:
M1 = 0.169 M
V1 = 12.5 mL
V2 = 25.0 mL

We need to find M2.

Rearranging the formula to solve for M2 gives us:

M2 = (M1V1)/V2

Substituting the given values into the formula gives us:

M2 = (0.169 M)(12.5 mL)/(25.0 mL)

M2 = 0.0845 M

Therefore, the concentration of the HCl solution is 0.0845 M.

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Answer:

3000 milligrams

Explanation:

to get milligrams you add 3 zero at the end

The types of alkyl halides that are capable of forming a carbocation include:

1. Primary alkyl halides (1°): These have the halogen atom bonded to a carbon that is bonded to only one other carbon atom.
2. Secondary alkyl halides (2°): These have the halogen atom bonded to a carbon that is bonded to two other carbon atoms.
3. Tertiary alkyl halides (3°): These have the halogen atom bonded to a carbon that is bonded to three other carbon atoms.

Tertiary alkyl halides are the most capable of forming carbocations due to their greater stability, followed by secondary and primary alkyl halides.

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3-ethyl-4,5-dimethyl-octane

Answer:it’s 12.8cm^2 and I saw that last anwser and he’s not wrong but yeah I had trouble figuring it out but it’s just force divided by area for both tires multiply that by 2

Explanation:

A bicycle weighs 780. pounds. If the pressure exerted by its tires on the ground is 30.5 pounds per square centimeter, the area of one of the two tires that's in contact with the road is 12.8cm².it’s just force divided by area for both tires multiply that by 2.

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is distributed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

Pressure is defined as force per unit area of surface; the SI unit of pressure is the pascal (Pa), which is defined as one newton per square metre (N/m2). An object's pressure is proportional to the force it exerts and inversely proportional to the area over which the force is exerted.

The physical force exerted on an object is defined as pressure. The force applied per unit area is perpendicular to the surface of the objects. F/A is the basic pressure formula (Force per unit area).

Thus, the area of one of the two tires that's in contact with the road is 12.8cm².

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The empirical formula of compound that contains 4. 03g of hydrogen per mole, 64. 14 g of sulfur per mole and 128 g of oxygen per mole is H₂SO₂.

given that :

mass of hydrogen = 4.03 g

mass of sulfur = 64.14 g

mass of oxygen = 128 g

moles of hydrogen = mass / molar mass

                                = 4.03 / 1

                                = 4mol

moles of sulfur = 64.14 / 32

                         = 2 mol

moles of oxygen = 128 / 32

                            = 4 mol

dividing by the smallest one , we get

mole of H = 2

mole of S = 1

mole of O = 2

The empirical formula = H₂SO₂

Thus,  the empirical formula of compound that contains 4. 03g of hydrogen per mole, 64. 14 g of sulfur per mole and 128 g of oxygen per mole is H₂SO₂.

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2Na + MgF2 → 2NaF + Mg

Tetrodotoxin (TTX) specifically affects voltage-gated sodium channels.

These channels are responsible for the generation and propagation of action potentials in excitable cells, including neurons and muscle cells. TTX binds tightly to a specific site on the outside of the sodium channel, blocking the movement of sodium ions through the channel pore.

By blocking sodium channels, TTX prevents the influx of sodium ions into cells during depolarization, effectively inhibiting the generation and propagation of action potentials. This leads to the disruption of normal electrical signaling in excitable tissues, resulting in various physiological effects depending on the affected tissues.

Due to its potent inhibitory effects on sodium channels, TTX is known for its use as a toxin, primarily found in pufferfish and certain other marine organisms. Ingesting TTX-contaminated seafood can lead to severe poisoning, characterized by paralysis, respiratory failure, and potentially fatal consequences.

Research on TTX and its interactions with sodium channels has also provided valuable insights into the function and structure of these channels, contributing to our understanding of electrical signaling in cells and the development of drugs targeting sodium channels for therapeutic purposes.

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ANSWER

The addition of KSCN to the system will shift the arrow to the product sides

EXPLANATION

Firstly, we need to define the term chemical equilibrium.

Chemical equilibrium can be defined as the state in which the reactants and the products are present in concentration and do not have a tendency to change with time.

To determine the shift of the chemical equilibrium in the reaction provided, state the le Chatelier's principle

Le Chatelier's principle states that when external constraints such as temperature, pressure, concentration, etc system in chemical equilibrium, the equilibrium arrow shifts so as to annul the effect of the external constraints.

From the reaction provided

The above equation shows that the reaction is an exothermic reaction because heat is liberated to the surroundings.

When one of the reactants is supplied to the system constantly, more of its product is formed. Hence, the equilibrium arrow shifts to the right-hand side of the reaction.

Hence, the addition of KSCN to the system will shifts the arrow to the product sides

To determine the mass percent of chloride in the original sample, we need to first calculate the amount of chloride present in the sample. We can do this by using the balanced equation for the reaction between chloride and silver nitrate:

AgNO3 + Cl- → AgCl + NO3-

First, we need to calculate the number of moles of silver nitrate used in the titration:

moles of AgNO3 = volume (L) x molarity (M) = 0.03083 L x 0.7890 M = 0.02439 moles

Next, we can use the balanced equation to find the number of moles of chloride:

moles of Cl- = moles of AgNO3 = 0.02439 moles

Finally, we can use the number of moles of chloride to calculate the mass of chloride in the sample:

mass of Cl- = moles of Cl- x molar mass of Cl- = 0.02439 moles x 35.5 g/mol = 0.868 g

To find the mass percent of chloride in the original sample, we divide the mass of chloride by the total mass of the sample and multiply by 100%.

mass percent of Cl- = (mass of Cl- / total mass of sample) x 100%

Since we don't know the total mass of the sample, we can use the mass of chloride we just calculated and the formula above to find the mass percent of chloride in the original sample.

mass percent of Cl- = (0.868 g / 0.1599 g) x 100% = 54.3%

So, the mass percent of chloride in the original sample is 54.3%.

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Answer:

500

Explanation:

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The pressure of 0.650 atm numerically in milimeters of mercury is 494 mmHg. 1 atm is equivalent to 760 mmHg.

There are several pressure units. They are atm, mmHg, torr, Pa, and psi. The equivalent standard pressures are as follows:

1 atm = 760 mmHg = 760 torr = 101,325 Pa = 14.7 psi

What is 0.650 atm of pressure if it is converted to milimeters of mercury?

1 atm = 760 mmHg

0.650 atm = 0.650 × 760 mmHg

0.650 atm = 494 mmHg

Hence, the pressure numerically in milimeters of mercury is 494 mmHg.

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Answer:

C) Highly reactive

Explanation:

An atom with one or two valence electrons more than a closed shell is highly reactive, because the extra valence electrons are easily removed to form a positive ion

According to the electronic configuration, an atom that has one or two valence electrons is most likely to be highly reactive  as it can easily loose 1 or 2 electrons.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

Water is a polar covalent compound since it has Oxygen and Hydrogen which are 2 non-metals and the atoms have an unequal distribution of charge.  Oxygen has δ- since it is more electronegative and Hydrogen has δ+. The shape of the water molecule is not symmetrical and dipoles are cancelled out making it a polar covalent compound.

Answer:

it is colourless

Explanation:

its tastleś

Answer: 100, less

Explanation:

The total yearly precipitation for elkhart kansas is attached in the form of graph below.

Precipitation is defined as any liquid or frozen water which forms in the atmosphere and then gets received on Earth.It is one of the most important steps of the water cycle.

Precipitation takes place in form of clouds when water vapor gets accumulated in clouds and they get bigger and heavy, when the clouds become heavy enough they fall to the land in the form of rain.f a cloud is present at higher altitudes , the water present in the clouds freezes and fall to the ground in form of snow,hail.

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The selection from the section that provides further support for the claim is that B. Food, energy, medicine, water, protection from storms and floods and slowing climate change are some of the 18 ways nature helps keep people alive, the report said.

Selection 2, "Food, energy, medicine, water, protection from storms and floods and slowing climate change are some of the 18 ways nature helps keep people alive, the report said." provides further support for the claim that humans need nature.

It lists several specific ways in which nature is essential for human existence and good quality of life, and it is align with the statement "Nature is essential for human existence and good quality of life," the report said. Additionally, it provides an estimation of 18 ways which nature helps human to survive, adding more weight on the statement.

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