Applying the Bohr model to a triply ionized beryllium atom (Be3+,Z=4) , find the shortest wavelength (nm) of the Lyman series for Be3+ .
Express your answer using four significant figures. ( my answer was 11.42 nm and is wrong)

Answers

Answer 1

To find the shortest Applying the Bohr model wavelength of the Lyman series for a triply ionized beryllium atom (Be3+, Z = 4) using the Bohr model, we can use the Rydberg formula:

1/λ = RZ^2 (1/n1^2 - 1/n2^2)

where λ is the wavelength, R is the Rydberg constant (approximately 1.097 × 10^7 m^-1), Z is the atomic number, and n1 and n2 are the principal quantum numbers of the initial and final energy levels, respectively.

For the Lyman series, the final energy level (n2) is always 1. Therefore, we can rewrite the formula as:

1/λ = RZ^2 (1/n1^2 - 1)

Since we're looking for the shortest wavelength, we need to find the transition with the largest n1 value. In this case, n1 would be the largest possible value before reaching the ionization level. Since beryllium is a Group 2 element, it loses its two valence electrons to form a +2 ion. Therefore, the highest possible energy level for the remaining electron is n1 = 3

1/λ = R(4^2) (1/3^2 - 1/1^2)

1/λ = 16R (1/9 - 1)

1/λ = 16R (1/9 - 9/9)

1/λ = 16R (-8/9)

1/λ = -128R/9

λ = -9/128R

Using the given value for the Rydberg constant, we have:

λ = -9/128 * (1.097 × 10^7 m^-1)^-1

Calculating this expression gives us approximately -0.000064994 m^-1. However, a negative wavelength doesn't make sense, so it seems there may be an error in the calculations. Please double-check the values and calculations you used to determine the wavelength of 11.42 nm.

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Related Questions

3.4
Why is this cocktail not the perfect medication to treat infections by these
bacteria?​

Answers

Answer:

many bacteria are resistant to penicillin and other β-lactam antibiotics - some bacteria have beta-lactamase enzymes and are able to break down the antibiotics - as a result, many drugs are combined with other drugs that are β-lactamase inhibitors.

Explanation:

Quizlet

which of the following is true of carbon? select all that are correct. group of answer choices it can form a maximum of four covalent bonds with other elements. it can form a maximum of three covalent bonds with other elements. it is highly electronegative. it can form both polar and nonpolar bonds. it can only form polar molecules.

Answers

Based on the given options, the following statements are true of carbon: It can form a maximum of four covalent bonds with other elements and It can form both polar and nonpolar bonds.

Carbon is an element with atomic number 6, meaning it has six protons in its nucleus. It has four valence electrons, which are the electrons involved in bonding with other atoms.

Carbon's electron configuration allows it to form four covalent bonds by sharing its valence electrons with other atoms. This property is known as tetravalency and is a fundamental characteristic of carbon.

Additionally, carbon can form both polar and nonpolar bonds depending on the atoms it is bonded to and the electronegativity difference between them.

When carbon bonds with atoms of similar electronegativity, such as hydrogen, the bond is nonpolar because the electrons are shared equally. However, if carbon bonds with atoms of higher electronegativity, such as oxygen or nitrogen, the bond becomes polar due to the unequal sharing of electrons.

In summary, carbon can form a maximum of four covalent bonds with other elements due to its tetravalent nature. It is not highly electronegative itself but can form both polar and nonpolar bonds depending on the atoms it is bonded to. Therefore, the correct statements are:

It can form a maximum of four covalent bonds with other elements.

It can form both polar and nonpolar bonds.

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which step in glycolysis involves the process where direct substrate phosphorylation occurs? (a) 3- phosphoglycerate to phosphoenolpyruvate (b) 1,3, bisphosphoglycerate to 3-phosphoglycerate and phosphoenolpyruvate to pyruvate (c) fructose-6-phosphate to fructose1,6-bisphosphate (d) 3- phosphoglycerate to 2-phosphoglycerate and phosphoenolpyruvate to pyruvate

Answers

The correct option is (b) 1,3, bisphosphoglycerate to 3-phosphoglycerate and phosphoenolpyruvate to pyruvate is the step in glycolysis involves the process where direct substrate phosphorylation occurs.What is glycolysis?Glycolysis is the metabolic pathway that breaks down glucose to pyruvate.

The glycolytic pathway converts glucose into two molecules of pyruvate and yields two ATP and two NADH molecules for each glucose molecule that enters the process.The series of reactions of glycolysis are divided into two main phases: an energy-investment phase, in which energy is consumed, and an energy-payoff phase, in which ATP is created. The first energy-investment phase is phosphorylation of glucose into glucose-6-phosphate, which is followed by phosphorylation of fructose-6-phosphate into fructose-1,6-bisphosphate.The direct substrate phosphorylation is the process where a substrate or molecule is phosphorylated via the transfer of a high-energy phosphate molecule directly from a phosphorylated intermediate (substrate-level phosphorylation).1,3-bisphosphoglycerate to 3-phosphoglycerate and phosphoenolpyruvate to pyruvate are steps in glycolysis that involve the process where direct substrate phosphorylation occurs.

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If a calorimeter used for an experiment had been made out of a heat-conducting material, such as metal, rather than styrofoam, a non-heat conducting metal, would the measured calorimeter constant be larger or smaller? Explain your answer.

Answers

If a calorimeter made of a heat-conducting material, such as metal, is used instead of a non-heat conducting material like Styrofoam, the measured calorimeter constant would be smaller. This is because a calorimeter made of a heat-conducting material would allow heat to be transferred more efficiently between the system being studied and the surroundings, resulting in less heat being absorbed by the calorimeter itself.

When conducting experiments involving heat transfer, a calorimeter is used to measure the heat exchanged. The calorimeter constant represents the amount of heat absorbed or released by the calorimeter for a given temperature change. A calorimeter made of a heat-conducting material, like metal, would conduct heat more effectively from the system to the surroundings. This means that a larger proportion of the heat generated by the system would be transferred away from the calorimeter, resulting in less heat being measured by the calorimeter itself. Consequently, the measured calorimeter constant would be smaller compared to using a non-heat conducting material like Styrofoam, where more heat would be retained within the calorimeter.

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The elements C and Se have the same electronegativity value, 2.55. Which of the following claims about the compound that forms from C and Se is most likely to be true?
a. The compound is likely to be an ionic compound.
b. The compound is likely to be a covalent compound.
c. The compound is likely to be a metallic compound.
d. The compound is likely to be an organic compound.

Answers

Carbon (C) and Selenium (Se) having the same electronegativity value of 2.55 is likely to form a (b) covalent compound.

An electronegativity value is the measure of the ability of an atom to attract shared electrons towards itself when they are chemically bonded with another atom.

Brief Information about C and Se:

Carbon (C) - Carbon is the 6th element on the periodic table. It is a non-metallic element that can be found in all known life forms. Carbon has 4 valence electrons, and it can either lose or share electrons to attain a stable electron configuration.

Selenium (Se) - Selenium is a non-metal element that belongs to group 16 of the periodic table. It has 6 valence electrons, and it can either lose or share electrons to attain a stable electron configuration. It is not found in its elemental form in nature and it is found in trace amounts in soils, rocks, and water.

Based on the above information, the following claim about the compound that forms from C and Se is most likely to be true: Option b. The compound is likely to be a covalent compound.

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Which are characteristics of all metals?
A
They are malleable, ductile, and conduct electricity.
B
They are malleable, ductile, and form ionic bonds.
C
They are ductile, inert, and conduct electricity.
D
They are noble, ductile, and form ionic bonds.

Answers

Answer:

A. They are malleable, ductile, and conduct electricity.

Explanation:

Answer:

a

Explanation:

Compute the percentage of error to the nearest tenth in the student’s calculation if the actual specific heat value for aluminum is 0.9J:g*C.

Answers

Complete Question:

1. A block of aluminum with a mass of 140 g is cooled from 98.4°C to 62.2°C with a release of 4817 J of heat. From these data, calculate the specific heat of aluminum.

a. Compute the percentage of error to the nearest tenth in the student's calculation if the actual specific heat value for aluminum is 0.9 J/g°C

Answer:

Percent error = 55.56 %

Explanation:

Given the following data;

Mass = 140 grams

Initial temperature = 62.2°C

Final temperature = 98.4°C

Quantity of heat = 4817 Joules.

To find the specific heat capacity;

Heat capacity is given by the formula;

[tex] Q = mcdt[/tex]

Where;

Q represents the heat capacity or quantity of heat. m represents the mass of an object. c represents the specific heat capacity of water. dt represents the change in temperature.

dt = T2- T1

dt = 98.4 - 62.2

dt = 36.2°C

Making c the subject of formula, we have;

[tex] c = \frac {Q}{mdt} [/tex]

Substituting into the equation, we have;

[tex] c = \frac {4817}{140*36.2} [/tex]

[tex] c = \frac {4817}{5068} [/tex]

Specific heat capacity, = 0.95 J/g°C

b. To find the percentage error;

Given the following data;

Actual specific heat capacity = 0.9 J/g°C

Experimental specific heat capacity = 0.95 J/g°C

Percent error can be defined as a measure of the extent to which an experimental value differs from the theoretical value.

Mathematically, it is given by this expression;

[tex] Percent \; error = \frac {experimental \;value - actual \; value}{ actual \;value} *100[/tex]

Substituting into the formula, we have;

[tex] Percent \; error = \frac {0.95 - 0.9 }{ 0.9} *100[/tex]

[tex] Percent \; error = \frac {0.5}{0.9} *100[/tex]

[tex] Percent \; error = 0.5556 *100[/tex]

Percent error = 55.56 %

Consider the four weak bases listed below. Which would primarily exist as a cation in an aqueous solution with pH = 9? a) only aniline, Kb = 4.0 x 10-10, pKa = 4.60 b) only caffeine, Kb = 1.4 x 10-4, pKg = 10.1 c) none will be cationic d) only quinine, Kb = 3.3 x 10-6, pKa = 8.52 e) only morphine, Kb = 1.6 x 10-6, pkg = 8.20 f) all will be cationic

Answers

When an aqueous solution has a pH value of 9, the solution is basic. It is important to note that weak bases behave like weak acids, producing their corresponding conjugate acid in the presence of water.

When a base interacts with water, it accepts a hydrogen ion to form the conjugate acid of the base. This conjugate acid can either exist in solution as a neutral species, as an anion, or as a cation. An anion is formed when a strong acid reacts with a weak base and displaces the weak base's conjugate base. Consider the four weak bases listed below. Which would primarily exist as a cation in an aqueous solution with pH = 9?

a) Aniline with Kb = 4.0 x 10-10 and pKa = 4.60
Aniline is a weak base that will primarily exist in a cationic state in an aqueous solution with a pH of 9. Aniline's Kb value is small, indicating that it is a weak base. Aniline's conjugate acid is NH2+, which is a weak acid.

b) Caffeine with Kb = 1.4 x 10-4 and pKg = 10.1
Caffeine is a weak base that will primarily exist in an anionic state in an aqueous solution with a pH of 9. Caffeine has a Kb value that is relatively large, indicating that it is a weak base. The conjugate acid of caffeine is H+, which is a strong acid.

c) None of the above weak bases will be cationic in solution.

d) Quinine with Kb = 3.3 x 10-6 and pKa = 8.52
Quinine is a weak base that will primarily exist in a cationic state in an aqueous solution with a pH of 9. Quinine has a Kb value that is small, indicating that it is a weak base. The conjugate acid of quinine is NH+2, which is a weak acid.

e) Morphine with Kb = 1.6 x 10-6 and pkg = 8.20
Morphine is a weak base that will primarily exist in a cationic state in an aqueous solution with a pH of 9. Morphine has a Kb value that is small, indicating that it is a weak base. The conjugate acid of morphine is NH+2, which is a weak acid.

f) All weak bases will not be cationic in solution.

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Write the formula for Zn+2 (SO4)-2

Answers

Answer:

Zn2 + SO4 = Zn2(SO4)2

Explanation:

Minerals are formed by which process? O magma cooling O fault lines moving O metamorphosis O sedimentation​

Answers

i’m pretty sure it’s magma cooling. sorry if i’m wrong. also anytime someone says to click a link, don’t click it they are scamming

Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?

Answers

Answer:

The density is 7 g/cm^3

Explanation:

The formula for density is p=m/V. Where p is the density, m is mass, and V is the volume. 14/2=7.

Jet streams can cause warmer air temperatures on coastal land areas when
A. a cold jet stream occurs

B. a warm jet stream occurs

C. the tide changes direction

Answers

C I think hop this helped

Jet streams can cause warmer air temperatures on coastal land areas when the tide changes direction.

What are jet streams?

Jet streams are short bands of high wind that travel across the globe from west to east.

On earth, the location of the jet stream is in the latitude of the tropopause.

Two polar jet streams are present near the north and south poles.

Two subtropical jet streams are present, closer to the equator,

These make the Earth's four principal jet streams.

Thus, the correct option is C.

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Select the correct answer.
What data points do we combine to make the integrated rate law?

a) initial concentration and time

B) concentration at some later time, time, and rate constant

C) initial concentration, concentration at some later time, and time

D) initial concentration, concentration at some later time, time, and rate constant

Answers

Answer:

b???

Explanation:

Answer:

Pretty sure it A.

Explanation:

I just thought that cause what exactly does 'some later time' mean?

Question 19 (3 points)

If the density of the earth was 11.0 g/mL instead of its measured value of 5.51 g/mL, the force of gravity would

be twice what it is at sea level. If the earth's density was twice than its actual density, then in pounds per

square inch at sea level the earth's atmosphere in British units would be equal to:

a) 7.35 psi b) 14.7 psi c ) 29.4 psi d) 44.1 psl e) 98.8 psi

Answers

Answer:

c ) 29.4 psi

Explanation:

If the density of earth was twice than its actual density which is 5.51 g/mL, then at sea level the atmospheric pressure of earth in British units would be equal to 29.4 psi because increase of gravity, increase occurs in the atmospheric pressure.  If we double the gravity of earth by double of the earth density, so the weight of that same mass of air will be double which leads to the doubling of the atmospheric pressure at the sea level.

How many moles is 80.0 g of calcium?

Answers

Answer:

Here we were given the weight of Ca as 80g

and the atomic mass of carbon is 40u(molar mass)

using the formula

n=W/M

where w is weight and m is molar mass

80/40

=2

therefore, there are 2 moles in 80g of calcium

What is the standard units of mass, length and time in the (a) CGS system (b) SI system​

Answers

Explanation:

a. CGS system: centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time

b. SI system: metre as the unit of length, the kilogram as the unit of mass, and the second as the unit of time

Answer : the most common units of mass are the gram and kilogram.
And length and time in Seconds.

full form of CGS is:

. Centimetre

. Gram

. Second

This can be converted in terms of SI unit and then cgs unit as: (physical quantity, si unit, cgs unit)

Length — metre = centimetre
Mass — kilogram = gram
Time — second = second

consider a thin film of of soapy water (n = 1.33) on plexiglas. since light is a wave, there are many thicknesses of this film that will result in constructive interference.

Answers

When light passes through a thin film of soapy water (n = 1.33) on plexiglass, there are several thicknesses of this film that will result in constructive interference.

Due to the light being a wave, it can create a constructive or destructive interference pattern.The thickness of the thin film of soapy water can be calculated by using the equation 2nt = mλ where n is the refractive index of the medium, t is the thickness of the film, m is the order of interference, and λ is the wavelength of the incident light.

If the thickness of the film satisfies the above equation, the light waves will interfere constructively, resulting in a bright spot.

The order of interference determines the location of the bright spot and is indicated by an integer value (m = 0, 1, 2, 3...).

The reason why soapy water forms a thin film on plexiglass is due to the adhesion and cohesive forces between the two.

The thickness of the film can be controlled by changing the concentration of soap in water or the angle of incidence of the light.

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The concentration of sugar in Coke is approximately 10%, or 100 ppt. If you drink
a single can of coke, which holds 355 ml, how much sugar have you consumed?​

Answers

Answer:

35.5g of sugar

Explanation:

To solve this question we must assume the density of coke = Density of water = 1g/mL

Thus, in a single can of coke, the mass is 355g. Now, the 10% of this coke is sugar. That means the amount of sugar you are consuming is:

355g * (10/100) = 35.5g of sugar

10/100 = 10%

Which substance cannot be separated or broken down into simpler substances by chemical means?


table salt

gold wire


candle wax


water vapor

Answers

Answer: Gold Wire

Explanation:

Out of all of these options only gold wire is an element, elements are pure and cannot be broken down by any chemical means

hope it helped, good luck :)

HELPHELPHELPHELPHELPHELPHELP

Answers

Answer:

C

Explanation:

increasing T (knowledge of direct proportion and Inverse proportion)

C . Po ang tamang sagot

The percent yield for the reaction in which 15.6g of aluminum hydroxide is reacted in excess hydrogen chloride gas is 92.5%. What is the actual yield of aluminum chlorine?

Answers

Answer:

24.6 g

Explanation:

If a nuclear reactor were to have a meltdown, radioactive materials could escape in the form of gases from the reactor into the atmosphere and harm humans and the environment. One safety system that might be able to prevent such an escape is a:

Answers

A containment building.

hope this helpedddd

What happens as you decrease the temperature of a solution?
A.
The number of solute particles increases.
B.
The number of solute particles decreases.
C.
The rate of dissolution increases.
D.
The rate of dissolution decreases.
E.
The temperature has no effect on the rate of dissolution.

Answers

Answer:

D is the answer

Explanation:

D is your answer
I hope that helps

Complete and balance the following redox equation in acidic solution using the smallest whole number coefficients. What is the coefficient of SnO₂ in the balanced equation? Sn + HNO₃ → SnO₂ +NO₂ +H₂O a. 2
b. 1
c. 4
d. 3

Answers

The coefficient of SnO₂ in the balanced equation is c. 4.

To balance the redox equation in acidic solution, we need to ensure that the number of atoms of each element and the total charge are balanced on both sides of the equation.

By assigning appropriate oxidation numbers to each element and considering the changes in oxidation states, the balanced equation is as follows:

Sn + 4HNO₃ → SnO₂ + 4NO₂ + 2H₂O

In the balanced equation, the coefficient of SnO₂ is 4, indicating that 4 molecules of SnO₂ are produced. This balanced coefficient ensures that the number of tin (Sn) atoms and oxygen (O) atoms are equal on both sides of the equation. Therefore, the correct answer is c. 4.

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A 0.5 kg arrow was shot at a target. The arrow accelerated at 200 m/s2. What was
the net force on the arrow to the nearest newton?
Record your answer and be sure to use the correct place value.

Answers

Answer: I think 100?

Explanation:

It’s asking for the net FORCE! And the formula to find force is to multiply the mass by the acceleration which would be in this case 0.5x200 which would be 100

(PLS HELP ASAP <3)
a sample of oxygen gas occupies 600mL when the pressure is 900 mmHg, what is the pressure if the volume is increased to 800 mL​

Answers

Answer:

675 mmHg

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we're finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

We have

[tex]P_2 = \frac{900 \times 600}{800} = \frac{540000}{800} \\ = 675[/tex]

We have the final answer as

675 mmHg

Hope this helps you

How many atoms of aluminum are in 0.1 mol of aluminum?

Answers

Answer: The number of 'entities' in a mole of any pure substance is always that. 1 mole is equivalent to the number of atoms in a 12g lump of Carbon12.

Edit: I deliberately avoided using Avogadro's number as that is different, in a technical sense, to a mole. A mole is a base unit of the International System of Units (SI) which recognized amount of substance as an independent dimension of measurement. With this recognition, the Avogadro constant was no longer a pure number but a physical quantity associated with a unit of measurement, the reciprocal mole (mol−1) in SI units.  

Therefore Avogadro constant is DERIVED from the mole (nowadays) to give something like 6.02214179 x 10^23 mole^(-1). (based on 2006 evidence)

The table gives the concentrations of C2H4O(g)C2H4O(g) as a function of time at a certain temperature for the reaction shown.
C2H4O(g)⟶CH4(g)+CO(g)C2H4O(g)⟶CH4(g)+CO(g)
Verify that this is a first-order reaction by plotting ln[C2H4O]ln[C2H4O] versus time and determining the value of the rate constant.
[C2H4O] (M)Time (min)0.08600.000.046558.00.035583.00.0274107.00.0174150.0
_____________min^-1 ?

Answers

The required answer for the value of the rate constant, k, is 0.009 min-1.

Explanation: For verifying if the reaction is first order, the graph of ln [C2H4O] versus time will be plotted.The given data can be used for calculating the ln [C2H4O] as given below:ln [C2H4O] = ln [0.0860] = -2.45ln [C2H4O] = ln [0.0465] = -3.06ln [C2H4O] = ln [0.0355] = -3.33ln [C2H4O] = ln [0.0274] = -3.60ln [C2H4O] = ln [0.0174] = -4.05Now, we will plot a graph between ln [C2H4O] and time on a sheet of paper or in excel. From the graph, we will get a straight line The graph obtained is a straight line which confirms that the given reaction is first order.

To determine the value of rate constant, k, we will use the formula:ln [C2H4O] = -kt + ln [C2H4O]0Where,[C2H4O] = Concentration of ethylene oxide at time t [C2H4O]0 = Initial concentration of ethylene oxide at t = 0 k = Rate constant of the reaction t = Time period of the reactionNow, we will use the given data to determine the value of k:ln [0.0860] = -k × 0 + ln [0.0860] => k = 0ln [0.0465] = -k × 8 + ln [0.0860]=> k = 0.012ln [0.0355] = -k × 3 + ln [0.0860]=> k = 0.008ln [0.0274] = -k × 7 + ln [0.0860]=> k = 0.010ln [0.0174] = -k × 50 + ln [0.0860]=> k = 0.009Thus, the value of the rate constant, k, is 0.009 min-1.

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1. Why is the timing of tides predictable?
A. because winds are predictable
B. because the moon’s path is predictable
C. because ocean water density is predictable
D. because the sun’s movements are predictable

Answers

C hope that helps have a good one

Answer:

Because the moon's path is predictable

Explanation:

The moon affects the tides

Identify the orbital containing the electron removed in each ionization. Enter a subshell designation, such as 3p or 5s.
a. 1st
b. 2nd
c. 3rd

Answers

The orbitals are;

a. 1st - 4s

b. 2nd - 4s

c. 3rd - 3d

What is the orbital from which the first, second and third electrons are removed from the transition elements?

First, second, and third electrons from the 4s orbital are frequently removed from transition elements before any electrons from the 3d orbital. This is due to the fact that the energy levels of the 4s and 3d orbitals are quite similar and the energy level of the 4s orbital is marginally lower.

According to the Aufbau principle, electrons fill the lowest possible energy levels first in the electron configuration of transition elements before migrating to higher energy levels. As a result, electrons fill the 4s orbital first, followed by the 3d orbital, with the first two electrons.

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