Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in and the atom emits a photon of light with a wavelength of 486 nm. Group of answer choices

Answers

Answer 1

Answer:

Complete Question

Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in n=4 and the atom emits a photon of light with a wavelength of 486 nm. Group of answer choices

Answer:

$n=2$

Explanation:

From the question we are told that:

Wavelength $\lambda=486nm=>486*10^(-9)$

Generally the equation for Atom Transition is mathematically given by

$(1)/(\lambda)=R_(\infty )((1)/(n_1^2)-(1)/(n_2^2))$

Where

Rydberg constant $R_(\infty)=1.097*10^7$

Therefore

$(1)/(486*10^(-9))=1.097*10^7*((1)/(n_1^2)-(1)/(4^2))$

$((1)/(n_1^2)-(1)/(4^2))=(1)/(486*10^(-9)*1.097*10^7)$

$n_1^2=3.98$

$n=1.99$

$n=2$

Answer 2

Answer:

Final answer:

The final value of n in the hydrogen atom transition is 4.

Explanation:

The end value of n in a hydrogen atom transition can be determined using the equation En = Eo * Z^2 / n^2, where En is the energy of the excited state and Eo is the ionization energy. Since the electron starts in the ground state (n = 1) and emits a photon of light with a wavelength of 486 nm, we can use Equation 6.49 to solve for n. By substituting m = 1 and λ = 486 nm into Equation 6.49, we find that n is approximately 4. Therefore, the final value of n in the hydrogen atom transition is 4.

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Be sure to answer all parts.Calculate the percent composition by mass (to 4 significant figures) of all the elements in calcium
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% Ca
%P
% 0

Answers

Answer:

38.7%

41.3%

20%

Explanation:

The percentage composition helps to know the what percent of the total mass of a compound is made up of each of the constituent elements or groups.

To solve this problem:

find the formula mass by adding the atomic masses of the atoms that makes up the compound.
place the mass contribution of the element or group to the formula mas and multiply by 100;

Compound:

Ca₃(PO₄)₂

Formula mass = 3(40) + 2[31 + 4(16)]

= 120 + 2(95)

= 120 + 190

= 310

%C = $(3(40))/(310)$ x 100 = 38.7%

%P = $(8(16))/(310)$ x 100 = 41.3%

%O = $(2(31))/(310)$ x 200 = 20%

In the first step, 4-sulfanilic acid reacts with sodium nitrate to form diazonium ion intermediate. Identify the Lewis acid and Lewis base in this reaction.

Answers

Answer:

In the formation of diazonium ion intermediate, the 4-sulfanilic acid acts as the Lewis acid, while the sodium nitrite is the Lewis base.

Explanation:

A Lewis acid is by definition an electron pair acceptor (such as the H+ ion, that can accept a pair of non-bonding electrons) and a Lewis base is an electron pair donor (such as the OH- ion, that can donate a pair of non-bonding electrons).

In the formation of diazonium ion intermediate, the 4-sulfanilic acid acts as the Lewis acid(by transference of a lone pair from its nitrogen atom), while the sodium nitrite is the Lewis base.

N.B its sodium nitrite, NaNO2 (which is slightly basic in solution) not nitrate NaNO3 (which is neutral in solution)

4-sulfanilic acid acts as Lewis acid, while Sodium nitrite is the Lewis base.

What are Lewis acid and Lewis base?

A Lewis acid is an electron pair acceptor (such as the H+ ion, that can accept a pair of non-bonding electrons) and a Lewis base is an electron pair donor (such as the OH- ion, that can donate a pair of non-bonding electrons).

In the formation of diazonium ion intermediate, the 4-sulfanilic acid acts as the Lewis acid(by transference of a lone pair from its nitrogen atom), while the sodium nitrite is the Lewis base.

Sodium nitrite, NaNO₂ (which is slightly basic in solution) not nitrate NaNO₃ (which is neutral in solution)

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Write the number 4.92 x 10-3 from scientific notation to regular.
Please help?????

Answers

Explanation:

4.92*10-3=4.92/10^3=

4.92/1000=0.00492

Convection currents in the atmosphere influence many weather patterns. What property of the air has the most influence on convection currents?1. The direction of the wind

2. The velocity of the wind

3. The temperature of the air

4. The mass of the air

Answers

Convection currents are largely influenced by air temperature. A low-pressure area is produced when air is heated because it becomes less dense and rises.

What effect on the climate does convection have?

For instance, the air above the Earth heats and rises as its surface warms from the sun. This air may continue to rise while cooling and producing cumulus clouds if the conditions allow.

How do air masses respond to convection currents?

Climate-affecting wind patterns are driven by convection currents. Convection currents are used to shift air masses. There are two different kinds of air masses: warm and cold. From higher latitudes to lower latitudes, cold air masses travel.

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You would like to make a 100 mL buffer solution at pH 8.00. Assuming you would like to accomplish this with a hypochlorous acid (HOCl) buffer (HOCl/NaOCl), Ka= 3.0 * 10-8. If the solution is 0.3 M in HOCl, what concentration of NaOCl would be necessary in the buffer solution to obtain a pH of 8.0?

Answers

Answer:

To obtain the pH of 8.0, the concentration of NaOCl needs to be 0.9 M in the 0.3 M HOCl solution

Explanation:

This problem can be solved by Henderson-Hasselbalch equation, which gives relation between the concentration of acid, its salt, pKa and the pH of the solution. This equation is given as,

$pH=-log(K_a)+log([NaOCl])/([HOCl])$