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Goshia [24]
3 years ago
9

Cite two important quantum-mechanical concepts associated with the Bohr model of the atom.(b) Cite two important additional refi

nements that resulted from the wave-mechanical atomic model.
Chemistry
2 answers:
Alenkinab [10]3 years ago
8 0

Answer: Bohr postulated that electronic energy levels are quantized. Secondly, a photon of light of a particular frequency is emitted when electrons move from a higher to a lower energy levels.

Explanation:

The Bohr model of the atom is the immediate predecessor of the wave mechanical model of the atom. The wave mechanical model refined the Bohr's model by treating the electron as a wave having a wave function psi. The wave function describes the identity of the electron. From Heisenberg uncertainty principle, the position of a particle cannot be accurately and precisely measured. Hence the wave mechanical model added that electrons are not localized in orbits according to Bohr's model but the integral of psi squared dx gives the probability of finding the electron within a given space.

Alekssandra [29.7K]3 years ago
4 0

Answer A: The two important quantum-mechanical concepts associated with the Bohr model includes:

1) that electrons are particles moving in separate or individual orbitals.

2) electron energy is quantised into shells.

Explanation:

Neil- Bohr model structure of atoms shows that electrons of atoms appears in orbits of different energy revolving around the nucleus. He also described how these electrons can have one energy level at a time, that is, the electrons are quantised in shells.

Answer B: the two important refinements resulting from the wave mechanical atomic model includes:

1) that electron position is described in terms of a probability distribution.

2) electron energy is quantised into both shells and subshell.a and each electron is characterised by four quantum numbers.

Explanation: Wave mechanical atomic model was created by the Physicist Erwin Schrödinger. He refined the work of Bohr by using mathematical equations to describe the likelihood of finding an electron in a certain position. Rather than defining the exact path of an electron like in Bohr method, he predicted the odds of the location of the electrons.

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Answer: It is an exothermic process because heat energy is absorbed by the water as the NaOH(s) dissolves in it.

Explanation:

Endothermic reaction : It is a type of chemical reaction where the energy is absorbed from the surrounding. In the endothermic reaction, the reactant are less than the energy of product. In endothermic reaction, the change in enthalpy is, positive

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Thus as energy is absorbed by water, which has been released by NaOH, the process is exothermic.

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Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl4(g) + (1/2)O
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The question is incomplete, here is the complete question:

Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine.

CCl_4(g)+\frac{1}{2}O_2(g)\rightleftharpoons COCl_2(g)+Cl_2(g);K_c=4.4\times 10^9 at 1,000 K

Calculate Kc for the reaction 2CCl_4(g)+O_2(g)\rightleftharpoons 2COCl_2(g)+2Cl_2(g)

<u>Answer:</u> The value of K_c' for the final reaction is 1.936\times 10^{19}

<u>Explanation:</u>

The given chemical equations follows:

CCl_4(g)+\frac{1}{2}O_2(g)\rightleftharpoons COCl_2(g)+Cl_2(g);K_c

We need to calculate the equilibrium constant for the equation, which is:

2CCl_4(g)+O_2(g)\rightleftharpoons 2COCl_2(g)+2Cl_2(g)

As, the final reaction is the twice of the initial equation. So, the equilibrium constant for the final reaction will be the square of the initial equilibrium constant.

The value of equilibrium constant for net reaction is:

K_c'=(K_c)^2

We are given:

K_c=4.4\times 10^9

Putting values in above equation, we get:

K_c'=(4.4\times 10^9)^2=1.936\times 10^{19}

Hence, the value of K_c' for the final reaction is 1.936\times 10^{19}

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