Help this is due tmr

In modern atomic theory, bohr's orbits are replaced by atomic orbitals. what is an atomic orbital?

Darya [45]

Bohr's theory states that the motion of the electron (particle) around the nucleus is very much similar to motion of the planets around the sun in the solar system. Both in the mathematical and physical sense.

The Bohr's Atomic theory only explains the motion of the electrons in discrete atomic orbitals that are predicted by the Bohr's equation.

It strictly implies that the electron only exists in these discreet orbitals and fails to explain anything about the nature of the electron in between the discrete orbitals.

The modern atomic theory does not share this limitation as it does not impose the electron to only occupy the discrete orbitals and neither does it impose particle nature upon the electron.

In the modern theory does not focus on describing the motion of the electron around the orbital but rather the probability of finding an electron around the nucleus. The modern atomic orbitals or electron clouds are the regions in which the probability of finding the electron is the highest when the wave function collapses. The Schrödinger's wave equation explains the evolution of the wave function in time. Hence enabling us to predict the future possible locations of the electron but never the exact location as that is impossible due to the Heisenberg's Uncertainty principle.

Learn more about Bohr's atomic orbitals by clicking here :

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4 0

2 years ago

The four bases which form rings of the DNA structure are

vesna_86 [32]

Answer:

- Adenine

- Guanine

- Thymine

- Cytosine

Explanation:

The nitrogen bases that form DNA are derivatives of pyrimidine and purine, both organic molecules with a heterocyclic ring.

In RNA, thymine is replaced by Uracil.

6 0

3 years ago

PLSSS HELP IF YOU KNOW THISS

mixas84 [53]

Answer:

C

Explanation:

Introspection is the examination of one's own conscious thoughts and feelings.

Introspection is closely related to human self-reflection and self-discovery and is contrasted with external observation.

8 0

3 years ago

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K-40 is a radioactive isotope of potassium that undergoes beta decay. What is the product of this decay

Aleks [24]

Answer:

⁴⁰₂₀Ca + ⁰₋₁e

Explanation:

Beta decay:

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

Properties of beta radiations:

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminium is used to block the beta radiation

⁴⁰₁₉K → ⁴⁰₂₀Ca + ⁰₋₁e

The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.

5 0

3 years ago

A scientist observed that a gas expanded from a volume of 0.200 L to a volume of 0.876 L. (a) What is the amount of work (in jou

Romashka [77]

Answer :

(a) The amount of work performed in this process is -26.6 J

(b) The value of change in internal energy is 0 J and change in heat is 26.6 J

Explanation :

As per first law of thermodynamic,

$\Delta U=q+w$

where,

$\Delta U$ = internal energy

q = heat

w = work done

As we know that, the term internal energy is the depend on the temperature and the process is isothermal that means at constant temperature.

So, at constant temperature the internal energy is equal to zero.

$\Delta U=0$

$q=-w$

The formula used for isothermally irreversible expansion is :

$w=-p_{ext}dV\\\\w=-p_{ext}(V_2-V_1)$

where,

w = work done

$p_{ext}$ = external pressure = 0.389 atm

$V_1$ = initial volume of gas = 0.200 L

$V_2$ = final volume of gas = 0.876 L

Now put all the given values in the above formula, we get :

$w=-p_{ext}(V_2-V_1)$

$w=-(0.389atm)\times (0.876-0.200)L$

$w=-0.263L.atm=-0.263\times 101.3J=-26.6J$

The work done by the system on the surroundings are, -26.6 Joules. In this, the negative sign indicates the work is done by the system on the surroundings.

Therefore, the amount of work performed in this process is -26.6 Joules.

q = - w = -(-26.6 J) = 26.6 J

Net heat transfer is, 26.6 J

6 0

4 years ago