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4 years ago

How did the uncertainty principle influence thinking about the arrangement of electrons in atoms?

Chemistry

2 answers:

Korolek [52]4 years ago

4 0

Answer:Scientists realized that electrons could not be located in defined orbits.

Explanation:

According the Heisenberg's uncertainty principle, the momentum and position of a particle cannot be simultaneously measured with precision. This implies that the position of a particle (including the electron) cannot be accurately determined with precision. This became a failure of the Bohr's model which postulated that electrons are located in definite orbits. By combining the wave particle duality of Louis De Broglie and the the idea of Max Plank, Erwin Schrödinger arrived at the wave mechanical model of the atom in 1927.

Vlad [161]4 years ago

3 0

Answer:

Heisenberg's Uncertainty Principle states that there is inherent uncertainty in the act of measuring a variable of a particle. Commonly applied to the position and momentum of a particle, the principle states that the more precisely the position is known the more uncertain the momentum is and vice versa.

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Water heater contains 56 part a how many kilowatt-hours of energy are necessary to heat the water in the water heater by 25 ?c?

DochEvi [55]

Answer is: 550,021 kWh of energy is needed to heat the water

V(water) = 51 gal = 51·3,78 = 189,3 L.

ΔT(water) = 25°C.

d(water) = 1000 g/L.

m(water) = V(water) · d(water)

m(water) = 189,3 L · 1000 g/L

m(water) = 189300 g.

Q = m(water) · ΔT(water) · C(water)

Q = 189300 g · 25°C · 4,184 J/°C·g

Q = 19800780 J = 19800,78 kJ ÷ 3600 = 550,021 kWh.

6 0

3 years ago

Consider the reaction: CO2(g) + CCl4(g) ⇌ 2 COCl2(g) ΔG° = 46.9 kJ Under the following conditions at 25 oC: LaTeX: P_{CO_2}P C O

Mamont248 [21]

Answer : The value of $\Delta G_{rxn}$ is, $-47.0kJ/mole$

Explanation :

The formula used for $\Delta G_{rxn}$ is:

$\Delta G_{rxn}=\Delta G^o+RT\ln K_p$ ............(1)

where,

$\Delta G_{rxn}$ = Gibbs free energy for the reaction

$\Delta G_^o$ = standard Gibbs free energy = 46.9 kJ

R = gas constant = 8.314 J/mole.K

T = temperature = $25^oC=273+25=298K$

$K_p$ = equilibrium constant

First we have to calculate the value of $K_p$ .

The given balanced chemical reaction is,

$CO_2(g)+CCl_4(g)\rightarrow 2COCl_2(g)$

The expression for reaction quotient will be :

$K_p=\frac{(p_{COCl_2})^2}{(p_{CO_2})\times (p_{CCl_4})}$

In this expression, only gaseous or aqueous states are includes and pure liquid or solid states are omitted.

Now put all the given values in this expression, we get

$K_p=\frac{(0.653)^2}{(0.459)\times (0.984)}$

$K_p=0.944$

Now we have to calculate the value of $\Delta G_{rxn}$ by using relation (1).

$\Delta G_{rxn}=\Delta G^o+RT\ln K_p$

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

$\Delta G_{rxn}=-46.9kJ/mol+(8.314\times 10^{-3}kJ/mole.K)\times (298K)\ln (0.944)$

$\Delta G_{rxn}=-47.0kJ/mol$

Therefore, the value of $\Delta G_{rxn}$ is, $-47.0kJ/mole$

3 0

3 years ago

How many flourine atoms are present in 5.3 grams of flourine sample? (note that you have to use the 3 step method)

Bingel [31]

Answer:

1.7x10²³ Fluorine atoms are present

Explanation:

To solve this question we must know that, to find the amount of atoms of a substance from its mass, we have, as first, to convert this mass to moles using molar mass of the substance. With the moles we can find the amount of molecules using Avogadro's number. And with the formula we can know the atoms presents:

<em>Moles Fluorine (F₂, Molar mass: 37.997g/mol)</em>

5.3g * (1mol / 37.997g) = 0.139 moles F₂

<em>Molecules F₂:</em>

0.139 moles F₂ * (6.022x10²³molecules / mol) = 8.4x10²² molecules F₂

As 1 molecule of F₂ contains 2 atoms of Fluorine:

8.4x10²² molecules F₂ * 2 =

<h3>1.7x10²³ Fluorine atoms are present</h3>

8 0

3 years ago

How many moles of fe2o3 will be produced from 18.0 g of fe assuming o2 is available in excess

soldier1979 [14.2K]

Answer:

0.161 moles

Explanation:

Given parameters:

Mass of Fe = 18g

Unknown:

Number of moles of Fe₂O₃ = ?

Solution:

To solve this problem, we have to work from the known to the unknown specie.

One cogent point we need to take from this problem is that oxygen gas is in excess. The Fe reacting is therefore the limiting reactant which implies that it will determine the extent of the reaction.

Now, the known specie is Fe;

The balanced reaction equation is shown below;

4Fe + 3O₂ → 2Fe₂O₃

Proceed to find the number of moles of Fe given;

Number of moles of Fe = $\frac{mass}{molar mass}$

Molar mass of Fe = 56g/mol

Number of moles of Fe = $\frac{18}{56}$ = 0.32mole

From the balanced reaction equation;

4 moles of Fe produced 2 moles of Fe₂O₃

0.32 moles of Fe will produce $\frac{0.32 x 2}{4}$ = 0.161 moles of Fe₂O₃

8 0

4 years ago

Flood waters

Nana76 [90]

Answer:

I think the answer is EROSION because it has to do with the movement of sediment.

Explanation:

Hope this helps!

7 0

3 years ago