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4 years ago

Electrons in atoms exist in particular energy level. A ___ must be emitted or absorbed to move between energy levels.

Chemistry

1 answer:

svetlana [45]4 years ago

8 0

Answer:

Photon of light

Explanation:

According to Bohr's model of the atom, electrons in atoms are found in specific energy levels. These energy levels are called stationary states, an electrons does not radiate energy when it occupies any of these stationary states.

However, an electron may absorb energy and move from one energy level or stationary state to another. The energy difference between the two energy levels must correspond to the energy of the photon of light absorbed in order to make the transition possible.

Since electrons are generally unstable in excited states, the electron quickly jumps back to ground states and emits the excess energy absorbed. The frequency or wavelength of the emitted photon can now be measured and used to characterize the transition. This is the principle behind many spectrometric and spectrophotometric methods.

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Where did the molecules of carbon dioxide come from while the tortilla chip was burning

CaHeK987 [17]

The answer can be explained when you burn something cleanly (with a very hot item) or not. With a candle lots of Carbon dioxide is producted but when using a bunson burner hardly any CO2 is produced.

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3 years ago

Sulfur oxide is a main source of acid deposition. a. True b. False

ICE Princess25 [194]

True

The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NOx).

3 0

3 years ago

Which would be considered a substance? Element, Compound, Mixture.

Romashka [77]

Answer:

MIXTURE , ELEMENT AND SUBSTANCE

3 0

3 years ago

How many 3-liter balloons could the 12-L helium tank pressurized to 160 atm fill? Keep in mind that an "exhausted" helium tank i

vaieri [72.5K]

Answer:

The 12L helium tank pressurized to 160 atm will fill 636 3-liter balloons

Explanation:

It is possible to answer this question using Boyle's law:

$P_1V_1=P_2V_2$

Where P₁ is the pressure of the tank (160atm), V₁ is the volume of the tank (12L), P₂ is the pressure of the balloons (1atm, atmospheric pressure) And V₂ is the volume this gas will occupy at 1 atm, thus:

160atm×12L = 1atm×V₂

V₂ = 1920L

As the tank will never be empty, the volume of the gas able to fill balloons is the total volume minus 12L, thus the volume of helium able to fill balloons is:

1920L - 12L = 1908L

1908L will fill:

1908L× $\frac{1balloon}{3L}$ = 636 balloons

I hope it helps!

7 0

4 years ago

What gets reduced in an electrolytic cell made with nickel and copper electrodes?

jekas [21]

Answer:

D. Ni²⁺

Explanation:

We know at once that the answer cannot be A or C, because Ni and Cu are already in their lowest oxidation states.

The correct answer must be either B or D.

An electrolytic cell is the opposite of a galvanic cell. In the former, the reaction proceeds spontaneously. In the latter, you must force the reaction to occur.

One strategy to solve this problem is:

Look up the standard reduction potentials for the half reaction·
Figure out the spontaneous direction.
Write the equation in the reverse direction.

1. Standard reduction potentials

E°/V

Cu²⁺ + 2e⁻ ⟶ Cu; 0.3419

Ni²⁺ + 2e⁻ ⟶ Ni; -0.257

2. Galvanic Cell

We reverse the direction of the more negative half cell and add.

E°/V

Ni ⟶ Ni²⁺ + 2e⁻; 0.257

Cu²⁺ + 2e⁻ ⟶ Cu; 0.3419

Ni + Cu²⁺ ⟶ Cu + Ni²⁺; 0.599

This is the spontaneous direction.

Cu²⁺ is reduced to Cu.

3. Electrochemical cell

E°/V

Ni²⁺ + 2e⁻ ⟶ Ni; -0.257

Cu ⟶ Cu²⁺ + 2e⁻; -0.3419

Cu + Ni²⁺ ⟶ Ni + Cu²⁺; -0.599

This is the non-spontaneous direction.

Ni²⁺ is reduced to Ni in the electrolytic cell.

8 0

3 years ago