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3 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]3 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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Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water?

nlexa [21]

Generally we have to kinds of conductors

a) metallic conductors: which conduct electricity due to free movement of electrons

b) electrolytic conductors: which conduct electricity due to movement of ions.

HCN is an electrolyte and is non conducting in pure state as it has no free ions or electrons

When HCN is dissolved in water it dissociates as

$HCN--->H^{+}(aq)+CN^{-}(aq)$

These ions obtained due to dissociation of HCN makes it conducting in nature.

8 0

2 years ago

Which of th following is true for a parallel circuit

emmainna [20.7K]

Answer:

B. The voltage is the same across all resistors in the circuit.

Explanation:

The answer choices are:

A.The current is the same across all resistors in the circuit.

B.The voltage is the same across all resistors in the circuit.

C. As more resistors are added, the current will decrease.

D. The sum of the voltage drops will equal the total voltage.

<h2>Solution</h2>

In a simple parallel circuit, each component (resistor) is connected directly to the battery forming different branches or pathways to the current.

Thus, the ends of each resistor receives the total potential difference or voltage from the battery, which is what the statement B. asserts. Hence, statement B is true.

On the other hand, the current will split among the different pathways, following Ohm's law: the greater the resistance of the resistor the lower the current. Thus, the statement A is false.

For a parallel circuit, the total resistance decreases as more resistors are added, which means that, again following Ohm's law, the current will increase, contradicting the statement C. Thus, the statement C is false.

It is in the series circuit that 'the sum of the voltage drops will equal the total voltage"; in a parallel circuit the voltage drop is the just one and the same for each resistor. Thus, the statement D is false,too.

8 0

2 years ago

Draw the electron configuration for a neutral atom of nitrogen.

velikii [3]

Answer:

1s22s22p3.

Explanation:

Electronic configuration of a neutral atom is 1s22s22p3.

Please see the image attached

Neutral atom of nitrogen will have equal number of proton and electron i.e equal to 7. 7 electron of the nitrogen are placed into the s and p orbitals in the ground state.

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2 years ago

Why is Iron found as an Ore in the Earth

Stella [2.4K]

$\huge \orange {\mathbb {Answer}}$

Ore is a deposit in Earth's crust of one or more valuable minerals. The most valuable ore deposits contain metals crucial to industry and trade, like copper, gold, and iron. Copper ore is mined for a variety of industrial uses. Copper, an excellent conductor of electricity, is used as electrical wire.

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3 years ago

What conditions are needed to prevent iron from rusting?

yulyashka [42]

9 Ways to Prevent Rust
Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. ...
Apply Oil. ...
Apply a Dry Coating. ...
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Store Properly. ...
Galvanize. ...
Blueing. ...
Powder Coating.

3 0

2 years ago