2. The characteristic bright-line spectrum (color) of an element is produced whenA elections are ermitted by the nucleus as beta particles
B electrons move to higher energy levels
** C electrons are gained by an atom in
D. člectrons fall bàok to lower energy levels
Answers
Answer:
option d= electrons fall back to the lower energy levels
Explanation:
Excitation:
When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits.
De-excitation:
When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.
Fluorescence:
In fluorescence the energy is absorbed by the electron having shorter wavelength and high energy usually of U.V region. The process of absorbing the light occur in a very short period of time i.e. 10 ∧-15 sec. During the fluorescence the spin of electron not changed.
The electron is then de-excited by emitting the light in visible and IR region. This process of de-excitation occur in a time period of 10∧-9 sec.
Phosphorescence:
In phosphorescence the electron also goes to the excitation to the higher level by absorbing the U.V radiations. In case of Phosphorescence the transition back to the lower energy level occur very slowly and the spin pf electron also change.
Final answer:
The characteristic color (spectrum) of an element is produced when its electrons fall back to lower energy levels. They absorb energy to jump to a higher level, then emit it in the form of light of a specific wavelength when returning to their original or lower level.
Explanation:
The characteristic bright-line spectrum (color) of an element is produced when electrons fall back to lower energy levels (Option D). This process is part of the quantum mechanical model of the atom, particularly in the field of spectroscopy. Each element possesses unique energy levels. When an electron in an atom absorbs energy, it jumps to a higher energy level. When the electron returns to its original or lower energy level, it emits energy in the form of light of a specific wavelength. This is viewed as a unique color in the spectrum.
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Electric current passes through a filament of an incandescent bulb, thereby increasing it temperature. When current flows, it contains electrons through the filament to produce light. Typically, incandescent light bulb consists of a glass enclosure that contains tungsten filament. The glass enclosure contains either a vacuum or an inert gas that serves as the filament protection from evaporating. Incandescent light bulbs contain a stem attached at to its base to allow the electrical contacts to run through the envelope without gas or air leaks.
Answers
Answer: 2.30x10²⁴ molecules CO2
Explanation: Solution:
Convert mass of CO2 to moles
Convert moles of CO2 to molecules using Avogadro's number.
168.2 g CO2 x 1 mole CO2 / 44 g CO2 x 6.022 x10²³ molecules CO2 / 1 mole CO2
= 2.30 x10²⁴ molecules CO2
Final answer:
The sample of carbon dioxide weighing 168.2 grams contains approximately 2.30 x 10^24 molecules. This is calculated by first converting the sample mass to moles, and then multiplying by Avogadro's Number.
Explanation:
To calculate the number of molecules in a sample, you need to know the formula for the substance and the molar mass of the substance. For carbon dioxide (CO2), the molar mass is 44.01 grams/mole.
The sample mass is 168.2 grams, so to calculate the number of moles, we divide the mass of the sample by the molar mass:
Number of moles = Sample Mass / Molar Mass =168.2 grams / 44.01 grams/mole = 3.82 moles (rounded to two decimal places).
The number of molecules is then calculated by multiplying the number of moles by Avogadro's Number (6.022 x 10^23 molecules/mole):
Number of molecules = Number of Moles x Avogadro's Number = 3.82 moles x 6.022 x 10^23 molecules/mole = 2.30 x 10^24 molecules (rounded to two decimal places).
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In the given question, melting cheese is a type of physical change.
A physical change is defined as a change in the physical properties of a substance, such as its shape, size, or state, without changing its chemical composition.
When cheese is melted, it changes from a solid to a liquid state, but its chemical composition remains the same. The molecules in the cheese are simply rearranged as it is heated, causing it to melt.
Therefore, melting cheese is a physical change. This is because the cheese changes from a solid to a liquid state, but its chemical composition remains the same.
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O3
OCN-
Co2
Cs2
Answers
Answers
Here are the choices:
A. Distillation
B. evaporation
C. Filtration
D. Sorting
Explanation:
A precipitate is an insoluble solid that does not dissolve in a chemical reaction or or mixture.
For example,
Therefore, the precipitate formed can be separated out by filtration method.
As this method will most suitably extract the precipitate and separate it from the remaining solution.
Answers
Large organic molecules such as starch need to be broken down into simpler forms - maltose and glucose respectively via digestion. Other organic larger molecules are broken down into simpler forms like protein to amino acids and lipids to fatty acids and glycerol etc.
Glucose is one of several simple sugars (monosaccharides).
Biological catalysts are what help to break down these large molecules (polymers) to simpler ones (monomers), they are called enzymes.