Answer:
1.125
Explanation:
pH = -log[H+]
pH = -log(0.075)
pH = 1.125
B. n=1 to n=6
C. n=1 to n=5
D. n=5 to n=1
Answer:
Explanation:
Niels Bohr was a Danish physicist who proposed the hydrogen atom quantum model to explain the discontinuity of the atom's emission spectra.
In Bohr hydrogen atom model, the electrons occupy orbits identified with the numbers n = 1, 2, 3, 4, ... Each number (orbit) corresponds to a different energy level or state. The number n = 1 corresponds to the lowest energy level, and each higher number corresponds to a higher energy level.
This table shows the relative energy of the different orbits of the Bhor hydrogen atom:
Orbit Quantum Energy Relative
number level energy
First n = 1 1 E₁
Second n = 2 2 2E₁
Third n = 3 3 9E₁
Fourth n = 4 4 16E₁
Fifth n = 5 5 25E₁
Sixth n = 6 6 36E₁
Seventh n = 7 7 49E₁
When an electron jumps from a higher energy state down to a lower energy state, it emits a photon with an energy equal to the difference of the energies between the initial and the final states.
Since the n = 6 to n = 1 transition results in the higher relative energy difference (36E₁ - E₁ = 35E₁), you conclude that it is this transition which results in the emission of the highest-energy photon, which is the option A.
In the Bohrhydrogen atom model, the highest energy photon is emitted during the transition from the highest energy level to the lowest energy level. For the given options, the highest energy photon would be emitted in the transition from n=6 to n=1.
In the Bohr hydrogen atom model, the highest energyphoton is emitted during the transition from the highest energy level to the lowest energy level. In our choices, the largest transition (indicating the greatest energy change) is from n=6 to n=1. This is because the energy difference between the energy levels is the greatest, resulting in the emission of a photon with the highest energy.
In general, the greater the transition between the energy levels in a hydrogen atom (i.e. the more levels the electron 'jumps' downward), the higher the energy of the emitted photon.
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55.92 percent is the correct answer for online chemistry I just took the test!
B. The greater the dipole moment, the stronger the dipole-dipole forces.
C. The polarizability of elongated molecules is greater than that of compact, more spherical molecules.
D. London dispersion forces weaken in the order Xe < Kr < Ar
E. Hydrogen bonding leads to the strongest intermolecular forces.
Answer:
D. London dispersion forces weaken in the order Xe < Kr < Ar is an incorrect order, the correct order of London dispersion forces weaken in the order Ar < Kr < Xe.
Explanation:
A. Dispersion forces are present in all molecular substances.
is a correct statement London dispersion forces are weak intermolecular forces found in all molecular substances.
B. Clearly, greater the dipole moment, greater will be dipole-dipole forces. Hence true.
C) The polarizability of elongated molecules is greater than that of compact, more spherical molecules. The more elongated the molecule is more will be its ability to get polarized.
D. London dispersion forces weaken in the order Xe < Kr < Ar is an incorrect order, the correct order of London dispersion forces weaken in the order Ar< Kr < Xe.
E) Hydrogen bonding leads to the strongest intermolecular forces is also a correct statement. Hydrogen bonding leads to increase in boiling point.
Answer: Petroleum
Explanation:
Petroleum is a fossil fuel. It is also called as crude oil. It is a yellowish black liquid that can be found beneath the earth crust. It is a highly combustible fuel and generates lot of heat energy necessary for running the vehicle. It is the most commonly used fuel for shipping, and road transportation of goods and services. It helps the vehicles to run for long and covering the large distance.
The food availability would be affected by the shortage in absence of petroleum.
Answer:
The correct answer is option c) water and salts
Explanation:
Organic compounds contain carbon and hydrogen bonds. Both nucleic acids and proteins contain these. Water (H2O) and salts (Ex:NaCl) do not.
The pair of compounds that can be classified as inorganic from the given options are water and salts. These lack a carbon-hydrogen bond, unlike nucleic acids and proteins, which are organic.
The pair of compounds that can be classified as inorganic are water and salts. Inorganic compounds are defined as compounds that do not contain a carbon-hydrogen bond, which makes them different from organic compounds. Both water (H2O) and salts, like table salt (NaCl), do not contain any carbon-hydrogen bonds, so they are considered inorganic compounds. On the other hand, nucleic acids and proteins are both complex structures that include carbon-hydrogen bonds, making them organic compounds.
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The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%.
When your boss asks for your choice and the reasoning behind it, what would you tell him?
A. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
B. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
C. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.
D. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.
Answer: The correct answer is Option C.
Explanation: For a room to be soundproof, there should be minimum reflection of the sound waves and maximum absorption of the waves.
According to the question, the coefficient of absorption is maximum for Sample C. So, this sample will reflect minimum waves and will absorb maximum waves.
Hence, this sample is the best for making the room soundproof. Hence, the correct answer is Option C.