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Questions and Answers
What is the quantum yield for the decomposition if 0.01 moles of HI molecules decompose to produce 3.0115×10^22 photons?
What is the quantum yield for the decomposition if 0.01 moles of HI molecules decompose to produce 3.0115×10^22 photons?
Which electronic transition is associated with a peak at λmax=280 nm in the UV spectrum of acetone?
Which electronic transition is associated with a peak at λmax=280 nm in the UV spectrum of acetone?
Which electronic transition is associated with a peak at λmax=190 nm in the UV spectrum of acetone?
Which electronic transition is associated with a peak at λmax=190 nm in the UV spectrum of acetone?
Which range of IR absorption is typical for the stretching vibration of the carbonyl group in simple aldehydes and ketones?
Which range of IR absorption is typical for the stretching vibration of the carbonyl group in simple aldehydes and ketones?
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What is the fundamental frequency of vibration of a CO molecule with a force constant of 2.66 x 10^3 N/m?
What is the fundamental frequency of vibration of a CO molecule with a force constant of 2.66 x 10^3 N/m?
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What is the absorbance of the dye solution with a transmittance of 30% at 600 nm?
What is the absorbance of the dye solution with a transmittance of 30% at 600 nm?
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What is the absorbance of a 0.02 M dye solution in a 3 cm cell for light of wavelength 6000Ao with a percentage transmittance of 40%?
What is the absorbance of a 0.02 M dye solution in a 3 cm cell for light of wavelength 6000Ao with a percentage transmittance of 40%?
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If the quantum yield for a reaction is 0.8, what does this indicate about the reaction?
If the quantum yield for a reaction is 0.8, what does this indicate about the reaction?
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Stereochemistry deals with the study of molecules as two dimensional objects.
Stereochemistry deals with the study of molecules as two dimensional objects.
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If a substance absorbed 3.5 x 10^18 photons of light per second and 0.003 mole of it reacted in 25 minutes, what is the quantum yield of the reaction?
If a substance absorbed 3.5 x 10^18 photons of light per second and 0.003 mole of it reacted in 25 minutes, what is the quantum yield of the reaction?
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Which law governs the relationship between the absorbance, molar absorption coefficient, concentration, and thickness of a solution?
Which law governs the relationship between the absorbance, molar absorption coefficient, concentration, and thickness of a solution?
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Structural isomerism refers to isomers with the same molecular formula but different arrangement of atoms.
Structural isomerism refers to isomers with the same molecular formula but different arrangement of atoms.
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Chain isomerism arises due to the difference in arrangement of carbon atoms within a molecule.
Chain isomerism arises due to the difference in arrangement of carbon atoms within a molecule.
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Optical isomerism is a type of structural isomerism where the atoms are arranged in completely different order.
Optical isomerism is a type of structural isomerism where the atoms are arranged in completely different order.
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Tautomerism refers to compounds having the same molecular formula but different structural and physical/chemical properties.
Tautomerism refers to compounds having the same molecular formula but different structural and physical/chemical properties.
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Is metamerism a common type of isomerism?
Is metamerism a common type of isomerism?
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Tautomerism involves equilibrium between two compounds with the same molecular formula?
Tautomerism involves equilibrium between two compounds with the same molecular formula?
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Functional group isomerism involves isomers with the same functional groups?
Functional group isomerism involves isomers with the same functional groups?
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In position isomerism, the basic carbon skeleton remains unchanged but important groups are moved around?
In position isomerism, the basic carbon skeleton remains unchanged but important groups are moved around?
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Ring chain isomerism involves compounds with different molecular formulas?
Ring chain isomerism involves compounds with different molecular formulas?
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Study Notes
Quantum Yield and Photons
- Quantum yield is the number of molecules reacted per photon absorbed, calculated as the number of molecules reacted divided by the number of photons absorbed.
- If 0.01 moles of HI molecules decompose to produce 3.0115×10^22 photons, the quantum yield for the decomposition can be calculated.
Electronic Transitions and UV Spectra
- The peak at λmax=280 nm in the UV spectrum of acetone corresponds to a specific electronic transition.
- The peak at λmax=190 nm in the UV spectrum of acetone corresponds to a different electronic transition.
IR Spectra and Carbonyl Group
- The stretching vibration of the carbonyl group in simple aldehydes and ketones typically exhibits IR absorption in a specific range.
Molecular Vibration and Force Constant
- The fundamental frequency of vibration of a CO molecule can be calculated using its force constant, which is 2.66 x 10^3 N/m.
Absorbance and Transmittance
- The absorbance of a dye solution can be calculated from its transmittance, which is 30% at 600 nm.
- The absorbance of a 0.02 M dye solution in a 3 cm cell can be calculated for light of wavelength 6000Ao with a percentage transmittance of 40%.
Quantum Yield and Reaction Efficiency
- A quantum yield of 0.8 indicates that 80% of the absorbed photons result in a reaction.
Stereochemistry
- Stereochemistry is the study of molecules as three-dimensional objects, not two-dimensional objects.
Quantum Yield and Reaction Rate
- If a substance absorbs 3.5 x 10^18 photons of light per second and 0.003 mole of it reacts in 25 minutes, the quantum yield of the reaction can be calculated.
Beer-Lambert Law
- The Beer-Lambert Law governs the relationship between the absorbance, molar absorption coefficient, concentration, and thickness of a solution.
Types of Isomerism
- Structural isomerism refers to isomers with the same molecular formula but different arrangement of atoms.
- Chain isomerism arises due to the difference in arrangement of carbon atoms within a molecule.
- Optical isomerism is a type of structural isomerism where the atoms are arranged in a non-superimposable manner.
- Tautomerism refers to compounds having the same molecular formula but different structural and physical/chemical properties.
- Functional group isomerism involves isomers with the same functional groups.
- Position isomerism involves the movement of important groups around the basic carbon skeleton.
- Ring-chain isomerism involves compounds with different molecular formulas.
- Metamerism is a type of isomerism where the atoms are arranged in a different order.
Studying That Suits You
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Description
Test your knowledge of absorbance and transmittance calculations with these two practice questions. Practice using the formula A = log(Io/I) to find absorbance and understand the relationship between transmittance and absorbance.
