- 1. Photochemistry is the branch of chemistry that deals with the study of chemical reactions that are initiated or influenced by light. These reactions occur when molecules absorb photons, leading to the formation of excited states with higher energy levels. These excited molecules can then undergo various processes, such as bond breaking or formation, isomerization, or energy transfer. Photochemistry plays a significant role in diverse fields, including environmental science, material science, and biological processes such as photosynthesis. Understanding photochemical reactions is crucial for developing new technologies and applications in areas such as photovoltaics, photodynamic therapy, and molecular imaging.
What is the primary process that occurs in photochemistry?
A) Light absorption
B) Thermal conduction
C) Mass diffusion
D) Chemical bonding
- 2. What is an excited state of a molecule in photochemistry?
A) A state with higher energy than the ground state
B) A stable state unaffected by light
C) A state of permanent fluorescence
D) A state with lower energy than the ground state
- 3. What is the role of a sensitizer in photochemical reactions?
A) To produce light
B) To absorb light and transfer its energy to the reactants
C) To inhibit light absorption
D) To accelerate thermal conduction
- 4. Which branch of chemistry focuses on the study of light-induced chemical reactions?
A) Analytical chemistry
B) Inorganic chemistry
C) Photochemistry
D) Physical chemistry
- 5. What is a photoreaction?
A) A reaction in total darkness
B) A chemical reaction initiated by light
C) A reaction involving only gases
D) A reaction requiring extreme heat
- 6. Why are most photochemical reactions performed in a solvent?
A) To increase reaction temperature
B) To prevent the use of light
C) To limit oxygen exposure
D) To help solubilize reactants and products
- 7. How can photochemistry be utilized in organic synthesis?
A) To dilute reactants
B) To cool down reactions
C) To speed up reactions using heat
D) To induce specific chemical transformations with light
- 8. What is the photoprotective role of melanin in the skin?
A) Absorbing UV radiation and reducing its harmful effects
B) Producing vitamin D
C) Enhancing UV radiation exposure
D) Reflecting UV radiation
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