- 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) Mass diffusion
B) Thermal conduction
C) Chemical bonding
D) Light absorption
- 2. What is an excited state of a molecule in photochemistry?
A) A state of permanent fluorescence
B) A stable state unaffected by light
C) A state with higher energy than the ground state
D) A state with lower energy than the ground state
- 3. What is the role of a sensitizer in photochemical reactions?
A) To accelerate thermal conduction
B) To absorb light and transfer its energy to the reactants
C) To inhibit light absorption
D) To produce light
- 4. What is a photoreaction?
A) A reaction involving only gases
B) A chemical reaction initiated by light
C) A reaction requiring extreme heat
D) A reaction in total darkness
- 5. How can photochemistry be utilized in organic synthesis?
A) To induce specific chemical transformations with light
B) To dilute reactants
C) To speed up reactions using heat
D) To cool down reactions
- 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. What is the photoprotective role of melanin in the skin?
A) Reflecting UV radiation
B) Absorbing UV radiation and reducing its harmful effects
C) Enhancing UV radiation exposure
D) Producing vitamin D
- 8. Which branch of chemistry focuses on the study of light-induced chemical reactions?
A) Photochemistry
B) Analytical chemistry
C) Physical chemistry
D) Inorganic chemistry
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