Photochemical Reactions
Chemistry ⇒ Chemical Reactions and Equations
Photochemical Reactions starts at 10 and continues till grade 12.
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Describe the difference between a photochemical and a thermal reaction.
Describe the mechanism of the photochemical reaction between hydrogen and chlorine.
Describe the process of photosensitization in photochemical reactions.
Explain the importance of photochemical reactions in the environment.
Explain the role of chlorophyll in photochemical reactions in plants.
Explain why photochemical reactions are generally carried out in colored or dark bottles.
Explain why the rate of a photochemical reaction increases with increasing light intensity.
State one industrial application of photochemical reactions.
Which law states that only the light absorbed by a system can bring about a photochemical change? (1) Law of Conservation of Mass (2) Grotthuss–Draper Law (3) Hess's Law (4) Boyle's Law
Which of the following is a characteristic of photochemical reactions? (1) They occur only at high temperatures. (2) They are initiated by light. (3) They do not involve energy changes. (4) They require a catalyst.
Which of the following is a correct example of a photochemical reaction? (1) 2H2 + O2 → 2H2O (2) 2AgBr(s) → 2Ag(s) + Br2(g) (in sunlight) (3) CaCO3 → CaO + CO2 (on heating) (4) Fe + S → FeS
Which of the following is a necessary condition for a photochemical reaction to occur? (1) Presence of a catalyst (2) Absorption of light by reactants (3) High pressure (4) High temperature
Fill in the blank: In photography, the photochemical reaction involves the decomposition of __________.
Fill in the blank: The minimum amount of energy required to initiate a photochemical reaction is called __________.
Fill in the blank: The photochemical reaction 2HI(g) → H2(g) + I2(g) is initiated by __________.
Fill in the blank: The photochemical reaction 2NO2 + sunlight → 2NO + O2 is an example of __________.
True or False: All photochemical reactions require the presence of a catalyst.
True or False: All wavelengths of light are equally effective in initiating photochemical reactions.
True or False: Photochemical reactions can occur in the absence of light.
True or False: The decomposition of ozone in the atmosphere is a photochemical reaction.
