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Is activation energy for thermal and photochemical reactions same?
The definition of the activation energy is exactly the same -- the thermodynamic energy barrier that the reactant must pass over to convert to products. The difference between a thermal and a photochemical reaction is only where the reactants get the energy to get over this barrier. In a thermal reaction, that energy is given by the temperature, and is carried in excited rotational modes, higher kinetic energies and if hot enough, excited vibrational states. In a photochemical reaction, the activation energy is provided by photons, usually in the form of electronic excited states, but could also be vibrational or rotational. The concept of the activation barrier is identical in both cases.
What happens when chlorine water is exposed to sunlight?
When chlorine water is exposed to sunlight, it can undergo a reaction that produces hydrochloric acid and oxygen gas. This reaction is a form of photochemical decomposition, where the energy from sunlight breaks down the chlorine water into its constituent elements.
Is energy conversion accomplished in the light reaction phase?
Yes, energy conversion is accomplished in the light reaction phase of photosynthesis. During this phase, light energy is converted into chemical energy in the form of ATP and NADPH by the process of photophosphorylation. These energy-carrying molecules are then used in the Calvin cycle to produce sugars.
What happens when hydrogen reacts with chlorine in direct sunlight?
When hydrogen reacts with chlorine in direct sunlight, they combine to form hydrogen chloride gas. This reaction is highly exothermic and produces a lot of heat and light. The reaction is also photochemical, meaning it is initiated by the energy of sunlight.
In what form is the energy released in this reaction?
In an exothermic reaction heat energy is released.
Energy is lost from a reaction in a form of what?
Energy is lost from a reaction in the form of heat. This heat is often referred to as exothermic heat, as it is released from the system during the reaction.
What kind of energy is given from a nuclear fission reaction?
The initial release of energy is in the form of kinetic energy of the fission fragments, but they are quickly stopped inside the fuel and the energy appears as heat, which is then passed into the coolant, whether water or gas.
What happens to sodium iodide when exposed to light?
When sodium iodide is exposed to light, it may undergo a photochemical reaction where it can decompose or form other products. This is because the light energy can excite the molecules in sodium iodide, leading to potential photoreactions.
What is light reaction and dark reaction?
Photosynthesis can be divided into two part: light reaction is the first stage of photosynthesis, occurring only in the presence of light, during which energy captured from light drives the production of ATP. dark reaction is the second stage of photosynthesis, not requiring light to occur, and during which energy released from ATP drives the production of organic molecules from carbon dioxide.
What is a reaction that releases energy in the form of heat?
Exothermic reaction
What type of reaction is it when methane reacts with bromine?
The reaction between methane and bromine is a substitution reaction, specifically a halogenation reaction. In this reaction, one or more hydrogen atoms in methane are replaced by bromine atoms to form bromomethane.
Reaction that absorbs energy in the form of heat?
Endothermic reaction. In an endothermic reaction, energy is absorbed by the system from the surroundings in the form of heat, causing the surroundings to cool down.
