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endothermic reaction
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Endothermic Reaction
Chemical reaction that requires an input of energy in the form of heat for it to proceed; the energy is absorbed from the surroundings by the reactants. A sign that this is happening is if the container holding the reactants feels cold and the temperature of the reactants falls. The energy absorbed is represented by the symbol +ΔH.
The dissolving of sodium chloride in water and the process of photosynthesis are both endothermic changes. In photosynthesis the energy absorbed is in the form of light energy. In an endothermic reaction the energy needed to break the chemical bonds in the reactants is greater than the energy released when bonds are formed in the products. See energy of reaction.
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reduction
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rust (chemistry)
smoke
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activation energy
ammonia
biotechnology
brewing
catalyst
chemical equation
chemical equilibrium
collision theory
combustion
competition reaction
conservation of mass
contact process
decomposition
denaturation
displacement reaction
endothermic reaction
energy of reaction
energy transfer
enzyme
equation (chemistry)
equation, word
exothermic reaction
fossil fuel
Haber process
kinetic theory
neutralization
nitric acid
oxidation (chemistry)
particle theory
photosynthesis
rate of reaction
reaction
redox reaction
reduction
respiration
reversible reaction
rust (chemistry)
smoke
sulphuric acid
yield (chemistry)
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