Chapter 17- Energy Changes
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15 Terms
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enthalpy change
The ________ is negative in exothermic reactions since heat is lost to the surroundings, while in endothermic reactions, it is positive as heat is gained.
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Fuels
Substances burned in air to produce energy in a process called combustion.
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Carbon monoxide
________ and water are the products of incomplete combustion.
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energy
The ________ required to start the reaction is called the activation ________ (Ea)
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Fuel cells
Chemical cells where reactants are continuously supplied to produce electricity directly.
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Heat enthalpy change
The amount of heat energy involved in the reaction.
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Law of conservation
The law stating that energy can not be created or destroyed, but just changed from one form to another in chemical or physical processes.
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Examples of exothermic reactions
combustion, corrosion, neutralisation, respiration
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Examples of endothermic reactions
photosynthesis, decomposition,
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Exothermic reaction
A chemical reaction accompanied by the evolution of heat.
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Endothermic reaction
A chemical reaction accompanied by the absorption of heat.
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Activation energy
The energy required to start a reaction.
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Fuel Cells
Chemical cells where reactants are continuously supplied to produce electricity directly.
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Complete combustion
Combustion that takes place in the presence of a sufficient amount of oxygen.
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Incomplete combustion
Combustion that takes place when there is an insufficient amount of oxygen supply.
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