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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.
Fuels
Substances burned in air to produce energy in a process called combustion.
Carbon monoxide
________ and water are the products of incomplete combustion.
energy
The ________ required to start the reaction is called the activation ________ (Ea)
Fuel cells
Chemical cells where reactants are continuously supplied to produce electricity directly.
Heat enthalpy change
The amount of heat energy involved in the reaction.
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.
Examples of exothermic reactions
combustion, corrosion, neutralisation, respiration
Examples of endothermic reactions
photosynthesis, decomposition,
Exothermic reaction
A chemical reaction accompanied by the evolution of heat.
Endothermic reaction
A chemical reaction accompanied by the absorption of heat.
Activation energy
The energy required to start a reaction.
Fuel Cells
Chemical cells where reactants are continuously supplied to produce electricity directly.
Complete combustion
Combustion that takes place in the presence of a sufficient amount of oxygen.
Incomplete combustion
Combustion that takes place when there is an insufficient amount of oxygen supply.
Note 
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