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What is an exothermic reaction
This is a reaction that releases heat energy into the surroundings
Examples are neutralization and combustion
What is an endothermic reaction
This is a reaction that takes heat in from the environment meaning that the temperature of the environment decreases
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What is activation energy
This is the minimum amount of energy needed for a collision to be successful
What is the reaction profile of an exothermic reaction
What is the reaction profile of an endothermic reaction
What type of process is bond breaking e
endothermic
What type of process is bond making
Exothermic
What type of reaction is more energy absorbed than released
Endothermic
What type of reaction is more energy released than absorbed
Exothermic
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Advantages of fuel cells
They do not produce any pollution
They produce more energy per kilogram than either petrol or diesel
No power is lost in transmission as there are no moving parts, unlike an internal combustion engine
No batteries to dispose of which is better for the environment
Continuous process and will keep producing energy as long as fuel is supplied
Disadvantages of hydrogen cell
Materials used in producing fuel cells are expensive
High pressure tanks are needed to store the oxygen and hydrogen in sufficient amounts which are dangerous and difficult to handle
Fuel cells are affected by lowtemperatures, becoming less efficient
Hydrogen is expensive to produce and store
What reactions occur in an hydrogen fuel cell
