C7 Energy Changes Flashcards
(20 cards)
What does the voltage of a cell depend on?
The difference in reactivity of the two electrodes
How do you boost the amount of electricity a fuel system produces?
Adding cells
In addition to fuel, what other chemical is needed by a fuel cell?
Oxygen
How do fuel cells generate electricity from hydrogen?
Electrochemical reaction
In a fuel cell, the positive ions (hydrogen ions) are produced at the ___
Anode
In hydrogen fuel cells, at which electrode are electrons accepted?
Negative electrode
Within hydrogen fuel cells, what is supplied at the positive electrode?
Oxygen gas
Within hydrogen fuel cells, what is supplied at the negative electrode?
Hydrogen gas
Which substance donates electrons?
Hydrogen
Which substance accepts electrons?
Oxygen
What is a calorimetry experiment?
An experiment that measures the amount of a heat energy released by a chemical reaction
What is activation energy?
Minimum amount of energy required for a reaction to occur
What is an endothermic reaction?
When energy is taken in from the surroundings
What is an exothermic reaction?
When energy is being transferred to the surroundings
Give examples of an exothermic reaction
Combusion, neutralisation, oxidation
Give examples of endothermic reactions
Thermal decomposition reactions
What is a simple cell?
Two diffirent metals in contact with an electrolyte
What is a battery?
A group of cells that provide a steady source of electrical energy
What are the byproducts of a hydrogen fuel cell?
Water and heat
What is a hydrogen fuel cell?
A cell that produces electricity through a chemical reaction between hydrogen and oxygen
