energy changes Flashcards
what does energy do in exothermic reactions
from a chemical reaction to the surroundings
what does energy do in endothermic reactions
from the surroundings to a chemical reaction
what are types of exothermic reactions
combustion, oxidation, neutralisation
what are types of endothermic reactions
thermal decomposition, citric acid+baking soda
what are the requirements for a successful reaction to take place
collisions, activation energy
how can the voltage output be changed in a cell?
changing the type of electrode/electrolyte.
what is a non-rechargeable battery
irreversible reactions take place at the electrode, once the reacting chemical has rn out the battery will die
what is a rechargeable battery
connection to an electrical current reverses the reaction at the electrode, can be recharged/reused
what are advantages to fuel cells
high efficiency, less pollution than traditional methods, compact, lightweight, reliable
what are the advantages to a hydrogen fuel cell
no toxic waste (only water), short lifetime but can be reused, large capacity,
