exothermic and endothermic reactions Flashcards
(14 cards)
BENDOMEX
breaking endothermic
making exothermic
endothermic
a reaction which takes in heat in its process
exothermic
a reaction which produces heat during its process
describe the temperature change of surroundings for endothermic and exothermic reactions
endothermic has a temp decrease
exothermic has a temp increase
give 3 examples of endothermic reactions
thermal decomposition
photosynthesis
sports injury packs
give 3 examples of exothermic reactions
hand warmers
self heating cans
combustion
respiration
neutralisation reactions
activation energy
the minimum amount of energy required for a reaction to occur
draw the energy profile diagram for an exothermic reaction
draw the energy profile diagram for an endothermic reaction
where are the products in relation to the reactants in each reaction?
endo-products higher
exo-products lower
what does the difference in height represent?
overall energy change
conservation of mass
no atoms are lost or made during chemical reaction - mass of product equals mass of reactants
conservation of energy
the amount of energy in the universe at the end of a chemical reaction is the same as before the reaction takes place.
bond energy exothermic
In an exothermic reaction, the energy released from forming new bonds is greater than the energy needed to break existing bonds.
