Energy Changes Flashcards
(26 cards)
in what state do ionic compounds conduct electricity?
molten or dissolved
what is an electrolyte?
a liquid that conducts electricity
which electrode do negative ions (anions) go towards?
positive (anode)
which electrode do positive ions (cations) go towards?
negative (cathode)
what is the positive electrode called?
anode
what is the negative electrode called?
cathode
where do the ions become discharged (gaining or losing an electron)
at the electrodes
what substance helps reduce melting point?
cryolite
what is the anode made out of
carbon
which electrode needs to be continually replaced?
anode
is electrolysis cheap
no
at the anode if the ionic compound contains halide ions, what gas is produced?
halogen gas
at the anode if the ionic compound doesn’t contain halide ions, what gas is produced?
oxygen
at the cathode if the metal is more reactive than hydrogen what is formed?
hydrogen
at the cathode if the metal is less reactive than hydrogen what is formed?
metal
what is produced at the anode
a gas (either oxygen or the halogens gas)
what is produced at the cathode?
hydrogen or a metal
what is an exothermic reaction
where energy is lost so temp of surroundings goes up
what is an endothermic reaction
where energy is gained so the temp of surroundings decreases
give an example of an endothermic reaction
ice pack
give an example of an exothermic reaction?
self heating cans
the arrow from the reactant to the peak of reaction is called?
activation energy
the arrow from the reactant to the product is called?
overall energy change
exothermic is bond ___ing
make
