REDOX reactions Flashcards
redox reactions full name
reduction - oxidation recations
what is a redox reaction
a type of chemical reaction that involves a transfer of electrons between two species
oxidation
the loss of one or more electrons
reduction
the gain of one or more electrons
acronym to remeber oxidation/redduction
OIL RIG
OIL RIG meaning
oxidation is loss, reduction is gain
oxidant
a chemical that causes something else to undergo oxidation, but it itself is reduced
reductant
a chemical that causes something to undergo reduction, but it itself is oxidised
half equations
show either oxidation.reduction and electrons present in them
where are electrons in a reduction reaction
on the reactants side
where are electrons in an oxidation reaction
on the products side
how to identify half equations from full equations
we match up the elements from the reactant side with its partner on the products side
what is one technique used to identify redox reactions
the use of oxidation states
oxidation states
indicate that the charge that an atom may have as a result oof the movement of electrons during oxidation
a change iin oxidation states indicates that…
electrons have either been lost or gained and therefore a redox reaction has occured
oxidation state of a free element is always
zero
free element
an element by itself or bonded to itself
the oxidation state of a simple ion is…
equal to the charge of that ion
a neutral compound, oxidation state…
the sum of the oxidation states of each element in the neutral compound is equal to zero
the oxidation state of a polyatomic ion…
the oxidation state of a polyatomic ion in ths sum of all the oxidation states which equals the charge of the ion
oxidation state for hydrogen in a compound
+1
oxidation state for oxygen in a compound
-2
KOHES stands for
Key element, Oxygen, Hydrogen, Electrons, States
what acronym is used to create half/full equations
KOHES
K in KOHES step
identify any key element, other than O/H and balance these
O in KOHES step
balance oxygen by adding H2O
H in KOHES step
balance hydrogens by adding H+ ions
E in KOHES step
balance charrges by adding electrons
S in KOHES step
include states
