Flashcards
Redox Flashcards
Flashcards do conjunto (23)
- 1what is oxidationOxidation is loss of electrons
- 2what is reductionreduction is gain of electrons
- 3what are the exception of Oxygens usual oxidation stateH202 -1 and OF2 +2
- 4What are the exception of Hydrogens usual oxidation statemetal hydrides (NaH) -1
- 5What are the exceptions of Cl usual oxidation state-1 when combined with O or F
- 6Oxidation is an....increase in oxidiation number
- 7reduction is when....there is a decrease in oxidation number
- 8Name the reactivity series of metals (from strongest reducing agent to weakest)Mg, Al, Zn, Fe, Pb, Cu, Ag
- 9Halide reactivity series (from strongest oxidizing agent to weakest)F, Cl, Br, I
- 10what occurs at the anode ?Oxidation
- 11What occurs at the cathode?Reduction
- 12which way do electrons flow in a voltaic cell?flow from the anode to the cathode
- 13What is the purpose of a salt bridge?It enables the negative charge to be carried in the opposite direction to that of the electrons- which neutralizes any build up of charge and maintains the potential difference
- 14Define standard electrode potentialthe standard electrode potential of a half cell is its electrode potential relative to a hydrogen half-cell measured under standard conditions
- 15standard hydrogen electrode conditionsH2 gas at 298 and 100 kPa, platinum electrode, acid solution containing 1.0 mol dm -3 H+
- 16standard electrode potential conditionsconcentrations of 1.0 mol dm-3
all gases with a pressure of 100 kPa
all substances must be pure
temp of 298K/25 c
if the half cell does not contain metal then platinum electrode - 17In a voltaic cell which half cell is the cathode?the half cell with the more positive electrode potential
- 18In a voltaic cell which half-cell is the anode?the half cell with the more negative cell potential
- 19How to calculate Ecell?E halfcell where reduction occurs - E half cell where oxidation occurs
- 20Spontaneity of positive Ecell valuesSpontaneous
- 21Spontaneity of Ecell negativeNon-spontaneous as written- reverse reaction is spontaneous
- 22electroplating features?an electrolyte containing the metal ions which are to be deposited
the cathode made of the object to be plated
anode made of the same metal which will be coated - 23what factors affect the amount of product in electrolysisthe charge on the ion
the current
the duration of the electrolysis