Standard electrode potentials
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what is the definition for a standard electrode potential
the voltage produced when a half cell is connected to a hydrogen half cell under standard conditions
what are the standard conditions
298 K, 1 atm, 1 mol dm -3
what is the electrochemical series
ranking metals and non metals by their standard electrode potentials - (oxidising ability and reducing ability)
what are the charge carriers in the wire
electrons
what are the charge carriers in the salt bridge
ions
complete the sentance: the more positive the standard electrode potential the stronger the ________
oxidising ability
complete the sentance: the more negative the standard electrode potential the stronger the ______
reducing ability
what is the definition for standard CELL potential
the voltage obtained when two half cells are connected under standard conditions
what are the limitations of using SEP’s to predicr REDOX reactions
give no indication of the rate of reaction, reaction rate may be very slow, may be very high activation energy majory of reactions will not occur under standard conditions so the actual electrode potential is likely to not be the same as the standard electrode potential
is the reaction feasible if the Ecell sign is positive
yes
is the reaction feasible if the Ecell sign is negative
no
are primary storage cells rechargeable or non rechargeable what kind of redox reaction is this
non rechargeable non reversible
are secondary storange cells rechargeable or non rechargeable. what kind of redox reaction is this
rechargeable reversible
during discharging which direction do electrons flow
most negative to least negative
during charging, which direction do electrons flow
most positive to least positive “flip most positive”
many secondary storage cells are based on lithium-ion electrochemistry: what are the benefits of this?
• Lithium is a light metal giving a high energy density -lithium ion cells are built around a solid polymer, means the cell can be formed into a wide range of shapes and sizes
many secondary storage cells are based on lithium-ion electrochemistry: what are the limitations of this?
• voltage drops with use • can be unstable at high temps • lithium is very reactive so must take care when recycling.
what are the 2 key features of fuel cells
• they have a continuous supply of fuel so do not have to be recharged. • fuel and oxygen flow into the cell, products flow out.
what is the benefit of hydrogen fuel cells
water is the only product ( however fossil fuels still needed to generate hydrogen in first place)