The difference between the atomic number and the number of electrons it has.
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What is electrochemical potential?
It drives electron transfer. The more negative the potential is the more likely the reduction reaction is.
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What happens when an ion is made?
There is a change in the elements enthalpy and entropy.
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What is the standard state for a solution?
when a =1 and we assume that a_i = c/c。
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Describe the Standard hydrogen electrode
It allows the driving force of reactions to be compared. It is E=0V for all temperatures. There are other reference electrodes which are much safer than hydrogen.
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Define current
The rate of flow of electrons.( reductive current is negative)
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Give an equation for electrical power
P=|i|E (where i is current and E is potential
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State the cell symbols and conventions
| : phase boundary ||: Salt bridge ,: co -solute convention: reduction reaction on the right
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What is the relationship between G and E?
Δ_rG= -zFE ] where z: moles of electrons transfered; F: Faraday's constant = 96485
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What is the relationship between T and E?
E= -ΔH/zF + ΔST/zF ; ∂E/∂T = ΔS/zF ] so the relationship between E and T depends on entropy .
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What is the Nernst equation?
To work out E when the conditions are not standard. E=E。- RT/zF (lnQ)
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What is 'Galvanic displacement'?
Ag nano particles converted to hollow Au nano particles.
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Describe corrosion
The removal of metal by electrochemical oxidation. The products are usually stable ions,oxides and salts.
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What is the resistance to corrosion for noble and base metals?
Noble metals resist corrosion in wet air e.gAg ,Pt,Au ; Base metals oxidise readily in wet air e.g. Fe,Ni, Zn,Pb,Al
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How does a battery work?
It converts stored chemical energy into electrical energy.
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How does a fuel cell work?
It converts chemical energy into electrical energy.
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Other cards in this set
Card 2
Front
What is electrochemical potential?
Back
It drives electron transfer. The more negative the potential is the more likely the reduction reaction is.
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