Chem 5

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  • Created by: Sopha8
  • Created on: 14-06-15 16:39
What species goes on the right and left side of a cell diagram? what happens to that species?
right=biggest E value, best oxidising agent so is reduced. Left=lowest E value, best reducing agent so is oxidised
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What are the equations used to work out total entropy change?
:
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What is used to oxidise a 2+ ion to a 3+ ion? what are the products?
reagent=H2O2
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When must you include state symbols in an equation?
if it states so in the question or you are writing an equation for electron affinity, atomisation or ionisation
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How can the equation for free energy change be rearranged to get a) T b)entropy change or c) enthalpy change?
:
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write the equation for the reaction of an aqueous 2+ ion with diethlyamine
:
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Is lattice dissociation positive or negative? what about formation?
dissociation=positive as bonds broken is endothermic. formation= negative as bonds made is exothermic
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How do you form a balanced equation?
1-balance atoms not O or H 2-balance O by adding H2O 3-balance H by adding H+ 4-balance charge by adding electrons
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How can you maximise the efficiency of a heterogeneous catalyst?
increase surface area by spreading on mesh or using power
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What properties of platinum make it good as a electrode?
inert and conducts electricity
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What complex is produced with aqueous Al 3+ and Cr 3+ ions when they are reacted with excess OH-?
:
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Why would one ion have a lower enthalpy of hydration than another?
charge density is higher so more strongly attracted to delta+ on H (water is polar)
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Why would your calculated enthalpy be different to one in data book?
mean bond enthalpy used as enthalpy of that bond is different depending on environment its in
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What happens at the positive and negative electrodes?
Positively charged ions migrate to the negative electrode, they gain electrons and are reduced. Negatively charged ions migrate to the positive electrode, they lose electrons and are oxidised
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Card 2

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What are the equations used to work out total entropy change?

Back

:

Card 3

Front

What is used to oxidise a 2+ ion to a 3+ ion? what are the products?

Back

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Card 4

Front

When must you include state symbols in an equation?

Back

Preview of the front of card 4

Card 5

Front

How can the equation for free energy change be rearranged to get a) T b)entropy change or c) enthalpy change?

Back

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