Term
| Why are 3+ ions more acidic than ethanoic acid? |
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Definition
| They are smaller and are more strongly polarising so weakens bonds between O-H in water ligands |
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Term
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Definition
| The formation of complexes with multidentate ligands |
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Term
Copper metal can be extracted from a dilute aqueous solution containing Cu2+ ions using scrap iron.
What is the equation and colour change? |
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Definition
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Term
| What is the formula of the complex giving pink colour in CoCl2? |
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Definition
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Term
| What is the role of H2O2 in the reaction with [Co(NH3)6]2+? |
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Definition
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Term
| What is formed when excess H2NCH2CH2NH2 is added to [Co(NH3)6]2+? |
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Definition
| [Co(NH3)6]2+ + 3H2NCH2CH2NH2 -> [Co(H2NCH2CH2NH2)3]2+ + 6NH3 |
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Term
| Why is [Co(H2NCH2CH2NH2)3]2+ more stable than [Co(NH3)6]2+? |
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Definition
Entropy/disorder increases for [Co(H2NCH2CH2NH2)3]2+
Four molecules form seven molecules. |
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Term
| Why does [Co(Cl)4]2- have a different coordination number to [Co(H2O)6]2+? |
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Definition
| Cl- ions are larger so only four can fit around the transition metal ion |
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Term
| What reagent is added to [Co(H2O)6]2+ to form a complex that can be oxidised by H2O2 to form [Co(NH3)6]3+? What are the reactions and observations? |
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Definition
Conc. NH3
[Co(H2O)6]2+ + NH3 -> [Co(NH3)6]2+
Pink solution -> pale brown solution
With H2O2:
[Co(NH3)6]2+ -> [Co(NH3)6]3+
Pale brown solution -> darker brown solution |
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Term
| What features of transition metals allow them to have catalytic properties, form complex ions and form coloured solutions? |
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Definition
| They have incomplete d orbitals |
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Term
| Transition metals have catalytic properties, form complex ions and form coloured solutions. What is the fourth characteristic? |
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Definition
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Term
| What is an example of a linear complex? |
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Definition
[H3N-Ag-NH3]+
[Cl-Ag-Cl]–
Cl-Be-Cl |
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Term
| What is an example of a square planar complex? |
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Definition
| A cis platin drawn out as square planar |
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Term
| What is an example of a tetrahedral complex? |
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Definition
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Term
| What is the overall equation for the contact process? |
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Definition
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Term
| What is the meaning of heterozygous when applied to a catalyst? |
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Definition
| The catalyst is in a different state to the reactants |
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Term
| What are the two equations of the Contact Process demonstrating how vanadium(V) oxide acts as a catalyst? |
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Definition
V2O5 + SO2 -> V2O4 + SO3
V2O4 + 1/2O2 -> V2O5 |
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Term
| What can be done to a catalyst to maximise ifs efficiency? |
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Definition
| Finely divided to maximise surface area |
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Term
| What is the meaning of multidentate? |
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Definition
| Forms more than one coordinate bond with a central transition metal ion |
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Term
| When cobalt(II) is coordinated to a porphyrin ring (it forms 4 coordinate bonds), a cyanide ion (CN-) and another unidentate ligand, what is its coordination number? |
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Definition
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Term
| When cobalt(II) is coordinated to a porphyrin ring, a cyanide ion (CN-) and another unidentate ligand, why is it not toxic even though the cyanide ion is very toxic? |
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Definition
| The cyanide ion is very strongly bound to cobalt |
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