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27 Cards in this Set
- Front
- Back
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What is a characteristic of the transition elements?
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They form compounds and ions with different oxidation states
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What are the different oxidation states of iron?
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2,3,4,5,6
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What are the different oxidation states of copper?
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1,2,3
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What are the two reasons transition metals are good catalysts?
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They have different OSs, they can gain and lose electrons in moving between these OSs - facilitating and speeding up redox reactions
They provide sites at which reactions can take place |
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What is heterogeneous catalysis?
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A reaction in which the catalyst has a different physical state from the reactants
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What is the colour of Cu2+?
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Blue
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What is the colour of Cu(OH)2?
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Blue
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What is the colour of Fe2+?
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Pale green
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What is the colour of Fe(OH)2?
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Green
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What is the colour of Fe3+?
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Yellow/orange
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What is the colour of Fe(OH)3?
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Red-brown/rust
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What is the colour of Co2+?
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Pink
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What is the colour of Co(OH)2?
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Blue green --> Pink
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What is a complex ion?
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A transition metal ion bonded to one ore more ligands by coordinate bonds
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What is a ligand?
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A molecule or ion that can donate a pair of electrons with the transition metal ion to form a coordinate bond
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What is the coordination number?
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The total number of coordinate bonds formed between the central metal ion and any ligands
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What is the bond angle in octahedral complex ions?
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90
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What is the bond angle in tetrahedral complex ions?
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109.5
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What is the bond angle in square planar complex ions?
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90
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Ligands can be neutral or anionic - what does anionic mean?
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Negatively charged
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With cis-trans isomerism of complex ions, what is the bond angle between trans isomers?
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180
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With cis-trans isomerism of complex ions, what is the bond angle between cis isomers?
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90
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What are the requirements for optical isomerism in complex ions? (3)
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Three bidentate
Two bidentate & 2 monodentate One hexadentate |
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MnO4- colour
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Purple
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Mn2+ colour
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Pale pink
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Cr2O7^2- colour
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Orange
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Cr^3+ colour
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Green
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