677778
Pregunta 1
Pregunta
A transitional element is a d block element that forms at least one ion with an incomplete d sub-shell.
Respuesta
- True
- False
Pregunta 2
Pregunta
the d-block elements would have filled their 4s orbitals before their 3d orbitals( the 4s sub-shell has a lower energy than the 3d sub-shell ).
Respuesta
- True
- False
Pregunta 3
Pregunta
chromium which is a transition metal has its 3d and 4s orbitals half-filled(4s1 3d5)
Respuesta
- True
- False
Pregunta 4
Pregunta
copper only one electron is in the 4s orbital but the 3d orbital is full
Respuesta
- True
- False
Pregunta 5
Pregunta
To form positive ions transition element atoms loose electrons from their 4s sub-shell before their 3d subshell.
Respuesta
- True
- False
Pregunta 6
Pregunta
Properties specific to transition metal compounds in result to of their electron configuration(partially filled d-orbitals):
Respuesta
-
exist as giant metallic lattices containing delocalised electrons which move to conduct electricity
-
shiny in appearance
-
catalyse chemical reactions
-
high density and melting point and boiling point
-
form coloured compounds
-
form compounds in which they have different oxidation states
Pregunta 7
Pregunta
transition metals from titanium to copper don't form the +2 oxidation state
Respuesta
- True
- False
Pregunta 8
Pregunta
KMnO4 is a purple solid used as a oxidising agent in redox titrations
Respuesta
- True
- False
Pregunta 9
Pregunta
important chemical reactions that are catalysed by transition metals or their compounds
Respuesta
-
Haber process
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polymerisation
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Hydrogenation of alkenes
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acid hydrolysis
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Contact process
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Decomposition of hydrogen peroxide
Pregunta 10
Pregunta
All ligands are neutral
Respuesta
- True
- False
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