WorksheetsD Block Chemistry
Total questions: 47
Worksheet time: 47mins
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Which of the following d-block elements is not a transition element?
Iron
Zinc
Titanium
Chromium
Which of the following are true about transition elements?
Form coloured ions or compounds
Show catalytic properties
Appear as shiny grey solid
Could form at least one stable simple ion with partially filled d-orbitals.
What is the highest oxidation state of manganese in it's compounds?
+8
+7
+6
+5
Which of the following best explains the action of a transition element as homogeneous catalyst?
It decreases the enthalpy of reaction
It exhibits a variable oxidation states
It supplies energy to increase the rate of effective collision
It supplies electrons to facilitate adsorption through the formation of temporary bonds
A solution of [Cr(H2O)6]3+ ion is violet while the solution of [Cr(OH)4(H2O)2]- ion is grey-green. This is due to the difference in
oxidation state
ligand
charge
counter ion
An element where the last electron added was into a d subshell is the definition of...
Transition Metal
d-block element
catalytic ion
complex ion
What is a ligand
An atom, molecule or ion that forms a dative covalent bond to a central metal ion in a complex.
An atom, molecule or ion that accepts a pair of electron from a central metal ion in a complex.
A central metal ion with one or more covalent bonds to it
A d-block element that has a partially filled d subshell
Which is not an example of a ligand substitution reaction?
[Cu(H2O)6]2+ + 2OH- --> [Cu(H2O)4(OH)2] + 2H2O
[Cu(H2O)6]2+ + 4Cl- --> [Cu(Cl)4]2- + 6H2O
[Cu(H2O)4(OH)2] + 4NH3 --> [Cu(H2O)2(NH3)4]2+ + 2H2O + 2OH-
[Cu(H2O)6]2+ + 3en --> [Cu(en)3]2+ + 6H2O
How many possible d orbitals are there in one shell?
10
5
2
18
How many electrons can fit into the d subshell (all the d orbitals) in one electron shell?
10
5
2
20
Electrons fill orbitals:
starting with the lowest energy and filling up
starting with the highest energy and filling down
starting from the left side of the atom
in whatever order they're written
Electron subshells are most stable
with all orbitals full or all empty
with orbitals exactly 3/4 full
with orbitals exactly 3/4 empty
with orbitals exactly 1/2 full
This is iron0. It loses 3e- to become iron3+. Use stability rules to find its new e- config.
Predict how the valence electrons in iron metal (iron 0) should be organized.
Use your stability and filling rules to predict Cu0's valence shell. (4s and 3d subshells)
A green precipitate that dissolves to form a dark green solution on adding excess NaOH contains
Fe3+
Mn2+
Cu2+
Cr3+
How does a catalyst work in speeding up a reaction?
By lowering the activation energy or reaction
by giving them more energy
by making them more available
The minimum amount of energy needed for colliding particles to react is called the
Chemical Energy
Kinetic Energy
Activation Energy
Potential Energy
What happens to the molecule of C2H4 and H2 at 4?
H2 breaks its bond, bonded on the catalyst surface
Double bond of C2H4 is broken, 2 C atoms bond to catalyst
H atoms migrate, collide with the bound C species and react
Does the catalyst change the position of equilibrium?
Yes
No
In homogeneous catalysis, reactants and catalysts are in the ___________ phase with each other.
Different
Same
In heterogeneous catalysis, reactants and catalysts are in a __________ phase with each other
Different
Same
Which of the following reaction is NOT an example of heterogeneous catalysis?
A
B
C
D
The reactants are ___________ onto the surface of the active sites of the catalyst
Adsorbed
Absorbed
Assimilated
Dissolved
Which of the following is used as a catalyst in the haber process?
V2O5
Fe
Ag2O
SO3
According to adsorption theory of catalysis, the speed of the reaction increases because:
in the process of adsorption, the activation energy of the molecules becomes large.
adsorption produces heat which increases the speed of the reaction
the concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.
adsorption lowers the activation energy of the reaction
Which one of the following is not an example for heterogenous catalysis?
Hydrogenation of oil
Manufacture of ammonia by Haber's process
Manufacture of sulphuric acid by Contact process
Hydrolysis of sucrose in presence of dilute hydrochloric acid
what is the catalyst in the Contact Process?
Vanadium metal
vanadium (V) oxide
iron
vanadium (II) oxide
State the characteristic property of transition metals that enables them to act as catalysts in redox reactions.
can form complexes
ability to form coloured compounds
variable oxidation state
have high melting points
Suggest why ions from s block elements do not usually act as catalysts.
their compounds are white
too reactive
their melting points are too low
only exist in one oxidation state
