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WorksheetsIB Chemistry HL
Total questions: 23
Worksheet time: 46mins
Which statements are correct for ionic compounds?
I. Lattice energy increases as ionic radii increase.
II. Within the same group, the melting point of salts tends to decrease as the radius of the cation increases.
III. Solubility in water depends on the relative magnitude of the lattice energy compared to the hydration energy.
I and II only
I and III only
II and III only
II and III only
What is the standard enthalpy of formation, in kJ mol–1, of IF (g)?
IF7 (g) + I2 (s) → IF5 (g) + 2IF (g) ΔH = –89 kJ
ΔHf (IF7) = –941 kJ mol–1
ΔHf (IF5) = –840 kJ mol–1
–190
–95
+6
+95
Which equation represents the lattice enthalpy of magnesium sulfide?
MgS (s) → Mg (g) + S (g)
MgS (s) → Mg+ (g) + S– (g)
MgS (s) → Mg2+ (g) + S2– (g)
MgS (s) → Mg (s) + S (s)
The rate expression for the reaction X (g) + 2Y (g) → 3Z (g) is
rate = k[X]0 [Y]2
By which factor will the rate of reaction increase when the concentrations of X and Y are both increased by a factor of 3?
6
9
18
27
Which combination describes the PH4+ ion?
Tetrahedral; sp3 hybridization
Square Planar, sp3 hybridization
Tetrahedral, sp2 hybridization
Square Planar, sp2 hybridization
Which species have resonance structures?
I. Ozone, O3
II. Carbon dioxide, CO2
III. Benzene, C6H6
I and II only
I and III only
II and III only
I, II and III
Which equation represents enthalpy of hydration?
Na(g) → Na+(aq) + e−
Na+(g) → Na+(aq)
NaCl(s) → Na+(g) + Cl−(g)
NaCl(s) → Na+(aq) + Cl−(aq)
Which combination of ΔH θ and ΔS θ will result in a non-spontaneous reaction at all temperatures?
ΔH θ - Positive; ΔS θ - Negative
ΔH θ - Negative; ΔS θ - Positive
ΔH θ - Positive; ΔS θ - Positive
ΔH θ - Negative; ΔS θ - Negative
What are the units for the rate constant, k, in the expression?
Rate = k [X]2[Y]
mol2 dm−6 s−1
mol−1 dm3 s−1
mol dm−3 s−1
mol−2 dm6 s−1
Which molecule is chiral?
2-chlorobutane
2,2-dichloropentane
Propan-2-amine
4-hydroxybutanoic acid
What is the charge on the iron(III) complex ion in [Fe(OH)2(H2O)4]Br?
0
1+
2+
3+
Which statement is correct?
Sigma bonds are formed only by the combination of s atomic orbitals.
Pi bonds can be formed in the absence of sigma bonds.
Pi bonds are formed parallel to the axis between atoms.
Pi bonds are formed only by the combination of hybrid orbitals.
Which ion’s hydration energy is the most exothermic?
Li+
Na+
Br–
I–
Which is correct about reaction mechanisms?
A species that is zero order does not take part in the reaction.
A catalyst does not take part in the reaction.
Reactants in a fast step before the slow step are included in the rate expression.
Reactants in a fast step after the slow step are included in the rate expression.
Ammonia is a stronger ligand than water. Which is correct when concentrated aqueous ammonia solution is added to dilute aqueous copper(II) sulfate solution?
The d-orbitals in the copper ion split.
There is a smaller splitting of the d-orbitals.
Ammonia replaces water as a ligand.
The colour of the solution fades.
What is the correct explanation for the colour of [Cu(H2O)6]2+?
Light is absorbed when an electron moves to a d orbital of higher energy.
Light is released when an electron moves to a d orbital of higher energy.
Light is absorbed when electrons move from the ligands to the central metal ion.
Light is absorbed when electrons move between d and s orbitals.
Which best explains why transition metal complexes are coloured?
As electrons return to lower energy levels, light of a certain colour is emitted, and the complementary colour is observed.
As electrons return to lower energy levels, light of a certain colour is emitted, so the complex appears to have the same colour.
As electrons are promoted to higher energy levels, light of a certain colour is absorbed, and the complementary colour is observed.
As electrons are promoted to higher energy levels, light of a certain colour is absorbed, so the complex appears to have the same colour.
Which ionic compound has the largest value of lattice enthalpy?
MgS
MgO
CaBr2
NaF
Which statement about a first-order reaction is correct?
The reactant concentration decreases linearly with time.
The reactant concentration decreases exponentially with time.
The rate of reaction remains constant as the reaction proceeds.
The rate of reaction increases exponentially as the reaction proceeds.
Consider the rate expression:
Rate = k[X][Y]
Which change decreases the value of the rate constant, k?
Increase in the reaction temperature
Decrease in the reaction temperature
Increase in the concentration of X and Y
Decrease in the concentration of X and Y
An equal amount of each of the following salts is added separately to the same volume of water.
Which salt will have the greatest effect on the pH of water?
Al(NO3)3
Na2SO4
RbCl
KBr
The first ionization energies (in kJ mol-1 ) of five successive elements in the periodic table are:
1314, 1681, 2081, 496 and 738
What could these elements be?
d-block elements
The last two elements of one period and the first three elements of the next period
The last three elements of one period and the first two elements of the next period
The last five elements of a period
What are the units of the rate constant for a zero-order reaction?
s
s-1
mol-1 dm3 s-1
mol dm-3 s-1
