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WorksheetsIB Chem Mock Exam Review HL
Total questions: 20
Worksheet time: 40mins
Which one of the equations below represents a reaction that is feasible at all temperatures?
P(s) → Q(s) + R(g) endothermic
2L(g) + M(g) → 2N(g) exothermic
S(g) → 2T(g) exothermic
A(g) + B(g) → C(g) endothermic
The removal of silicon dioxide with limestone in the Blast Furnace can be represented by the following equation.
CaCO3(s) + SiO2(s) → CaSiO3(l) + CO2(g)
Which one of the following statements is not correct?
There is an increase in entropy during this reaction.
The calcium silicate formed floats on the surface of the molten iron.
The calcium silicate formed can be used in the construction industry.
Silicon dioxide is a basic oxide.
A 0.100 mol dm–3 solution of X is found to have a pH of 2.50. The value of Ka in mol dm–3 is
3.16 × 10–2
3.16 × 10–3
1.00 × 10–4
1.00 × 10–5
The following information concerns the gas-phase reaction of nitrogen monoxide with hydrogen.
2NO(g) + 2H2(g) ⇌ N2(g) + 2H2O(g)
A series of experiments was carried out in a reaction vessel at constant temperature. The initial rate of reaction increased by a factor of 2 when the initial pressure of NO was doubled and that of H2 was halved. When both pressures were halved, the initial rate decreased by a factor of 8.
Which of the following are correct statements.
1 the overall order of reaction is 2.
2 the reaction is first order with respect to hydrogen.
3 the reaction is first order with respect to nitrogen monoxide.
4 the overall order of reaction is 3.
1, 2 and 3 only correct
1 and 3 only correct
2 and 4 only correct
4 only correct
Which of the following are Lewis bases:
1 H2O
2 NH4+
3 Cl–
4 C2H6
1, 2 and 3 only correct
1, 2 and 3 only correct
2 and 4 only correct
4 only correct
Which of the following are correct:
1 1.713 g of barium hydroxide is neutralised exactly by 100 cm3 of 0.100 mol dm–3 sulphuric acid.
2 in sulphuric acid, the oxidation state of sulphur is +6.
3 the pH of 0.0200 mol dm–3 sulphuric acid is 1.70.
1, 2 and 3 only correct
1 and 2 only correct
2 and 3 only correct
1 only correct
What is the value of ∆H (in kJ mol−1 ) for the reaction below?
124
101
-101
-124
When ∆Gθ for a reaction is negative, the reaction is
fast
endothermic
reversible
spontaneous
For a gaseous reaction, the equilibrium constant expression is shown in the image.
Which equation corresponds to this equilibrium expression?
4NH3 + 5O2 ⇌ 4NO + 6H2O
4NO + 6H2O ⇌ 4NH3 + 5O2
8NH3 + 10O2 ⇌ 8NO + 12H2O
2NO + 3H2O ⇌ 2NH3 +5/2O2
The standard electrode potentials for Al and Mn are given below:
Al3+(aq) + 3e− ⇌ Al(s) Eθ(V) = −1.66 V
Mn2+(aq) + 2e− ⇌ Mn(s) Eθ(V) = −1.18 V
What is the potential of a cell prepared with these metals in contact with 1.0 mol dm−3 solutions of their ions?
0.22 V
0.48 V
2.84 V
3.43 V
What is the molecular shape and the hybridization of the nitrogen atom in NH3 ?
Molecular shape: tetrahedral
Hybridization: sp3
Molecular shape: trigonal planar
Hybridization: sp2
Molecular shape: trigonal pyramidal
Hybridization: sp2
Molecular shape: trigonal pyramidal
Hybridization: sp3
Which statement about sigma and pi bonds is correct?
Sigma bonds are formed only by s orbitals and pi bonds are formed only by p orbitals.
Sigma bonds are formed only by p orbitals and pi bonds are formed only by s orbitals.
Sigma bonds are formed by either s or p orbitals, pi bonds are formed only by p orbitals.
Sigma and pi bonds are formed by either s or p orbitals.
What is the definition of the half life for a first-order reaction?
The time required for the quantity of a reactant to decrease by half.
Half the time required for a reactant to be completely used up.
Half the time required for a reaction to reach its maximum rate.
The time required for a reaction to reach half of its maximum rate.
Values of a rate constant, k, and absolute temperature, T, can be used to determine the activation energy of a reaction by a graphical method. Which graph produces a straight line?
k versus T
k versus 1/T
ln k versus T
ln k versus 1/T
Which equation represents an acid-base reaction according to the Lewis theory but not according to the Brønsted-Lowry theory?
CO32− (aq) + 2H+ (aq) → H2O(l) + CO2 (g)
Cu2+(aq) + 4NH3(aq) → Cu(NH3)42+(aq)
BaO(s) + H2O(l) → Ba2+ (aq) + 2OH− (aq)
NH3 (g) + HCl(g) → NH4Cl(s)
Which curve is produced by the titration of a 0.1 mol dm−3 weak base with 0.1 mol dm−3 strong acid?
What type of bonding occurs between the metal ion and ligand in the complex ion
[Cu(H2O)6]2+?
metallic
ionic
hydrogen
dative covalent
Which is an essential feature of a ligand?
a negative charge
an odd number of electrons
the presence of two or more atoms
the presence of a non-bonding pair of electrons
The relative first ionisation energies of four elements with consecutive atomic numbers below 20 are shown on the graph.
One of the elements reacts with hydrogen to form a covalent compound with formula HX. Which element could be X?
A
B
C
D
The definitions of many chemical terms can be illustrated by chemical equations. Which terms can be illustrated by an equation that includes the formation of a positive ion?
1 first ionisation energy
2 heterolytic fission of a covalent bond
3 enthalpy change of atomisation
1, 2 and 3 are correct
1 and 2 only are correct
2 and 3 only are correct
1 only is correct
