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17 questions
Given the Born-Haber cycle below, which of the following enthalpy change is not represented by steps a-g
Enthalpy of formation
enthalpy of atomization of calcium
1st electron affinity of bromine
2nd electron affinity of bromine
Identify the enthalpy change represented by letter g.
enthalpy of formation
enthalpy lattice of formation
electro affinity of bromine
enthalpy of atomization of zinc
Calculate the enthalpy change represented by X
+695kJ/mol
-695kJ/mol
-635kJ/mol
-635kJ/mol
which of the following results in decrease in enthropy
1. Calculate the standard entropy change for the following reaction
Cu(s) +1/2 O2(g) =>CUO (s)
Given that
195.66 J/K.mol
93.09 J/K.mol
-93.09 J/K.mol
+195.66 J/K.mol
-41.10 J/mol.K
+165.29J/mol.K
+41.10 J/mol.K
-165.29J/mol.K
-63.8 J/mol.k
+63.8 J/mol.k
+176.7 J/mol.k
-50.7 J/mol.k
-36.6 J/K
-175.7 J/K
-83.4J/K
+83.4J/K
Which equation represents the process that occurs when the standard enthalpy of atomisation of iodine is measured?
0.5I2(s) → I(g)
I2(s) → 2I(g)
0.5I2(g) → I(g)
I2(g) → 2I(g)
Which enthalpy change is NOT required in a Born Haber cycle for aluminium chloride
2nd ionisation energy of aluminium
2nd electron affinity of chlorine
Lattice enthalpy of aluminium chloride
Enthalpy of formation of aluminium chloride
Which equation shows an enthalpy of atomisation?
21 Cl2 (l) → Cl(g)
Cl2 (g) → 2Cl(g)
Cl2 (l) → 2Cl(g)
21 Cl2 (g) → Cl(g)
Standard enthalpy change of combustion is defined as the enthalpy change when
1 mole of compound is burnt in oxygen.
1 mole of compound is completely burnt in oxygen under standard conditions of 298K and 100 KPa.
1 mole of compound is burnt under oxygen at 293K and 100 KPa.
1 mole of oxygen is used to burn a compound under standard conditions of 298K and 100 KPa.
Standard enthalpy change of formation of a substance is defined as
the enthalpy change when 1 mole of the substance is formed from its elements under standard conditions of 298K and 100 KPa.
the energy released when 1 mole of the substance is formed from its elements under standard conditions of 298K and 100 KPa.
the enthalpy change when 1 mole of elements is used to form a substance under standard conditions of 298K and 100 KPa.
the energy released when 1 mole of elements is used to form a substance under standard conditions of 298K and 100 KPa.
Lattice energy of an ionic solid is defined as
the enthalpy change when 1 mole of the ionic solid is formed from its separate ions.
the enthalpy change when 1 mole of the ionic solid is formed from its separate gaseous ions.
the enthalpy change when 1 mole of the ionic solid is separated into its separate gaseous ions.
the enthalpy change required to break 1 mole of ionic bonds to form separate ions.
Standard enthalpy of atomisation is defined as the enthalpy change when
1 mole of atoms is formed in a reaction under standard conditions of 298 K and 100 KPa.
1 mole of separate gaseous atoms of the element is formed from the element under standard conditions of 298 K and 100 KPa.
1 mole of an element is atomised to form separate gaseous atoms under standard conditions of 298 K and 100 KPa.
1 mole of a compound is broken down into its individual atoms under standard conditions of 298 K and 100 KPa.
First ionisation energy (IE) is defined as
the enthalpy change when 1 mole of electrons is removed from 1 mole of atoms to form 1 mole of gaseous cations.
the energy required to remove 1 mole of electrons from 1 mole of cations to form 1 mole of +2 gaseous cations.
the enthalpy change when 1 mole of electrons is removed from 1 mole of separate gaseous atoms to form 1 mole of gaseous cations.
the enthalpy change when 1 mole of electrons is removed from 1 mole of separate atoms to form 1 mole of cations.
Electron affinity (EA) of an element is defined as
the enthalpy change when 1 mole of electrons is added to 1 mole of atoms to form 1 mole of anions.
the enthalpy change when 1 mole of electrons is added to 1 mole of gaseous atoms to form 1 mole of gaseous anions.
the enthalpy change when 1 mole of electrons is added to 1 mole of atoms to form 1 mole of gaseous anions.
the enthalpy change when 1 mole of electrons is added to 1 mole of gaseous anions to form 1 mole of gaseous anions.
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