Topic 10 Group 2

The following are high-level thinking skills (KBAT) questions designed based on the learning outcomes provided:

10.0 Group 2

10.1 Selected Group 2 elements and their compounds

1. Explain the reason why it happens towards the trend in physical properties of group 2 when down to group, discussion in relation to; atomic radius, first ionisation energy, electronegativity, melting/ boiling point, and atomisation energies. Give the reason why for each trend involved.

2. Arrange in table form, the elements in group 2 of reaction with water, discussion in relation to; reaction condition of water, reaction equation, Ksp, and solubility.

3. Arrange in table form, the elements in group 2 of reaction reactivity with oxygen.

4. Arrange in table form, the oxides in group 2 of their melting point.

5. Arrange in table form, the metal oxide of group 2 reaction with water, and find the rate of formation of base.

6. Arranged in table form, the thermal decomposition of nitrates, carbonates, and hydroxide of group 2 elements went down to the group in terms of the charge density and polarisability of large anions.

7. Arrange in table form, the rate solubility of hydroxide, and sulphate of Group 2 elements in terms of the relative magnitudes of the enthalpy change of hydration for the relevant ions and the corresponding lattice energy.

10.2 Anomalous behaviour of beryllium

1. Explain the anomalous behaviour of beryllium as exemplified by the formation of covalent compounds.

2. Describe the diagonal relationships between beryllium and aluminium.

3. Explain the similarity of aqueous beryllium salts to aqueous aluminium salts in terms of their acidic property.

10.3 Uses of Group 2 compounds

1. State the uses of Group 2 compounds in agriculture, industry and medicine.

Group 2

10.1 Selected Group 2 elements and their compounds

Candidates should be able to:

(a) describe the trends in physical properties of Group 2 elements: Mg, Ca, Sr, Ba;

(b) describe the reactions of Group 2 elements with oxygen and water;

(c) describe the behaviour of the oxides of Group 2 elements with water;

(d) explain qualitatively the thermal decomposition of the nitrates, carbonates and hydroxides of Group 2 elements in terms of the charge density and polarisability of large anions;

(e) explain qualitatively the variation in solubility of sulphate of Group 2 elements in terms of the relative magnitudes of the enthalpy change of hydration for the relevant ions and the corresponding lattice energy.

10.2 Anomalous behaviour of beryllium

Candidates should be able to:

(a) explain the anomalous behaviour of beryllium as exemplified by the formation of covalent compounds;

(b) describe the diagonal relationships between beryllium and aluminium;

(c) explain the similarity of aqueous beryllium salts to aqueous aluminium salts in terms of their acidic property.

10.3 Uses of Group 2 compounds

Candidates should be able to:

(a) state the uses of Group 2 compounds in agriculture, industry and medicine.

10 Group 2

10.1 Selected Group 2 elements and their compounds

Candidates should be able to:
(a) describe the trends in physical properties of Group 2 elements: Mg, Ca, Sr, Ba;

(b) describe the reactions of Group 2 elements with oxygen and water;

(c) describe the behaviour of the oxides of Group 2 elements with water;

(d) explain qualitatively the thermal decomposition of the nitrates, carbonates and hydroxides of Group 2 elements in terms of the charge density and polarisability of large anions;

(e) explain qualitatively the variation in solubility of sulphate of Group 2 elements in terms of the relative magnitudes of the enthalpy change of hydration for the relevant ions and the corresponding lattice energy.

10.2 Anomalous behaviour of beryllium

Candidates should be able to:

(a) explain the anomalous behaviour of beryllium as exemplified by the formation of covalent compounds;

(b) describe the diagonal relationships between beryllium and aluminium;

(c) explain the similarity of aqueous beryllium salts to aqueous aluminium salts in terms of their acidic property.

10.3 Uses of Group 2 compounds

Candidates should be able to:

(a) state the uses of Group 2 compounds in agriculture, industry and medicine.

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