CHEMICAL FAMILIES

Chemical properties of alkaline earth metals. Reaction of alkaline earth metals with oxygen.

By the end of the lesson, the learner should be able to:
To describe reaction of alkaline earth metals with oxygen

Q/A: Review reactions of Mg, Ca, with oxygen.
The corresponding word and then chemical equations are then written and their correctness verified by the teacher.

text book

K.L.B. BOOK IIP. 38

CHEMICAL FAMILIES

Chemical properties of alkaline earth metals. Reaction of alkaline earth metals with water.
Reaction of alkaline earth metals with chlorine gas.
Reaction of alkaline earth metals with dilute acids.
Chemical formulae of alkaline earth metals.

By the end of the lesson, the learner should be able to:
To describe reaction of alkaline earth metals with water.
To write balanced equations for reactions of alkaline earth metals with dilute acids.

Q/A: Review reaction of metals with water.
Writing down word and balanced chemical equations for the reactions.
Deduce and discuss the order of reactivity down the group.

Changing word to chemical equations.
Supervised practice.

Some alkaline earth metals.
Sodium, chlorine.
revision book
text book

K.L.B. BOOK IIP. 39
K.L.B. BOOK II PP. 43

CHEMICAL FAMILIES

Uses of some alkaline earth metals and their compounds.
Halogens. Physical properties of halogens.
Comparative physical properties of halogens.
Chemical properties of halogens.

By the end of the lesson, the learner should be able to:
State uses of alkaline earth metals.

Descriptive approach: Teacher elucidates uses of alkaline earth metals.

text book
Iodine crystals, electrical wire, a bulb.
Chlorine, iron wool, bromine.

K.L.B. BOOK II PP. 45-47

CHEMICAL FAMILIES

Equations of reaction of halogens with metals.
Reaction of halogens with water.

By the end of the lesson, the learner should be able to:
To write balanced chemical equations of reactions involving halogens.

Re-write word equations as chemical equations then balance them.
Supervised practice.

text book
Chlorine gas, litmus papers.

K.L.B. BOOK II P. 50

CHEMICAL FAMILIES
STRUCTURE & BONDING
STRUCTURE & BONDING

Some uses of halogens and their compounds.
Noble Gases. Comparative physical properties of noble gases.
Uses of noble gases.
Chemical bonds. Ionic bond.
Ionic bond representation.
Grant ionic structures.
Physical properties of ionic compounds.
Covalent bond.
Co-ordinate bond.

By the end of the lesson, the learner should be able to:
To state uses of halogens and their compounds.
Describe the crystalline ionic compound.
Give examples of ionic substances.

Teacher elucidates uses of halogens and their compounds.
Discuss the group ionic structures of NaCl.
Teacher gives examples of other ionic substances: KNO3, potassium bromide, Ca (NO3)2, sodium iodide.

text book
Chart- dot and cross diagrams.
Models for bonding.
Giant sodium chloride model.
text book

K.L.B. BOOK II pp 52
K.L.B. BOOK II PP 56-58

STRUCTURE & BONDING

Molecular structure.
Trend in physical properties of molecular structures.
Giant atomic structure in diamond.
Giant atomic structure in graphite.
Metallic bond. Uses of some metals.

By the end of the lesson, the learner should be able to:
To describe the molecular structure.
To give examples of substance exhibiting molecular structure

Discussion ? To explain formation of the giant structure and give examples of substance exhibiting molecular structure.

text book
Sugar, naphthalene, iodine rhombic sulphur.
Diagrams in textbooks.

K.L.B. BOOK IIP 65

PROPERTIES AND TRENDS ACROSS PERIOD THREE

Physical properties of elements in periods.
Physical properties of elements in period 3.
Chemical properties of elements in period 3.
Chemical properties of elements in the third period.

By the end of the lesson, the learner should be able to:




To compare electrical conductivity of elements in period 3

Group experiments- Construct electrical circuits incorporating a magnesium ribbon, then aluminum foil, then sulphur in turns.
The brightness of the bulb is noted in each case.
Discuss the observations in terms of delocalised electrons.

The periodic table.

K.L.B. BOOK IIP. 76

PROPERTIES AND TRENDS ACROSS PERIOD THREE
SALTS
SALTS

Oxides of period 3 elements.
Chlorides of period 3 elements.
Types of salts.
Solubility of salts in water.
Solubility of bases in water.
Methods of preparing various salts.
Direct synthesis of a salts.

By the end of the lesson, the learner should be able to:
To identify bonds across elements in period 3.
To explain chemical behavior of their oxide.
To test solubility of various bases in water.
To carry out litmus test on the resulting solutions.

Comparative analysis, discussion and explanation.
Class experiments- Dissolve salts in 5cc of water.
Record the solubility in a table,
Carry out litmus tests.
Discuss the results.

The periodic table.
text book
Sulphates, chlorides, nitrates, carbonates of various metals.
Oxides, hydroxides, of various metals, litmus papers.
CuO, H2SO4, HCl, NaOH, PbCO3, dil HNO3.
Iron,
Sulphur

K.L.B. BOOK II P. 84
K.L.B. BOOK IIPP. 94-95

SALTS
EFFECTS OF AN ELECTRIC CURRENT ON SUBSTANCES.

Ionic equations.
Effects of heat on carbonates.
Effects of heat on nitrates.
Effects of heat on sulphates.
Hygroscopy, Deliquescence and Efflorescence.
Uses of salts.
Electrical conductivity.

By the end of the lesson, the learner should be able to:
To identify spectator ions in double decomposition reactions.
To write ionic equations correctly.

Q/A: Ions present in given reactants.
Deduce the products of double decomposition reactions.
Give examples of equations.
Supervised practice.

PbNO3, MgSO4 solutions.
Various carbonates.
Common metal nitrates.
Common sulphates.
Various solids, bulb, battery, & wires.

K.L.B. BOOK II