EFFECTS OF AN ELECTRIC CURRENT ON SUBSTANCES.

Molten electrolytes.

By the end of the lesson, the learner should be able to:
To test for electrical conductivities molten electrolytes.

Group experiments- to identify electrolytes in molten form.
Explain the difference in molten electrolytes.

Molten candle wax
Sugar
Sulphur
Lead oxide.

K.L.B. BOOK IIPP. 120-121

EFFECTS OF AN ELECTRIC CURRENT ON SUBSTANCES.

Electrolysis.
Aqueous electrolytes. Electrodes.

By the end of the lesson, the learner should be able to:
To define electrolysis
To describe the process of electrolysis in terms of charge movement.

Descriptive approach punctuated with Q/A.

Graphite electrodes
Battery
Various aqueous solutions switch bulb.

K.L.B. BOOK II

EFFECTS OF AN ELECTRIC CURRENT ON SUBSTANCES.

Reaction on electrodes.
Binary electrolyte.
Application of electrolysis.
Electroplating.

By the end of the lesson, the learner should be able to:
To describe half- equation reactions at the cathode and anode
To state application of electrolysis.

To demonstrate ?Electrolysis of molten lead (II) bromide
Observe colour changes
Explanation of half-equations and reactions at the electrodes.
Discussion and explanations.

Graphite electrodes
Battery
Various aqueous solutions switch.
text book
text book
Silver nitrate
Iron nail
Complete circuit battery.

K.L.B. BOOK II PP.126-127
K.L.B. BOOK II P. 128

CARBON AND SOME OF ITS COMPOUNDS.

Allotropy.
Physical and chemical properties of diamond, graphite and amorphous carbon

By the end of the lesson, the learner should be able to:
Define allotropes and allotropy.
Identify allotropes of carbon.
Represent diamond and graphite diagrammatically.

Teacher exposes new terms.
Review covalent bond.
Discuss boding in diamond and graphite.

text book
Charcoal, graphite.

K.L.B. BOOK II PP. 131-133

CARBON AND SOME OF ITS COMPOUNDS.

Burning carbon and oxygen.
Reduction properties of carbon.
Reaction of carbon with acids. Preparation of CO2.

By the end of the lesson, the learner should be able to:
Describe reaction of carbon with oxygen.

Teacher demonstration- Prepare oxygen and pass dry oxygen into a tube containing carbon. Heat the carbon. Observe effects on limewater.

Carbon, limewater, tube, limewater stand& Bunsen burner.
CuO, pounded charcoal, Bunsen burner& bottle top
Conc. HNO3, limewater.

K.L.B. BOOK II PP. 134-135

CARBON AND SOME OF ITS COMPOUNDS.

Properties of CO2.
Chemical equations for reactions involving CO2.
Uses of CO2.
Carbon monoxide lab preparation.

By the end of the lesson, the learner should be able to:
Describe properties of CO2
State uses of CO2

Simple experiments to determine properties of CO2.

Discuss the observations.

Discuss briefly the uses of CO2.

Lime water,
Magnesium ribbon,
Universal indicator,
lit candle.
text book

K.L.B. BOOK II PP.138-139
K.L.B. BOOK II PP.140-1

CARBON AND SOME OF ITS COMPOUNDS.

Chemical properties of carbon monoxide.
Carbonates and hydrogen carbonates.
Heating carbonates and hydrogen carbonates.

By the end of the lesson, the learner should be able to:
To describe chemical properties of carbon monoxide.

Description of properties of carbon monoxide.
Discussion and writing of chemical equations.

text book

K.L.B. BOOK II PP. 144-145

CARBON AND SOME OF ITS COMPOUNDS.

Extraction of sodium carbonate from trona.
Solvay process of preparing sodium carbonate.

By the end of the lesson, the learner should be able to:
To draw schematic diagram for extraction of sodium carbonates.

Discuss each step of the process.
Write relevant equations.

text book
text book, chart

K.L.B. BOOK II PP. 153-157

CARBON AND SOME OF ITS COMPOUNDS.

Importance of carbon in nature. & its effects on the environment.

By the end of the lesson, the learner should be able to:
To discuss: - Importance of carbon in nature.
&
Effects of carbon on the environment.

Discuss the carbon cycle and processes that increase/ reduce amount of CO2 in the air.
Uses of CO2 in soft drinks and fire extinguishers.

text book

K.L.B. BOOK II PP.157-158