Lesson Notes By Weeks and Term - Senior Secondary 3

Giant Molecules 2

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TERM׃ IST TERM

WEEK TEN

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Chemistry

Topic: Giant molecules 2

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Explain the hydrolysis of sucrose
  2. Explain the hydrolysis of starch

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the hydrolysis of sucrose to the students.

 

Students pay

attention

STEP 2

EXPLANATION

Teacher explains the hydrolysis of starch

Students pay

attention and

participate

 

STEP 3

DEMONSTRATIO

N

Teacher takes students on a visit to a local sugar factory.

 

Students pay

attention and

participate

STEP 4

NOTE TAKING

The teacher writes a summarized

note on the board

 

The students

copy the note in

their books

NOTE

GIANT MOLECULES 2

Hydrolysis of sucrose

The hydrolysis of sucrose involves the breakdown of sucrose (a disaccharide) into its monosaccharide components, glucose, and fructose. This reaction is catalyzed by the enzyme sucrase. The chemical equations for the hydrolysis of sucrose from breaking down of sucrose to formation of monosaccharides can be represented as follows:

  1. Breakdown of sucrose into glucose and fructose:

  C12H22O11 + H2O   {Sucrase}C6H12O6 + C6H12O6

  1. Formation of glucose:

   C12H22O11 + H2O  {Sucrase}  2C6H12O6

  1. Formation of fructose:

   C12H22O11 + H2O  {Sucrase} 2C6H12O6

Hydrolysis of Starch

The hydrolysis of starch involves breaking down the polysaccharide starch into its constituent glucose units. This process is facilitated by enzymes known as amylases. The chemical equation for the hydrolysis of starch can be represented as follows:

 (C6H10O5)n + nH2O  {Amylase}} nC6H12O6

In this equation:

- (C6H10O5)n) represents the starch molecule (a polymer of glucose).

- n signifies the variable number of glucose units in the starch polymer.

- Amylase is the enzyme that catalyzes the hydrolysis reaction.

NOTE: These process involves the enzymatic cleavage of the glycosidic bonds between glucose units, resulting in the production of individual glucose molecules.

EVALUATION:  1. Discuss the hydrolysis of sucrose

  1. Discuss the hydrolysis of starch

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively