Lesson Notes By Weeks and Term - Senior Secondary 1

Crystal structure

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Term: 3rd Term

Week: 3

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:       

Subject:      Physics

Topic:-       Crystal structure

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

  1. Define crystals
  2. State the types of crystals and give examples of each type
  3. Differentiate between crystalline and amorphous substances

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 reviews the previous lesson on the Hooke’s law

Students pay attention

STEP 2

EXPLANATION

He defines and explains crystals. He states the types of crystals and gives examples of each

 

 

Students pay attention and participates

STEP 3

DEMONSTRATION

He explains the differences between crystalline and amorphous substances

 

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

CRYSTAL STRUCTURE

Crystal is a piece of solid matter which has its atoms, molecules or ions arranged in a highly regular repeating pattern or lattice. Solids are divided into Crystalline and non-crystalline or amorphous substance examples of crystalline substance are: Sodium Chloride, Diamond, copper (II) tetraoxosulphate (IV) etc.

Non Crystalline or Amorphous Substance are solids that does not have their molecules arranged in a regular pattern, they are mostly in liquids e.g. Sulphur, Graphite etc.

DIFFERENCES BETWEEN CRYSTALLINE AND ARMORPHOUS SUBSTANCES

 

S/N

CRYSTALLINE SUBSTANCES

ARMORPHOUS SUBSTANCES

1

They have definite shape

They have no definite shape

2

They have definite Boiling and Melting Point

They have no definite Boiling and Melting Point

3

They are soluble in Polar Solvents

They are not soluble in Polar Solvents

4

They can exist either in hydrated or anhydrous form

They exist only in anhydrous form

 

EVALUATION:   1. Define crystals

  1. State the types of crystals, giving two examples of each
  2. Outline three differences between crystalline and amorphous substances

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively