Lesson Notes By Weeks and Term - Senior Secondary 1

Term: 2^nd Term

Week: 11

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:       

Subject:      Chemistry

Topic:-       Acids, Bases and Salts III

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

1. Explain Deliquescent, efflorescent and Hygroscopic 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 neutralization and the preparation of soluble and insoluble salts	Students pay attention
STEP 2 EXPLANATION	He explains deliquescent and efflorescent	Students pay attention and participates
STEP 3 DEMONSTRATION	He explains hygroscopic 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

ACIDS, BASES AND SALTS

HYGROSCOPIC, DELIQUESCENT AND EFFLORESCENT SUBSTANCES

1. Hygroscopic substances are capable of absorbing water from the air and not dissolving in it. Silica gel, conc. H₂SO₄, MgCO₃, K₂CO₃, Ca
2. Deliquescent substances are capable of absorbing moisture from the atmosphere and dissolving in it to form a solution. E.g anhydrous CaCl₂, MgCl₂, Cu(NO₃)₂, NaOH pellet
3. Efflorescent substances these are capable of losing their water of crystallization when exposed to the atmosphere. E.g NaCO₃.10.H₂O, MgSO₄.7H₂O, CuSO₄.5H₂O

 

EVALUATION:    1. Write short notes on

1. Hygroscopic substances
2. Deliquescent substances
3. Efflorescent substances

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively