BASIC SCIENCE | WHAT ARE CHEMICALS:J S S 2 E-NOTE

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

Lesson Objectives:

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

Mention common chemicals, both toxic and non-toxic.

Highlight precautions while handling chemicals.

Identify chemical safety signs and their meanings.

Produce homemade chemicals.

BASIC SCIENCE | WHAT ARE CHEMICALS:J S S 2 E-NOTE

Explain What Chemicals Are.

Chemicals are substances with a distinct molecular composition that are produced by or used in a chemical process.

Examples: Discuss examples of common chemicals found in everyday life.

Activity: Show images of common household chemicals and ask students to identify them.

Non-Toxic Chemicals:

Examples: Water (H₂O), Sodium chloride (table salt), Vinegar (acetic acid).

Toxic Chemicals:

Examples: Bleach (sodium hypochlorite), Ammonia, Pesticides.

Activity: Create a Venn diagram to categorize chemicals into toxic and non-toxic.

General Precautions:

Always read labels.

Wear protective gear (gloves, goggles).

Work in a well-ventilated area.

Specific Precautions: Discuss handling specific chemicals like bleach and ammonia.

Activity: Role-play scenarios where students practice safe handling of chemicals.

Common Safety Signs:

Poison (skull and crossbones)

Flammable (flame symbol)

Corrosive (hand and surface being eaten away)

Explosive (explosion symbol)

Activity: Show images of safety signs and have students match them to their meanings.

Safe Experiments:

Baking soda and vinegar reaction.

Making slime using glue and borax.

Procedure: Explain step-by-step how to safely produce these chemicals at home.

Activity: Perform one of the experiments as a class demonstration.

Recap: Briefly review the main points of the lesson.

Q&A: Open the floor for any questions from students.