Chemistry of Selected Metals and their Compounds

Grade 12 · Chemistry

Semester 1 | Period 3 | Week 17

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Subject: Chemistry

Semester: 1

Period: 3

Week: 17

School Name:
Teacher’s Name:
Subject: Chemistry
Grade Level: Grade 12
Week & Period: Week 17, Period III
Date:

Topic II: Chemistry of Selected Metals and Their Compounds
Subtopics:

  • Properties and uses of sodium and its compounds
  • Properties and uses of calcium and its compounds
  • Reactivity of iron and aluminum with air, water, and acid
  • Properties and uses of copper and its compounds

Learning Objectives:
By the end of this lesson, learners should be able to:

  1. Identify key chemical properties of sodium, calcium, copper, and their selected compounds.
  2. Discuss the reactivity trends of iron and aluminum with common reagents.
  3. Analyze practical applications of the metals in daily life and industry.

Previous Knowledge:
Learners have been introduced to the periodic table and general characteristics of metals.

Instructional Materials:

  • Metal samples or models (sodium under oil, calcium granules, copper wire)
  • Charts of metal reactions with air/water/acid
  • Reaction videos
  • Sample compounds: NaCl, CaCO₃, CuSO₄

Anticipation (Warm-Up) – 5 minutes:
Ask: “Why do we use copper wires for electricity, but not sodium or calcium?”

Building Knowledge (Main Lesson) – 25 minutes:

  1. Sodium and its compounds:
    • Na is soft, reactive with water, stored in oil
    • Compounds: NaCl (table salt), NaOH (cleaning agents), Na₂CO₃ (used in glass making), NaHCO₃ (baking soda)
  2. Calcium and its compounds:
    • Ca is less reactive than Na, used in cement and bones
    • CaCO₃ (limestone), CaSO₄ (plaster of Paris), Ca(OH)₂ (slaked lime)
  3. Iron and aluminum:
    • Iron reacts with water/oxygen = rust (Fe₂O₃); reacts with acids to release hydrogen
    • Aluminum resists corrosion due to protective oxide layer
  4. Copper and its compounds:
    • Cu is less reactive; used in wiring and coins
    • Compounds: CuSO₄ (blue crystals used in agriculture), CuO (black oxide), CuCl₂ (green solution)

Learners’ Activities:

  • Match metals to their correct compound uses
  • Predict how each metal would behave when placed in water or acid
  • Group discussion: “Which metal is most useful in your home, and why?”

Consolidation (Review and Assessment) – 10 minutes:

  • Quick quiz: name 2 compounds each of sodium and copper
  • Ask learners to describe one experiment that shows metal reactivity

Homework / Assignment:

  • Create a table comparing sodium, calcium, aluminum, iron, and copper in terms of reactivity, major uses, and safety considerations.

Notes – Detailed and Explained:

  • Sodium is highly reactive and never found freely in nature. It is essential in our bodies (as ions) and widely used in industrial cleaning and food preservation.
  • Calcium is crucial for bones, construction, and agriculture.
  • Iron rusts when exposed to air and moisture; coatings like paint or galvanizing prevent this.
  • Aluminum is lightweight and corrosion-resistant, perfect for window frames and packaging.
  • Copper is ductile, a great conductor, and used in electricity and plumbing.
  • Compounds of metals often have wide applications, e.g., copper sulfate in pesticides and sodium carbonate in detergents.

Expanded Notes / Instructions:

  • Emphasize safety handling of reactive metals like sodium
  • Discuss how each metal supports Liberia’s industries (e.g., iron in construction, copper in wiring)

Inclusive / Differentiation:

  • Use realia for tactile learners
  • Visual aids for ESL learners or those who struggle with scientific vocabulary

Teacher’s Reflection (Post-Lesson Questions):

  • Did learners understand the link between a metal’s properties and its uses?
  • Were they able to apply reactivity knowledge to predict reactions?