Chemistry · 5th Year

Active learning ideas

Introduction to Chemical Reactions

Active learning helps students move beyond memorizing definitions by engaging with the abstract concepts of chemical bonding through hands-on tasks. These activities allow students to test predictions, observe patterns, and correct misunderstandings in real time, which builds deeper conceptual understanding.

• NCCA Curriculum Specifications
• NCCA: Primary - Materials - Chemical Change

• 15–50 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Inquiry Circle
• 25 min · Pairs

Inquiry Circle: Electronegativity Tug-of-War

Students use a table of electronegativity values to play a 'tug-of-war' game. They calculate the difference between two atoms; if the difference is high, it's an ionic 'win' (transfer), and if it's low, they must negotiate a 'shared' covalent bond.

What happens when we mix baking soda and vinegar?

Facilitation Tip

During the Electronegativity Tug-of-War, assign roles clearly so all students participate in calculating differences and predicting bond types.

What to look for

Provide students with three scenarios: 1) Water boiling, 2) A candle burning, 3) Iron rusting. Ask them to write 'P' for physical change or 'C' for chemical change next to each, and briefly explain their reasoning for one of them.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Stations Rotation
• 50 min · Small Groups

Stations Rotation: Properties Lab

Set up stations with samples of salt, sugar, wax, and copper. Students test solubility, conductivity (solid vs. aqueous), and melting points, then work in groups to work backwards and identify the bonding type based on their observations.

How can we tell if something new has been made?

Facilitation Tip

Set up the Properties Lab with labeled stations and timed rotations to keep students focused on comparing ionic and covalent compounds.

What to look for

During a demonstration of baking soda and vinegar, ask students: 'What evidence do you see that a chemical change is happening?' and 'What are the reactants and what do you predict the products might be?' Record student responses on the board.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 03

• Think-Pair-Share
• 15 min · Pairs

Think-Pair-Share: The Octet Rule Exceptions

Provide examples like BF3 or SF6 that don't follow the octet rule. Students think about why these might exist, then pair up to discuss how the 'rules' of chemistry are often models that have specific limits.

Are all changes chemical changes?

Facilitation Tip

In the Think-Pair-Share on octet rule exceptions, circulate and listen for misconceptions like expanded octets in sulfur or phosphorus before guiding the discussion.

What to look for

Pose the question: 'Are all changes that produce gas chemical changes?' Facilitate a brief class discussion, encouraging students to recall examples and justify their answers based on whether a new substance was formed.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

A few notes on teaching this unit

Experienced teachers approach this topic by using analogies carefully, avoiding oversimplifications that create misconceptions later. Focus on helping students connect the abstract ideas of electronegativity and electron distribution to observable properties like solubility and melting points. Use formative assessment throughout to address gaps before they become ingrained.

By the end of these activities, students should be able to predict bond type using electronegativity, explain the difference between ionic lattices and covalent molecules, and identify evidence of chemical change. Successful learning is evident when students justify their reasoning with both data and models.

---

Watch Out for These Misconceptions

• During the Collaborative Investigation: Electronegativity Tug-of-War, watch for students interpreting ionic bonds as simple attractions between two atoms rather than a repeating lattice.

  Use the 3D crystal lattice models or stack oranges to show the repeating structure, and ask students to describe how the tug-of-war analogy changes when scaled up to many ions.

• During the Station Rotation: Properties Lab, watch for students assuming all covalent compounds are gases or liquids at room temperature.

  Provide solid examples like sugar or wax, and ask students to relate their observations to the strength of intermolecular forces rather than bond type alone.

---

Methods used in this brief

• Inquiry Circle
• Stations Rotation
• Think-Pair-Share