Chemical Properties of Metals and Non-metals

Active learning lets students directly observe how metals and non-metals behave differently with oxygen, water, acids, and bases. When students handle materials themselves, they build lasting memory traces of reactivity patterns that lectures alone cannot match.

• Class 8
• Science
• 4 activities
• 20 min–40 min

Learning Objectives

1. Compare the products formed when common metals (e.g., magnesium, iron) and non-metals (e.g., sulphur, carbon) react with oxygen, identifying whether the resulting oxides are acidic or basic.
2. Explain the reactions of reactive metals (e.g., sodium, potassium) with water, classifying the products and the energy released.
3. Analyze the displacement reactions between metals using a reactivity series, predicting which metal will displace another from its salt solution.
4. Classify oxides of metals and non-metals as acidic or basic based on their reaction with water or litmus paper.
5. Demonstrate the difference in reactivity of metals and non-metals with dilute acids through microscale experiments, identifying gas evolution or lack thereof.

Stations Rotation

⏱ 40 min·Small Groups

Stations Rotation: Metal Reactivity with Acids

Prepare stations with magnesium, zinc, iron, and copper strips in dilute HCl test tubes. Students observe fizzing, test gas with a burning splint, and note reactivity order. Groups rotate every 10 minutes and compile a class reactivity series chart.

Prepare & details

Explain the difference in reactivity of metals and non-metals with oxygen.

Facilitation Tip: Set up three acid stations with magnesium, zinc, and copper strips in 1M hydrochloric acid, ensuring students rotate clockwise to avoid crowding.

Setup: Designate four to six fixed zones within the existing classroom layout — no furniture rearrangement required. Assign groups to zones using a rotation chart displayed on the blackboard. Each zone should have a laminated instruction card and all required materials pre-positioned before the period begins.

Materials: Laminated station instruction cards with must-do task and extension activity, NCERT-aligned task sheets or printed board-format practice questions, Visual rotation chart for the blackboard showing group assignments and timing, Individual exit ticket slips linked to the chapter objective

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

Experiential Learning

⏱ 25 min·Pairs

Displacement Reaction Pairs: Zinc and Copper Sulphate

Pairs add zinc granules to blue copper sulphate solution, observe colour change to colourless, and filter to see reddish-brown copper deposit. They write a balanced equation and predict outcomes with iron instead. Discuss using reactivity series posters.

Prepare & details

Compare the products formed when metals and non-metals react with acids.

Facilitation Tip: Before the zinc-copper sulphate test, ask students to predict and record the colour change they expect in the solution.

Setup: Flexible classroom arrangement with desks pushed aside for activity space, or standard rows with group-work stations rotated in sequence. Works in standard Indian classrooms of 40–48 students with basic furniture and no specialist equipment.

Materials: Chart paper and sketch pens for group recording, Everyday household or locally available objects relevant to the concept, Printed reflection prompt cards (one set per group), NCERT textbook for connecting activity outcomes to chapter content, Student notebook for individual reflection journalling

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Experiential Learning

⏱ 30 min·Whole Class

Oxygen Reaction Comparison: Whole Class Demo

Teacher demonstrates burning magnesium ribbon for white ash and heating charcoal powder for pungent gas. Students predict and record oxide properties using litmus paper. Class discusses acidic vs basic nature and links to pollution from sulphur dioxide.

Prepare & details

Predict the outcome of a displacement reaction between a more reactive and less reactive metal.

Facilitation Tip: Keep magnesium ribbon ready for the whole-class demo so every student sees the bright white flame and white ash forming.

Setup: Flexible classroom arrangement with desks pushed aside for activity space, or standard rows with group-work stations rotated in sequence. Works in standard Indian classrooms of 40–48 students with basic furniture and no specialist equipment.

Materials: Chart paper and sketch pens for group recording, Everyday household or locally available objects relevant to the concept, Printed reflection prompt cards (one set per group), NCERT textbook for connecting activity outcomes to chapter content, Student notebook for individual reflection journalling

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Experiential Learning

⏱ 20 min·Individual

Non-metal Tests: Individual Observation Logs

Provide sulphur powder to heat gently and test product gas with limewater. Students log observations, compare with metal oxide tests from prior stations, and note differences in reactivity with water using litmus.

Prepare & details

Explain the difference in reactivity of metals and non-metals with oxygen.

Facilitation Tip: Provide red and blue litmus strips at each station so students can test oxide solutions immediately after reactions.

Setup: Flexible classroom arrangement with desks pushed aside for activity space, or standard rows with group-work stations rotated in sequence. Works in standard Indian classrooms of 40–48 students with basic furniture and no specialist equipment.

Materials: Chart paper and sketch pens for group recording, Everyday household or locally available objects relevant to the concept, Printed reflection prompt cards (one set per group), NCERT textbook for connecting activity outcomes to chapter content, Student notebook for individual reflection journalling

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Teaching This Topic

Start with a quick sorting task where students separate given elements into metals and non-metals, then discuss why some items like carbon or silicon are tricky. Use the reactivity series as a living document on the board, updating it after each displacement or acid test. Avoid rushing through demos; let students articulate observations before you label the products.

What to Expect

Students will confidently distinguish metal and non-metal reactivity through observation, prediction, and explanation. They will correctly place metals in a reactivity series and justify oxide classifications using litmus tests and displacement reactions.

Watch Out for These Misconceptions

Common Misconception

During Station Rotation: Metal Reactivity with Acids, watch for students assuming all metal-acid reactions produce the same gas or same vigour.

What to Teach Instead

Have students collect gas in inverted test tubes and bring a burning splint to the mouth; magnesium squeaks loudly, zinc produces a gentle pop, while copper shows no reaction at all, forcing students to adjust their initial idea.

Common Misconception

During Displacement Reaction Pairs: Zinc and Copper Sulphate, watch for students expecting a reaction with all metal-non-metal combinations.

What to Teach Instead

Ask pairs to prepare two labelled cards: one with their prediction and one with the actual observation, then share with another pair to compare differences and refine their mental model.

Common Misconception

During Oxygen Reaction Comparison: Whole Class Demo, watch for students generalising that all metal oxides behave the same way.

What to Teach Instead

Hand out red and blue litmus strips for students to test solutions of magnesium oxide and sulphur dioxide immediately after the demo, then circulate to hear how they explain the colour changes.

Assessment Ideas

Quick Check

After Oxygen Reaction Comparison: Whole Class Demo, give students a list of oxides (MgO, SO2, CaO, CO2) and ask them to classify each as acidic or basic and write one sentence explaining their choice based on the parent element.

Discussion Prompt

During Displacement Reaction Pairs: Zinc and Copper Sulphate, pose the scenario: 'If you place iron nails in copper sulphate solution, what do you predict will happen? Explain your prediction using the reactivity series.' Circulate to listen for correct references to displacement and relative reactivity.

Exit Ticket

After Station Rotation: Metal Reactivity with Acids, ask students to write down one metal and one non-metal, then describe its reaction (or lack of reaction) with dilute hydrochloric acid and the expected product, if any.

Extensions & Scaffolding

• Challenge early finishers to test aluminium foil with 1M sodium hydroxide to see if it behaves like a metal or non-metal in base.
• Scaffolding for struggling pairs: provide pre-labelled test tubes with metal strips already placed in acid so they focus on gas collection and flame tests.
• Deeper exploration: invite students to research why gold and platinum do not react with most acids, then present findings to the class.

Key Vocabulary

Reactivity Series	An ordered list of elements that shows their reactivity relative to each other. More reactive elements can displace less reactive elements from their compounds.
Oxidation	A chemical reaction involving the loss of electrons or an increase in oxidation state. In this context, it often involves reaction with oxygen.
Acidic Oxide	An oxide that reacts with water to form an acid, or reacts with a base to form a salt and water. Typically formed by non-metals.
Basic Oxide	An oxide that reacts with water to form a base, or reacts with an acid to form a salt and water. Typically formed by metals.
Displacement Reaction	A reaction in which a more reactive element displaces a less reactive element from its compound. For example, a more reactive metal displacing a less reactive metal from its salt solution.