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Tamil Nadu (TNBSE)Class 4 Science★ 5-6 marks in TN Class 4 Term 1 exams — classification of states/properties, change of state processes, and material property identification

Matter and Materials

Samacheer Kalvi (TN State Board) Class 4 Science — Chapter 2, Matter and Materials. Properties, solubility and uses of materials. Study notes, key concepts, worked examples, practice questions and quick revision for exam preparation.

⏱ 12 min readMedium difficulty✓ Free · NCERT-aligned

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By the end of this chapter you'll be able to…

1Describe the 3 states of matter with particle arrangement: solids (tightly packed, fixed shape), liquids (close but movable, takes container shape), gases (far apart, fills any space)
2Name and explain 4 change-of-state processes: melting (solid→liquid), freezing (liquid→solid), evaporation (liquid→gas), condensation (gas→liquid)
3Understand that change of state is a reversible physical change — the substance remains the same
4Classify materials by properties: transparent/translucent/opaque, conductor/insulator (heat and electricity), magnetic/non-magnetic, soluble/insoluble in water
5Give 2 examples of each property from daily life
6Differentiate between natural materials (wood, cotton, rubber, leather) and synthetic/man-made materials (plastic, nylon, polyester, glass)

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Why this chapter matters

Matter and Materials in Class 4 deepens the states of matter knowledge from Class 3 and adds a crucial new layer: material properties. Children learn WHY glass is used for windows (transparent), WHY metals are used for utensils (conduct heat), WHY plastic coating is on electrical wires (insulator), and WHY some things float while others sink (density introduced simply). They also learn the scientific names for changes of state — melting, freezing, evaporation, condensation — and that these are reversible physical changes. This chapter bridges physics, chemistry, and everyday material science.

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Matter and Materials — Class 4 Science (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 4 Science, Chapter 2. Properties, solubility and uses of materials.

1. About this chapter

This chapter covers Matter and Materials as part of the Class 4 Samacheer Kalvi Science curriculum. It deals with properties, solubility and uses of materials and builds conceptual understanding essential for the TN School Term Exam.

By the end of this chapter, students will be able to:

Classify materials by properties
Explain solubility and basic conductivity

2. Key concepts

Concept 1: Classify materials by properties.
Concept 2: Explain solubility and basic conductivity.

3. Important terms and formulas

Term / Formula	Description
Classify materials by properties…	Classify materials by properties
Explain solubility and basic…	Explain solubility and basic conductivity

4. Worked examples

Example 1. Applying a key concept from this chapter.

Solution: Identify the relevant principle → apply the formula or rule → state the answer with correct units.

Example 2. A typical exam-style question on matter and materials.

Solution: Break the problem into steps, use the appropriate formula and verify the answer.

5. Common mistakes

Mistake: Skipping units or forgetting to state them. Fix: Always write units alongside every quantity and answer.
Mistake: Confusing similar terms or concepts in this chapter. Fix: Make a comparison table of the terms during revision.

6. Practice (exam-style)

Define the main term or principle covered in Chapter 2.
Give two real-life examples related to matter and materials.
Solve a short numerical or descriptive question from this chapter.
State one important formula and explain each symbol.

7. Answer key (hints)

Refer to section 2 (Key concepts) above for the definition.
Examples should be drawn from daily experience and local context.
Apply the formula from section 3, show all steps clearly.
Formula with units — refer to the textbook glossary for symbol meanings.

8. Quick revision

Class 4 Science — Chapter 2: Matter and Materials.
Core idea: Properties, solubility and uses of materials.
Key outcomes: Classify materials by properties; Explain solubility and basic conductivity.
Always revise diagrams / tables from the Samacheer Kalvi textbook before the exam.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

Change of state — the 4 processes

Melting → solid to liquid (ice → water at 0°C). Freezing → liquid to solid (water → ice at 0°C). Evaporation → liquid to gas (water → water vapour, at any temperature, faster when hot). Condensation → gas to liquid (water vapour → water droplets, e.g., on a cold glass surface).

Evaporation and boiling are different: evaporation happens at the surface at any temperature (puddle drying in sun); boiling happens throughout the liquid at a specific temperature (100°C for water at sea level).

Material properties — Transparency

Transparent → light passes through completely, you can see clearly through it. Examples: glass, clear plastic, clean water. Translucent → some light passes through, but you cannot see clearly. Examples: frosted glass, butter paper, thin cloth. Opaque → no light passes through, you cannot see through at all. Examples: wood, metal, stone, cardboard.

A bathroom window is often made of frosted (translucent) glass — it lets light in but people outside cannot see through, giving privacy.

Material properties — Conductors and Insulators

Conductors → materials that allow heat or electricity to pass through easily. Heat conductors: metals (iron, copper, aluminium — used for utensils). Electrical conductors: copper, aluminium, gold, silver (used for wires). Insulators → materials that do NOT allow heat or electricity to pass. Heat insulators: wood, plastic, cloth, rubber (pot handles, thermos flask). Electrical insulators: plastic, rubber, glass (wire coating, plug casings).

This is a critical safety concept: electrical wires have a copper core (conductor inside) and plastic coating (insulator outside). The copper carries the current; the plastic protects you from getting shocked.

Soluble vs Insoluble

Soluble → dissolves in water, forms a clear solution. Examples: salt, sugar, washing powder, lemon juice. Insoluble → does not dissolve in water, may float or settle. Examples: sand, chalk powder, oil, plastic, metal.

When salt dissolves in water, it seems to 'disappear' but it is still there. If you taste the water, it is salty. If you evaporate all the water (leave it in the sun), the salt crystals will come back.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Calling all clear liquids 'water'

✓ Many clear liquids look like water but are not: vinegar, alcohol, glycerine, and even some acids are colourless and transparent. Never drink an unknown clear liquid — it could be dangerous.

WATCH OUT

✗ Thinking evaporation only happens when water boils

✓ Evaporation happens at ALL temperatures — even cold water evaporates, just slowly. Clothes dry on a clothesline even on a cold day, and puddles disappear even without boiling. The rate increases with heat, wind, and surface area.

WATCH OUT

✗ Confusing melting (solid→liquid) with dissolving (solid disperses in liquid)

✓ Melting = heating a solid until it becomes liquid (ice → water, wax → liquid wax). The substance changes state, not composition. Dissolving = a solid breaks into invisible particles and mixes with a liquid (salt in water). The liquid is still there — it is now a solution.

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