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Chapter 4: The World of Metals and Non metals Notes

Home / Class Notes / Class 7 / Science / Chapter 4: The World of Metals and Non metals
✓ Free notes Class 7 Science 1 study file

About these notes

Class 7 Science Chapter 4 The World of Metals and Non metals notes for CBSE and Bihar Board give concise definitions, property tables, labelled diagrams and sample reaction equations to speed up revision. Main sub-topics: occurrence of metals (minerals and ores), physical properties (lustre, malleability, ductility, electrical/thermal conductivity), chemical behaviour with oxygen, water and acids, reactivity series and displacement reactions, alloys and corrosion prevention. Use these notes for revision, then practise important questions, attempt MCQ and take the chapter test and mock tests on Merit Spring ROH to check understanding.

Key points you will learn

  • Class 7 Science Chapter 4 The World of Metals and Non metals — classification, physical and chemical properties, reactivity series
  • Physical properties: lustre, malleability, ductility, sonorous nature, electrical and thermal conductivity
  • Chemical reactions: metals with oxygen (oxides), with water (2Na + H2O → 2NaOH + H2), with acids producing H2
  • Displacement reactions and reactivity series illustrated by Zn + CuSO4 → ZnSO4 + Cu
  • Occurrence: minerals, ores, native metals and brief idea of extraction from ores
  • Alloys and uses: brass (Cu + Zn), bronze (Cu + Sn), steel (Fe + C) and reasons for alloying
  • Corrosion (rusting) and prevention: painting, oiling, greasing, galvanizing and alloying

What is inside this chapter

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The World of Metals and Non metals - Chapter 4 Notes (Class 7 Science)

Class 7 Science The World of Metals and Non metals - Chapter 4 handwritten-style revision notes for CBSE and Bihar Board students.

📥 Open notes

Questions students ask

What is covered in Class 7 Science Chapter 4 The World of Metals and Non metals?

This chapter explains how metals and non-metals differ, details physical properties (lustre, malleability, ductility, conductivity), chemical reactions with oxygen/water/acids, reactivity series, occurrence of ores, alloys and corrosion prevention.

How to remember properties and reactions for exams?

Make a two-column table of properties for metals and non-metals, practise key equations such as 2Na + H2O → 2NaOH + H2 and Zn + CuSO4 → ZnSO4 + Cu, learn the reactivity order and attempt chapter test and MCQ.

Where to find Class 7 Science The World of Metals and Non metals notes and important questions?

Read the chapter notes on Merit Spring ROH; for important questions and exam-style practice use the site’s chapter test and mock tests to simulate board-pattern questions and check answers.

Give one example of a displacement reaction from the chapter?

Zn + CuSO4 → ZnSO4 + Cu. This shows zinc displaces copper because zinc is higher in the reactivity series; practise writing the same in word and ionic forms.

What are common methods to prevent rusting?

Painting, oiling, greasing, galvanizing and making alloys (e.g., stainless steel) are standard methods; these prevent contact with air and water or provide sacrificial protection to metallic surfaces.

← Previous chapter Chapter 3: Electricity Circuits and Their Components

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