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Science
Class 7

CBSE · Class 7 · Science

Changes Around Us: Physical and Chemical

Chapter 5CuriosityNCERT · Classes I–VIII · current textbook editions

2 worlds · 3 labs · 2 stories for this chapter.

Topics

Types of change
- Physical changes
- Chemical changes and new substances
- Rusting
- Combustion
- Physical and chemical changes in one process
Changes over time
- Reversibility and permanence
- Useful and unwanted changes
- Weathering and erosion

Learning objectives

Explain whether an observed change provides evidence of a new substance.

Worlds

Places to explore freely · 2 worlds

WorldThe Science of CookingRun a real stove: bring water to the boil and read the plateau, seal a cooker for dal, take the egg out before the yolk sets, brown paneer without burning it, split milk with lemon, keep the vitamin in the spinach, rise a dough, beat the danger zone, pour caramel in its window, and build a thali that meets a thirteen-year-old's needs
WorldThe Rock Cycle & SoilOne hand specimen dragged around the rock cycle — weathered, rounded, buried, cooked, melted and cooled at real rates; weigh it, scratch it, fizz it, and shake the soil jar

Main labs

Built for this chapter · 2 labs

Main labChanges Around UsChemistry
Main labCombustion & FlameChemistry

More labs

Also fit this chapter · 1 lab

LabSoil and Its TypesEarth & Space

Stories

Read it as a story · 2 stories

StoryFood MaterialsChemistry
StoryChem Changes WeatherChemistry

Practice

Questions for Class 7 Science, with worked answers, on screen or as a printed paper.

Open the question bank

Previous chapterThe World of Metals and Non-metals Next chapterAdolescence: A Stage of Growth and Change