Change is continuous in our surroundings. Change involves melting ice, rusting of iron, baking a cake, etc. In NCERT Solutions Chapter 5 of Class 7 Science, Changes Around Us, students will learn about physical and chemical changes, what are the differences, what is the purpose of physical or chemical changes, and what is the real-life application of changes?
Recognizing these changes will encourage us not only in science but also in our exploration and awareness about the environment around us. With organized NCERT solutions to help encourage the development of strong conceptual clarity, students will be able to easily answer any question found in the textbook.
Download the free PDF of NCERT Solutions for Class 7 Science Chapter 5 from below:
Reversible and Irreversible Changes
Physical Changes
Examples: stretching of a rubber band, melting ice, breaking glass.
Chemical Changes
Examples: rusting of iron, curdling of milk, burning of wood, digestion of food.
Common Identifiers of a Chemical Change
Real-World Uses of Physical and Chemical Changes
Household Examples
Cooking- A chemical change because raw ingredients change into something new, edible and a substance.
Melting wax- A physical change, as people melt chic wax and create candles and molds.
Freezing water- A physical change, where water freezes or a change in state that can be seen in refrigerators or cold storage.
Industrial and Environmental Examples
Rust prevention- A chemical change that we avoid; we paint or galvanize some metals that we use to avoid changes in those metals over time.
Paper recycling- is an example of physical change that is a process involving pulping ingredients, and removing water to make shapes.
Burning gasoline in a vehicle- A chemical change as we do a process of conversion, in a truck it changes gasoline to energy and exhaust gases.
Agriculture and Health
Photosynthesis- A chemical change. It is a process that converts carbon-dioxide and water into glucose and oxygen.
Fermentation- A chemical process involving microbes to turn grape juice or grain into alcohol or acids.
Digestion- A chemical change. A series of chemical changes that break down food, to sugars, protein, etc.
Promoting the Scientific Mindset
This was the part of my chapter intended to promote the scientific mindset, trying to pose questions like:
Because of observations and participation in hands-on experiments, whether we blow up balloons from the chemical reactions, and/or whether or how soap impact changes in turmeric, students are encouraged to visualize the next step in learning, hypothesize the reasons why, conduct a series of observations of example, or what they think an example may appear or what additional resources they have.
Deep Conceptual Knowledge
The solutions turn complicated concepts such as oxidation and precipitation into easy-to-understand language, therefore ensuring a deep understanding.
Complete Coverage
All conceivable textbooks questions—In-Text Exercises, Activity-based Reasoning, and HOTs questions—are all thoroughly outlined and explained.
Transferable Thinking
Explanations contain more than just the answers—they explain the reason behind the changes, creating stronger scientific thinkers.
Real-World Relevance
Learning is facilitated and enriched by connecting real-world instances such as rustings, baking, and freezing to classrooms.
Exam-Ready Format
After working through step-by-step solutions using key terminology, students will have the confidence to answer any question type on class and exam tests.
(Session 2025 - 26)