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Learn Physical and chemical changes
In the CBSE Class 9 Science chapter "Is Matter Around Us Pure," one of the most fundamental concepts you will learn is the distinction between physical and chemical changes. Everything around us is constantly changing, from ice melting in a glass of water to iron rusting in the rain. To understand matter, scientists categorize these changes based on whether the actual "identity" of the substance is altered. A Physical Change is a superficial change where the state, shape, or appearance of the matter is modified, but its internal composition remains exactly the same. In contrast, a Chemical Change is a permanent transformation where the original matter converts into an entirely new substance with completely different chemical properties.
The core logic behind identifying these changes lies in examining what happens at the molecular level. During a Physical Change, the chemical formula of the substance doesn't change; for instance, solid H₂O (ice) simply absorbs energy to become liquid H₂O (water). Because no molecular bonds are permanently broken to form new compounds, physical changes are easily reversible. On the other hand, a Chemical Change involves a chemical reaction. The molecular bonds of the original substances (reactants) break, and new bonds form to create new substances (products). For example, when carbon (C) in wood burns with oxygen (O₂), it yields carbon dioxide (CO₂) and ash. Chemical changes are usually irreversible and are often accompanied by clear indicators like the release of heat, emission of light, production of a gas, or a permanent change in color.
The visual diagram above perfectly contrasts these two types of changes side-by-side to help you visualize the difference. On the left, we see a classic physical change: ice melting into water. Notice how the internal identity of the substance, water (H₂O), remains the exact same throughout the process. Because of this, it is easily reversible by simply freezing the liquid water again. On the right, the diagram illustrates a chemical change: burning wood. As the solid wood reacts with oxygen in the air, it produces heat, fire, carbon dioxide gas, and ash. Because entirely new substances are formed with new chemical formulas, you cannot turn the ash and smoke back into a solid log of wood! In your school exams, you will frequently be asked to classify everyday scenarios—like dissolving sugar in water, digesting food, or rusting iron—into these two categories based precisely on whether a new chemical substance is formed.
Grasping the difference between physical and chemical changes builds a critical foundation for all future chemistry topics in high school. If you find yourself struggling to classify different scientific reactions, or if you need help understanding other complex concepts in "Is Matter Around Us Pure," specialized guidance can make a world of difference. Explore UrbanPro to connect with experienced, highly-verified CBSE Class 9 Science tutors. Whether you prefer interactive online sessions or in-person local tuition, UrbanPro is the best platform to find expert educators who can simplify science, patiently answer your doubts, and help you score top marks in your final exams.
Other Concepts in Is Matter Around Us Pure
- Mixtures and their types (homogeneous, heterogeneous)
- Solutions: solute, solvent, concentration
- Elements and compounds
- Suspensions and colloids – properties and differences
Other Concept Videos for Physical and chemical changes
Change Matters: Physical vs. Chemical
CBSE - Class 9>Science>Is Matter Around Us Pure>Physical and chemical changes
Top Tutors who teach Physical and chemical changes
Super Tutor 
Lalpur, Ranchi 
14 students 
2214 hrs of classes completed 
500 per hour 
Online Classes I am a qualified and dedicated teacher, having 10 years of teaching and research experience across different boards including CBSE, ICSE, IGCSE, IB, GCSE, and Australian Board. I specialize in guiding students from Class 8 to Post Graduation, helping them achieve academic excellence with a tailored and engaging teaching approach. I bring in-depth knowledge and expertise to my sessions. Qualifications: • Ph. D (Science) – BIT Mesra, Ranchi • CSIR UGC NET (2011) AIR-14 • ICAR NET (2010) • ICAR NET (2018) • GATE (2009) My student-centered approach focuses on assessing individual learning needs, bridging knowledge gaps, and fostering critical thinking through interactive methods like discussions, visual aids, and hands-on activities. Regular feedback and personalized guidance empower students to excel and develop a lifelong love for learning.
I have been taking classes from Gulsaz Ma'am since last one year for Physics, Chemistry and Biology for grade 9 (IGCSE). She is an exceptional teacher who has made a significant impact on my understanding of complex concepts. My marks have significantly improved as well. Her patience, clarity, and dedication have helped me grasp difficult topics with ease. The way she breaks down complex problems into manageable parts is truly impressive. Highly recommended for anyone struggling with science!
Super Tutor Sector 92, Gurgaon 20 students 1281 hrs of classes completed 800 per hour Online Classes 
Student's Home 
Tutor's home Teaching since last 20 years
Amit ji is a fantastic teacher. My daughter is very happy with her studies. He is exactly what she needed, a teacher with deep understanding of his subject and a very good communicator. If there is one gripe that I may mention, it's time. We would love to have more classes to cover Physics, but he is completely booked for his time. I would highly recommend him. Thank you.
Super Tutor Itagalpura Main Rd, Madappanahalli 43 students 3517 hrs of classes completed 400 per hour Online Classes I gained extensive experience in delivering high-quality education following the CBSE/ICSE curriculum. My key responsibilities included: Classroom Teaching: Effectively taught Mathematics, Physics and Chemistry to students of classes IX, ensuring alignment with the CBSE/ ICSE syllabus and fostering a deep understanding of key concepts. Curriculum Planning: Designed and implemented lesson plans that adhered to the CBSE guidelines, ensuring comprehensive coverage of topics while keeping in mind the varying learning needs of students. Student Assessment: Created and administered tests, quizzes, and assignments in accordance with the CBSE exam pattern. Monitored student performance and provided constructive feedback to facilitate continuous improvement. Interactive Learning: Encouraged an interactive classroom environment, integrating various teaching aids such as multimedia presentations, hands-on activities, and group discussions to enhance student engagement and understanding. Preparation for Board Exams: Provided focused support for students appearing for their CBSE/ICSE board exams by conducting regular revision sessions, mock tests, and personalized guidance to help them excel. Parental Communication: Maintained regular communication with parents regarding student progress, attendance, and overall development. Organized parent-teacher meetings to ensure a collaborative approach to student growth. Co-curricular Involvement: Actively participated in school events, projects, and extracurricular activities, fostering holistic development among students. Professional Development: Engaged in continuous professional development through workshops and CBSE training programs to stay updated with the latest educational practices and policies.
Super Tutor Sector 5, Dwarka, Delhi 33 students 1162 hrs of classes completed 500 per hour Online Classes I teach Math and Science to 8th-12th standard students and have been teaching for more than 10 years. Batch of 2 Students: I conduct these small batches with a pair of students of the same class and the education board (I cover all popular boards CBSE, ICSE, IGCSE etc.). Works for those students/parents who are looking for individual attention for their kids but still want it to be a little affordable. *3 classes per week (So 12 a month) *Maths and Science (Also English Grammar and Literature) *Fee Rs. 4500/- per month/12 classes. Batch of 6 Students: I conduct these small batches with 5-6 students of the same class and the education board (I cover all popular boards CBSE, ICSE, IGCSE etc.). *4 classes per week (So 16 a month) *Maths and Science *Fee Rs. 4000/- per month/16 classes. I will start the classes immediately once the first kid enrolls. ------------------------------------------------------------------------------- Individual/Private/One-to-One classes: I conduct these one to one classes for those students willing to have one to one setup (I cover all popular boards CBSE, ICSE, IGCSE etc.). *3 classes per week (So 12 a month) *Maths and Science (Also English Grammar and Literature) *Fee Rs. 7000/- per month/12 classes. ------------------------------------------------------------------------------- I took classes and batches in different institutions.
The teacher is very good. He understands the students strength and weakness and decides the pace of learning. He also tries to make the student comfortable and at ease with his/her capacity and then works on the child. It is not just Math he works on but the child's confidence and comfort with the subject. Highly recommended.
Super Tutor Rohini Sector-24, Delhi 10 students 1404 hrs of classes completed 450 per hour Online Classes I am a teacher and I have been teaching for the past 20 years. l am presently teaching in a school. l have done MSc in Maths and have taught many students.
Thanks Ma'am for supporting Anvi in the subject. She has been getting more comfortable and relaxed with the theory and concepts in mathematics. Her fear is waning away and she shows an increased interest in the subject. I will definitely recommend you to all prospective parents. Thanks again!
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FAQ
What is the meaning of Physical and chemical changes?
It is a fundamental principle in Is Matter Around Us Pure that explains the nature and characteristics of Physical and chemical changes.
Why is Physical and chemical changes important for CBSE - Class 9 exams?
This concept is crucial for the exams as questions related to Is Matter Around Us Pure and specifically Physical and chemical changes are very common. It helps secure marks in the section effectively.
Is Physical and chemical changes part of the latest NCERT syllabus?
Yes, Physical and chemical changes is an integral part of the CBSE - Class 9 NCERT Science syllabus. It is a key topic covered in the Is Matter Around Us Pure chapter.
What are common mistakes students make with Physical and chemical changes?
Students often miss the minute details or fundamental definitions of Physical and chemical changes. Regular revision and practice are needed to master the nuances.
How should I approach learning Physical and chemical changes?
Read the NCERT text thoroughly to grasp the theory. Create summary notes and flowcharts to retain the key points of Physical and chemical changes.
How can UrbanPro help me understand Physical and chemical changes better?
UrbanPro connects you with experienced Science tutors who can explain Physical and chemical changes with simple examples. You also get access to doubt-clearing sessions and mock tests for better preparation.
