Chapters
Chapter 2: Nutrition in Animals
Chapter 3: Fibre to Fabric
Chapter 4: Heat
Chapter 5: Acids, Bases and Salts
Chapter 6: Physical and Chemical Changes
Chapter 7: Weather, Climate and Adaptations of Animals to Climate
Chapter 8: Wind Storms and Cyclones
Chapter 9: Soil
Chapter 10: Respiration in Organisms
Chapter 11: Transportation in Animals and Plants
Chapter 12: Reproduction in Plants
Chapter 13: Motion and Time
Chapter 14: Electric Current and Its Effects
Chapter 15: Light
Chapter 16: Water: A Precious Resource
Chapter 17: Forests: Our Lifeline
Chapter 18: Wastewater Story
Chapter 6: Physical and Chemical Changes
NCERT solutions for Class 7 Science Chapter 6 Physical and Chemical Changes [Pages 65 - 66]
Classify the changes involved in the following processes as physical or chemical changes:
Photosynthesis
Dissolving sugar in water
Burning of coal
Melting of wax
Beating aluminium to make aluminium foil
Digestion of food
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Cutting a log of wood into pieces is a chemical change. (True/False)
True
False
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Formation of manure from leaves is a physical change. (True/ False)
True
False
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Iron pipes coated with zinc do not get rusted easily. (True/False)
Ture
False
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Iron and rust are the same substances. (True/False)
True
False
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Condensation of steam is not a chemical change. (True/False)
True
False
Fill in the blanks in the following statements:
When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.
Fill in the blanks in the following statements:
The chemical name of baking soda is _________.
Fill in the blanks in the following statements:
Two methods by which rusting of iron can be prevented are _________ and ____ _
Fill in the blanks in the following statements:
Changes in which only _____ __ properties of a substance change are called physical changes.
Fill in the blanks in the following statements:
Changes in which new substances are formed are called _________changes
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
How would you show that setting of curd is a chemical change?
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Describe how crystals of copper sulphate are prepared.
Explain how painting of an iron gate prevents it from rusting.
Explain why rusting of iron objects is faster in coastal areas than in deserts.
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A) then it burns (Change − B). The following statements pertain to these changes. Choose the correct one
Process − A is a chemical change
Process − B is a chemical change.
Both processes A and B are chemical changes.
None of these processes is a chemical change
Anaerobic bacteria digest animal waste and produce biogas (Change − A).
The biogas is then burnt as fuel (Change − B). The following statements pertain to these changes. Choose the correct one.
Process − A is a chemical change.
Process − B is a chemical change.
Both processes A and B are chemical changes
None of these processes is a chemical change
Chapter 6: Physical and Chemical Changes
NCERT solutions for Class 7 Science chapter 6 - Physical and Chemical Changes
NCERT solutions for Class 7 Science chapter 6 (Physical and Chemical Changes) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Class 7 Science solutions in a manner that help students grasp basic concepts better and faster.
Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in Class 7 Science chapter 6 Physical and Chemical Changes are Concept of Physical Changes, Concept of Chemical Change, Rusting of Iron, Concept of Crystallisation.
Using NCERT Class 7 solutions Physical and Chemical Changes exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 7 prefer NCERT Textbook Solutions to score more in exam.
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