NCERT Solutions Class 7 Science Chapter 6 Physical and Chemical Changes – Here are all the NCERT solutions for Class 7 Science Chapter 6. This solution contains questions, answers, images, explanations of the complete chapter 6 titled Physical and Chemical Changes From of Science taught in class 7. If you are a student of class 7 who is using NCERT Textbook to study Science, then you must come across chapter 6 Physical and Chemical Changes. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes in one place.
NCERT Solutions Class 7 Science Chapter 6 Physical and Chemical Changes
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For a better understanding of this chapter, you should also see summary of Chapter 6 Physical and Chemical Changes , Science, Class 7.
| Class | 7 |
| Subject | Science |
| Book | Science |
| Chapter Number | 6 |
| Chapter Name |
Physical and Chemical Changes |
NCERT Solutions Class 7 Science chapter 6 Physical and Chemical Changes
Class 7, Science chapter 6, Physical and Chemical Changes solutions are given below in PDF format. You can view them online or download PDF file for future use.
Physical and Chemical Changes
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Question & Answer
Q.1: Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f) Digestion of food
Ans : (a) Photosynthesis- Chemical change (b) Dissolving sugar in water -Physical change (c) Burning of coal -Chemical change (d) Melting of wax -Physical change (e) Beating aluminium to make aluminium foil -Physical change (f) Digestion of food Chemical change -Physical change
Q.2: State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
(a) Cutting a log of wood into pieces is a chemical change. (True/False)
(b) Formation of manure from leaves is a physical change. (True/ False)
(c) Iron pipes coated with zinc do not get rusted easily. (True/False)
(d) Iron and rust are the same substances. (True/False)
(e) Condensation of steam is not a chemical change. (True/False)
Ans : (a) False Cutting a log of wood into pieces is a physical change. (b) False Formation of manure from leaves is a chemical change. (c) True (d) False Iron and rust are different substances. Rust is iron oxide \( \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }\) (e) True
Q.3: Fill in the blanks in the following statements:
(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.
(b) The chemical name of baking soda is _________.
(c) Two methods by which rusting of iron can be prevented are _________ and _________.
(d) Changes in which only _________ properties of a substance change are called physical changes.
(e) Changes in which new substances are formed are called _________ changes.
Ans : When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate (\(\mathrm{CaCO}_{3}\)) . (b) The chemical name of baking soda is sodium hydrogen carbonate. (c) Two methods by which rusting of iron can be prevented are galvanization and painting. (d) Changes in which only physical properties of a substance change are called physical changes. (e) Changes in which new substances are formed are called chemical changes.
Q.4: When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Ans : When baking soda (Sodium hydrogen carbonate) is mixed with lemon juice (citric acid), bubbles are formed. The bubbles are formed due to the evolution of carbon dioxide gas. This is a chemical change. In this change, citric acid contained in lemon juice reacts with sodium hydrogen carbonate which results in the evolution of carbon dioxide gas. Lemon juice + Baking soda \(\rightarrow \)Carbon dioxide + Other substances Citric acid Sodium Hydrogen carbonate
Q.5: 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.
Ans : When a candle burns, both physical and chemical changes take place. Physical change \(\rightarrow \)Melting of wax Chemical change \(\rightarrow \)Burning of wax Eating of food is another example where both physical and chemical changes occur simultaneously. Physical change \(\rightarrow \)Breaking down of larger food particles into smaller particles Chemical change \(\rightarrow \)Digestion of food
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