Last Updated on October 22, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 7 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 7 science. In this article, you will find case study questions for cbse class 7 science chapter 5 Physical and Chemical Changes.
| Chapter | Physical and Chemical Changes |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 7 |
| Subject | Science |
| Useful for | Class 7 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 7 Science Chapterwise Case Study |
Case Study Questions on Physical and Chemical Changes
Questions
Seema wants to bake vanilla cake. She followed the instructions as per the recipe. She made a batter with flour, butter, powdered sugar, milk and vanilla essence. She then added 1 tsp of baking powder to the batter and mixed them together. In a separate bowl, she took 1/2 tsp baking soda and mixed 1/2 tsp vinegar to it, the pair “foamed up”. She poured that into the batter and mixed well. She noticed bubbles in the batter and the batter looked fluffy.
Q. 1. Baking soda and vinegar are chemically called _________respectively.
(a) sodium carbonate and acetic acid
(b) sodium hydrogen carbonate and acetic acid
(c) sodium hydroxide and oxalic acid
(d) sodium hydrogen carbonate and oxalic acid
Difficulty Level: Medium
Ans. Option (b) is correct
Explanation: Baking soda and vinegar are chemically sodium hydrogen carbonate and acetic acid respectively.
Q. 2. When vinegar and baking soda were mixed together, the pair “foams up” because:
(a) nitrogen gas was produced
(b) oxygen gas was produced
(c) carbon dioxide gas was produced
(d) ammonia gas was produced
Difficulty Level: Medium
Ans. Option (c) is correct.
Explanation: Carbon dioxide evolved due to the chemical reaction between acetic acid and sodium hydrogen carbonate.
Vinegar (Acetic acid) + Baking soda (Sodium hydrogen carbonate) –> Carbon dioxide + other substances
Q. 3. Baking a cake is a:
(a) Physical change
(b) Chemical change
(c) Reversible change
(d) Both (a) and (b)
Difficulty Level: Easy
Ans. Option (b) is correct.
Explanation: Baking a cake is a chemical change because the chemical composition of cake is different from that of batter, heat energy is used in baking and it is irreversible because we cannot get back the original batter.
Q. 4. What two things would happen if the gas produced in the above case is passed through lime water?
Difficulty Level: Medium
Ans. When carbon dioxide is passed through lime water, calcium carbonate is formed, and the lime water turns milky.
Q. 5. Write chemical equation of:
(a) Reaction between baking soda and vinegar.
(b) Reaction when the emitted gas is passed through lime water.
Difficulty Level: Difficult
Ans. (a) Vinegar (Acetic acid) + Baking soda (Sodium hydrogen carbonate) –> Carbon dioxide + other substances
(b) Carbon dioxide (CO2) + Lime water [Ca (OH)2] –> Calcium Carbonate (CaCO3) + Water (H2O)
Also check
- Electric Currents and Its Effects Class 7 Case Study Questions Science Chapter 10
- Motion and Time Class 7 Case Study Questions Science Chapter 9
- Reproduction in Plants Class 7 Case Study Questions Science Chapter 8
- Transpirations in Animals and Plants Class 7 Case Study Questions Science Chapter 7
- Respiration in Organisms Class 7 Case Study Questions Science Chapter 6
- Physical and Chemical Changes Class 7 Case Study Questions Science Chapter 5
- Acids Bases and Salts Class 7 Case Study Questions Science Chapter 4
- Heat Class 7 Case Study Questions Science Chapter 3
- Nutrition in Animals Class 7 Case Study Questions Science Chapter 2
- Nutrition in Plants Class 7 Case Study Questions Science Chapter 1
Topics from which case study questions may be asked
- Define physical and chemical changes.
- Give examples of physical and chemical changes.
- Describe physical and chemical properties of substances.
- Define chemical reactions.
- Discuss changes observed during a chemical reaction.
- Explain process of rusting.
- List the ways to prevent process of rusting.
- Describe the process of crystallisation.
- Write chemical equations for various chemical reactions.
In our daily life we come across many changes in our surroundings. For example, dissolving sugar in water, tearing of paper, boiling of water, boiling of egg, burning of wax, curdling of milk, stretching rubber band, etc.
These changes can be classified as physical and chemical changes.
For further practice on case study questions related to Class 7 Science Chapter 5 Physical and Chemical Changes, we recommend exploring the link given below.
Frequently Asked Questions (FAQs) on Physical and Chemical Changes Case Study Questions
Q1: What are case study questions for CBSE examinations?
A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.
Q2: Why are case study questions important for understanding class 7 science chapters?
A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.
Q3: How should students approach answering case study questions for CBSE?
A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of plant nutrition, and formulate well-supported solutions or responses.
Q4: Are there any resources available online for students to practice case study questions on class 7 science chapters for CBSE exams?
A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience.
Q5: How can students effectively prepare for case study questions on Physical and Chemical Changes for CBSE exams?
A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.
Q6: How can teachers incorporate case study questions on Physical and Chemical Changes class 7 science into classroom teaching?
A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of physical and chemical changes.
Q7: What are the important keywords from the chapter “Physical and Chemical Changes”?
A7: Important keywords from the chapter “Physical and Chemical Changes” are given below”
Shredding: The action of tearing something.
Sublimation: Conversion of a substance from a solid to a gaseous state.
Dry ice: Solid carbon dioxide.
Irreversible: Cannot be undone or reversed.
Reversible: Can be redone or reversed.
Chemical reaction: Process of conversion of one or more substances into one or more new substances.
Chemical equation: Symbolic representation of a chemical reaction.
Lime water: A saturated solution of calcium hydroxide in water.
