Best Study Material for Class 9 Exam
Class 9 Exam > Class 9 Notes > Science Class 9 > Case Based Question Answer: Is Matter Around Us Pure?
Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??
(I) Read the given passage and answer the questions that follow based on the passage and related studied concepts.
A pure substance consist of single type of particles. Mixture consist of more than one kind of pure form of matter. Mixtures can be separated by physical methods but pure substances especially compounds cannot be separated into chemical constituents by physical methods. Pure substance has same composition throughout. Soil and soft drinks are mixtures. Mixtures can be separated by various methods depending upon nature of substance present in it. Solution is a homogeneous mixture.
Q1: Name the process by which pure NaCl can be obtained from salt solution.
Ans: The process to obtain pure NaCl from a salt solution is known as crystallisation.
Q2: What are alloys-compounds or mixtures?
Ans: Alloys are homogeneous mixtures made from two or more metals or a combination of a metal and a non-metal. They cannot be separated into their individual components through physical methods. Key points about alloys:
- They retain the properties of their constituent materials.
- Alloys can have varying compositions.
- For example, brass is an alloy consisting of approximately 30% zinc and 70% copper.
Q3: What is size of particles in solution?
Ans: The size of particles in a solution is typically less than 1 nm (10-9 metres).
- These particles are so small that they cannot be seen with the naked eye.
- Due to their tiny size, they do not scatter light, making the path of light invisible in a solution.
- Particles in a solution cannot be separated by filtration.
- When left undisturbed, the particles do not settle, indicating that a solution is stable.
Q4: What is solute and solvent in cold drinks?
Ans: In cold drinks, the components are classified as follows:
Solutes: These are substances that dissolve in the solvent. In cold drinks, common solutes include:
- Carbon dioxide (CO2) gas
- Sugar
- Preservatives
Solvent: This is the substance that dissolves the solutes. In cold drinks, the solvent is: Water
(II) Study the table showing melting points and boiling points of certain compounds. Answer the questions based on the table and related studied concepts
Q1: Which one of the given substances may be separated by using a water condenser?
Ans: Pentane can be separated using a water condenser because:
- The temperature of the water condenser is 25°C.
- The boiling point of pentane is 36°C.
Since the boiling point of pentane is higher than the temperature of the condenser, it can be effectively condensed and separated.
Q2: How can gases be separated that are present in air?
Ans: The separation of gases present in air can be achieved through fractional distillation of liquid air.
Q3: If sample of urea has melting point 129°C, then:
(a) It is impure
(b) It is pure
(c) It can not be predicted
(d) The compound is not urea
Ans: (a) It is impure
Q4: Which of the following will have boiling point 100°C?
(a) Distilled water
(b) Sea water
(c) River water
(d) Well water
Ans: (a) Distilled water will have boiling point 100°C.
The document Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure?? is a part of the Class 9 Course Science Class 9.
All you need of Class 9 at this link: Class 9
|
84 videos|384 docs|61 tests
|
FAQs on Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??
| 1. What is meant by 'pure substances' in the context of matter? |  |
| 2. How can we differentiate between pure substances and mixtures? | |
Ans. Pure substances have a fixed composition and distinct properties, whereas mixtures can vary in composition and do not have uniform properties. Mixtures can be homogeneous (uniform throughout, like saltwater) or heterogeneous (not uniform, like a salad). The components of a mixture can be separated by physical methods, while pure substances cannot.
| 3. What are the methods to separate components of a mixture? | |
Ans. Common methods to separate components of a mixture include filtration, evaporation, distillation, and chromatography. Filtration is used for separating solid particles from liquids, evaporation is used to remove a liquid from a solution, distillation separates components based on their boiling points, and chromatography separates substances based on their movement through a medium.
| 4. Can you provide examples of pure substances and mixtures from everyday life? | |
Ans. Yes, examples of pure substances include elements like gold (Au) and compounds like table salt (NaCl) or sugar (C12H22O11). Examples of mixtures include air (a mixture of gases), salad (a mix of different vegetables), and concrete (a mixture of cement, water, and aggregates).
| 5. Why is it important to understand the difference between pure substances and mixtures in science? | |
Ans. Understanding the difference between pure substances and mixtures is crucial in science because it helps in the identification, classification, and analysis of materials. This knowledge is essential in various fields such as chemistry, medicine, and environmental science, where the properties and reactions of substances play a significant role in experiments and real-world applications.
Related Exams
About this Document
4.83/5
Rating
Mar 26, 2025
Last updated
Document Description: Case Based Question Answer: Is Matter Around Us Pure? for Class 9 2025 is part of Science Class 9 preparation.
The notes and questions for Case Based Question Answer: Is Matter Around Us Pure? have been prepared according to the Class 9 exam syllabus. Information about Case Based Question Answer: Is Matter Around Us Pure? covers topics
like and Case Based Question Answer: Is Matter Around Us Pure? Example, for Class 9 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Case Based Question Answer: Is Matter Around Us Pure?.
Introduction of Case Based Question Answer: Is Matter Around Us Pure? in English is available as part of our Science Class 9
for Class 9 & Case Based Question Answer: Is Matter Around Us Pure? in Hindi for Science Class 9 course.
Download more important topics related with notes, lectures and mock test series for Class 9
Exam by signing up for free. Class 9: Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??
Description
Full syllabus notes, lecture & questions for Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure?? - Class 9 | Plus excerises question with solution to help you revise complete syllabus for Science Class 9 | Best notes, free PDF download
Information about Case Based Question Answer: Is Matter Around Us Pure?
In this doc you can find the meaning of Case Based Question Answer: Is Matter Around Us Pure? defined & explained in the simplest way possible. Besides explaining types of
Case Based Question Answer: Is Matter Around Us Pure? theory, EduRev gives you an ample number of questions to practice Case Based Question Answer: Is Matter Around Us Pure? tests, examples and also practice Class 9
tests
Related Searches
ppt
,Free
,Important questions
,Previous Year Questions with Solutions
,Extra Questions
,Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??
,Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??
,shortcuts and tricks
,Exam
,Objective type Questions
,video lectures
,Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??
,mock tests for examination
,Semester Notes
,past year papers
,Sample Paper
,Viva Questions
,study material
,MCQs
,practice quizzes
,Summary
;
Additional Information about Case Based Question Answer: Is Matter Around Us Pure? for Class 9 Preparation
Case Based Question Answer: Is Matter Around Us Pure? Free PDF Download
The Case Based Question Answer: Is Matter Around Us Pure? is an invaluable resource that delves deep into the core of the Class 9 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Case Based Question Answer: Is Matter Around Us Pure? now and kickstart your journey towards success in the Class 9 exam.
Importance of Case Based Question Answer: Is Matter Around Us Pure?
The importance of Case Based Question Answer: Is Matter Around Us Pure? cannot be overstated, especially for Class 9 aspirants.
This document holds the key to success in the Class 9 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Case Based Question Answer: Is Matter Around Us Pure? Notes
Case Based Question Answer: Is Matter Around Us Pure? Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Case Based Question Answer: Is Matter Around Us Pure?.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Case Based Question Answer: Is Matter Around Us Pure? Notes on EduRev are your ultimate resource for success.
Case Based Question Answer: Is Matter Around Us Pure? Class 9 Questions
The "Case Based Question Answer: Is Matter Around Us Pure? Class 9 Questions" guide is a valuable resource for all aspiring students preparing for the
Class 9 exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Case Based Question Answer: Is Matter Around Us Pure? on the App
Students of Class 9 can study Case Based Question Answer: Is Matter Around Us Pure? alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Case Based Question Answer: Is Matter Around Us Pure?,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Case Based Question Answer: Is Matter Around Us Pure? is prepared as per the latest Class 9 syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup on EduRev and stay on top of your study goals
10M+ students crushing their study goals daily