Class 9 Exam > Class 9 Notes > Important Concepts : Is Matter Around Us Pure, Class 9, Science
Important Concepts : Is Matter Around Us Pure, Class 9, Science PDF Download
Class IX: Chemistry
Chapter 2: Is Matter Around Us Pure
Top Concepts
1. Anything which has mass and occupies space is called matter.
2. Matter can be classified as pure substances or mixtures.
3. A pure substance may either contain constituent particles of only one kind or of different kinds. A pure substance has a fixed composition.
4. An element is a basic form of matter which cannot be broken down into simpler substances by any physical or chemical means.
5. Elements can be broadly classified as metals, non-metals and metalloids.
6. Metals are one category of elements that have lustre. They conduct heat and electricity. They are sonorous .They are malleable and ductile.
7. Non metals do not have lustre, are not sonorous and are bad conductors of heat and electricity.
8. Metalloids are elements having properties intermediate between those of metals and non metals.
9. A compound is a pure substance composed of two or more elements chemically combined in a fixed proportion. It can be broken down into simpler substances by chemical or electrochemical methods.
10. A mixture contains two or more elements or compounds which are mixed together in any proportion. In a mixture no new compound is formed. A mixture shows the properties of the constituent substances.
11. Mixtures are classified are homogeneous or heterogeneous mixture.
12. Mixtures whose components mix completely with each other to make a uniform composition are called homogeneous mixtures.
13. Mixtures whose components mix completely with each other to make a uniform composition are called homogeneous mixtures.
14. A heterogeneous mixture has a non-uniform composition.
15. The ability of a substance to dissolve in another substance is called solubility.
16. Homogeneous mixture of two or more substances is called a solution.
17. Component of a solution present in small quantity is called a solute.
18. Component of a solution present in large excess is called a solvent.
19. Solution with high solute concentration is called concentrated solution and those with low concentration is called dilute solution
20. A solution that has dissolved maximum amount of solute at any particular temperature is said to be a saturated solution.
21. If the amount of solute contained in a solution is less than the saturation level, it is called an unsaturated solution.
22. The concentration of a solution is the amount of solute present in a given amount (mass or volume) of solvent or solution.
23. Percentage by mass is one of the methods of expressing concentration of solution.
24. There are two kinds of heterogeneous mixtures, colloids and suspensions.
25. Colloids are mixtures with particle sizes from 1 nm to 1000 nm.
26. The component of colloid present in small amount is called dispersed phase.
27. The medium in which colloidal particles dispersed or suspend themselves is called dispersion medium.
28. In a colloidal system particles are always suspended and do not settle down. This constant colliding of the particles in continuous motion is called Brownian movement.
29. Scattering of a beam of light when light is passed through a colloidal solution is called the Tyndall effect
30. Colloids are classified according to the state (solid, liquid or gas) of the dispersed medium or dispersing medium and the dispersed phase.
31. Colloid in which dispersed medium is a liquid and dispersed phase is solid, it is called as sol.
32. Colloid in which both dispersed phase and dispersed medium are in liquid state is called as an emulsion.
33. Colloid in which dispersed phase is either liquid or a solid and dispersed medium is a gas is called as aerosol.
34. A suspension is heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout bulk of medium. Particles of suspension are visible to naked eye. Suspensions are heterogeneous mixtures with particles that have a size greater than 1000 nanometers.
35. Magnetic impurities can be separated from non-magnetic impurities by magnetic separation.
36. Volatile compounds can be separated from non-volatile compound by sublimation.
37. Mixtures of two or more liquid components can be separated by simple or fractional distillation or by using a separating funnel.
38. Simple distillation is used for separating liquids having a difference in boiling points of more than or equal to 25 K.
39. Fractional Distillation is used for separating liquids having a difference in boiling points of less than 25 K.
40. Liquids that are immiscible in each other differ in their densities and so can be separated by making use of a separating funnel.
41. The process, by which a soluble solid can be obtained from a solution by allowing the solvent to vaporize, is called evaporation.
42. Chromatography is used for separation of those solutes which dissolve in same solvent
43. Chromatography is a method of separating and identifying various components in a mixture, which are present in small trace quantities.
44. Mixture containing two solid substances out of which one is soluble in a particular solvent and other is insoluble can be separated by dissolving the
soluble constituent in a suitable solvent and then separating the insoluble substance through filtration.
45. This process of separating the suspended particles of an insoluble substance, from a liquid, by rotating it at high speed is called centrifugation.
46. The change in which the shape, size, appearance or state of a substance may alter but its chemical composition remains the same is called a physical change. In a physical change no new substance is formed.
47. Any change that involves the formation of a new substance and leads to a transformation of chemical identity is called chemical change.
48. Chemical changes are usually accompanied with heat exchanges. Chemical changes are permanent changes which are usually irreversible.
FAQs on Important Concepts : Is Matter Around Us Pure, Class 9, Science
| 1. What is the definition of a pure substance? |  |
Ans. A pure substance is a form of matter that has a uniform and definite composition throughout its structure. It consists of only one type of particle, either atoms or molecules.
| 2. How can we differentiate between a mixture and a pure substance? | |
Ans. A mixture is a combination of two or more substances that are physically mixed together but can be separated by physical means. In contrast, a pure substance cannot be separated into other substances by physical methods and has a fixed composition.
| 3. What are the different types of mixtures? | |
Ans. Mixtures can be classified into two types: homogeneous mixtures and heterogeneous mixtures. Homogeneous mixtures have a uniform composition throughout and cannot be visibly distinguished, while heterogeneous mixtures have non-uniform composition and can be visibly distinguished.
| 4. Can impurities be present in a pure substance? | |
Ans. No, a pure substance does not contain any impurities. It has a definite and uniform composition, free from any other substances.
| 5. How can we separate a mixture into its components? | |
Ans. Mixtures can be separated into their components using various physical separation techniques. Some common methods include filtration, evaporation, distillation, magnetic separation, and chromatography. These methods exploit the physical properties of the components, such as solubility, boiling point, and magnetic properties, to separate them.
Related Exams
About this Document
|
4K Views |
|
4.91/5 Rating |
|
Nov 15, 2024 Last updated |
Document Description: Important Concepts : Is Matter Around Us Pure, Class 9, Science for Class 9 2024 is part of Class 9 preparation. The notes and questions for Important Concepts : Is Matter Around Us Pure, Class 9, Science have been prepared according to the Class 9 exam syllabus. Information about Important Concepts : Is Matter Around Us Pure, Class 9, Science covers topics like and Important Concepts : Is Matter Around Us Pure, Class 9, Science Example, for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Important Concepts : Is Matter Around Us Pure, Class 9, Science.
Introduction of Important Concepts : Is Matter Around Us Pure, Class 9, Science in English is available as part of
our Class 9 preparation & Important Concepts : Is Matter Around Us Pure, Class 9, Science in Hindi for Class 9
courses. Download more important topics, notes, lectures and mock test series for Class 9
Exam by signing up for free. Class 9: Important Concepts : Is Matter Around Us Pure, Class 9, Science
Description
Full syllabus notes, lecture & questions for Important Concepts : Is Matter Around Us Pure, Class 9, Science - Class 9 | Plus excerises question with solution to help you revise complete syllabus | Best notes, free PDF download
Information about Important Concepts : Is Matter Around Us Pure, Class 9, Science
In this doc you can find the meaning of Important Concepts : Is Matter Around Us Pure, Class 9, Science defined & explained in the simplest way possible.
Besides explaining types of Important Concepts : Is Matter Around Us Pure, Class 9, Science theory,
EduRev gives you an ample number of questions to practice Important Concepts : Is Matter Around Us Pure, Class 9, Science tests, examples and also practice Class 9 tests.
Download as PDF
|
Explore Courses for Class 9 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Objective type Questions
,Class 9
,MCQs
,study material
,Important Concepts : Is Matter Around Us Pure
,Science
,Important questions
,Semester Notes
,Important Concepts : Is Matter Around Us Pure
,shortcuts and tricks
,Extra Questions
,Class 9
,Viva Questions
,Class 9
,Summary
,Science
,practice quizzes
,ppt
,Important Concepts : Is Matter Around Us Pure
,mock tests for examination
,Sample Paper
,past year papers
,video lectures
,Science
,Free
,Previous Year Questions with Solutions
,Exam
;
Additional Information about Important Concepts : Is Matter Around Us Pure, Class 9, Science for Class 9 Preparation
Important Concepts : Is Matter Around Us Pure, Class 9, Science Free PDF Download
The Important Concepts : Is Matter Around Us Pure, Class 9, Science 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 Important Concepts : Is Matter Around Us Pure, Class 9, Science now and kickstart your journey towards success in the Class 9 exam.
Importance of Important Concepts : Is Matter Around Us Pure, Class 9, Science
The importance of Important Concepts : Is Matter Around Us Pure, Class 9, Science 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.
Important Concepts : Is Matter Around Us Pure, Class 9, Science Notes
Important Concepts : Is Matter Around Us Pure, Class 9, Science Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Important Concepts : Is Matter Around Us Pure, Class 9, Science.
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, Important Concepts : Is Matter Around Us Pure, Class 9, Science Notes on EduRev are your ultimate resource for success.
Important Concepts : Is Matter Around Us Pure, Class 9, Science Class 9 Questions
The "Important Concepts : Is Matter Around Us Pure, Class 9, Science 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 Important Concepts : Is Matter Around Us Pure, Class 9, Science on the App
Students of Class 9 can study Important Concepts : Is Matter Around Us Pure, Class 9, Science alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Important Concepts : Is Matter Around Us Pure, Class 9, Science,
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 Important Concepts : Is Matter Around Us Pure, Class 9, Science is prepared as per the latest Class 9 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup