Chapter – 2
Is Matter Around Us Pure
In this post we have given the detailed notes of class 9 Science Chapter 2 (Is Matter Around Us Pure) in English. These notes are useful for the students who are going to appear in class 9 board exams.
Board | CBSE Board, UP Board, JAC Board, Bihar Board, HBSE Board, UBSE Board, PSEB Board, RBSE Board |
Textbook | NCERT |
Class | Class 9 |
Subject | Science |
Chapter no. | Chapter 2 |
Chapter Name | (Is Matter Around Us Pure) |
Category | Class 9 Science Notes in English |
Medium | English |
Class 9 Science Chapter 2 Is Matter Around Us Pure in English
Explore the topics
- Chapter – 2
- Is Matter Around Us Pure
-
Chapter 2: Is Matter Around Us Pure
- 2.1 What is a Mixture? 🧪
- 2.1.1 Types of Mixtures 🌈
- 2.2 What is a Solution? 🥤
- Properties of a Solution ✨
- 2.2.1 Concentration of a Solution 🧪
- 2.2.2 What is a Suspension? 🥛
- Properties of a Suspension 🥛
- 2.2.3 What is a Colloidal Solution? 🥛
- Properties of a Colloid 🥛
- 2.3 Physical and Chemical Changes 🔄
- 2.4 What are the Types of Pure Substances? 🧪
Chapter 2: Is Matter Around Us Pure
2.1 What is a Mixture? 🧪
- Mixtures are made up of two or more pure substances mixed together. 🔄
- For example, seawater, soil, and air are mixtures. 💨🌱
- A pure substance has only one type of particle. 🔬
- For example, sugar and salt are pure substances. 🧂
2.1.1 Types of Mixtures 🌈
- Homogeneous mixtures have the same composition throughout. 💧
- For example, salt or sugar dissolved in water. 🍭
- Heterogeneous mixtures have physically distinct parts with different compositions. 🪨
- For example, a mixture of iron filings and salt. 🧲
2.2 What is a Solution? 🥤
- A solution is a homogeneous mixture of two or more substances. 🧪
- For example, lemonade and soda water are solutions. 🍹
- A solution has two parts: solute and solvent. 🧪
- The solute is the substance that dissolves in the solvent. 🧪
- The solvent is the substance that dissolves the solute. 🧪
- For example, in a saltwater solution, salt is the solute and water is the solvent. 🧪
Properties of a Solution ✨
- A solution is a homogeneous mixture. 🧪
- The particles in a solution are very small and cannot be seen with the naked eye. 🔬
- The particles do not scatter a beam of light, so the path of light is not visible in a solution. 🔦
- The solute particles cannot be separated by filtration. 🧪
- A solution is stable, meaning the particles do not settle down when left undisturbed. 🧪
2.2.1 Concentration of a Solution 🧪
- Concentration is the amount of solute present in a given amount of solution. 🧪
- It can be expressed in different ways, such as mass by mass percentage, mass by volume percentage, and volume by volume percentage. 🧪
- A saturated solution is a solution that has dissolved the maximum amount of solute at a given temperature. 🧪
- Solubility is the amount of solute present in a saturated solution at a given temperature. 🧪
- An unsaturated solution is a solution that has dissolved less than the maximum amount of solute at a given temperature. 🧪
2.2.2 What is a Suspension? 🥛
- A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. 🧪
- For example, a mixture of chalk powder and water is a suspension. 🧪
Properties of a Suspension 🥛
- A suspension is a heterogeneous mixture. 🧪
- The particles in a suspension are large enough to be seen with the naked eye. 🔬
- The particles scatter a beam of light, making its path visible (Tyndall effect). 🔦
- A suspension is unstable, meaning the particles settle down when left undisturbed. 🧪
- The solute particles can be separated by filtration. 🧪
2.2.3 What is a Colloidal Solution? 🥛
- A colloidal solution or colloid is a heterogeneous mixture in which the size of solute particles is intermediate between those in a solution and those in a suspension. 🧪
- For example, milk is a colloidal solution. 🥛
Properties of a Colloid 🥛
- A colloid is a heterogeneous mixture. 🧪
- The particles in a colloid are small enough that they cannot be seen with the naked eye. 🔬
- The particles scatter a beam of light, making its path visible (Tyndall effect). 🔦
- A colloid is stable, meaning the particles do not settle down when left undisturbed. 🧪
- The solute particles cannot be separated by filtration but can be separated by centrifugation. 🧪
2.3 Physical and Chemical Changes 🔄
- Physical changes are changes that do not alter the chemical composition of a substance. 🔄
- For example, melting, boiling, and changes in state. 💧❄️
- Chemical changes are changes that alter the chemical composition of a substance. 🔄
- For example, burning and rusting. 🔥
2.4 What are the Types of Pure Substances? 🧪
- Elements are pure substances that cannot be broken down into simpler substances by chemical reactions. 🧪
- For example, oxygen, hydrogen, and iron are elements. 🧪
- Compounds are pure substances formed when two or more elements chemically combine in a fixed ratio. 🧪
- For example, water (H2O) is a compound formed from hydrogen and oxygen. 💧
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Category: Class 9 Science Notes in English