Is Matter Around Us Pure Class 9 Notes - We have provided a synopsis as well as revision notes for Class 9 Science Chapter 2. This set of CBSE notes includes CBSE Key Notes, CBSE Revision Notes, Short Key Notes, photos, and diagrams for the entire Chapter 2 titled Is Matter Around Us Pure of Science, which was taught in class 9. If you are a class 9 student utilising the NCERT Textbook to study Science, you will come across Chapter 2 Is Matter Around Us Pure. You must be looking for notes to memorise after you have studied the lecture. You can find all of Chapter 2 Is Matter Around Us Pure class 9 notes in one place here. You should also read NCERT Solutions for Class 9 Science subject 2 Is Matter Around Us for a better understanding of this subject.
Chapter 2
Is Matter Around Us Pure?
Introduction to Matter
Matter:
The substance which has mass and occupies a certain space is called matter. The matter can be divided into two types:
What is a Mixture?
⇒The mixture is formed by combining two or more substances in which each substance retains its characteristics.
⇒ There are two types of mixture, homogeneous and heterogeneous.
(a) Homogeneous Mixture:
A mixture that has the same proportions of its components throughout the mixture is called a homogeneous mixture. For example, the air is a homogeneous mixture because it contains mixtures of different gases like nitrogen gas, oxygen gas, and so on.
(b) Heterogeneous Mixture:
A mixture that has varied proportions of its components throughout the mixture is called a heterogeneous mixture. For example, the soil is a heterogeneous mixture that consists of pebbles, sand, and plant matter which remain separate in the mixture.
What is Solution?
A solution is defined as a substance in which two or more substances are completely dissolved into each other and cannot be filtered out.
⇒ The solution is a special type of homogenous mixture in which only one type of phase is present. For example, lemonade is a solution.
⇒ The properties of a solution are shown below:
- It is a homogeneous mixture.
- The particles of solution are smaller than 1nm in diameter, so they cannot be seen through the naked eye.
- It does not show the Tyndall effect.
- It cannot be filtered.
⇒ The concentration of a solution is the amount of solute present in a given. amount (mass or volume) of the solution or the amount of solute dissolved in a given mass or volume of solvent.
⇒ It is expressed as:
What is a Suspension solution?
⇒ A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium.
⇒ The properties of a suspension solution are as follows:
- It is a heterogeneous mixture.
- The size of particles of suspension is greater than 1000nm.
- It shows the Tyndall effect.
- It can be filtered.
What is Colloidal solution?
The colloidal solution is the solution in which the particles of a colloid are. uniformly spread throughout the solution.
⇒ The properties of a colloidal solution are as follows:
- It is a heterogeneous mixture.
- The size of particles of colloid is between 1nm to 1000nm, so it is not visible to the naked eye.
- It shows the Tyndall effect.
- It cannot be filtered.
Types of colloidal solution:
What are the Types of Pure Substances?
⇒ The substance which has a fixed structure and is made up of only one kind of particle is called a pure substance.
⇒ A pure substance is of two types: elements and compounds.
◆ Element:
⇒ Element is defined as a basic form of matter that cannot be broken down into simpler substances by chemical reactions.
⇒ The element is classified into metals, non-metals and metalloids.
⇒ The substance which conducts heat and electricity and is lustrous is called metal while the substance that is a non-lustrous and bad conductor of electricity and heat is called non-metal.
⇒ The metalloid is a substance which certain properties of a metal and certain properties of a non-metal. For example, silicon is a metalloid.
◆ Compound:
⇒ The compound is the substance that is prepared by combining two or more elements in a fixed proportion. For example, water is a compound.
The difference between mixture and compound is shown below:
NCERT Class 9 Science Notes
- Chapter 1 Matter in Our Surroundings Class 9 Notes
- Chapter 2 Is Matter Around Us Pure Class 9 Notes
- Chapter 3 Atoms and Molecules Class 9 Notes
- Chapter 4 Structure of the Atom Class 9 Notes
- Chapter 5 The Fundamental Unit of Life Class 9 Notes
- Chapter 6 Tissues Class 9 Notes
- Chapter 7 Motion Class 9 Notes
- Chapter 8 Force and Laws of Motion Class 9 Notes
- Chapter 9 Gravitation Class 9 Notes
- Chapter 10 Work and Energy Class 9 Notes
- Chapter 11 Sound Class 9 Notes
- Chapter 12 Improvement of Food Resources Class 9 Notes
