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Chemistry Study Materials for Class 9, Schemes and Mind Maps of Chemistry

Chemistry

Lemonade is a mixture of three substances, Lemon Juice, Sugar and Water. ... Still, lemonade is a homogeneous mixture.

Typology: Schemes and Mind Maps

2022/2023

Uploaded on 03/01/2023

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Chemistry Study Materials for Class 9
(NCERT based Revision Notes on Chapter - 2)
Ganesh Kumar Date:- 27/07/2020
Is Matter Around Us Pure
What is a substance?
Anything that cannot be broken into further particles by applying any physical processes
is called a Substance.
Matter can be classified into two types of substances – Pure substances and Mixtures
What is a pure substance?
A substance that consists of only one type of particle is called a Pure Substance.
For Example, Diamond, Salt, Sulfur, Tin.
What is a mixture?
When we combine different substances into each other a mixture is formed.
For Example,
Lemonade is a mixture of three substances, Lemon Juice, Sugar and Water.
Which of these is a mixture or a pure substance?
(Water, Copper, Chocolate cake, Hydrogen, Soil, Air)
Mixture – Chocolate cake, Soil, Air
Pure substance – Water, Copper, Hydrogen
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Chemistry Study Materials for Class 9

(NCERT based Revision Notes on Chapter - 2 )

Ganesh Kumar Date:- 27/07/

Is Matter Around Us Pure

What is a substance?  Anything that cannot be broken into further particles by applying any physical processes is called a Substance.  Matter can be classified into two types of substances – Pure substances and Mixtures What is a pure substance? A substance that consists of only one type of particle is called a Pure Substance. For Example , Diamond, Salt, Sulfur, Tin. What is a mixture? When we combine different substances into each other a mixture is formed. For Example , Lemonade is a mixture of three substances, Lemon Juice, Sugar and Water. Which of these is a mixture or a pure substance? (Water, Copper, Chocolate cake, Hydrogen, Soil, Air) Mixture – Chocolate cake, Soil, Air Pure substance – Water, Copper, Hydrogen

Types of Mixtures There are two categories of mixtures: Homogeneous Mixtures and Heterogeneous Mixtures Homogenous Mixtures  When we add sugar, water and lemon juice together they all uniformly mix with each other. Now it is no possible to separate these substances from the mixture. Such mixtures in which the components mix with each other uniformly are called Homogenous Mixtures.  The ratio of compositions of homogeneous mixtures can be different. For Example , one may add two spoons of sugar in lemonade while someone else may add only one spoon of sugar in their lemonade. Still, lemonade is a homogeneous mixture. Heterogeneous Mixtures  The components in a heterogeneous mixture do not completely dissolve in each other and we can separate them by physical means. In other words, the composition of such mixtures is not uniform.