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Notes ⇒ Class 9th ⇒ Science ⇒ 2. Is Matter around us Pure

Notes 2. Is Matter around us Pure - Pure Substances | Class 9 Science - Toppers Study

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2. Is Matter around us Pure

| Pure Substances |

Notes 2. Is Matter around us Pure - Pure Substances | Class 9 Science - Toppers Study


2.  Is Matter around us Pure?

(Science-IX)

Introduction:

We have learnt earlier that "The obejct which occupy space and having mass is a matter. "

Pure Substance: A pure substance consists of a single type of particles and all the constituent particles of that substance are the same in their chemical nature.

Element: An element as a basic form of matter that cannot be broken down into simpler substances by chemical reactions. Examples: Iron, gold, silver, carbon, oxygen, nitrogen and sodium etc.

All metals, non-metals and Metelloids come in elements. 

       

Properties of Metals: 

(1)   These are lustre (shine). 

(2)   They conduct heat and electricity.  

(3)    All metals are malleable and ductile. 

(4)   They are sonorous.

(5)  They have silvery-grey or golden-yellow colour. 

Properties of Non-metals:

(1)   These are not lustrous.

(2)  They are poor conductors of heat and electricity.  

(3)   All metals are not malleable and ductile. 

(4)   They are not sonorous. 

(5) They display a variety of colours. 

Metalloids: Some elements have intermediate properties between those of metals and non-metals, they are called metalloids; examples are boron, silicon, germanium etc.

Compounds : A compound is a substance composed of two or more elements, chemically combined with one another in a fixed proportion. Examples: Water, Salt, sugar, Alcohal, carbon dixode etc. 

Name of compounds Composed substance
1.  Water Two part Hydrogen and one part oxygen 
2.  Salt One part sodium and one part chlorine.
3.  Carbon-dioxide One part carbon and two part oxygen

Note: Above all substances are composed in definite/fixed proportion. These substances cannot be seperated without any chemical process. All components by which they are made are differ to compound.  

Mixture: Such substances which are composed of two or more than two elements or compound in indefinite proportion are called mixture.

Examples of mixtures:

Sugar in water, 

salt in water,

air, 

Mixture of salt and sand. 

salt and iron fills

soda water.

Differences between compound and mixture: 

 

   Mixture    Compound

 1. Element or compound just mix together to from a mixture. 

 2. It does not form a new substance.

3. A mixture has a variable composition.

4. It's components can be seperated by physical methods.  

5. A mixture shows the properties of the constituents substances.

6. Components have no fixed proportion.  

 1. Element react to from new compounds.

 2. It is a new sunstance.

3. The composition of each new substance is always fixed.

4. It only can be seperated by chemical process.  

5. The new substance has totally different propreties.

6. Components have no fixed proportion.

 

Differences between elements and compounds: 

    Elements      Compounds

 1. Elements contain single kinds of atoms.

 2. They can neither be seperated by physical methods of seperating nor chemical methods.  

 3. They are basic form of matters. 

 1. Compounds contains two or more than two kinds of atoms. 

 2. They can only be seperated by chemical process of seperating. 

 3. They are mainly made of elements. 

 

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Study Materials List:

Notes ⇒ Class 9th ⇒ Science
1. Matter in Our Surroundings
2. Is Matter around us Pure
3. Atoms and Molecules
4. Structure of The Atom
5. The Fundamental Unit of Life
6. Tissues
7. Diversity in Living Organisms
8. Motion
9. Force and Laws of Motion
10. Gravitation
11. Work and Energy
12. Sound
13. Why Do We Fall ill
14. Natural Resources
15. Improvement in Food Resources

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