Is Matter Around Us Pure Class 9 Notes CBSE Science Ch 2
CBSE NCERT based Class 9 Revision Notes Science contains Chapter 2 atoms and molecules topics given in textbook are part of Revision Notes for Class
Science Notes cover an overview of the main given points of every concepts and Topics in the NCERT TextBooks Class 9th Science this Chapter Revision Notes includes topic/concepts wise explanations for all the topic provided in the book such as solute , soluble, Pure Substance: It consists of one types of particles which are exactly same in their chemical nature. (ii) Mixtures: Mixture consists of two or more particles of different types of particles The term i e, "pure substance" is a substance that has only one component and nothing else.
Well prepared Class 9th Science All chapters Notes will guidance students understand the topics ,concepts and themes covered in all the chapters of Ncert Text book of 9th Revision Notes
Is Matter Around Us Pure
Is Matter Around us Pure
Matter
Pure Substance
Mixtures
Elements
Compound
Homogeneous mixture (Solutions)
Heterogenous mixtures (Suspension and colloids)
Matter
Pure Substance
⚫A pure substance is one which is made up of only one kind of particles, which are same in their chemical Nature.
All elements and compounds are pure substances Example: Hydrogen oxygen gold, Silver, carbon dioxide and Sodium chloride
Mixture
A mixture is one which contain two or more different kind of particles Example: Milk, Sugar solution minerals, petroleum, LPG, Tap water, Tea, Coffee.
Elements
According to Antoine Laurent Lavoisier element is the Basic form of Matter, that cannot be broken down into simpler substances chemical reaction
Cannot be split up into two or more simple substance because it is made up of one kind of Atom. "Elements are normally divided into metals and Non-metals and Metalloids"
Metals
A Metal is a substance, that is Malleable, and ductile and conduct electricity
Example: Iron, Copper, Aluminium, Zine, Gold, Silver etc.
All the metals are sold except one metal that is mercury which is liquid.
1. Properties of Metals
1. They have a lustrous (Shine): Gold, Silver, Copper are shiny metals (most metals are silver - grey column)
2. They conduct heat and electricity. It means metals are generally good conductor of Heat, silver metal is best conductor of heat.
Copper and Aluminium Metals are also very good conductors of Heat, this is the reason why cooking utensils are made up of copper and Aluminium. Poorest Conductor of Heat among the Metals are lead and Mercury electric wires are
3. Metals are Generally Hard: very hard
made up of copper and Aluminium Metal because they are good conductor Most of metals are hard except sodium, Potassium. Metals like iron, copper, Aluminium etc. are
4. Metals are Malleable:
This means that metals can be beaten into sheets with a hammer, without breaking.
Aluminium, Copper, gold, silver are highly malleable metals. Example: Aluminium foils are used for packing food items like Biscuits, Chocolates etc.
"Malleability is an important Characteristic Property"
5. Metals are Ductile:
This means that Metals can be stretched into thin wires, gold and silver are best ductile metals.
Cu and Al are also very ductile so used in making electrical wires
6. They are Sonorous:
Metals make a ringing sounds when we strike them, this is why metals are used for making bells, musical instuments etc.
7. Non-Metal:
A Non-Metal is an element that is neither Malleable nor ductile and does not conduct electricity
Example: Carbon, Sulphur, Hydrogen, Oxygen etc.
Properties of Non-Metals
1. Non-Metals are Not-Malleable:
Non-metals cannot be beaten into thin sheets with a Hammer; Non-metals are Brittle, when beaten with a hammer, they break into small pieces.
"Brittleness is characteristic property of solid Non-Metal"
2. Non-Metals are Not-Ductile:
Metals cannot be drawn into wires.
Example: Sulphur and phosphorus are Non-Metals and they are Not Ductile "Non-Metals are Nither Malleable nor Ductile".
3. Non-Metals are Bad Conductor of Heat and Electricity:
Non-Metals do not allow, Heat and Electricity.
Example: Sulphur and Phosphorus are Non-Metals and they are bad Conductor of Electricity.
4. Non-Metals are Not Sonorous:
Solid Non-Metals do not Make Ringing sounds.
5. Non-Metals are generally soft:
Most of the solid Non-metals are of they can be easily cut using knife, but diamond is the Hardest Natural substance.
6. Comparison Among the Properties of Metal and Non-Metal:
Metal
Non-Metal
1.Non-Metals are Brittle. 2. Non-Metals are Bad Conductors of
1. Metals are Malleable and ductile
2. Metals are good conductor of
Heat and Electricity.
3. Metals are lustrous (Shiny)
4. Metals are Sonorous
Heat and Electricity.
3. Non-Metals are Non-lustrous
4.Non-Metals are not Sonorous
Metalloids
Which show some properties of Metals and some properties of Non-metal Metalloids are also sometimes called semi-metals
The important examples of Metalloids are
• Boron
• Silicon
• Germanium
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