rayat shikshan sanstha, satara karmaveer vidya prabodhini, satara. madhya vibhag powerpoint...

RAYAT SHIKSHAN SANSTHA, SATARA

KARMAVEER VIDYA PRABODHINI, SATARA.

MADHYA VIBHAG

POWERPOINT PRESENTATION

9TH STD.-SCIENCE & TECHNOLOGY WITH SYLLABUS 2011-12

RAYAT SHIKSHAN SANSTHA,SATARA KARMAVEER VIDYA PRABODHINI,

MADHYA VIBHAG, SATARA

99THTH 4.COUNTING MATTER SCIENCE STD. 4.COUNTING MATTER SCIENCE STD. & TECH-PPT & TECH-PPT

UNIT :- COUNTING MATTER

SUB UNITS :-4.1..LAWS OF CHEMICAL COMBINATION4.2- THE ATOM 4.3- MOLECULE 4.4- MOLECULAR MASS &MOLE CONCEPT 4.5 – CHEMICAL FORMULAE OF COMPOUNDS

DEFINITIONMatter- Matter is anything around us that

we can perceive through our senses.




LAW OF CONSERVATION OF MATTER “Matter is neither gained nor lost

during a chemical reaction.” This is called the law of conservation of matter.




LAW OF CONSTANT PROPORTION -

“In a compound, constituent elements are always present in a definite proportion by weight.” It is called the law of constant proportion.




SYMBOLSThe symbol of any element indicates one

atom of that element.

Symbol of the element is the first letter of the name of the element or first letter and second/other prominent letter in the name.”




CHEMICAL SYMBOLS OF THE ELEMENTS

Hydrogen - Iron - ♂Copper - ©Sulphur -




MOLECULE - Molecule is made up of two or

more atoms of elements.

Atoms of some elements exist

independently.

e.g.- H2 , Cl2 , O2 .




MOLECULAR MASS - ‘The sum of the atomic masses of the atoms present in a given molecule is the molecular mass of the substance.’ e.g.- Molecular mass of CO2 = 44

and H2O= 18




MOLE - A collection of Avogadro’s number objects of the same type (such an atoms or molecules) is called a mole.




RADICALS - Atoms or group of atoms having a positive or negative charge are known as radicals.




VALENCY- The combining capacity of an element is known as its valency .




VALENCY- Hydrogen - Carbon - Sodium - Nitrogen - Oxygen -

1 4 1 3 2




VALENCY- Neon - Aluminium - Chlorine - Calcium - Magnesium -

03122




SODIUM BROMIDE - Chemical formula of Sodium

bromide is NaBr. The formula is obtain as follows – Symbol of Sodium is - Na & Symbol of Bromine is – Br.




Now, The valency of Sodium is +1 & The valency of bromine is -1.Now, Cross multiply the valencies Na Br

+1 -1 The formula of sodium bromide is NaBr




CALCIUM SULPHATE - Chemical formula of Calcium sulphate is NaBr.

The formula is obtain as follows –

Symbol of Calcium is - Ca & Symbol of Sulphate is – So4




Now, The valency of Calcium is +2 & The valency of Sulphate is -2.Now, Cross multiply the valencies Ca So4

+2 -2 The formula of Calcium Sulphate is CaSo4




RAYAT SHIKSHAN SANSTHA,SATARA

9TH STD.-SCIENCE & TECHNOLOGY WITH SYLLABUS 2011-12

MAHARAJA SAYAJIRAO VIDYALAYA, SATARA.

Shri . SAYYAD J. M.

rayat shikshan sanstha, satara karmaveer vidya prabodhini, satara. madhya vibhag powerpoint...

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