JKBOSE Class 9th Chemistry PDF Notes Download. Get the Full Notes of Class 9th Chemistry Solution with PDF Download. All the below Notes are given according to JKBOSE Syllabus. The notes are also for revisions of JKBOSE Class 9th Chemistry. JKBOSE Class 9th Chemistry PDF Notes Download.
JKBOSE Class 9th Chemistry PDF Notes Download
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According to John Dalton, matter is divided into small particles called atoms hence the atomic theory of matter. Each element has Atoms of the same element are identical, Atoms of different elements are different, Chemical reactions are processes that change the; arrangement of the atoms…
Compound contains two or more different elements and these elements cannot be broken down into simpler substances. They are formed through the combination of two or more elements in a certain ratio known as compound ratio. A compound is an intimate blend of two or more substances in which each substance preserves its own characteristics and can be separated mechanically.
The periodic table is an arrangement of elements in the form of a table grouped according to atomic number, electron arrangement, and chemically similar elements with similar properties. They are arranged in a tabular form, with the elements grouped in vertical columns called groups or families based on similarities and in horizontal rows called periods based on the energy levels.
Acids are compounds that dissociate in water to release hydrogen ions (H⁺) while bases dissociate in water to release hydroxide ions (OH⁻). Acids have sour taste and can erode metals while bases have a soapy feel and bitter taste. The concentration of acids and bases is expressed on the pH scale, and it shows that acids are below 7 and bases are above 7.
The law of conservation of mass also known as ‘conservation of matter’ offers that the total mass of the reactants in a chemical reaction is equal to the total mass of the products. This postulate attributed to Antoine Lavoisier states that in a chemical reaction, the matter undergoes a change in its form but does not increase or decrease.
Chemical Reaction refers to the process that substances known as reactants transform into new substances known as products. Some of the signs of a chemical reaction are such as colour change, production of gas, formation of a precipitate and changes in energy. Chemical reactions are represented through symbols and chemical formulas by means of chemical equations.
