fundamentals of chemistry

Class 9 Chemistry Fundamentals of Chemistry Important Q/A for Exams

Class 9 Chemistry Fundamentals of Chemistry Important Q/A for Exams: Chemistry branch of science which deals with Composition of matter Properties of matter Changes in matters Different laws and principles which deals with these changes Internal Structure Matter  Anything in the universe which occupy space (having volume) and has mass is called matter. Matters can …

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Avogadro’s Number and Mole – How is Mole Calculated

Mole is a counting device or a number like: 12 things   =  Dozen 144 things  =  Gross 2 things = Pair 1000 g    =   1k g similarly: 6.022 x 1023 particles =1 mole Mole Definition: In Chemistry , mole is defined as the amount of substance that exactly contains 6.022 x 1023 particles. . For …

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Types of Substances – Elements and Compounds Properties and Types

Substances: A sample of pure matter is called a substance or anything whose composition is uniform throughout and has well-defined physical and chemical properties is called a substance. E.g. Silver, Gold, Water, NaCl, etc. Types of Substances: They are of two types: i) Elements         ii) Compound Element  That pure substance that can’t …

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Difference between Formula unit and Formula mass

What is Formula unit? In Chemistry, the simplest ratio between cations & anions in an ionic compound is called formula unit. OR: Simplest unit whose repetition builds crystal is called formula unit. Usually for ionic compounds their empirical formula is their formula unit while for covalent compound their molecular formula is their formula unit. For …

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Chemical Formula | Difference between Empirical Formula and Molecular Formula – Chemistry Notes

What is Chemical Formula? The symbolic representation of a compound that shows elements in the compound and also the ratio of their atoms is called chemical formula. As elements are represented by symbols . Similarly, compounds are symbolically represented by chemical formulas . CHEMICAL FORMULAS : Calcium Carbonate = CaCO3 Water = H2O Sulphuric acid …

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