TRADING MASTERS

✅ Atomic and Molecular Masses ➖Atomic Mass: Mass of an atom. Reported in atomic mass unit “amu” or unified mass “u” One atomic mass unit i.e. amu, is the mass exactly equal to one-twelfth the mass of one carbon-12 atom. ➖Molecular Mass: Mass of a molecule of covalent compound. It is equal to the sum of atomic masses of all the elements present in the molecule. Formula Unit Mass Mass of a molecule of an ionic compound It is also equal to the sum of atomic masses of all the elements present in the molecule ✅ Mole Concept: ➖Mole: Unit of amount of substance. One mole amount of substance that contains as many particles or entities as there are atoms in exactly 12 g of the 12C isotope. ➖Molar mass: Mass of one mole of a substance in gram Molar mass in gram in numerically equal to atomic/molecular/formula mass in amu or u. ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @Ethio_Educational_News 📚JOIN: @EUEE_TIPS 📚JOIN: @Et_Study_Notes

📚 Some Basic Concepts of Chemistry 📚 Matter: Anything that exhibits inertia is called matter. The quantity of matter is its mass. Classification of Matter:- Based on chemical composition of various substances. 📍Elements: ➖It is the simplest form of the matter. ➖Smallest unit of an element is known as atom. ➖Total number of the known elements is 118 out of which 98 elements occur naturally and 20 are formed by artificial transmutation. ➖Examples: Na, K, Mg. Al, Si, P, C, F, Br etc. 📍Compound: ➖It is a non-elemental pure compound. ➖Formed by chemical combination of two or more atoms of different elements in a fixed ratio. ➖Examples: H2O, CO2, C6H12O6 etc. 📍Mixture: ➖Formed by physical combination of two or more pure substances in any ratio. ➖Chemical identity of the pure components remains maintained in mixtures. ➖Homogeneous mixtures are those whose composition for each part remains constant. ➖Example, Aqueous and gaseous solution. ➖Heterogeneous mixtures are those whose composition may vary for each and every part. ➖Example, Soil and concrete mixtures. 🧩Dalton’s Atomic Theory: ➖Every matter consists of indivisible atoms. ➖Atoms can neither be created nor destroyed. ➖Atoms of a given element are identical in properties ➖ Atoms of different elements differ in properties. ➖Atoms of different elements combine in a fixed ratio to form molecule of a compound. 🧩Precision and Accuracy: ➖Precision: Closeness of outcomes of different measurements taken for the same quantity. ➖Accuracy: Agreement of experimental value to the true value 🧩Laws of Chemical Combination: ➖Law of conservation of mass: “For any chemical change total mass of active reactants are always equal to the mass of the product formed” ➖Law of constant proportions: “A chemical compound always contains same elements in definite proportion by mass and it does not depend on the source of compound”. ➖Law of multiple proportions: “When two elements combine to form two or more than two different compounds then the different masses of one element B which combine with fixed mass of the other element bear a simple ratio to one another” ➖Law of reciprocal proportion: “ If two elements B and C react with the same mass of a third element (A), the ratio in which they do so will be the same or simple multiple if B and C reacts with each other”. ➖Gay Lussac’s law of combining volumes: “At given temperature and pressure the volumes of all gaseous reactants and products bear a simple whole number ratio to each other”. ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @Ethio_Educational_News 📚JOIN: @EUEE_TIPS 📚JOIN: @Et_Study_Notes