1 mole of any substance can be defined as: Amount of a substance that contains as many particles (atoms‚ molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one mole
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work invested in school is rewarded with more. Where kids have no saying cause mummy knows best or where a social life is not allowed. She got the results‚ but is that really the right way? “Why Chinese mothers are superior” was an article written by Amu Chua and brought in the Wall street journal in 2011. The article enlightens the cultural differences between the Asian- and
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Born in 1254 in Venice‚ Marco Polo is today a well-known figure of pre-Renaissance travels‚ and for his ground breaking travels to lands never before journeyed by Europeans. He was an Italian traveler and author‚ and spent the majority of his life travelling and exploring. His father Nicolo and uncle Maffeo‚ both merchants‚ had conducted business and trade in Constantinopole (now known as Istanbul) and the Crimea. However‚ when Genoa’s merchants‚ rivals to the Italian Polo’s‚ took over trade in
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metal is lead‚ still one of the world’s most useful substances‚ and one that never ceases to find a role in human society. Lead has the atomic symbol of Pb (for plumbum‚ lead in Latin). The atomic number for lead is 82 and the atomic mass is 207.19 AMU. It melts at about 327.502 oC and boils at 1740 oC. Lead is a heavy‚ ductile‚ soft‚ gray solid. It is soluble in nitric acid and insoluble in water. It is found in North‚ Central and South America‚ Australia‚ Africa and Europe. In modern times‚ lead
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Grade 11 Physics Study Guide SPH3U1 Unit 1: Kinematics + Intro How to count significant figures: -Embedded 0’s count (i.e. 101 has 3 sig figs) -Any numbers that aren’t zeros count (i.e. 5263 has 4 sig figs) -0’s after the decimal place count (i.e. 1.00 has 3 sig figs) -Trailing 0’s (i.e. 2000 has 4 sig figs) -Numbers after the first non-zero (i.e. 0.0002102 has 4 sig figs) How to add and subtract numbers with proper sig figs: The result will have the least amount of numbers after the decimal
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JEET SCIENCE ACADEMY CHOWK AZAM (LAYYAH) TIME 2.5 Hr CHEMISTRY 1st YEAR CH # 1‚2‚9‚10 Marks: 85 G.Super . 1 Name…………………………………………...... Objective ROLL NO. ………………………………. Q.NO.1. Encircle the correct answer? (1×17=17) 1. Atoms of which one of the follelement have independent existance: (A) Flourine (B) Krypton (C ) Oxygen (D) Nitrogen 2.18g glucose is dissolved
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Alexander the Great Alexander‚ the child of the Macedonian ruler Philip II‚ was conceived in Pella‚ the antiquated capital of Macedonia (Macedon). His initial years were used under the tutelage of the Grek savant Aristotle. In 336 B.c.‚ Philip was killed‚ and Alexander‚ then 20 years of age‚ accepted the throne. In the wake of solidifying his tenet over the Greek states‚ he attempted‚ in 334‚ a military crusade against the Persian Empire to the east. Alexander’s armed force‚ around 35‚000 in
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1 SOME BASIC CONCEPTS OF CHEMISTRY 1 UNIT 1 SOME BASIC CONCEPTS OF CHEMISTRY After studying this unit‚ you will be able to • understand and appreciate the role of chemistry in different spheres of life; • explain the characteristics of three states of matter; • classify different substances into elements‚ compounds and mixtures; • define SI base units and list some commonly used prefixes; • use scientific notations and perform simple mathematical operations on numbers;
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is composed of diatomic molecule F2. Fluorine was discovered in 1886 by Joseph Henri Moissan‚ who also produced the first artificial diamond. The element Fluorine has nine protons and electrons and ten neutrons. Fluorines atomic mass is 188.998404 amu. Fluorines atomic number is 9. Fluorines density at 293 K is 1.696 g/cm. That makes fluorine about 1.3 times as dense as air. The electron configuration of Fluorine is [He] 2s2 2p5. Its crystal structure is cubic. To continue Fluorines name origin came
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How bills become Law 1 How bills become law POLS210 B039 AMU Laura Olson How bills become law 2 How bills become law How bills
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