Mass Percent & Empirical and Molecular Formulas Unit 2 Lecture 3 Mass Percent The percentage by mass of an element in a compound or a component in a substance Mass % element = (# of atoms) (element’s atomic mass) x100 formula weight of compound Mass % component= ( mass of component ) x100 total mass of substance A component could be a compound or an element in a substance or mixture (for example‚ water in a hydrate). Example 1: 1. What is the mass percent of each element in Ilmenite (FeTiO3)
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Humans should consider every possibility that science makes in order for it to happen and work properly in the society. One is human cloning. But first let’s define cloning. Cloning is the artificial process of making a genetic twin of a person or an animal. In short‚ you replicate the genes of a being in order to create another being of the same kind. And you know Dolly‚ the sheep? Dolly was the first animal to be cloned. And since her birth‚ the idea of human cloning has been given emphasis. People
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Chemistry102 5/7/2013 Lecture Presentation Chapter 17 Additional Aspects of Aqueous Equilibria John D. Bookstaver St. Charles Community College Cottleville‚ MO © 2012 Pearson Education‚ Inc. Common Ion Effect HA(aq) + H2O(l) ⇔ A−(aq) + H3O+(aq) • Adding a salt containing the anion NaA‚ which • is the conjugate base of the acid (the common ion)‚ shifts the position of equilibrium to the left This causes the pH to be higher than the pH of the acid solution 9lowering the H3O+ ion concentration
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course are too numerous to be listed here. The course goes hand in hand with General Chemistry lecture course‚ which covers the following topics: 1. CHEMISTS AND CHEMISTRY. 2. ATOMS‚ MOLECULES AND IONS. 3. STOICHIOMETRY. 4. TYPES OF CHEMICAL REACTIONS AND SOLUTION STOICHIOMETRY. 5. GASES. 6. ENERGY‚ ENTHALPY‚ AND THERMOCHEMISTRY. 7. QUANTUM MECHANICS AND ATOMIC THEORY. 8. BONDING: GENERAL CONCEPTS.
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Unit 4: Basic Stoichiometry Rocky Mountain Poison and Drug Center Case Study DUE _________________________________ at Midnight All Sections are a level 3 Title and Date Is it present Identifies the independent and dependent variables. Describes the independent and dependent variables. Problem (level 3) Complete sentence (if a problem‚ in question form) Identifies the independent and dependent variables. Describes the independent and dependent variables. Case
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Introduction to Chemistry Laboratory: A Lesson on Tools‚ Techniques and Measurements PURPOSE: The purpose of this set of experiments (3 total) is to become familiar with the common types of laboratory glassware and equipment‚ and how to obtain and analyze data from these items. LEARNING OBJECTIVES: By the end of this experiment‚ the student should be able to demonstrate the following proficiencies: 1. Know which glassware (beakers‚ burettes‚ pipettes‚ graduated cylinders‚ flasks‚ etc) should
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Single Replacement -these can be cationic or anionic. i.e. Cationic: A+BC-->AC+B Anionic: A+BC-->AB+C B) Double Replacement -AB+CD-->AD+CB C) Composition/Synthesis -A+B-->AB D) Combustion -C(x)+H(y)+O(2)-->CO(2)+H(2)O Part III: Stoichiometry A) All conversions using the mole‚ including GFM. -Mole (Avogadro’s #) = 6.02 x 10^23 QUANTITY MOLE MASS GFM: Number on periodic table. B) Conversions using 1 mole = 22.4L (self explanatory) C) Conversions i.e. 2Bread + 3PeanutButter
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Chapter 13: EDTA titrations Complexation Reaction: A reaction between two species having a well-defined stoichiometry. The resulting bond is not permanent from a covalent standpoint. Complex: The resulting structure formed during a complexation reaction. Coordination Center: Metal ion in a complex (Lewis acid) Ligand: The species that complexes the metal center. A single species can form one or more bonds with a single coordination center (Lewis base) Coordination Number: Number of ligand bonds
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05.09 Module Five Review and DBA 05.01 Four Phases of Matter * Matter exists in different phases‚ also called states‚ which include solid‚liquid‚ gas‚ and plasma. These phases can be distinguished at the molecular level by how the particles are held together. * Solids * In the solid phase‚ the intermolecular attraction between particles of matter is strong enough to hold all the particles together in a fixed three-dimensional arrangement. Because of the rigid arrangement of particles
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CHEM7113 - Atomic Spectroscopy ! !! Analytical Techniques "! Absorption (AAS) "! Flame AAS "! Vapour generation AAS furnace (electrothermal) AAS "! Graphite "! Emission (AES) "! ICP-AES "! AFS (atomic fluorescence) Some diagrams and Tables are reproduced from Skoog ‘Principles of Instrumental Analysis’‚ 5th/6th ed. 1 ! Atomic Spectroscopy ! !! Electronic transitions : UV - visible radiation excitation of outer-shell electrons of atoms in the gas phase energy
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