CHE_106_Lecture7_2009

CHE_106_Lecture7_200 - Chemistry 106 Lecture 7 Topics Mass and Moles Chapter 3.3 3.5 Exam Reminder The First Exam will be held on October 1(during

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Chemistry 106 Lecture 7 Topics: Mass and Moles Chapter 3.3 - 3.5
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Exam Reminder The First Exam will be held on October 1 (during normal class time, 3:30 – 4:50 PM). Exam #1 will cover Chapters 1 through 3. All exams will be multiple choice. Practice exams are posted on blackboard.syr.edu. If you have any special needs or issues (such as sports) you must inform me in writing as soon as possible ( Before September 24 ).
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Stoichiometry: Quantitative Relations in Chemical Reactions Stoichiometry is the calculation of the quantities of reactants and products involved in a chemical reaction. It is based on balanced chemical equations and on the relationship between mass and moles . Such calculations are fundamental to most quantitative work in chemistry.
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Chemical Reactions: Equations A chemical equation is the symbolic representation of a chemical reaction in terms of chemical formulas. For example, the reaction of sodium and chlorine to produce sodium chloride is written: aCl l a The reactants are starting substances in a chemical reaction. The arrow means “ yields ”. The formulas on the right side of the arrow represent the products . NaCl 2 Cl Na 2 2 +
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Mass and Moles of a Substance In order to use these balanced equations, we need to relate molecules and mass. Chemistry requires a method for determining the numbers of molecules in a given mass of a substance . This allows the chemist to carry out “recipes” for compounds based on the relative numbers of atoms involved. These calculations are called stoichiometry .
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Molecular Weight The molecular weight of a substance is the sum of the atomic weights of all the atoms in a molecule of the substance. For, example, a molecule of H 2 O contains 2 hydrogen oms (at 1.0 mu ach) and 1 oxygen atom (16.0 atoms (at 1.0 amu each) and 1 oxygen atom (16.0 amu), giving a molecular weight of 18.0 amu.
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Formula Weight The formula weight of a substance is the sum of the atomic weights of all the atoms in one formula unit of the compound, whether molecular or not. For example, one formula unit of NaCl contains 1 dium atom (22.99 mu and 1 chlorine atom sodium atom (22.99 amu) and 1 chlorine atom (35.45 amu), giving a formula weight of 58.44 amu.
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Calculating the Formula Weight Calculate (with 4 significant digits) the formula weight of glucose (C 6 H 12 O 6 ). FW = (6 x AW of C) + (12 x AW of H) + (6 x AW of O)
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This note was uploaded on 02/09/2010 for the course CHE CHE 106 taught by Professor Korter during the Fall '09 term at Syracuse.

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CHE_106_Lecture7_200 - Chemistry 106 Lecture 7 Topics Mass and Moles Chapter 3.3 3.5 Exam Reminder The First Exam will be held on October 1(during

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