L01S08 Stoichiometry - Chem 1A, L1: "Atoms, Molecules,

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Unformatted text preview: Chem 1A, L1: "Atoms, Molecules, Stoichiometry" Heino Nitsche https://bspace.berkeley.edu/portal https://bspace.berkeley.edu/portal Lab Instructor/Lecturer : Dr.Christina Stuart, 323 Latimer Hall Stuart, Enrollment: Dr. Robert Lamoreaux, 211 Latimer Lamoreaux, Demo Supervisor: Lonnie Martin Head TA: Amber Wise 2008 Pines,Kubinec,Nitsche, UCB L1-1 Welcome to Chem1A Office Hours Prof. Nitsche Wednesday 4-5 and Friday 3-4 p.m. 43Location: 446 Latimer Hall Weekly Review Sessions Thursday 5-6 p.m. 5120 Stanley Hall 2008 Pines,Kubinec,Nitsche, UCB Amber Wise L1-2 ChemQuiz 1.0 How many years of chemistry did you have in high school? A) 0 B) 0.5 C) 1 D) 2 or more 2008 Pines,Kubinec,Nitsche, UCB L1-3 2006 A.Pines, M.Kubinec, H. Nitsche UCB 1 Chem 1A, L1: "Atoms, Molecules, Stoichiometry" ChemQuiz 1.1 Do you plan to go to Medical School A) Absolutely B) Undecided C) No 2008 Pines,Kubinec,Nitsche, UCB L1-4 Lab 1: Airbags Goal: Design a reaction using acetic acid and sodium bicarbonate that will evolve the largest amount of CO2 gas to inflate a plastic bag Tools such as stoichiometry, molar mass stoichiometry, and balancing chemical equations are necessary to help you predict what will optimize your airbag Bonus points to the teams that develop 2008 three largest bags the Pines,Kubinec,Nitsche, UCB L1-5 Summary 2H2 Energy Reactants + Chemical Reactions O2 2H2O High Road (barrier) Products Reaction Coordinate 2001 UC Regents L1-4 Relative Atomic and Molecular Mass H 1.01 12C 2H2 + O2 2H2O Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 12.00 C 12.01 O 16.00 2 molecules + 1 molecule 2 moles + 1 mole 2 grams + 16 grams 2 molecules 2 moles 18 grams 2006 A.Pines, M.Kubinec, H. Nitsche UCB 2 Chem 1A, L1: "Atoms, Molecules, Stoichiometry" Chemical Reactions 2H2 Energy Reactants Products Reaction Coordinate 2008 Pines,Kubinec,Nitsche, UCB + O2 2H2O Transition State High Road (barrier) (barrier) L1-7 Scanning Probe Microscopy Can Image Single Atoms Image of a ring of cobalt atoms placed on a copper surface An Scanning Tunneling Microscopy (STM) image of nickel atoms placed on a copper surface. 2008 Pines,Kubinec,Nitsche, UCB L1-8 Stoichiometry Relationships between quantities of matter that participate in chemical reactions. Macroscopic Bulk matter NA Microscopic Atoms, Molecules Avogadro's Number: NA = 6.022 x 1023 Avogadro' NA atoms in 12.00 g 12C= one Mole Molar Mass (g/mol) 2008 Pines,Kubinec,Nitsche, UCB L1-9 2006 A.Pines, M.Kubinec, H. Nitsche UCB 3 Chem 1A, L1: "Atoms, Molecules, Stoichiometry" is assigned exactly 12 atomic mass units (amu or u) Masses of all other atoms are given relative to this standard Atomic masses are averages of isotopic masses Relation between amu and grams (6.022 x 1023 atoms) (12amu/atom) = 12 g 6.022 x 1023 amu = 1 g 1 amu = 1.661 x 10-24 g = 1.661 x 10-27 kg 2008 Pines,Kubinec,Nitsche, UCB 12C Atomic Mass and Mass Units L1-10 Relative Atomic and Molecular Mass H 1.01 12C Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 L1-11 12.00 C 12.01 O 16.00 2008 Pines,Kubinec,Nitsche, UCB ChemQuiz 1.2 What mass (g) of methane is required to react completely with 4 g of oxygen as shown? CH4 + 2 O2 CO2 + 2 H2O Relative masses: O2 = 2 x CH4 1) ~1 2008 Pines,Kubinec,Nitsche, UCB 2) ~2 3) ~4 g L1-12 2006 A.Pines, M.Kubinec, H. Nitsche UCB 4 Chem 1A, L1: "Atoms, Molecules, Stoichiometry" Molecules, Moles, Mass 2H2 + O2 2H2O 2 molecules + 1 molecule 2 moles + 1 mole 2 grams + 16 grams 2008 Pines,Kubinec,Nitsche, UCB 2 molecules 2 moles 18 grams L1-14 Stoichiometry Relationships between quantities of matter that participate in chemical reactions. 2H2 Energy + O2 2H2O Transition State High Road (barrier) Low Road (catalyst) Reactants Products Reaction Coordinate 2008 Pines,Kubinec,Nitsche, UCB L1-15 ChemQuiz 1.3 2H2 + O2 2H2O After the reaction of 1 mole H2 and 2 moles O2 is completed, which compound has the greatest number of moles? 1) H2 2008 Pines,Kubinec,Nitsche, UCB 2) O2 3) H2O L1-16 2006 A.Pines, M.Kubinec, H. Nitsche UCB 5 Chem 1A, L1: "Atoms, Molecules, Stoichiometry" ChemQuiz 1.4 2 moles of an oxide of hydrogen release 1 mole oxygen, leaving pure water. oxygen, water. Which is the oxide? 1) HO 2008 Pines,Kubinec,Nitsche, UCB 2) H2O2 3) H2O3 L1-18 Lecture Complete 2008 Pines,Kubinec,Nitsche, UCB L1-20 2006 A.Pines, M.Kubinec, H. Nitsche UCB 6 ...
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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