Chem 106: Class/ Lab #9 Week 10 Sign in: front of lab

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Presentation transcript:

Chem 106: Class/ Lab #9 Week 10 Sign in: Roster @ front of lab For today’s experiment Work with the lab partner who set up fermentation with you

Chemical Reactions (Course/ Lab Manual pp. 49-51) Chem 106: Class/ Lab #9 Week 10 Turn in Today Chemical Reactions (Course/ Lab Manual pp. 49-51) Reactions, Balancing, Stoichiometry Worksheet (Course/ Lab Manual pp. 65-67) Have stamped before leaving lab: Distillation (Course/ Lab Manual pg. 46)

Chem 106: Class/ Lab #9 Week 10 Due Next Week Completed Fermentation Report form (Course/ Lab Manual pg. 46) Fermentation Post Lab Ques. [Handout: Individually done]

Chem 106: Class/ Lab #9 Week 10 Today’s experiment; Completion of Chemical Reactions/ Fermentation/ Distillation Due & stamped Today Distillation (Course/ Lab Manual pg. 46)

Distillation Oil Refining: http://chemconnections.org/general/movies/html-swf/oil-refining.swf Oil Refining: http://science.howstuffworks.com/oil-refining4.htm

Energy Diagrams

Energy Diagrams

https://www.youtube.com/watch?v=rdCsbZf1_Ng

Kinetics: How fast is a reaction?

Chem 106: Class/ Lab #9 Week 10 Have stamped before leaving lab: Distillation (Course/ Lab Manual pg. 46) Turn in Next Week Distillation (Course/ Lab Manual pg. 46) Fermentation Post Lab Ques. [Handout: Individually done] http://chemconnections.org/general/chem120/ethanol-ques-106.html

Calculations Distillation (Course/ Lab Manual pg. 46)

Example 24.55 g 52.2 mL 0.990 g/mL

? g (theoretical) = mol C2H5OH x 46.07 g/mol = 13.22 g Molar mass = 342.3 g/mol Molar mass = 46.07 g/mol ? mol C2H5OH = 4 x mol sucrose = 0.2869 mol ? mol sucrose = 24.55 g / 342.3 g/mol = 0.07172 mol ? g (theoretical) = mol C2H5OH x 46.07 g/mol = 13.22 g __________________ ? g (actual) = [%5,that is:] 5/100 x 52.2 mL x 0.990 g/mL = 2.58 g % Yield = g (actual) / g (theoretical) x 100 = 19.5 %

Chem 106: Class/ Lab #10 Week 11 Substitute Professor Claudia Hein Refer to Course Calendar Substitute Professor Claudia Hein Work with your lab partner Titration of Vinegar Quantitative Acid-Base Reaction (Neutralization) Using a standard NaOH aqueous solution Determining the % Acetic Acid in store bought vinegar samples Have data checked before leaving lab

Refer to the Course Calendar Chem 106: Class/ Lab #11 Week 12 Exam 2 Refer to the Course Calendar Fluid Exchange/ Acids-Bases Experiment first part of lab last 90 minutes of lab: Exam 2 2 pages handwritten notes, which are to be turned in, plus Periodic Table allowed