1-7 quizes Ochem 237 Lab - 507

1-7 quizes Ochem 237 Lab - 507 - Name: Lab Color: T A Name:...

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Quiz IB \i V{v Name: Chemistry 237 Lab Color: \1,e ct It~ Prepared By: Fall 2009 TA Name: A\Q ~ Hong-Li Sheu 25 points total Multiple Choice: 3 points each. TruelFalse: 1 point each. Choose the best answer(s) for each question. 1. Whis.~.9f the following statements is true for melting point determination? ~ ..f2J melting point is the temperature at which the compound has completely melted / IY. th~ melting point capillary has two open ends ~ ionic compounds usually have higher melting points C;) none of the above 2. Which of the following statements is true for TLC? a. TLC is always the best way to compare chemical compounds b. spots on most TLC plates can be seen by visible light C, the developing solvent must cover the starting point ( .DTLC data is reported in terms of retention factors 3, Which of the following ste~ded in a melting point determination in this experiment? pack two melting point capillaries r ~ wet these two capillaries c. use the first capillary tube to determine the rough melting range d, use the second capillary tube to determine the precise melting point range 4. Which of the following steps is not include~ in TLC in this experiment? prepare 50/50 mixture of ethyl acetatelhexane for developing solvent ~ dissolve sample in dichloromethane c. spot sample on TLC plate d. calculate retention factors 5, Which of the following statements is not true regarding safety in the lab? chemical data sheets are required for all chemicals used in the workplace including liquid soap (b. Latex gloves are appropriate for use with many, but not all, organic chemicals The goggles that you wear in lab must be enclosing and have splash guards attached @ All of the above 6. Which method is not used to determine the identity of the co~ounds in this experiment? melting point determination c.y solubility in HCl b, TLC mixture melting point 7. Which of the following is the H-C-H angle in methane (ClL)? 1W~~ OO~~ ,V 109 degree 120 degree . £:=\ 8. True or ~ TLC jars need to be rinsed with wateL 9, orrFa ~ Retentton factor is the distance traveled by sample on TLC plate. 10( Tru or False. An sp hybrided carbon will a bond angle of 180 0 11. 3'C} or f~ The capillary tube for spotting a TLC plate has only one open end. ~
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_UIZ Name: '\iQX\ \'-\Dt\AMeJ(\J ~ g Chemistry 237 Lab Color: Red ~ , Prepared By: Fall 2009 T A Name: At e'/. Tyler Hood 25 points total Multiple Choice: 3 points each. TruelFalse: 1 point each. Choose the best answer(s) for each question. 1. What will you use to heat the water in the recrystallization lab? a. hot plate @ steam bath (" b. Bunsen burner d. heating mantle 2. The hot filtered solution should be treated in what manner to recrystallize the purified acetanilide in order to filter and obtain the crystals? ( placed immediately in an ice bath cooled to room temperature @ cooled to room temperature and then placed in an ice bath not cooled at all 3.
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1-7 quizes Ochem 237 Lab - 507 - Name: Lab Color: T A Name:...

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