Misconceptions in the Chemistry Laboratory
In this workshop, various misconceptions in the chemistry laboratory are discussed, ranging from digital measurements to the correlation between lab and lecture. The images provided shed light on common issues faced by students and instructors, emphasizing the importance of accurate measurements, understanding lab procedures, and the role of instructors in guiding students through experiments. The workshop also touches upon the lack of confidence in making observations and the varying emphasis placed on labs in educational settings.
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Presentation Transcript
10th Harris Teaching Workshop May 24th, 2012 Erika Smith Norman Gee Amira Elyazbe Frances Sutherland Ross Witherell Wayne Lippa Lydia Chen Lucio Gelmini Misconceptions in the Chemistry Laboratory 1
TAKING MEASUREMENTS Digital measurement - no error! Glassware markings 100% exact ibal-601scrn275 ANd9GcQg5M5YDniXORVdJqhrcJIsOQvzmRc4UhVwPIgXKWUNrE_c-_m9zrd5qg 2
THAT WHAT IT SAID Always need exact amounts Got to start at zero ibal-601scrn275 ANd9GcQg5M5YDniXORVdJqhrcJIsOQvzmRc4UhVwPIgXKWUNrE_c-_m9zrd5qg 3
LABS IN GENERAL Nothing works even though I followed the procedures. Because the instrument says this , results has to be right . (Not sure why there is a difference between my result and theory) Science labs have no error-should be able to get right answer 4
CORRELATION OF LAB & LECTURE Can t do lab unless material covered in lecture Chicken_or_Egg Labs are completely separate from lecture. Don t need previous knowledge to do lab. 5
INSTRUCTORS & STUDENTS Students are expecting the instructor to do all the background information. Each lab is separate from the next so I don t have to remember what I did before. Instructor is there to help! You don t have to be prepared to do the lab Ok to copy (we should get same result) ANd9GcTGIlwaq9qUFPWZHjYmxVp4AWg1njc6k3DFlZaI00c00mT-ic0pfarPYl0 6
Does this look blue to you? Students often lack the confidence to make their own observation! TA will tell me. ANd9GcTsEYCusCJwNgaRqhmMdbVtPgS_YPFdLHx7KEVbooexunvvBBCfb47OLA Diverse background. -wrongly assume same background of students Did hands on experiments All demos 7
LAB EMPHASIS Not many marks associated with labs -not very important Some schools require a pass for both lecture and lab portion? ANd9GcQndc_04O0qNuEUNAAK7QNa3oqmpfouanQX8sNk_MJ9XreGKKk4u9xN8g 8
REAL WORLD No application to what happens in real world There is always a right answer Wrong answers don t tell us anything Answer does not always need to make sense it s an experiment 9
WHATS IN A NUMBER? Infinite sig figs (my calculator made me do it) If I did it again, I d get the exact same result 10
