Doug, Could you make the question a <reactionresponse> with the reaction pre-loaded? The students will only have to insert the coefficients.
Bob Gonzales Binghamton University Chemistry Dept On Thu, Nov 10, 2016 at 2:42 PM, Mills, Douglas G <dmi...@illinois.edu> wrote: > Thanks Ray. That's an interesting twist putting in zeros! > > > > For now what I'm doing sounds a bit similar to your solution of having > undesirable components disappear. Pending a possible(?) preprocessing > solution, I'm using JavaScript to insert exponents or co-efficients of 1 > where the students have chosen to leave the blank when the problem is > submitted and then remove them again as the page reloads. Once the student > has the answer correct, I'm hiding the exponents or coefficients that are > equal to one from the correct answer. This seems to work in my testing -- > we'll turn it loose for a horde of students to work with next week and see > how it stands up to that. > > > > Great to hear from you, Ray! > > > > Doug > > > > Douglas Mills > > Director of Instructional Technology > > Department of Chemistry > > University of Illinois > > > > > > *From: *<lon-capa-users-boun...@mail.lon-capa.org> on behalf of Raymond > Batchelor <batch...@sfu.ca> > *Reply-To: *"batch...@sfu.ca" <batch...@sfu.ca>, Discussion list for > LON-CAPA users <lon-capa-users@mail.lon-capa.org> > *Date: *Thursday, November 10, 2016 at 12:19 PM > *To: *Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org > > > *Subject: *Re: [LON-CAPA-users] Making something out of nothing with > preprocessing? > > > > > > > ------------------------------ > > *From: *"Douglas G Mills" <dmi...@illinois.edu> > *To: *lon-capa-users@mail.lon-capa.org > *Cc: *"Douglas G Mills" <dmi...@illinois.edu> > *Sent: *Wednesday, 9 November, 2016 11:45:55 > *Subject: *[LON-CAPA-users] Making something out of nothing with > preprocessing? > > Hi Doug, > > Similarly the coefficent could be "0" (H2O, H+, or OH- for example -- > when you want them to decide on which side the equation those would or > would not appear). > > > > Several years back, I made resources where students were still required to > enter "0" or "1" coeffs, when appropriate. > > However, I put in conditions that hide the affected parts of the equation > so that, once they have answered the question correctly, some species no > longer appear and coeffients of "1" have been removed. > > Not quite a solution but, this has worked fine for several years. There > remains the issue that, once they have it correct, grader can no longer > locate or view the suppressed species nor the "0" and "1" coefficients as > entered by the student. > > > > lol > > > > Ray > > > > > > Hi All, > > > > There are times, such as filling in coefficients to balance a chemical > equation, when the best answer would be no answer at all. Requiring > students to put 1 as the coefficient of O2 in the reaction > > > > "2H2 + O2 -> 2H2O" > > > > when they are presented with [numericalresponse]H2 + [numericalresponse]O2 > -> [numericalresponse]H2O because if they don't Lon-Capa will not process > the answer because "not all answers were submitted" is an artificial > concession to the LMS that I'd like to avoid. I had thought maybe with > preprocessing I could instruct students to leave a text field blank -- as > such an equation would normally be written -- when the coefficient is 1 and > then preprocess and insert a 1 for the case where the textfield is empty so > that Lon-Capa is getting an answer without the artificial exercise of the > student putting in a coefficient of 1, but that does not seem to be > working. Should that be possible and I'm just going about it the wrong > way? Any other ideas on how to address this besides instructing students > to give 1 as the answer? > > > > Thanks! > > > > Doug > > > > Douglas Mills > > Director of Instructional Technology > > Department of Chemistry > > University of Illinois > > > > > _______________________________________________ > LON-CAPA-users mailing list > LON-CAPA-users@mail.lon-capa.org > http://mail.lon-capa.org/mailman/listinfo/lon-capa-users > > > > > > -- > > Raymond J. Batchelor, PhD. > Department of Chemistry > Simon Fraser University > > > > Phone: 778-782-5635 > > _______________________________________________ > LON-CAPA-users mailing list > LON-CAPA-users@mail.lon-capa.org > http://mail.lon-capa.org/mailman/listinfo/lon-capa-users > >
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