[LON-CAPA-users] Making something out of nothing with preprocessing?

Bob Gonzales rgonzal at binghamton.edu
Fri Nov 11 09:05:40 EST 2016


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 <dmills at 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-bounces at mail.lon-capa.org> on behalf of Raymond
> Batchelor <batchelo at sfu.ca>
> *Reply-To: *"batchelo at sfu.ca" <batchelo at sfu.ca>, Discussion list for
> LON-CAPA users <lon-capa-users at mail.lon-capa.org>
> *Date: *Thursday, November 10, 2016 at 12:19 PM
> *To: *Discussion list for LON-CAPA users <lon-capa-users at mail.lon-capa.org
> >
> *Subject: *Re: [LON-CAPA-users] Making something out of nothing with
> preprocessing?
>
>
>
>
>
>
> ------------------------------
>
> *From: *"Douglas G Mills" <dmills at illinois.edu>
> *To: *lon-capa-users at mail.lon-capa.org
> *Cc: *"Douglas G Mills" <dmills at 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
>
>
>
>
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>
>
>
>
>
> --
>
> Raymond J. Batchelor, PhD.
> Department of Chemistry
> Simon Fraser University
>
>
>
> Phone: 778-782-5635
>
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>
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