Hello. I'd like to add a radio or a drop-down input... I define the variables like so:
n1: Al2O3;
n2: MgSO4;
n3: MgCO3;
n4: SiO2;
ta3: n1,true],[n2,false],[n3,false],[n4,false;
ta3: random_permutation(ta3);
I set the input type to drop down list, model answer to ta3; answer test to algequiv, SAns: ans3 and the TAns: Al2O3. When the student chooses the correct answer, the evaluation says it's not correct. Please, can anyone tell me what's the problem? Thank you.
Hello Armand,
I checked this part of question and found that the problem is related to this issue https://github.com/maths/moodle-qtype_stack/issues/652 .
STACK questions can not handle chemical formulas - it understands them as complex "variable names", like Al2O3.
What works, is for example, is Al2 instead of Al2O3...but this is not valid "chemical formula" variable,
I would reformulate this question part so that it handles onlz simple variables.
In the question text present references - as simple variables f1,f2,f3,f4 - to proper chemical formulas: f1: Al2O3; f2: MgSO4;f3: MgCO3;f4: SiO2.
In question's variable part, have : "ta2: f1,true],[f2,false],[f3,false],[f4,false; ta2: random_permutation(ta2)". So, you will ask for the reference to the formula, what is doable in STACK.
Hi,
you can also use the optional display part of the multiple choice question to place your formulas in the radio button question as strings directly.
n1: "\\(\\ \\mathrm{Al_2O_3}\\)"; n2: "\\(\\ \\mathrm{MgSO_4}\\)"; n3: "\\(\\ \\mathrm{MgCO_3}\\)"; n4: "\\(\\ \\mathrm{SiO_2}\\)"; ta3: [ [a,true,n1],[b,false,n2],[c,false,n3],[d,false,n4] ]; ta3: random_permutation(ta3);
In this case you would check for a in the prt.
Stephan
Hi,
apparently there was a problem with the variable names of the radio button options. Changing them to a1, b1, ... should be enough (At least this worked on our Moodle). And I would suggest to use RadioButton instead of DropDown.
Stephan
Hello,
I am attaching printscreen - these chemical formulas are nicely printed in LaTeX notation (even there is some LaTeX stuff for chemistry we should explore), but still gives wrong answer...
Dear Chris,
this is fine - we, chemists, deeply appreciate your diligent work on STACK type of questions, which we started to utilize in all kind of chemical calculations (like chemical calculus, physical chemistry...).
Concerning chemical formulae - this is only secondary issue; as we found, we can display them in questions as mere text in LaTeX notation, even enhanced by the mhchem extension. This is sufficient.
I think there is no need to invest time into chemical formulas in STACK. Just keep STACK in line of its purpose - assess mathematics.
All the best.
