Methodical aspects evaluating complexity of school calculative chemistry tasks
The article is devoted to the method of graph modeling to evaluate complexity of school calculative chemistry tasks. We suppose that this method can be an instrument of school standard calculative chemistry tasks systematization. We use the first grade complex graphs to build up the structure to solve calculative chemistry tasks. These graphs model the following basic relations between the structure elements of the task: dependence (c = a × в); summation (а = а1 + a2); subtraction (а = а1 - а2); division (a/b = a : b). The complexity of the “tree” task consists of the sum of the tops complexity indexes. The complexity index of every top is the composition of the quantity of the ribs of the top and the quantity of the bottom ribs, including that very top for which we calculate the complexity. The graph models of 9 chemistry reaction tasks solving are built: (aA + eE = вB + dD):1. νB for νA; 2. νB for mА; 3. νB for VА°; 4. mВ for νA; 5. mВ for mА; 6. mВ for VА°; 7. VВ° for νA; 8. VВ° for mА; 9. VВ° for VА°. The complexity of these tasks solving structures is calculated. We also show the possibility of the calculative chemistry tasks solving modeling. The estimation of their complexity allows systematizing them for the optimal projecting of school standard calculative chemistry tasks structure.