Les modèles et la modélisation de la réaction acide-base dans le ...

2.2. Results and discussion
- chemical reaction and students’ school knowledge
Table 2 presents the statistical frequencies of various correct answers to the first
three questions.
Sample Q1 Q2 Students’ Frequencies of Third question Correct Reponses (Percentage, %)
Physical Phenomena Chemical Phenomena Chemical Reaction
School
Student
b d e f a c g h i a c g h i
1 28 96 89 96 96 93 93 93 57 79 57 75 14 36 21 29 4
2 25 80 72 96 100 96 76 84 44 64 48 76 24 32 0 4 0
3 26 73 89 92 100 100 46 85 46 42 46 65 8 8 8 0 12
4 23 96 96 96 100 87 100 87 83 57 57 78 22 0 13 0 26
5 28 100 93 96 100 89 82 96 46 43 54 64 29 4 11 0 7
6 31 84 77 97 100 94 94 77 61 55 39 90 13 3 0 0 0
7 24 88 92 96 100 96 92 79 50 67 46 92 33 8 8 4 4
8 19 95 95 95 95 74 95 100 63 90 63 90 16 5 5 0 5
9 16 94 94 94 100 100 94 88 69 94 75 100 13 12 6 0 13
10 20 85 90 100 75 95 90 90 45 55 55 95 5 15 10 10 0
240 89.1 88.7 95.8 96.6 92.4 86.2 87.9 56.4 64.6 54 82.5 17.7 12.5 8.2 4.7 7.1
Table2. Frequencies of the correct students answers produced to the questionnaire
(decimal fraction made round)
Caption:
The letters a, b, c, d, e, f, g, h, i correspond to 9 phenomena which pupils had to
distinguish.
Q1 Frequencies of correct students first question responses (Percentage, %)
Q2 Frequencies of correct students second question responses (Percentage, %)
Question 1
The table 2 results show us that student frequencies lies in the range 73 to 100
percents. Most of classes are largely over 80% values. The mean value and the
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