探討教-學序列對八年級學生建立電解質概念及心智模式的影響

劉秀娟(Shiu-Chung Lau)

指導教授 ： 邱美虹博士

國立臺灣師範大學/理學院/科學教育研究所在職進修碩士班/碩士(2006年)

摘要

摘要
「電解質」是化學教材中相當重要的單元之一，從中小學乃至於大學有關化學的課程，該相關概念皆佔有相當重要的地位。而且「電解質」概念可說是後續進行酸鹼中和、電化學電池、電流的化學效應等相關電化學概念的基礎。但是學生在經過學習後卻仍存在有微觀的迷思概念。因此本研究希望設計一份試題協助教師進行診斷，了解學生在「電解質」概念上的迷思概念；並利用TLS（教-學序列）的設計原則設計一份針對學生迷思概念的教材。
依據上述的目的，本研究的問題有：（一）TLS是否可以幫助學生學習電解質概念？（二）TLS對學生學習電解質的心智模式的改變？因此本研究選取「解離」、「電中性」、「導電的原因」及「離子的運動情形」四個教學主題，並隨機選取兩班八年級學生作為對照組與TLS實驗組進行教學研究。
本研究的結果如下：
1.就學習的成效：兩組在教學前的前測成績並無顯著差異，經過教學後，在後測
及延宕測驗的成績上，TLS實驗組皆優於對照組，並且有顯著差異。
2.就概念的學習及電解質的心智模式一致性而言：
（1）電解質導電的微觀解釋：後測中實驗組有82％的學生持有離子的心智模
式，對照組有48％的學生持有離子的心智模式。延宕測驗中實驗組有78
％的學生持有離子的心智模式，對照組有52％的學生持有離子的心智模
式。
（2）電中性概念：後測中實驗組有59％的學生持有總電量的心智模式，對照組
中有48％的學生持有總電量的心智模式。延宕測驗中實驗組有67％的學生
持有總電量的心智模式，對照組中有49％的學生持有總電量的心智模式。
（3）通電前後粒子移動的概念：通電前粒子移動方向的概念部份，後測中實
驗組有83.9％的學生持有隨機運動的心智模式，對照組中有70.6％的學生持
有隨機運動的心智模式。延宕測驗中實驗組有74.2％的學生持有隨機運動的
心智模式，對照組中有67.6％的學生持有隨機運動的心智模式。通電後粒子
移動方向的概念部份，後測中實驗組有93.5％的學生持有正離子移向負極的
心智模式，對照組中有76.5％的學生持有正離子移向負極的心智模式。延宕
測驗中實驗組有93.5％的學生持有正離子移向負極的心智模式，對照組中有
79.4％的學生持有正離子移向負極的心智模式。
（4）.電解質部分解離的概念：後測中實驗組有59.4％的學生持有部分解離且
離子比分子多的心智模式，對照組有45.5％的學生持有部分解離且離子比
分子多的心智模式。延宕測驗中實驗組有46.9％的學生持有部分解離且離
子比分子多的心智模式，對照組有43.8％的學生持有部分解離且離子比分
子多的心智模式。
3.就情意面向而言：TLS實驗組學生認為此次的教學可以幫助理解且較有趣，對本次教學所抱持的態度是正向的。
綜合以上所述，本研究實驗組所使用的TLS教學策略似乎可以幫助學生建立較佳的「電解質」心智模式。

關鍵字

教-學序列 ； 心智模式 ； 電解質

並列摘要

Abstract
The concept of electrolyte has played an important role in learning chemistry, from the elementary and middle schools and even to the university. Moreover, the "electrolyte" concept is a basic concept of the acids, bases, and salt and electro- chemical cell, electric current. But students actually still existed misconceptions after the process of study.
This research hopes to designs a test question to help the teacher to understand the students’ misconceptions in "electrolyte" and use the designing principle of TLS (teaching- learning sequence) to designs teaching material which focuses on students’ misconceptions.
According to the purpose mentioned above, the research questions were as follows. First, could TLS help student learn the electrolyte or not? Second, how students' mental models changes after instruction?
Therefore this research selection "the dissociation", "the electricity neutrality", "the reason of electric conduction " and "the ion movement situation" four teaching subjects, and stochastically select two class of students conduct the teaching research as the control group and the TLS experiment group.
This research result as follows:
1. On study result: as for concept learning, TLS group performed better than the other group.
2. The mental model of electrolyte:
(1) Electrolyte electric conduction microscopic explanation that：In past tests showed 82% TLS group students' major mental model were “atom”, the control group were 48% s. In delays test showed 78% TLS group students ' major mental model were “atom”, the control group were 52% .
(2) Electricity neutral concept: In past tests showed 59% TLS group students ' major mental model were “total electric quantity”, the control group were 48% s. In delays test showed 67% TLS group students ' major mental model were “total electric quantity”, the control group were 49% .
(3) the atoms' movement: In past tests showed 83.9% TLS group students' major mental model were “random motion”, the control group were 70.6% s. In delays test showed 74.2% TLS group students ' major mental model were “random motion”, the control group were 67.6% . In past tests showed 93.5% TLS group students ' major mental model were “the cation move to the cathode”, the control group were 76.5% s. In delays test showed 93.5% TLS group students ' major mental model were “the cation move to the cathode”, the control group were 73.4% .
(4) Electrolyte partial dissociation concept: In past tests showed 59.4% TLS group students' major mental model were “partial dissociation”, the control group were 45.5% s. In delays test showed 46.9% TLS group students' major mental model were “partial dissociation”, the control group were 43.8%.
3. About learning attitude，students in TLS group thought this teaching was interesting, not too hard to understand ,and might promote the understanding. TLS group had the most positive attitude.
Above the synthesis states, this teaching strategy may help the student to establish good mental models of “electrolyte".

並列關鍵字

Mental model ； TLS

參考文獻

之影響。國立臺灣師範大學科學教育研究所。

張仁邦和蕭倍元（2000）：地球運動之電腦模擬，國教新知，46（3），58-68。

析模式探討其意涵與影響。台北市：國立臺灣師範大學科學教育研究所碩士

林靜雯與邱美虹(2005)：整合類比與多重表徵研究取向探究多重類比設計對兒童

邱美虹與林靜雯(2002)：以多重類比探究兒童電流心智模式之改變。科學教育學