高中學生應用勒沙特列原理判斷非均勻相系化學平衡的迷思概念探討

An investigation on senior high school studentds' misconceptions of applying Le chatelier's priciple under heterogeneous systems on chemical equilbrium.

李世峰(Shih-Feng Lee)

指導教授 ： 李田英

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(2001年)

摘要

摘 要
本研究探討高中學生應用勒沙特列原理判斷非均勻相系化學平衡的迷思概念。參與研究之學生為桃園市某高中高三學生332名，研究工具為研究者分析學生在開放式試題結果所得資料，設計一份涵蓋七個中心概念，總數50題的二段式測驗。試題的第一部份是檢驗學生對知識了解的正確性，第二部份則是探究學生之所以持此種認知的理由。試題內容效度經由四位具化學專業能力的高中化學教師審核評定，測驗試題的庫李信度為0.81。測驗資料分別以描述性統計及皮爾遜(pearson)積差相關分析，歸納結果發現41項有關勒沙特列原理迷思概念，其中有19項在國內外研究有類似發現，但另22項為本研究所特有。其中最顯著的重要迷思概念有：1.不論反應物種的濃度改變與否，59%的學生認為平衡前正反應速率等於平衡後正反應速率，同理平衡前逆反應速率亦等於平衡後逆反應速率；2.在鹽類溶解度平衡中，41.6%學生認為難溶性鹽類易解離或是以為鹽類皆可溶，使濃度改變，平衡移動；3.定容、定壓下，30.9%的學生認為加入惰性氣體不影響平衡；4.有31.6%的學生認為體積加倍，活動空間變大，碰撞機會變小，正、逆反應速率改變。

關鍵字

迷思概念 ； 勒沙特列原理 ； 化學平衡 ； 非均勻相系

並列摘要

AN INVESTIGATION ON SENIOR HIGH SCHOOL STUDENTS’
MISCONCEPTIONS OF APPLYING LE CHATELIER’S PRINCIPLE UNDER
HETEROGENEOUS SYSTEMS ON CHEMICAL EQUILIBRIUM.
Lee, Shih-Feng
Abstract
The study was aimed at investigating the misconceptions of applying Le chatelier’s principle under heterogeneous chemical equilibrium systems for senior high school students in Taiwan. Three hundred and thirty-two 12th grade students in Taoyuan who had studied chemical equilibrium participated in the study. A two-tier test was developed based on the analysis of students’ answers on an open-ended test. There are 50 multiple- choice items, including seven central concepts, where the content knowledge was examined in the first tier and students’ understanding of that knowledge in the second. The test was validated by four senior high school teachers who possessed profound professional chemistry knowledge; The reliability (KR-20) is 0.81. Data were analyzed through descriptive statistics and pearson product-moment correlation. The results indicated a list of 41 patterns of misconceptions underlying misuse of Le chatelier’s principle, 19 of which are identified in literature, whereas 22 of them are unique to this research. The most significant key-miconceptions revealed by the study are:
1.Whatever concentration of reactant may change, the rate of the forward (or reverse) reaction on initial chemical equilibrium should be equal to the rate of the forward (or reverse) reaction on final chemical equilibrium.
2.When insolube salt is dissolved in pure water to form a saturated solution, an equilibrium is established between the solid and its ions in solution. The student thought all the insoluble salt could be dissolved, which could change the solubility equilibria.

並列關鍵字

misconceptions ； Le chatelier's Priciple ； chemical equilibrium ； heterogereous systems

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