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Reading and Writing Tasks for Enhancing Students’ Learning of Chemistry Essay writing activities: • Identify the advantages and disadvantages of using synthetic polymers and metals in the construction industry. • Compare two types of renewable energy resources. • Explain why incineration is not a good method of disposal of solid waste in HK. 19,600,000 results General comments and recommendations for CE Chemistry examination report • The chemical knowledge required to answer the question has been acquired by most of the candidates. However, they failed to present their answers in a precise and systematic manner. • 考生答題時的組織及表達能力,均未如理想。考生若能就 探究為本的實驗書寫方案及就化學議題書寫文章等方面多 作練習,可改善有關技能。 The language of Chemistry - experimental report • I have conducted an experiment of titrating dilute hydrochloric acid with dilute sodium hydroxide this afternoon. At the beginning, I pipetted 25 cm3 of sodium hydroxide of unknown concentration into a conical flask…Finally, after tedious calculation, I found that the concentration of the sodium hydroxide solution is 0.10 M. The language of Chemistry - experimental report 1. 2. 3. 4. 5. 6. 7. Title Objective: e.g. To find … Principle Procedures: past tense, passive voice Results and data analysis Discussion Conclusion: relate to objective(s) The language of Chemistry • Common text structures (genres) of science/Chemistry: – Descriptive report – Procedural account – Explanation – Comparison – Argument 示例三: 認識可再生能源 Reading & writing activity - How to write a comparison essay • Reading an article about different renewable energy sources • Discuss and complete a worksheet for analysing the language features and structure of the comparison essay • Write an essay comparing two energy sources A planning tool for writing – Graphic organizers • A scaffold which provides important clues about how to organize the writing and the style of writing required. Item 1 Item 2 Comparison Both Graphic organizer for writing explanation essay Cause 1: Causes Effects Result: Cause 2: Cause 3: A frame for supporting the writing of explanation Structure Text Phenomenon Identification Explanation Sequence 1 Explanation Sequence 2 Explanation Sequence 3 Words expressing cause & effect (example: Because, since, as, as a result, therefore, thus) Students’ work • Before learning how to write causal explanation • After learning how to write causal explanation http://resources.edb.gov.hk/~science/genre/index-c.html How to motivate our students? 「科學給人的感覺是非常機械化、抽象化的。要學習 科學知識並不容易,是次課堂的設計,就以新聞片 段及實驗錄影片段來引起學生的學習動機,並多給 同學寫作和表達的機會。」 勞惠昌老師 示例二: 可充式鋰離子電池 《促進化學科學習的閱讀及寫作計畫 – 學習活動示例》(示例二) 家課: 試以教科書作者身份,在250字內介紹可充式鋰離子電池的科學。 More writing tasks about contemporary issue • Tests find concentration of active ingredient may be too low in some household bleaches (15 July 2009) • 高空擲腐蝕液體傷人事件(2009年5月16日) Watch news Ask questions Read related article Write an essay Answer questions and discuss Chemistry Teachers Professional Development and Resource Sharing Platform http://edblog.hkedcity.net/nsschem Thank You! Sophia Cheng Tel: 3698 3439 Email: [email protected]