跟讀練習: Chemical and Physical Changes – Quiz Edition - 通過影片學習英語口語
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78 句
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Music Take notes as you watch this video and take the short quiz at the end.
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Every day we observe a myriad of changes around us.
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A car can get crushed into a compact cube of metal at a junkyard.
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A fire can burn logs in a fireplace, turning them into ash and smoke.
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Bread bakes to a crispy golden brown loaf.
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And metal rusts when exposed to moisture and air.
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Each transformation, whether big or small, is a testament to the ever-changing nature of matter around us.
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In science, we dissect these transformations and categorize them into two primary types, physical and chemical changes.
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In a physical change, the form or state of matter changes, but the molecular structure remains the same.
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No new matter is made.
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For instance, consider the process of ice melting.
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As the temperature rises, the ice transforms from a solid state into liquid water.
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Even though the state and appearance change, the water molecules are still H2O, maintaining their original molecular structure.
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This transformation illustrates a physical change, where the state alters without changing the substance itself.
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Let's take a look at some examples of physical changes in action.
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Consider a sheet of paper.
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With a pair of scissors, the paper is cut into smaller pieces.
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The shape and size of the paper change, but chemically, it is still paper.
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Each piece retains the same properties as the original sheet.
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Another example of a physical change.
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Now think about a piece of modelling clay.
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In your hands, it can be moulded, stretched and shaped into various forms, a ball, a cube, or even a miniature animal.
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Though the shape transforms, the composition of the modelling clay remains consistent.
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The changes are physical, not chemical.
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Consider the act of making a salad.
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Crisp lettuce is torn, vegetables are sliced, and ingredients are mixed together in a bowl.
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The various components change in shape and texture as they are prepared and combined, but their chemical composition remains the same.
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The lettuce is still lettuce.
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The tomato remains a tomato.
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The salad, brimming with an assortment of colours and textures, exemplifies a physical change.
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Lastly, visualize a glass falling to the floor and smashing into pieces.
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The integrity of the glass is compromised.
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It shatters.
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However, each fragment, sharp and irregular, is still glass.
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The chemical composition hasn't altered.
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Thus, we are once again witnessing a physical change.
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Chemical changes involve a transformation at the molecular level, where the original substance turns into a different substance with new properties.
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It is characterised by the formation of new chemical substances and often involves energy changes,
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evident through the release or absorption of heat, light or sound.
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Various indicators like change in colour, production of gas or the formation of precipitate can denote a chemical change.
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When iron is exposed to oxygen and moisture, it undergoes a chemical change resulting in in the formation of a new substance, rust, iron oxide.
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This is evident by the change in color from metallic gray to brownish red, and the alteration in the material's properties like strength and appearance.
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The chemical composition of iron changes, proving that it's not just a physical alteration, but a chemical change.
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In a fireplace, wood burns and transforms into ash, heat and gases.
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This is accompanied by the release of light and heat, indicating a chemical change.
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The original wooden logs, primarily composed of cellulose and other organic compounds,
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are converted into new substances like carbon dioxide, water vapour and ash.
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The visible flames and the change in material composition underscore this transformation as a chemical change.
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When the raw ingredients like flour, eggs and sugar are baked, they transform into a cake.
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It's not just a state change.
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New compounds are formed during the baking process, changing the taste, texture and colour.
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The cake's aroma and the solidified fluffy texture are evidence of a chemical change where new substances with distinct properties are created.
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Plants convert carbon dioxide and water into glucose and oxygen using sunlight.
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This transformation is marked by the emergence of new substances, glucose and oxygen, which were not originally present.
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The absorption of light energy and the creation of food and oxygen signify a chemical change.
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When baking soda and vinegar are mixed, there is an immediate fizzing and bubbling reaction.
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This is due to the formation of carbon dioxide gas, a new substance.
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The chemical reaction occurs as acetic acid in the vinegar reacts with the bicarbonate in the baking soda to form carbonic acid,
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which quickly decomposes into water and carbon dioxide gas.
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The evolution of gas, change in temperature, and the formation of new substances like carbon dioxide,
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water and a type of salt are clear indicators of a chemical change.
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Do you think you can identify changes to matter as either physical changes or chemical changes?
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Let's put your knowledge to the test.
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Thank you.
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I'm
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going to
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go ahead and put it in the middle of the room.
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I'm
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going to go to the next video.
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Let's go.
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I'm
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going to
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go to the next video.
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I'm
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going to
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go ahead and put it in the middle of the room.
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Thanks for learning, and I'll see you next time.
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Don't forget to subscribe!
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本課的詞彙與口語要點
這節 B2 級別的口語課以影片“Chemical and Physical Changes – Quiz Edition”為素材。 影片中反覆出現的詞有：chemical, substance, physical, transformation, dioxide。 這段影片共有 78 個句子、879 個單詞可供跟讀。 講話部分時長為 10:30。 說話人語速較慢，每分鐘約 84 個詞，你有足夠的時間模仿每一個音。 只有 73% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中最難的 15 個單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| dioxide 名詞 | /daɪˈɑksaɪd/ | 二氧化物 |
| bake 動詞 | /beɪk/ | 烤, 烘 |
| texture 名詞 | /ˈtɛkst͡ʃə(ɹ)/ | 質地 /質地, 材質 /材質 |
| transform 動詞 | /tɹænsˈfɔɹm/ | 變換 /變換, 變形 /變形 |
| lettuce 名詞 | /ˈlɛt.ɪs/ | 萵苣 /萵苣 |
| alteration 名詞 | /ɔl.tɚˈeɪ.ʃən/ | 異動 /異動 |
| fireplace 名詞 | /ˈfaɪɹpleɪs/ | 壁爐 /壁爐, 暖爐 /暖爐 |
| vinegar 名詞 | /ˈvɪnəɡɚ/ | 醋 |
| absorption 名詞 | /æbˈsɔɹp.ʃn̩/ | 吸收 |
| rust 名詞 | /ɹʌst/ | 鏽 /鏽, 鐵鏽 /鐵鏽 |
| ingredient 名詞 | /ɪnˈɡɹiːdi.ənt/ | 成份, 材料 |
| cube 名詞 | /kjub/ | 立方體 /立方體 |
| tomato 名詞 | /təˈmeɪ.toʊ/ | 西紅柿 /西紅柿, 番茄 |
| moisture 名詞 | /ˈmɔɪs.t͡ʃɚ/ | 濕氣 /溼氣 |
| indicator 名詞 | /ˈɪn.dɪˌkeɪ.tə(ɹ)/ | 指示符 |
影片中出現的短語動詞
| 單詞 | 發音 | 釋義 |
|---|---|---|
| go ahead 動詞 | /ˌɡoʊ əˈhɛd/ | 請便 /請便 |
需要注意的發音
說話人用了 7 次縮略和弱讀形式，例如 I'm, don't, hasn't。請按聽到的簡短形式來說。
- “sh” 和 “zh” 音: alteration /ɔl.tɚˈeɪ.ʃən/, absorption /æbˈsɔɹp.ʃn̩/, brownish /ˈbɹaʊnɪʃ/, shatter /ˈʃætɚ/, visualize /ˈvɪʒuəˌlaɪz/
- 長單詞——注意重音位置: molecular /məˈlɛk.jə.ləɹ/, alteration /ɔl.tɚˈeɪ.ʃən/, ingredient /ɪnˈɡɹiːdi.ənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, bicarbonate /baɪˈkɑɹ.bə.neɪt/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: vinegar /ˈvɪnəɡɚ/, evident /ˈɛv.ə.dənt/, convert /kənˈvɝt/, visualize /ˈvɪʒuəˌlaɪz/, vegetable /ˈvɛd͡ʒ.tə.bəl/
- 詞尾子音 — 要讀清楚，後面不要加母音: dioxide /daɪˈɑksaɪd/, bake /beɪk/, lettuce /ˈlɛt.ɪs/, fireplace /ˈfaɪɹpleɪs/, rust /ɹʌst/
- /r/ 和 /l/ 的區別: molecular /məˈlɛk.jə.ləɹ/, fireplace /ˈfaɪɹpleɪs/, alter /ˈɔl.təɹ/, irregular /ɪˈɹɛɡ.jə.lɚ/, illustrate /ˈɪl.əˌstɹeɪt/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 dioxide, bake, texture 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。