シャドーイング練習: Chemical and Physical Changes – Quiz Edition - 動画で英語スピーキングを学ぶ

レッスンを作成中...
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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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このレッスンの語彙とスピーキングのポイント

このB2レベルのスピーキングレッスンは、動画「Chemical and Physical Changes – Quiz Edition」を教材にしています。 繰り返し出てくる語は次のとおりです：chemical, substance, physical, transformation, dioxide。 この動画には、シャドーイング用の文が78文、単語が879語あります。 音声の長さは10:30です。 話す速さはゆっくりで、1分あたり約84語です。一つ一つの音をまねる余裕があります。 英語の頻出3,000語に含まれる単語は73%だけなので、語彙は難しめです。

この動画の重要語彙

動画の中で特に難しい単語15語を、発音と意味つきで紹介します。

単語発音意味
dioxide 名詞/daɪˈɑksaɪd/二酸化物
bake 動詞/beɪk/焼く
texture 名詞/ˈtɛkst͡ʃə(ɹ)/テクスチャ
transform 動詞/tɹænsˈfɔɹm/変形する, 変換する
lettuce 名詞/ˈlɛt.ɪs/レタス
fireplace 名詞/ˈfaɪɹpleɪs/暖炉
vinegar 名詞/ˈvɪnəɡɚ/酢, ビネガー
absorption 名詞/æbˈsɔɹp.ʃn̩/吸収, 吸い込み
rust 名詞/ɹʌst/錆
ingredient 名詞/ɪnˈɡɹiːdi.ənt/成分, 原材料
glucose 名詞/ˈɡluː.kəʊz/ブドウ糖, 葡萄糖
cube 名詞/kjub/立方体, 正六面体
tomato 名詞/təˈmeɪ.toʊ/トマト
moisture 名詞/ˈmɔɪs.t͡ʃɚ/湿気
indicator 名詞/ˈɪn.dɪˌkeɪ.tə(ɹ)/インジケータ, インジケーター

動画に出てくる句動詞

単語発音意味
go ahead 動詞/ˌɡoʊ əˈhɛd/どうぞお先に

注意したい発音

話し手はI'm, don't, hasn'tなど、短縮形や弱形を7回使っています。聞こえたとおりの短い形で発音しましょう。

  • 「sh」と「zh」の音: alteration /ɔl.tɚˈeɪ.ʃən/, absorption /æbˈsɔɹp.ʃn̩/, brownish /ˈbɹaʊnɪʃ/, shatter /ˈʃætɚ/, visualize /ˈvɪʒuəˌlaɪz/
  • 長い単語（アクセントの位置に注意）: molecular /məˈlɛk.jə.ləɹ/, alteration /ɔl.tɚˈeɪ.ʃən/, ingredient /ɪnˈɡɹiːdi.ənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, bicarbonate /baɪˈkɑɹ.bə.neɪt/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: molecular /məˈlɛk.jə.ləɹ/, fireplace /ˈfaɪɹpleɪs/, alter /ˈɔl.təɹ/, irregular /ɪˈɹɛɡ.jə.lɚ/, illustrate /ˈɪl.əˌstɹeɪt/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: vinegar /ˈvɪnəɡɚ/, evident /ˈɛv.ə.dənt/, convert /kənˈvɝt/, visualize /ˈvɪʒuəˌlaɪz/, vegetable /ˈvɛd͡ʒ.tə.bəl/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: transform /tɹænsˈfɔɹm/, fireplace /ˈfaɪɹpleɪs/, exemplify /ɛɡˈzɛmplɪfaɪ/, signify /ˈsɪɡnɪfaɪ/, solidify /səˈlɪdɪˌfaɪ/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。dioxide, bake, textureなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →