쉐도잉 연습: Chemical and Physical Changes – Quiz Edition - 영상으로 영어 말하기 배우기

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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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이 레슨의 어휘와 말하기 포인트

이 B2 수준 말하기 레슨은 영상 “Chemical and Physical Changes – Quiz Edition”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: chemical, substance, physical, transformation, dioxide. 이 영상에는 섀도잉할 문장 78개와 단어 879개가 있습니다. 말하는 구간의 길이는 10:30입니다. 화자는 분당 약 84단어로 천천히 말해서 소리 하나하나를 따라 하기에 여유가 있습니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 73%뿐이라 어휘가 어려운 편입니다.

이 영상의 핵심 어휘

영상에서 가장 어려운 단어 15개를 발음, 뜻과 함께 정리했습니다.

단어발음뜻
dioxide 명사/daɪˈɑksaɪd/이산화물
bake 동사/beɪk/굽다
transform 동사/tɹænsˈfɔɹm/변형시키다, 변형하다
lettuce 명사/ˈlɛt.ɪs/상추
fireplace 명사/ˈfaɪɹpleɪs/벽난로, 난로
vinegar 명사/ˈvɪnəɡɚ/식초, 비네거
absorption 명사/æbˈsɔɹp.ʃn̩/흡수
rust 명사/ɹʌst/녹, 록
ingredient 명사/ɪnˈɡɹiːdi.ənt/성분
glucose 명사/ˈɡluː.kəʊz/포도당, 글루코스
cube 명사/kjub/정육면체, 바른륙면체
tomato 명사/təˈmeɪ.toʊ/토마토, 도마도
moisture 명사/ˈmɔɪs.t͡ʃɚ/습기
indicator 명사/ˈɪn.dɪˌkeɪ.tə(ɹ)/인디케이터, 지시약
soda 명사/ˈsoʊdə/소다, 탄산 나트륨

주의할 발음

화자는 I'm, don't, hasn't 같은 축약형과 약화된 형태를 7번 사용합니다. 들리는 대로 짧게 발음하세요.

  • “sh”와 “zh” 소리: alteration /ɔl.tɚˈeɪ.ʃən/, absorption /æbˈsɔɹp.ʃn̩/, brownish /ˈbɹaʊnɪʃ/, shatter /ˈʃætɚ/, visualize /ˈvɪʒuəˌlaɪz/
  • 긴 단어 — 강세 위치에 주의: molecular /məˈlɛk.jə.ləɹ/, alteration /ɔl.tɚˈeɪ.ʃən/, ingredient /ɪnˈɡɹiːdi.ənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, bicarbonate /baɪˈkɑɹ.bə.neɪt/

한국어 화자가 어려워하는 소리:

  • /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: transform /tɹænsˈfɔɹm/, fireplace /ˈfaɪɹpleɪs/, exemplify /ɛɡˈzɛmplɪfaɪ/, signify /ˈsɪɡnɪfaɪ/, solidify /səˈlɪdɪˌfaɪ/
  • /v/ — ㅂ(/b/)과 구별하기: vinegar /ˈvɪnəɡɚ/, evident /ˈɛv.ə.dənt/, convert /kənˈvɝt/, visualize /ˈvɪʒuəˌlaɪz/, vegetable /ˈvɛd͡ʒ.tə.bəl/
  • /z/ — ㅈ이 아니라 성대를 울리는 /s/: glucose /ˈɡluː.kəʊz/, expose /ɪkˈspoʊz/, categorize /ˈkætɪɡəˌɹaɪz/, compose /kəmˈpəʊz/, decompose /ˌdiːkəmˈpəʊz/

이 영상으로 연습하는 방법

  1. 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
  2. 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
  3. 자신의 목소리를 녹음해 원본과 비교하고, dioxide, bake, transform 같은 단어에 특히 주의합니다.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

섀도잉 방법: 단계별 전체 가이드 읽기 →