Prática de Shadowing: Introduction to Chemistry - Aprenda a falar inglês com vídeo
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1
Hey guys, I'm Professor Dave, and I want to tell you about chemistry.
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What is chemistry?
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Why should we know about it?
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Chemistry is the study of what matter is made of and how it changes.
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It's important to know because it describes everything around us, every material, almost every process.
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If we truly want to understand how our bodies work, how diseases operate and how to cure them, which foods are nutritious and which are not, we must learn chemistry.
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Unless you fundamentally understand molecules, all you can do is repeat things you've heard.
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But how do you know if what you've heard is right?
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If you know chemistry, you can compare what someone says to how you know that molecules behave.
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If there is a glaring contradiction, you can easily reject false information, and you won't be taken advantage of for someone else's personal gain.
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We should be able to think critically like this in every avenue of life, be it health, politics, or otherwise.
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With this general chemistry series, I have two goals.
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One is to help high school and undergraduate students taking their first chemistry course.
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Please use these tutorials to supplement your lectures in any way that is helpful to you.
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But because this is introductory material, and given that chemistry is the central science,
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this general chemistry series is also meant for anyone who wants to learn science with no prior knowledge and for any reason.
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I will break down concepts as simply as possible so that anyone can learn them.
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There will be moments where we go over practice problems that are more geared towards students in a class.
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But feel free to learn these too, because the predictive power of mathematics is what proves the legitimacy of our science.
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If you are watching this clip and intend to view the entire series, please click on the general chemistry playlist on the Professor Dave homepage to view in the suggested order.
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When we check our comprehension after a lesson, feel free to pause the clip so you have plenty of time to think before I tell you the answer.
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If you need to watch a clip more than once to fully understand it, that's okay.
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And if you have any questions about what you've learned, feel free to email me at ProfessorDaveExplains at gmail .com.
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Enjoy your newfound knowledge.
📺 Mesmo canal
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível C1 usa o vídeo “Introduction to Chemistry”. As palavras que mais se repetem: chemistry, learn, clip, science. Este vídeo tem 24 frases e 396 palavras para praticar shadowing. A fala dura 2:01. O falante fala rápido, cerca de 196 palavras por minuto, então espere sons ligados e reduzidos. 85% das palavras estão entre as 3.000 mais comuns do inglês; vale a pena estudar o restante antes de começar.
Vocabulário principal deste vídeo
As 14 palavras mais avançadas do vídeo, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| molecule substantivo | /ˈmɑ.lɪ.kjul/ | molécula |
| contradiction substantivo | /ˌkɑːntɹəˈdɪkʃən/ | contradição |
| nutritious adjetivo | /nuːˈtɹɪʃəs/ | nutritivo, nutriente |
| predictive adjetivo | /pɹɪˈdɪk.tɪv/ | preditivo |
| introductory adjetivo | /ˌɪntɹəˈdʌktəɹi/ | introdutório |
| comprehension substantivo | /ˌkɑmpɹɪˈhɛnʃn̩/ | compreensão |
| playlist substantivo | /ˈpleɪˌlɪst/ | playlist |
| legitimacy substantivo | /ləˈd͡ʒɪtɪməsi/ | legitimidade, validade |
| tutorial substantivo | /ˌtjuːˈtɔːɹɪəl/ | tutorial |
| undergraduate substantivo | estudante de graduação, graduando | |
| pause substantivo | /pɔːz/ | pausa |
| behave verbo | /bɪˈheɪv/ | comportar-se |
| supplement substantivo | /ˈsʌp.lɪ.mənt/ | suplemento, adendo |
| intend verbo | /ɪnˈtɛnd/ | pretender, tencionar |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | you've heard · you've learned |
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | is made · won't be taken · is also meant |
| Orações relativas who / which + oração — informação extra sobre uma pessoa ou coisa | and which are · anyone who wants |
Pronúncia para ficar de olho
O falante usa 5 contrações e formas reduzidas, como you've, I'm, won't. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “sh” e “zh”: contradiction /ˌkɑːntɹəˈdɪkʃən/, nutritious /nuːˈtɹɪʃəs/, comprehension /ˌkɑmpɹɪˈhɛnʃn̩/
- Palavras longas — acerte a sílaba tônica: contradiction /ˌkɑːntɹəˈdɪkʃən/, introductory /ˌɪntɹəˈdʌktəɹi/, legitimacy /ləˈd͡ʒɪtɪməsi/, critically /ˈkɹɪt.ɪ.kə.li/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: newfound /ˈnjuː.faʊnd/, playlist /ˈpleɪˌlɪst/, supplement /ˈsʌp.lɪ.mənt/, intend /ɪnˈtɛnd/
- /l/ final — a língua toca o céu da boca, não vira “u”: molecule /ˈmɑ.lɪ.kjul/, tutorial /ˌtjuːˈtɔːɹɪəl/
- /h/ — um sopro suave, diferente do “r”: comprehension /ˌkɑmpɹɪˈhɛnʃn̩/, behave /bɪˈheɪv/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como molecule, contradiction, nutritious.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.