Pratica di Shadowing: Science in English #4 | Compounds and chemical formulas - Impara a parlare inglese con i video
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Good morning, everyone.
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Today we are going to learn about compounds and chemical formulas.
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We will discover how different elements combine to form new substances.
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Let's get started.
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Let's begin with a simple comparison.
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The English language has only 26 letters, yet those letters can create millions of words and sentences.
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Nature is very similar.
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About 118 elements combine to create millions of different substances.
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So, what do we call these new substances?
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Today, we will find out.
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Let's begin with our learning objectives.
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By the end of this lesson, you will understand what a compound is.
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You will learn about chemical bonds.
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You will recognize a molecule.
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You will also learn how to read chemical formulas.
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So what is a compound?
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A compound is a substance made from the chemical combination of two or more different elements.
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When different elements join together, they form a completely new substance.
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Let's look at some examples.
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Water, or H2O, is a compound.
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It is made from hydrogen and oxygen.
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carbon dioxide, or CO2, is another compound.
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It is made from carbon and oxygen.
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Compounds are all around us in our everyday lives.
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How do atoms stay together?
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They are connected by a chemical bond.
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A group of bonded atoms is called a molecule.
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A water molecule has two hydrogen atoms and one oxygen atom.
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A chemical formula shows the number of atoms in one molecule.
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The small number is called a subscript.
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It tells us how many atoms of each element are present.
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For example, H2O, CO2, and C12H22O11 are all chemical formulas.
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Now let's compare.
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H2O is a compound.
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CO2 is also a compound.
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But O2 is not a compound.
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Why?
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Because it contains only one element.
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A compound must contain two or more different elements.
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Let's review what we have learned today.
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Compounds are made from two or more different elements.
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Atoms are connected by chemical bonds.
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A molecule is the smallest unit of many compounds.
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Chemical formulas show the fixed ratio of atoms.
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Thank you for listening.
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Vocabolario e note di pronuncia per questa lezione
Questo video contiene 45 frasi e 341 parole da ripetere con lo shadowing. Il parlato dura 2:51. Chi parla mantiene un ritmo costante di circa 120 parole al minuto, comodo per lo shadowing. Solo il 74% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
15 parole meno comuni del video, con pronuncia e significato:
- compound /ˈkɑmpaʊnd/ (sostantivo) — composto, miscuglio. Anything made by combining several things.
- element /ˈɛləmənt/ (sostantivo) — elemento. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.
- atom /ˈætəm/ (sostantivo) — atomo. The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
- formula /ˈfɔː.mjʊ.lə/ (sostantivo) — formula. Any mathematical rule expressed symbolically.
- substance /ˈsʌbstəns/ (sostantivo) — sostanza. Physical matter; material.
- molecule /ˈmɑ.lɪ.kjul/ (sostantivo) — molecola. The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by…
- oxygen /ˈɑksɪd͡ʒən/ (sostantivo) — ossigeno. The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental…
- connect /kəˈnɛkt/ (verbo) — connettere, connettersi. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
- combine /kəmˈbaɪn/ (verbo) — combinare, mischiare. To bring (two or more things or activities) together; to unite.
- hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/ (sostantivo) — idrogeno. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
- everyday /ˈɛvɹiˌdeɪ/ (aggettivo) — quotidiano, giornaliero. Appropriate for ordinary use, rather than for special occasions.
- lesson /ˈlɛs.ən/ (sostantivo) — lezione. A section of learning or teaching into which a wider learning content is divided.
- compare /kəmˈpɛɚ/ (verbo) — paragonare. To assess the similarities and differences between two or more things [“to compare X with Y”]. Having made the comparison of X with Y, one might have found it…
- discover /dɪˈskʌvə/ (verbo) — scoprire, trovare. To find or learn something for the first time.
- ratio /ˈɹeɪ.ʃoʊ/ (sostantivo) — ragione, rapporto. A number representing a comparison between two named things.
I phrasal verb che sentirai
- find out (verbo) — scoprire. To discover, as by asking or investigating.
- look at (verbo) — guardare. To observe or watch.
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Fai shadowing frase per frase a velocità normale, ripetendo ognuna finché il tuo ritmo coincide con quello di chi parla.
- Registrati e confronta con l’originale, facendo attenzione a parole come compound, element, atom.
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | is made · are connected · is called |
| Futuro con “will” will + verbo — una decisione, una promessa o una previsione | will discover · will find · will understand |
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.