Shadowing Practice: Science in English #4 | Compounds and chemical formulas - Learn English Speaking with 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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Woordenschat en spreektips bij deze les
Deze video bevat 45 zinnen en 341 woorden om na te spreken. Het gesproken deel duurt 2:51. De spreker praat in een gelijkmatig tempo van ongeveer 120 woorden per minuut, prettig om te shadowen. Slechts 74% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
15 minder gangbare woorden uit de video, met uitspraak en betekenis:
- compound /ˈkɑmpaʊnd/ (zelfstandig naamwoord) — verbinding. Anything made by combining several things.
- element /ˈɛləmənt/ (zelfstandig naamwoord) — element. 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/ (zelfstandig naamwoord) — atoom. 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/ (zelfstandig naamwoord) — formule. Any mathematical rule expressed symbolically.
- substance /ˈsʌbstəns/ (zelfstandig naamwoord) — substantie. Physical matter; material.
- molecule /ˈmɑ.lɪ.kjul/ (zelfstandig naamwoord) — molecuul. 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/ (zelfstandig naamwoord) — zuurstof. 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/ (werkwoord) — verbinden. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
- combine /kəmˈbaɪn/ (werkwoord) — combineren. To bring (two or more things or activities) together; to unite.
- hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/ (zelfstandig naamwoord) — waterstof. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
- everyday /ˈɛvɹiˌdeɪ/ (bijvoeglijk naamwoord) — alledaags. Appropriate for ordinary use, rather than for special occasions.
- lesson /ˈlɛs.ən/ (zelfstandig naamwoord) — les. A section of learning or teaching into which a wider learning content is divided.
- compare /kəmˈpɛɚ/ (werkwoord) — vergelijken. 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/ (werkwoord) — ontdekken. To find or learn something for the first time.
- objective /ɒbˈd͡ʒɛk.tɪv/ (zelfstandig naamwoord) — object. A material object that physically exists.
Phrasal verbs die je zult horen
- find out (werkwoord) — ontdekken, onderzoeken. To discover, as by asking or investigating.
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Spreek zin voor zin na op normale snelheid en herhaal elke zin tot je ritme gelijk is aan dat van de spreker.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als compound, element, atom.
Grammatica in deze video
De structuren die de spreker het meest gebruikt, met de exacte woorden uit de video:
| Structuur | In de video |
|---|---|
| Lijdende vorm be + voltooid deelwoord — het gaat om wat er gebeurt, niet om wie het doet | is made · are connected · is called |
| Toekomst met “will” will + werkwoord — een besluit, belofte of voorspelling | will discover · will find · will understand |
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.