Pratica di Shadowing: Rock Candy! - Impara a parlare inglese con i video
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Have you ever wanted to make your own rock candy?
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Well, today I am going to teach you how with my rock candy science experiment.
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Hi everyone, I'm Emily Calandrelli, MIT engineer and host of Emily's Flunder Lab.
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And on my channel, we learn about all things space and science.
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So grab your sugar and get ready for some sweet science.
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Today I'm going to teach
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you how to make colorful rock candy sticks using science here's
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what you need rock candy sticks one cup of water three
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cups of white granulated sugar plus a little extra to sprinkle
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on your rock candy sticks a few different glasses some clothes pins
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and some food coloring the first thing
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you want to do is you want to get the bottom third of your rock candy sticks wet
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you can do this by running it under water in the sink
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i'm just going to do it like this here
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and then after you do
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that for a few seconds lay them out on a plate just like that
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and we are going to sprinkle some sugar on top of them
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you just want to completely coat your rock candy sticks get
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as much sugar on there as possible might be a little overkill
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but that's okay just go ahead
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and roll it around in the sugar set your rock candy
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sticks aside to dry for at least an hour ideally overnight once your candy sticks are completely dry
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you are ready to make your saturated solution of sugar here's how you do
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that add one cup of water to a pot
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and then add three cups of white granulated sugar one stir
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that in so that it dissolves
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and as we heat this up this will dissolve even better there's two stir
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that in what we are doing here is we are saturating the solution meaning
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we're adding as much sugar as humanly possible to this water at this temperature
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it will not be able to even
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if it wanted to dissolve more sugar stir
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that in now put your heat on high what we want to do is bring our solution to a boil
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and allow it to boil for two minutes.
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Now that your solution is boiling, give it a good mix.
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Make sure all of that sugar has dissolved.
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And after that two minute timer is up, go ahead and turn your soap top off.
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And we're going to let this cool for about 15 minutes before we transfer it to our glasses.
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As your solution cools, we can prepare our glasses with our rot candy sticks.
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So go ahead and we want it to look like this.
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We want it to be suspended in the glass not touching the bottom
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and not touching the sides and clothespins work really well for this.
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For bigger glasses I'll show you how to do it.
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So we have a rock candy stick that has dried overnight.
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One clothespin here I'm going to measure make sure it's not touching the bottom there.
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I'm going to do one of these and then a second one right here and place it right in the center there.
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So now that they are all prepared
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and they're not touching the bottom they're not touching the sides go ahead
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and take them out
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because we are going to put our sugar solution in the glasses one thing
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you can do to prepare your glasses for the still pretty
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hot solution is to run them under hot water to make sure
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that you're not going to break your glasses by pouring in the hot sugar solution
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because we were measuring our rock candy sticks in here just clean them out make sure
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there's no more sugar inside your glasses and just like
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that you are ready to pour in your saturated sugar solution
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so very carefully
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because it'll still be a little hot pour it into as many glasses as you like careful with the glasses
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because they will be hot
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and depending on the size of your glasses you may have more glasses
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you may have less now for the fun part we are going to make this colorful I'm going to use purple,
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stir it with a spoon.
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Oh, beautiful.
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Look at that.
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Stir it up. And then finally, blue.
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Now we are ready to put in our rock candy sticks into the solution
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and I recommend putting the glasses where you're going to leave them for the next seven days
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because we ideally you would leave these sitting letting them crystallize for a week.
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The science experiment takes patience but the end result.
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It's pretty amazing.
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So go ahead, once they're there where you want them, carefully, slowly place your rock candy stick in the solution.
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You want to cover up as much of the stick as possible.
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I have found that long skinny glasses work really well for this because you're not using as much solution, but you're covering that entire rock stick.
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Our beautiful blue one.
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So now we just wait.
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And what's going to happen as we wait over the next few days?
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Well, crystals are going to start building on your rock candy sticks because the solution is going to cool.
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Why does that matter?
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Well, hot sugar solution can hold more sugar than cold sugar solution.
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And as the solution cools, that sugar is going to want to jump out of the solution to undissolve from the solution.
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That's why we covered our rock candy sticks with sugar, because that sugar that wants to undissolve, it wants to hold on to something.
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And that little something was our seed crystals on our rot candy sticks.
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So day by day, you will see more crystals building on your sticks.
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And after the first day, they're a little bit small, but be patient because they get bigger and bigger and bigger.
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And at the end of a week, you'll have a very beautiful rot candy crystal.
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These were some rot candy crystals I prepared ahead of time.
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And after a few days of waiting, it'll look like this.
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You'll notice some crystals growing on your rock candy stick,
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but you'll also notice some sugar crystals on the bottom of the glass and right on the surface.
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So to get your rock candy out, you want to take your clothespin
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and just kind of break the surface of the sugar just like
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that because we just want to be able to pull our stick out easily.
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once you've done that wiggle your candy stick around
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and take it out and you'll notice it's still dripping
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that sugar liquid there get your clothespin bring it to another glass
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and let it drip for just like 10 minutes that's all you need
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and then once
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that happens you'll be able to have a delicious rock candy crystal this one has been waiting in
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that solution for about three days
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so you can tell it's not very big that's why patience is key with this experiment
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this one has only been in there for about two days so it's quite small and a word to the wise
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use rot candy sticks instead of skewers we use skewers here and you'll notice some variability
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because they have a hard time holding on to the sugar
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when we coated our sticks with sugar at the start for our seed crystals.
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Some of them stayed on.
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Some of them fell off.
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Rot candy sticks are much better at this.
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So when you're shopping, get rot candy sticks.
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Our sugar solution became super saturated as it cooled down and created all of these beautiful crystals.
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This one was waiting for two days.
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This one was three days.
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These were all four days.
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And this big guy was eight days.
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You can see it mostly collected at the top here
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because again we used a skewer and all of those seed crystals fell off of the bottom.
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So none of the crystals grew down here, but they very much grew up there, creating quite the unique crystal.
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Very cool.
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These sugar crystals have these beautiful geometric shapes because crystals occur when atoms arrange themselves in highly organized repeating patterns,
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creating these beautiful geometric shapes thank you for making rock candy with me today
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if you like this one be sure to check out my best -selling stay curious
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and keep exploring book series for 99 more science experiments i'm emily calendrelli subscribe for all things science
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and space and remember stay curious and keep exploring i'll see you next time
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Vocabolario e note di pronuncia per questa lezione
Le parole che ritornano più spesso: candy, sugar, stick, solution, rock. Questo video contiene 121 frasi e 1436 parole da ripetere con lo shadowing. Il parlato dura 8:52. Chi parla ha un ritmo naturale di circa 162 parole al minuto, vicino a una conversazione quotidiana. Il 85% delle parole rientra nelle 3.000 più comuni dell’inglese; conviene studiare le altre prima di iniziare.
Vocaboli chiave di questo video
15 parole del video che vale la pena imparare, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| candy sostantivo | /ˈkæn.di/ | caramella, confetto |
| crystal sostantivo | /ˈkɹɪstəl/ | cristallo |
| stir verbo | /stɝ/ | mescolare |
| experiment sostantivo | /ɪkˈspɛɹ.ə.mənt/ | esperimento |
| pour verbo | /poɹ/ | versare |
| boil verbo | /bɔɪ(ə)l/ | far bollire |
| saturated aggettivo | saturato | |
| carefully avverbio | /ˈkɛɹf(ə)li/ | minuziosamente, accuratamente |
| curious aggettivo | /ˈkjʊɹ.i.əs/ | curioso, interessato |
| coat sostantivo | /ˈkoʊ̯t/ | mantello, cappotto |
| explore verbo | /ɪkˈsploɹ/ | esplorare, investigare |
| patience sostantivo | /ˈpeɪ̯.ʃəns/ | pazienza |
| overnight avverbio | /əʊvə(ɹ)ˈnaɪt/ | da un giorno all'altro, da un momento all'altro |
| colorful aggettivo | /ˈkʌl.əɹ.fl̩/ | colorato, variopinto |
| ideally avverbio | /aɪˈdi.ə.li/ | idealmente, preferibilmente |
I phrasal verb che sentirai
| Parola | Pronuncia | Significato |
|---|---|---|
| go ahead verbo | /ˌɡoʊ əˈhɛd/ | procedere, andare avanti |
| check out verbo | investigare | |
| cover up verbo | insabbiare, occultare | |
| grow up verbo | crescere | |
| stick out verbo | sporgere |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Present perfect have/has + participio passato — un’azione passata che conta ancora adesso | Have you ever wanted · has dissolved · has dried |
| Possibilità con “might / may” might/may + verbo — qualcosa di possibile ma non certo | might be · may have |
| Past continuous was/were + -ing — un’azione in corso in un momento del passato | were measuring · was waiting |
| Verbo + -ing enjoy, keep, stop… + -ing — i verbi seguiti dalla forma in -ing | keep exploring |
Pronuncia a cui fare attenzione
Chi parla usa 29 contrazioni e forme ridotte, come I'm, you'll, you're. Pronunciale nella forma breve, così come le senti.
- I suoni “sh” e “zh”: patience /ˈpeɪ̯.ʃəns/, delicious /dɪˈlɪ.ʃəs/
- Parole lunghe — attenzione all’accento: experiment /ɪkˈspɛɹ.ə.mənt/, ideally /aɪˈdi.ə.li/, geometric /ˌd͡ʒiː.əʊˈmɛt.ɹɪk/, variability /ˌvæɹ.i.əˈbɪl.ə.ti/
I suoni difficili per chi parla italiano:
- Consonante finale — senza aggiungere una vocale dopo: experiment /ɪkˈspɛɹ.ə.mənt/, curious /ˈkjʊɹ.i.əs/, coat /ˈkoʊ̯t/, patience /ˈpeɪ̯.ʃəns/, overnight /əʊvə(ɹ)ˈnaɪt/
- /æ/ — più aperta della “e”: candy /ˈkæn.di/, atom /ˈætəm/, granulate /ˈɡɹæn.jul.eɪt/, variability /ˌvæɹ.i.əˈbɪl.ə.ti/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come candy, crystal, stir.
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.