Shadowing-Übung: 5 Easy At Home Science Experiments w/ Mark Rober - Englisch Sprechen Lernen mit Video
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Today we're going to do five at home experiments that are very near and dear to my heart.
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And for the first time ever, we're sharing the recipe for our favorite bit of chemistry called elephant's toothpaste.
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We've got some epic science lined up, and the coolest thing is that all of them can be easily done at home yourself.
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Whoa, whoa, Bob, whoa.
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First up is my childhood favorite, the egg in a bottle experiment.
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All right, science Bob Flugfelder.
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I did this at the science fair when I was in first grade.
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The main reason I liked it is because it involved fire.
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And I was allowed to light things on fire.
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I'm impressed.
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The ingredients for this experiment are very simple.
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We have an egg that's peeled, hard boiled, just like a standard milk bottle you could order off the internet.
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The neck size is very important though.
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You want it to be just smaller than an egg.
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How do you get the egg into this jar?
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Because as you can see, it can't really work.
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It breaks the egg.
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That could have been a mistake.
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There we go.
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How do you get an egg into this jar without breaking the egg and making a mess like this?
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What's the secret?
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The secret, Bob, is fire.
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First off, goggle up for safety.
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Gonna grab these papers with Tons.
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Gonna light the paper, put it in the jar, put the egg on top.
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Look at that.
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A fully intact, non -broken egg is now inside this jar.
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When air heats up, the molecules want to stretch out.
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They're moving around a lot.
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So when we light that fire, the air inside, it wants to stretch out.
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Then all the air molecules kind of suck back together, and it just pulls the egg right back into the jar.
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So now the question is, Bob, how do we get this out?
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So you have to go from a vacuum to pressure.
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We just blow into this jar, huh?
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad Woohoo!
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Now your challenge is to get that out, Bob.
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Oh my gosh.
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That's all we get.
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I say we got one bigger.
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Okay.
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There we go.
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There it is.
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There's the blup blup.
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Oh boy!
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Oh boy!
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Come on!
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It's coolin'.
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Wow.
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Man, we're getting so close.
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And we can't push it in either.
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No. We need to try.
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Well, wait.
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Well, can we?
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Oh.
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That's even cooler.
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So that shows you just how much this air shrinks and expands when it gets hot, right?
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It's a good start, Bob.
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Next up is Bob's favorite experiment, slime, and here's why.
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Here is a picture of me at seven years old making my first ever batch of slime.
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That is my evil scientist face.
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A lot of people know how to make slime.
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Yeah.
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There's this old craft glue.
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The secret of this is a chemical called polyvinyl alcohol.
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Now, I add just a little touch of water.
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So this is still obviously very watery.
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The next I've got Borax
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and Borax you'd actually find in the cleaning aisle I'm gonna take a teaspoon five milliliters
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And then we're gonna add about a half a cup of
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water nice thing about slime everyone's slime's a little bit different right now We got glue and water.
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Yep, Borax and water.
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Yep.
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Also important.
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You want to add your color now.
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I'm going jello pool right Bob?
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I love the jello pool.
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How much of that should I do?
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Not too much.
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Why?
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It's gonna get on your hands.
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Your hands will be red for the rest of the video.
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So you want to add it to your glue Solusion two drops.
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Yeah, let's start off - I'm doing three don't tell Bob.
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I heard that whoa you're very happy with that There are molecules in here, and they're all loose the borax is gonna bond all those
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together you want to just kind of experiment here I'm gonna take maybe a teaspoon of this
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and you can see right away look I'm doing three whatever you want Okay, but mine's like kind of goopy and runny that means
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that you still don't have a lot of bonds that have bonded so you add a little more Bonding activity.
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Whoa, so if you let it sit for just a little bit of time, it's a difference, right?
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It does.
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I like how it doesn't like Get on your hands.
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It seems like it would be sticky, but it's not.
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What if I were to add color now?
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It would be very hard to mix in right because all those bonds are made.
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Give it a try.
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My hypothesis is that Mark's hands are gonna be blue the rest of the video.
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Uh oh.
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It might be blue the rest of the week.
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That is cool.
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It looks like a blue heart.
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I I'm gonna go wash my hands.
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For at home science experiment number three, we've got a fun one.
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That's pretty simple.
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You just take a very clean plate and just put a nice little layer of water.
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Have you ever seen those water spiders that like glide on top of the water?
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The question is like why does it float on the water?
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Why does it just sink?
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We're gonna demonstrate that a little bit while I just pour a lot of pepper.
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It's on the surface.
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It's like one of those water spiders.
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of it on your finger like
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so put it wherever you want I'm gonna go right in the center I'm a magician I am a powerful wizard!
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Pepperous, Repellicus!
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Woah!
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You're a wizard, Bobby!
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What's happening here is disc soap has this special ability.
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It's called a surfagant.
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Surface tension is all the top layer of molecules in the water that are all joining arms.
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They're hanging together.
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Well, soap has the special ability to break those.
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As soon as you put soap, it rips that apart.
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And then almost like a rubber band, they all go to the side.
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And this is why disc soap is so good at cleaning things.
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like magic.
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But it's actually real.
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For experiment number four, it's super easy.
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For this, you need a clear glass and-- uh -oh.
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Whoa.
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Whoa, Bob.
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Whoa.
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So this is seltzer water.
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Put a couple of raisins in here.
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And you see how immediately we got bubbles released, right?
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All right, now put some of these popcorn kernels in.
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So far, Bob, I'm not going to lie.
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This is kind of a boring-- It's kind of lame.
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I get it.
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Now we have our dancing popcorn.
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They float.
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OK, they float.
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A dent.
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Wait, what?
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What is going on?
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that nucleate on it from the carbon dioxide.
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That's like arm floaties that are gonna float you to the top.
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And then when it gets exposed to the air, the arm floaties get popped, they sink, they get more arm floaties, they go to the top.
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So I figure let's add a variable, let's do it in something taller, right?
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I think there's no way a corn kernel will go all the way to the bottom.
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Okay, I'm dumping all these in with my blue hands, which someone didn't warn me about.
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Whoa, it's like a race to the top.
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Oh, okay, halfway, three quarters.
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Oh, go.
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Yeah, we hit the bottom.
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This is actually way more impressive in a tall cylinder.
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This is like a corn lava lamp.
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Get out of here, Bob.
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I don't know how it's gonna work.
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I haven't tried this.
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My hypothesis is that we're gonna get one that goes all the way down.
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I don't think that.
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Go, go, go, go, go, go.
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No. No. Come on, you got this.
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Oh, go, go, go.
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No. We're getting closer, dude.
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We're getting closer.
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Oh, yes.
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Experimentation and science looks and feels like you guys.
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We're just thinking of these things on the fly.
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We're curious.
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We're asking questions and we answer the questions.
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One question we had was which of the three containers would keep the corn moving the longest?
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And spoiler alert, it was the biggest one.
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Which had the most liquid and therefore the most carbon dioxide, or bubbles, stored up in the water.
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It's time for experiment number five.
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Bob, what is it?
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Elephant soupy.
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You guessed it.
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And this is an experiment, just like all these, that you should definitely be doing with a parent or some kind of adult.
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So let's start with our hydrogen peroxide.
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We're gonna do six ounces.
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I want you to get three tablespoons of warm water.
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There we go.
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To that, we're gonna add one tablespoon of the dry yeast.
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- Okay.
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- Now, I'm gonna have you mix that up.
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- Okay, it's a little like hydrophobic, or meaning it doesn't mix well with water, unless you really try.
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- So while we let that kind of mix a little bit, I'm gonna go with a good squirt of our dish soap, maybe like a tablespoon.
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And finally, some color, classic red.
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Okay, so let's review.
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In here, we have our hydrogen peroxide, liquid soap, and we have our coloring.
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- Yes.
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- In here, we've got our yeast and warm water.
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And then the last step is to mix them together.
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It's a catalyst.
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It's gonna speed up a reaction that's already happening.
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There we go.
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Okay, ready?
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Ready.
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Pouring, pouring, pouring, pouring.
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Whoa, here it comes, Bob.
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Wow, it's so smooth.
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It looks delicious.
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Very laminar.
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Oh, that's so beautiful.
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Whenever I smell this, it brings back so many fond memories.
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We ran so many experiments trying to get the right combinations
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and we just weren't getting as much volume as I wanted
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So I called up science Bob told me exactly what you're doing and you weren't using warm water
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Variable we weren't considering why do you think warm water does the trick formula for water is H2O right?
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So here's my little model.
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So this is your H and that's your two O's right?
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So you got H2O got it with hydrogen peroxide.
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It's H2O2 It hugs up with one of the other O's that pulled apart and now we've got oxygen and water.
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This is why you want the right amount of catalysts to pull these off.
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If you don't have enough, maybe only half of the hydrogen peroxide molecules get ripped off like this, right?
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So many experiments.
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All right, so that was the at -home version.
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That's right.
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Now this is 30%, which is why we have got our goggles on, we have got our gloves on.
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And for the first time ever, I'll say why Bob pours this in.
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In the video description, we are putting the recipe for this version of elephant toothpaste.
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The trick is you gotta do it with the science teacher.
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'Cause only a science teacher will be able to get this 30 % hydrogen peroxide.
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Plus it is more dangerous, so.
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- Don't wanna do it in your kitchen.
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- Or your bedroom.
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- What in the world?
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That's my office.
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- Okay, great.
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Three tablespoons.
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Now we have soapy hydrogen peroxide.
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- In honor of elephant juice based 3 .0, I say we'd agree.
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- Believe that got us a Guinness world record.
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And now our catalyst is no longer yeast.
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using a chemical called potassium iodide.
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- Your science teacher will get easy access to it.
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- We saw the home version, let's do the television version.
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- Television version, here we go.
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- I'm gonna give you the honors.
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There it is.
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And you step back.
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Woo!
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Ho ho ho ho ho!
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We had discussed moving it away from Skate's Drop.
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- Here you go.
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Uh -oh, Bob.
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- Here comes the big one.
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- Whoa!
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- It is definitely warm.
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- Yeah, so this is an exothermic reaction, which means it gives off heat.
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Definitely don't wanna touch this phone.
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- Yeah.
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- And you also notice that it's got these brown highlights.
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- Yeah, what's up with that?
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- So that's the iodine from the potassium iodide, which is brown.
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Let's add one more variable just to see what happens.
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- Okay.
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- Version three.
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Again, we're just adding a variable.
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- And ideally, you just change one variable.
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In science, the reason you change just one variable is now if the result is different, you know it's because of that variable.
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The result will be different.
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You don't know which caused it.
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If this looks different, we know it's because of the container.
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We are using glued food coloring because we haven't used glue yet.
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Same catalyst, same amount. And it goes.
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Oh!
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I was not expecting that.
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Wow.
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It just plopped out, Bob.
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And a lovely blue coloring.
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We got our gloves on, but it's still hot.
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I can feel the heat on that.
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- Ooh, yeah, that's really warm.
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Even through the gloves, you can feel the warmth.
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- So even if you do a home version, find a variable and experiment.
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- And change it and get it to look as cool as possible.
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The most important words in science aren't eureka, That's interesting.
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'Cause you do stuff that you're like, whoa, I wasn't expecting that.
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So let us know in the comments what experiments you wanna see us do next.
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If you try 'em yourself, of course, tag us on our socials at Crunch Labs.
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We'll catch you next time, right here at Crunch Labs.
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Bye.
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Wortschatz und Sprechhinweise zu dieser Lektion
Dieses Video enthält 293 Sätze und 2302 Wörter zum Nachsprechen. Der gesprochene Teil dauert 12:08. Der Sprecher spricht schnell, etwa 190 Wörter pro Minute – rechne mit verbundenen und verkürzten Lauten. 82 % der Wörter gehören zu den 3.000 häufigsten im Englischen; den Rest solltest du dir vor dem Üben ansehen.
Wichtiger Wortschatz in diesem Video
15 lernenswerte Wörter aus dem Video, mit Aussprache und Bedeutung:
| Wort | Aussprache | Bedeutung |
|---|---|---|
| experiment Substantiv | /ɪkˈspɛɹ.ə.mənt/ | Experiment, Versuch |
| whoa | /woʊ/ | brr, oha |
| variable Adjektiv | [ˈvæɹ.i.ə.bl̩] | variabel |
| soap Substantiv | /soʊp/ | Seife |
| pour Verb | /poɹ/ | gießen, schütten |
| hydrogen Substantiv | /ˈhaɪdɹəd͡ʒ(ə)n/ | Hydrogen, Hydrogenium |
| glue Substantiv | /ɡlu/ | Klebstoff, Leim |
| molecule Substantiv | /ˈmɑ.lɪ.kjul/ | Molekül |
| float Verb | /fləʊt/ | treiben, schwimmen |
| catalyst Substantiv | /ˈkæt.ɪ.lɪst/ | Katalysator |
| corn Substantiv | /ˈkɔːn/ | Getreide, Korn |
| elephant Substantiv | /ˈɛlɪfənt/ | Elefant, Elefantenbulle |
| glove Substantiv | /ɡlʌv/ | Handschuh |
| yeast Substantiv | /jist/ | Hefe, Bärme |
| trick Substantiv | /ˈtɹɪk/ | List, Falle |
Phrasal Verbs, die du hören wirst
| Wort | Aussprache | Bedeutung |
|---|---|---|
| call up Verb | abrufen | |
| give off Verb | /ɡɪv ɒf/ | emittieren, abgeben |
| heat up Verb | erhitzen, aufheizen | |
| pull apart Verb | trennen | |
| rip off Verb | abziehen, übers Ohr hauen | |
| speed up Verb | /spiːdˈʌp/ | beschleunigen |
Aussprache, auf die du achten solltest
Der Sprecher verwendet 88 Kurzformen und abgeschwächte Formen, zum Beispiel gonna, I'm, we're. Sprich sie in der kurzen Form, so wie du sie hörst.
- Die „th“-Laute: hypothesis /haɪˈpɒθɪsɪs/, smooth /smuːð/, warmth /wɔɹmθ/, toothpaste /ˈtuθpeɪst/
- Die Laute „sh“ und „zh“: delicious /dɪˈlɪ.ʃəs/, tension /ˈtɛnʃən/, dish /dɪʃ/, gosh /ɡɑːʃ/, combinations /kɑmbɪˈneɪʃənz/
- Lange Wörter – auf die Betonung achten: experiment /ɪkˈspɛɹ.ə.mənt/, hypothesis /haɪˈpɒθɪsɪs/, combinations /kɑmbɪˈneɪʃənz/, ideally /aɪˈdi.ə.li/, ingredient /ɪnˈɡɹiːdi.ənt/
So übst du mit diesem Video
- Höre dir das ganze Video einmal an, ohne zu sprechen, und notiere die Wörter, die du nicht kennst.
- Beginne mit 0,75-facher Geschwindigkeit, sprich Satz für Satz nach und wechsle zur normalen Geschwindigkeit, sobald es leichtfällt.
- Nimm dich auf und vergleiche mit dem Original; achte dabei auf Wörter wie experiment, whoa, variable.
Grammatik in diesem Video
Die Strukturen, die der Sprecher am häufigsten verwendet, mit den genauen Worten aus dem Video:
| Struktur | Im Video |
|---|---|
| Passiv be + Partizip Perfekt – wichtig ist, was geschieht, nicht wer es tut | can be easily done · was allowed · are made |
| Present Perfect have/has + Partizip Perfekt – eine vergangene Handlung, die jetzt noch wichtig ist | have bonded · haven't tried |
| Relativsätze who / which + Satz – eine Zusatzinformation über eine Person oder Sache | reaction, which means · iodide, which is |
Was ist die Shadowing-Technik?
Shadowing ist eine wissenschaftlich fundierte Sprachlerntechnik, die ursprünglich für die professionelle Dolmetscherausbildung entwickelt und durch den Polyglotten Dr. Alexander Arguelles populär gemacht wurde. Die Methode ist einfach aber wirkungsvoll: Du hörst englisches Audio von Muttersprachlern und wiederholst es sofort laut — wie ein Schatten, der dem Sprecher mit nur 1–2 Sekunden Verzögerung folgt. Anders als passives Hören oder Grammatikübungen zwingt Shadowing dein Gehirn und deine Mundmuskulatur, gleichzeitig echte Sprachmuster zu verarbeiten und zu reproduzieren. Studien zeigen, dass es Aussprachegenauigkeit, Intonation, Rhythmus, verbundene Sprache, Hörverständnis und Sprechflüssigkeit signifikant verbessert — was es zu einer der effektivsten Methoden für die IELTS Speaking-Vorbereitung und reale englische Kommunikation macht.