Changes in matter

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Subido el 24 de mayo de 2020 por Ana R.

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Hello, everyone. It's a great day today. Are you going out? Good. First, the other day, 00:00:00

we studied matter that comes in three states, right? Solid and liquid and gas. Okay, we 00:00:13

have also studied the properties of material. If it's waterproof, like plastic, right? If I put 00:00:27

water in here, my hand won't be wet, yes? We sew metal, right? Metal. And we sew fabric that was 00:00:39

soft and we saw glass, which is transparent for you to see. Okay, today we're going to see 00:00:58

the types of changes we can make to matter. Okay, I'm going to take this, an elastic band. 00:01:11

Okay? An elastic band is elastic, right? I stretch it, I've changed the shape, right? 00:01:25

He cambiado su forma. I've changed its shape. But it's still an elastic band. 00:01:40

And I can stretch it, and stretch it, and stretch it, as many times as I wish. 00:01:48

Okay. Sorry about that. Okay. Another type of elastic band. I stretch it. Okay. And it's still an elastic band. All right. Now, here we have a sponge. Can I stretch a sponge? 00:01:57

now a sponge is not plastic a sponge is absorbent you remember that but it sucks 00:02:21

the water okay let's see what type of change can I make to this I can put it 00:02:32

in my hand, okay, I've squeezed it, okay, squeeze, esdrujar, squeeze, okay, you can 00:02:40

also squeeze an orange to make orange squash, right, you can make orange juice, okay, so 00:02:55

squeeze, stretch, okay? 00:03:09

I change the shape 00:03:17

of matter, but I don't change 00:03:19

the properties of matter, right? 00:03:24

The sponge is still absorbent. 00:03:28

The elastic band is still elastic, 00:03:32

okay? A cloth 00:03:36

What is a cloth made of? It's made of fabric, right? 00:03:40

Cotton, wool or petroleum. It's soft, okay? It's soft. 00:03:48

What happens if I fold it and fold it and fold it and fold it? 00:03:57

I have changed its shape, but I haven't changed its property, its soft, okay? 00:04:09

More changes. 00:04:23

Here I have a piece of paper, okay? 00:04:29

A piece of paper. 00:04:36

I can hold it. Is it still paper? Yes. I can cut it. Still paper, right? I still have paper, okay? 00:04:37

it has not changed its properties. Okay? This ruler is made of plastic. Remember 00:04:59

that we studied that plastic could be rigid, right? Like this. Or it could be 00:05:15

it could be flexible like this one you can bend a ruler okay you can bend it 00:05:28

you can bend your arm you bend your arm you bend your fingers right you bend 00:05:38

your neck right but your neck it's still your neck your fingers they're still your fingers 00:05:51

and your arms still your arms okay maybe bone and muscle and skin and blood okay still it right okay 00:06:00

What's this, okay? It's a piece of wood, okay? What happens if I stretch it? Still the same, right? Still wood. 00:06:21

What happens if I fly heat? 00:06:41

Okay? 00:06:52

Don't do this at home. 00:06:58

Words, as you can see, it has disappeared. 00:07:12

It has turned to ashes. 00:07:21

Okay? 00:07:30

Okay, so is this wood? Is this wood? No, no. We have another type of substance. We have new matter with new properties. 00:07:32

Okay, so when we apply heat, sometimes we have a permanent change. 00:07:50

We can't turn it back, right? 00:08:03

We cannot turn it back. 00:08:07

When you cut paper, you cannot turn it back. 00:08:10

But it is still paper. 00:08:16

What happens when you take an ice cube, un cubito de agua, and you leave it in a glass? 00:08:18

It melts and turns to liquid, right? 00:08:31

Okay. 00:08:37

Have we changed the shape? 00:08:39

Yes. 00:08:42

Have we changed the matter? 00:08:43

No. Remember, when we apply heat, for example, butter. Butter comes in a solid stack, right? 00:08:46

If you leave it outside, it will become liquid. If you cool it again, saline-free ice, the 00:09:06

normal, you will have solid butter again. Now, take an egg or tell your mom to take 00:09:17

an egg. Crack it open. Okay. Put it in a frying pan. Cook it. You have a fried egg, 00:09:30

right? It has turned from liquid raw egg to cooked solid egg. If we cool it, will it be liquid again? 00:09:43

I don't think so, right? That is a permanent change, but still an egg. Let's take the paper, 00:10:03

okay what happens if i burn the paper is it still paper despite now it has disappeared and we cannot 00:10:21

turn it back okay so with this two things don't play with this this is not 00:10:50

a toy okay no if you want to play with it or if you want to make experiments 00:11:07

ask your dad or ask your mom to do it for you okay don't play with fire we can 00:11:15

have changes where you change the shape okay you cut it you change the shape you 00:11:26

you fold it, you change the shape. You bend it, you change the shape. You stretch it, 00:11:40

you change the shape. You fold it, you change the shape. You squeeze it, and you change 00:11:54

shape, okay? But you don't change its properties, okay? You burn it and you turn it into a new 00:12:11

substance with new properties, okay? One more time. Cut, fold, squeeze, stretch, bend, okay? 00:12:30

They change the shape, but they don't change the matter. 00:13:05

Heat or fire can change matter permanently, okay? 00:13:17

We cannot undo that. 00:13:27

El fuego, el calor, puede cambiar las cosas de forma temporal, como en el cubito de hielo que se vuelve agua, o puede propiciar cambios permanentes, como por ejemplo, cuando quemas madera. 00:13:30

Ya no tienes madera, tienes una sustancia nueva. 00:13:50

Okay, now do your exercises, okay? 00:13:54