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Physical and chemical changes _ theory
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Hello everyone! Okay, today we are going to talk about physical and chemical
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changes. Remember last day we were talking about the change of states from
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gas to liquid, from liquid to solid and the way back? Today is different. We have
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to distinguish between these two things and it's very simple. I am going to use
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these two pieces of paper. This is normal paper. If I just make a ball with it, this is still paper, same
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properties. Okay? So this means that is a physical change. Just change the physical
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same aspect, but the properties are the same. If I just break here, many pieces. There's
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too many neurons. This is still paper, same properties. This is a physical change. But
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So what happens if I take one of these pieces and a lighter, don't do this at home, remember,
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just with your parents, and you burn it.
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You can see how it burns, the smoke, and the dust.
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Can you see here?
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This is not a physical change, this is a chemical.
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That means that the dust is not paper anymore, the properties are different.
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So when we burn it, this part of it becomes another thing, okay?
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Dust with other properties different from the paper.
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One of the characteristics of the physical change is it cannot be undone.
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So the dust cannot be paper again, okay?
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Let's go with another example.
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Here I have a glass with a piece of ice, okay?
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If we go to the microwave, okay, we put the ice in just for some seconds, okay let's see,
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25.
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Okay, what do you think?
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What do you think we are going to find here?
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Of course, as you know, we have water and vapor too, you can see it.
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okay now here is my question
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this change what do you think it's physical or chemical change
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being that as we said in the chemical the property changed and the physical they don't change
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and in the chemical they cannot be undone
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and with the physical we can do it in the other way. So that means that this is physical change.
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This is a physical change because the water, even if it's in another state, it's still water. The
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properties are the same. And if we put it in the fridge after maybe an hour, hour and a half,
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or two hours we will get ice again okay this is the main difference I hope you
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have understood this you have two more videos please watch them please and if
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you have any questions just send me an email okay bye bye
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- Idioma/s:
- Autor/es:
- Julia Ramallo Cuesta
- Subido por:
- Julia R.
- Licencia:
- Dominio público
- Visualizaciones:
- 90
- Fecha:
- 10 de mayo de 2020 - 18:16
- Visibilidad:
- Público
- Centro:
- CP INF-PRI EUGENIO MARIA DE HOSTOS
- Duración:
- 04′ 41″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 854x480 píxeles
- Tamaño:
- 137.89 MBytes
